3255 lines
92 KiB
C
3255 lines
92 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VMware VMCI Driver
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*
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* Copyright (C) 2012 VMware, Inc. All rights reserved.
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*/
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#include <linux/vmw_vmci_defs.h>
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#include <linux/vmw_vmci_api.h>
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#include <linux/highmem.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/pagemap.h>
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/uio.h>
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#include <linux/wait.h>
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#include <linux/vmalloc.h>
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#include <linux/skbuff.h>
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#include "vmci_handle_array.h"
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#include "vmci_queue_pair.h"
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#include "vmci_datagram.h"
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#include "vmci_resource.h"
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#include "vmci_context.h"
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#include "vmci_driver.h"
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#include "vmci_event.h"
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#include "vmci_route.h"
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/*
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* In the following, we will distinguish between two kinds of VMX processes -
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* the ones with versions lower than VMCI_VERSION_NOVMVM that use specialized
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* VMCI page files in the VMX and supporting VM to VM communication and the
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* newer ones that use the guest memory directly. We will in the following
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* refer to the older VMX versions as old-style VMX'en, and the newer ones as
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* new-style VMX'en.
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*
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* The state transition datagram is as follows (the VMCIQPB_ prefix has been
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* removed for readability) - see below for more details on the transtions:
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*
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* -------------- NEW -------------
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* | |
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* \_/ \_/
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* CREATED_NO_MEM <-----------------> CREATED_MEM
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* | | |
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* | o-----------------------o |
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* | | |
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* \_/ \_/ \_/
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* ATTACHED_NO_MEM <----------------> ATTACHED_MEM
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* | | |
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* | o----------------------o |
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* | | |
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* \_/ \_/ \_/
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* SHUTDOWN_NO_MEM <----------------> SHUTDOWN_MEM
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* | |
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* | |
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* -------------> gone <-------------
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*
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* In more detail. When a VMCI queue pair is first created, it will be in the
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* VMCIQPB_NEW state. It will then move into one of the following states:
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*
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* - VMCIQPB_CREATED_NO_MEM: this state indicates that either:
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*
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* - the created was performed by a host endpoint, in which case there is
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* no backing memory yet.
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*
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* - the create was initiated by an old-style VMX, that uses
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* vmci_qp_broker_set_page_store to specify the UVAs of the queue pair at
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* a later point in time. This state can be distinguished from the one
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* above by the context ID of the creator. A host side is not allowed to
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* attach until the page store has been set.
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*
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* - VMCIQPB_CREATED_MEM: this state is the result when the queue pair
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* is created by a VMX using the queue pair device backend that
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* sets the UVAs of the queue pair immediately and stores the
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* information for later attachers. At this point, it is ready for
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* the host side to attach to it.
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*
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* Once the queue pair is in one of the created states (with the exception of
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* the case mentioned for older VMX'en above), it is possible to attach to the
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* queue pair. Again we have two new states possible:
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*
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* - VMCIQPB_ATTACHED_MEM: this state can be reached through the following
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* paths:
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*
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* - from VMCIQPB_CREATED_NO_MEM when a new-style VMX allocates a queue
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* pair, and attaches to a queue pair previously created by the host side.
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*
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* - from VMCIQPB_CREATED_MEM when the host side attaches to a queue pair
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* already created by a guest.
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*
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* - from VMCIQPB_ATTACHED_NO_MEM, when an old-style VMX calls
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* vmci_qp_broker_set_page_store (see below).
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*
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* - VMCIQPB_ATTACHED_NO_MEM: If the queue pair already was in the
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* VMCIQPB_CREATED_NO_MEM due to a host side create, an old-style VMX will
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* bring the queue pair into this state. Once vmci_qp_broker_set_page_store
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* is called to register the user memory, the VMCIQPB_ATTACH_MEM state
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* will be entered.
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*
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* From the attached queue pair, the queue pair can enter the shutdown states
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* when either side of the queue pair detaches. If the guest side detaches
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* first, the queue pair will enter the VMCIQPB_SHUTDOWN_NO_MEM state, where
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* the content of the queue pair will no longer be available. If the host
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* side detaches first, the queue pair will either enter the
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* VMCIQPB_SHUTDOWN_MEM, if the guest memory is currently mapped, or
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* VMCIQPB_SHUTDOWN_NO_MEM, if the guest memory is not mapped
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* (e.g., the host detaches while a guest is stunned).
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*
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* New-style VMX'en will also unmap guest memory, if the guest is
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* quiesced, e.g., during a snapshot operation. In that case, the guest
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* memory will no longer be available, and the queue pair will transition from
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* *_MEM state to a *_NO_MEM state. The VMX may later map the memory once more,
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* in which case the queue pair will transition from the *_NO_MEM state at that
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* point back to the *_MEM state. Note that the *_NO_MEM state may have changed,
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* since the peer may have either attached or detached in the meantime. The
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* values are laid out such that ++ on a state will move from a *_NO_MEM to a
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* *_MEM state, and vice versa.
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*/
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/* The Kernel specific component of the struct vmci_queue structure. */
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struct vmci_queue_kern_if {
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struct mutex __mutex; /* Protects the queue. */
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struct mutex *mutex; /* Shared by producer and consumer queues. */
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size_t num_pages; /* Number of pages incl. header. */
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bool host; /* Host or guest? */
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union {
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struct {
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dma_addr_t *pas;
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void **vas;
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} g; /* Used by the guest. */
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struct {
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struct page **page;
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struct page **header_page;
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} h; /* Used by the host. */
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} u;
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};
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/*
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* This structure is opaque to the clients.
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*/
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struct vmci_qp {
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struct vmci_handle handle;
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struct vmci_queue *produce_q;
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struct vmci_queue *consume_q;
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u64 produce_q_size;
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u64 consume_q_size;
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u32 peer;
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u32 flags;
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u32 priv_flags;
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bool guest_endpoint;
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unsigned int blocked;
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unsigned int generation;
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wait_queue_head_t event;
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};
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enum qp_broker_state {
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VMCIQPB_NEW,
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VMCIQPB_CREATED_NO_MEM,
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VMCIQPB_CREATED_MEM,
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VMCIQPB_ATTACHED_NO_MEM,
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VMCIQPB_ATTACHED_MEM,
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VMCIQPB_SHUTDOWN_NO_MEM,
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VMCIQPB_SHUTDOWN_MEM,
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VMCIQPB_GONE
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};
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#define QPBROKERSTATE_HAS_MEM(_qpb) (_qpb->state == VMCIQPB_CREATED_MEM || \
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_qpb->state == VMCIQPB_ATTACHED_MEM || \
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_qpb->state == VMCIQPB_SHUTDOWN_MEM)
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/*
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* In the queue pair broker, we always use the guest point of view for
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* the produce and consume queue values and references, e.g., the
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* produce queue size stored is the guests produce queue size. The
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* host endpoint will need to swap these around. The only exception is
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* the local queue pairs on the host, in which case the host endpoint
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* that creates the queue pair will have the right orientation, and
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* the attaching host endpoint will need to swap.
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*/
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struct qp_entry {
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struct list_head list_item;
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struct vmci_handle handle;
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u32 peer;
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u32 flags;
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u64 produce_size;
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u64 consume_size;
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u32 ref_count;
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};
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struct qp_broker_entry {
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struct vmci_resource resource;
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struct qp_entry qp;
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u32 create_id;
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u32 attach_id;
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enum qp_broker_state state;
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bool require_trusted_attach;
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bool created_by_trusted;
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bool vmci_page_files; /* Created by VMX using VMCI page files */
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struct vmci_queue *produce_q;
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struct vmci_queue *consume_q;
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struct vmci_queue_header saved_produce_q;
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struct vmci_queue_header saved_consume_q;
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vmci_event_release_cb wakeup_cb;
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void *client_data;
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void *local_mem; /* Kernel memory for local queue pair */
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};
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struct qp_guest_endpoint {
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struct vmci_resource resource;
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struct qp_entry qp;
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u64 num_ppns;
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void *produce_q;
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void *consume_q;
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struct ppn_set ppn_set;
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};
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struct qp_list {
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struct list_head head;
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struct mutex mutex; /* Protect queue list. */
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};
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static struct qp_list qp_broker_list = {
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.head = LIST_HEAD_INIT(qp_broker_list.head),
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.mutex = __MUTEX_INITIALIZER(qp_broker_list.mutex),
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};
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static struct qp_list qp_guest_endpoints = {
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.head = LIST_HEAD_INIT(qp_guest_endpoints.head),
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.mutex = __MUTEX_INITIALIZER(qp_guest_endpoints.mutex),
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};
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#define INVALID_VMCI_GUEST_MEM_ID 0
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#define QPE_NUM_PAGES(_QPE) ((u32) \
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(DIV_ROUND_UP(_QPE.produce_size, PAGE_SIZE) + \
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DIV_ROUND_UP(_QPE.consume_size, PAGE_SIZE) + 2))
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/*
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* Frees kernel VA space for a given queue and its queue header, and
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* frees physical data pages.
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*/
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static void qp_free_queue(void *q, u64 size)
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{
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struct vmci_queue *queue = q;
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if (queue) {
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u64 i;
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/* Given size does not include header, so add in a page here. */
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for (i = 0; i < DIV_ROUND_UP(size, PAGE_SIZE) + 1; i++) {
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dma_free_coherent(&vmci_pdev->dev, PAGE_SIZE,
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queue->kernel_if->u.g.vas[i],
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queue->kernel_if->u.g.pas[i]);
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}
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vfree(queue);
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}
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}
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/*
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* Allocates kernel queue pages of specified size with IOMMU mappings,
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* plus space for the queue structure/kernel interface and the queue
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* header.
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*/
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static void *qp_alloc_queue(u64 size, u32 flags)
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{
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u64 i;
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struct vmci_queue *queue;
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size_t pas_size;
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size_t vas_size;
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size_t queue_size = sizeof(*queue) + sizeof(*queue->kernel_if);
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u64 num_pages;
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if (size > SIZE_MAX - PAGE_SIZE)
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return NULL;
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num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1;
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if (num_pages >
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(SIZE_MAX - queue_size) /
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(sizeof(*queue->kernel_if->u.g.pas) +
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sizeof(*queue->kernel_if->u.g.vas)))
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return NULL;
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pas_size = num_pages * sizeof(*queue->kernel_if->u.g.pas);
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vas_size = num_pages * sizeof(*queue->kernel_if->u.g.vas);
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queue_size += pas_size + vas_size;
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queue = vmalloc(queue_size);
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if (!queue)
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return NULL;
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queue->q_header = NULL;
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queue->saved_header = NULL;
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queue->kernel_if = (struct vmci_queue_kern_if *)(queue + 1);
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queue->kernel_if->mutex = NULL;
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queue->kernel_if->num_pages = num_pages;
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queue->kernel_if->u.g.pas = (dma_addr_t *)(queue->kernel_if + 1);
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queue->kernel_if->u.g.vas =
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(void **)((u8 *)queue->kernel_if->u.g.pas + pas_size);
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queue->kernel_if->host = false;
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for (i = 0; i < num_pages; i++) {
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queue->kernel_if->u.g.vas[i] =
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dma_alloc_coherent(&vmci_pdev->dev, PAGE_SIZE,
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&queue->kernel_if->u.g.pas[i],
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GFP_KERNEL);
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if (!queue->kernel_if->u.g.vas[i]) {
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/* Size excl. the header. */
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qp_free_queue(queue, i * PAGE_SIZE);
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return NULL;
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}
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}
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/* Queue header is the first page. */
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queue->q_header = queue->kernel_if->u.g.vas[0];
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return queue;
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}
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/*
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* Copies from a given buffer or iovector to a VMCI Queue. Uses
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* kmap()/kunmap() to dynamically map/unmap required portions of the queue
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* by traversing the offset -> page translation structure for the queue.
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* Assumes that offset + size does not wrap around in the queue.
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*/
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static int qp_memcpy_to_queue_iter(struct vmci_queue *queue,
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u64 queue_offset,
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struct iov_iter *from,
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size_t size)
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{
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struct vmci_queue_kern_if *kernel_if = queue->kernel_if;
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size_t bytes_copied = 0;
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while (bytes_copied < size) {
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const u64 page_index =
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(queue_offset + bytes_copied) / PAGE_SIZE;
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const size_t page_offset =
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(queue_offset + bytes_copied) & (PAGE_SIZE - 1);
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void *va;
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size_t to_copy;
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if (kernel_if->host)
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va = kmap(kernel_if->u.h.page[page_index]);
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else
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va = kernel_if->u.g.vas[page_index + 1];
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/* Skip header. */
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if (size - bytes_copied > PAGE_SIZE - page_offset)
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/* Enough payload to fill up from this page. */
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to_copy = PAGE_SIZE - page_offset;
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else
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to_copy = size - bytes_copied;
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if (!copy_from_iter_full((u8 *)va + page_offset, to_copy,
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from)) {
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if (kernel_if->host)
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kunmap(kernel_if->u.h.page[page_index]);
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return VMCI_ERROR_INVALID_ARGS;
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}
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bytes_copied += to_copy;
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if (kernel_if->host)
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kunmap(kernel_if->u.h.page[page_index]);
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}
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return VMCI_SUCCESS;
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}
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/*
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* Copies to a given buffer or iovector from a VMCI Queue. Uses
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* kmap()/kunmap() to dynamically map/unmap required portions of the queue
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* by traversing the offset -> page translation structure for the queue.
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* Assumes that offset + size does not wrap around in the queue.
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*/
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static int qp_memcpy_from_queue_iter(struct iov_iter *to,
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const struct vmci_queue *queue,
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u64 queue_offset, size_t size)
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{
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struct vmci_queue_kern_if *kernel_if = queue->kernel_if;
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size_t bytes_copied = 0;
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while (bytes_copied < size) {
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const u64 page_index =
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(queue_offset + bytes_copied) / PAGE_SIZE;
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const size_t page_offset =
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(queue_offset + bytes_copied) & (PAGE_SIZE - 1);
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void *va;
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size_t to_copy;
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int err;
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if (kernel_if->host)
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va = kmap(kernel_if->u.h.page[page_index]);
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else
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va = kernel_if->u.g.vas[page_index + 1];
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/* Skip header. */
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if (size - bytes_copied > PAGE_SIZE - page_offset)
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/* Enough payload to fill up this page. */
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to_copy = PAGE_SIZE - page_offset;
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else
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to_copy = size - bytes_copied;
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err = copy_to_iter((u8 *)va + page_offset, to_copy, to);
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if (err != to_copy) {
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if (kernel_if->host)
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kunmap(kernel_if->u.h.page[page_index]);
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return VMCI_ERROR_INVALID_ARGS;
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}
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bytes_copied += to_copy;
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if (kernel_if->host)
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kunmap(kernel_if->u.h.page[page_index]);
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}
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return VMCI_SUCCESS;
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}
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/*
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* Allocates two list of PPNs --- one for the pages in the produce queue,
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* and the other for the pages in the consume queue. Intializes the list
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* of PPNs with the page frame numbers of the KVA for the two queues (and
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* the queue headers).
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*/
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static int qp_alloc_ppn_set(void *prod_q,
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u64 num_produce_pages,
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void *cons_q,
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u64 num_consume_pages, struct ppn_set *ppn_set)
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{
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u64 *produce_ppns;
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u64 *consume_ppns;
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struct vmci_queue *produce_q = prod_q;
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struct vmci_queue *consume_q = cons_q;
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u64 i;
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if (!produce_q || !num_produce_pages || !consume_q ||
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!num_consume_pages || !ppn_set)
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return VMCI_ERROR_INVALID_ARGS;
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if (ppn_set->initialized)
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return VMCI_ERROR_ALREADY_EXISTS;
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produce_ppns =
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kmalloc_array(num_produce_pages, sizeof(*produce_ppns),
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GFP_KERNEL);
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if (!produce_ppns)
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return VMCI_ERROR_NO_MEM;
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consume_ppns =
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kmalloc_array(num_consume_pages, sizeof(*consume_ppns),
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GFP_KERNEL);
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if (!consume_ppns) {
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kfree(produce_ppns);
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return VMCI_ERROR_NO_MEM;
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}
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for (i = 0; i < num_produce_pages; i++)
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produce_ppns[i] =
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produce_q->kernel_if->u.g.pas[i] >> PAGE_SHIFT;
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for (i = 0; i < num_consume_pages; i++)
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consume_ppns[i] =
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consume_q->kernel_if->u.g.pas[i] >> PAGE_SHIFT;
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ppn_set->num_produce_pages = num_produce_pages;
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ppn_set->num_consume_pages = num_consume_pages;
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ppn_set->produce_ppns = produce_ppns;
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ppn_set->consume_ppns = consume_ppns;
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ppn_set->initialized = true;
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return VMCI_SUCCESS;
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}
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/*
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* Frees the two list of PPNs for a queue pair.
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*/
|
|
static void qp_free_ppn_set(struct ppn_set *ppn_set)
|
|
{
|
|
if (ppn_set->initialized) {
|
|
/* Do not call these functions on NULL inputs. */
|
|
kfree(ppn_set->produce_ppns);
|
|
kfree(ppn_set->consume_ppns);
|
|
}
|
|
memset(ppn_set, 0, sizeof(*ppn_set));
|
|
}
|
|
|
|
/*
|
|
* Populates the list of PPNs in the hypercall structure with the PPNS
|
|
* of the produce queue and the consume queue.
|
|
*/
|
|
static int qp_populate_ppn_set(u8 *call_buf, const struct ppn_set *ppn_set)
|
|
{
|
|
if (vmci_use_ppn64()) {
|
|
memcpy(call_buf, ppn_set->produce_ppns,
|
|
ppn_set->num_produce_pages *
|
|
sizeof(*ppn_set->produce_ppns));
|
|
memcpy(call_buf +
|
|
ppn_set->num_produce_pages *
|
|
sizeof(*ppn_set->produce_ppns),
|
|
ppn_set->consume_ppns,
|
|
ppn_set->num_consume_pages *
|
|
sizeof(*ppn_set->consume_ppns));
|
|
} else {
|
|
int i;
|
|
u32 *ppns = (u32 *) call_buf;
|
|
|
|
for (i = 0; i < ppn_set->num_produce_pages; i++)
|
|
ppns[i] = (u32) ppn_set->produce_ppns[i];
|
|
|
|
ppns = &ppns[ppn_set->num_produce_pages];
|
|
|
|
for (i = 0; i < ppn_set->num_consume_pages; i++)
|
|
ppns[i] = (u32) ppn_set->consume_ppns[i];
|
|
}
|
|
|
|
return VMCI_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Allocates kernel VA space of specified size plus space for the queue
|
|
* and kernel interface. This is different from the guest queue allocator,
|
|
* because we do not allocate our own queue header/data pages here but
|
|
* share those of the guest.
|
|
*/
|
|
static struct vmci_queue *qp_host_alloc_queue(u64 size)
|
|
{
|
|
struct vmci_queue *queue;
|
|
size_t queue_page_size;
|
|
u64 num_pages;
|
|
const size_t queue_size = sizeof(*queue) + sizeof(*(queue->kernel_if));
|
|
|
|
if (size > SIZE_MAX - PAGE_SIZE)
|
|
return NULL;
|
|
num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1;
|
|
if (num_pages > (SIZE_MAX - queue_size) /
|
|
sizeof(*queue->kernel_if->u.h.page))
|
|
return NULL;
|
|
|
|
queue_page_size = num_pages * sizeof(*queue->kernel_if->u.h.page);
|
|
|
|
queue = kzalloc(queue_size + queue_page_size, GFP_KERNEL);
|
|
if (queue) {
|
|
queue->q_header = NULL;
|
|
queue->saved_header = NULL;
|
|
queue->kernel_if = (struct vmci_queue_kern_if *)(queue + 1);
|
|
queue->kernel_if->host = true;
|
|
queue->kernel_if->mutex = NULL;
|
|
queue->kernel_if->num_pages = num_pages;
|
|
queue->kernel_if->u.h.header_page =
|
|
(struct page **)((u8 *)queue + queue_size);
|
|
queue->kernel_if->u.h.page =
|
|
&queue->kernel_if->u.h.header_page[1];
|
|
}
|
|
|
|
return queue;
|
|
}
|
|
|
|
/*
|
|
* Frees kernel memory for a given queue (header plus translation
|
|
* structure).
|
|
*/
|
|
static void qp_host_free_queue(struct vmci_queue *queue, u64 queue_size)
|
|
{
|
|
kfree(queue);
|
|
}
|
|
|
|
/*
|
|
* Initialize the mutex for the pair of queues. This mutex is used to
|
|
* protect the q_header and the buffer from changing out from under any
|
|
* users of either queue. Of course, it's only any good if the mutexes
|
|
* are actually acquired. Queue structure must lie on non-paged memory
|
|
* or we cannot guarantee access to the mutex.
|
|
*/
|
|
static void qp_init_queue_mutex(struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q)
|
|
{
|
|
/*
|
|
* Only the host queue has shared state - the guest queues do not
|
|
* need to synchronize access using a queue mutex.
|
|
*/
|
|
|
|
if (produce_q->kernel_if->host) {
|
|
produce_q->kernel_if->mutex = &produce_q->kernel_if->__mutex;
|
|
consume_q->kernel_if->mutex = &produce_q->kernel_if->__mutex;
|
|
mutex_init(produce_q->kernel_if->mutex);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Cleans up the mutex for the pair of queues.
|
|
*/
|
|
static void qp_cleanup_queue_mutex(struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q)
|
|
{
|
|
if (produce_q->kernel_if->host) {
|
|
produce_q->kernel_if->mutex = NULL;
|
|
consume_q->kernel_if->mutex = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Acquire the mutex for the queue. Note that the produce_q and
|
|
* the consume_q share a mutex. So, only one of the two need to
|
|
* be passed in to this routine. Either will work just fine.
|
|
*/
|
|
static void qp_acquire_queue_mutex(struct vmci_queue *queue)
|
|
{
|
|
if (queue->kernel_if->host)
|
|
mutex_lock(queue->kernel_if->mutex);
|
|
}
|
|
|
|
/*
|
|
* Release the mutex for the queue. Note that the produce_q and
|
|
* the consume_q share a mutex. So, only one of the two need to
|
|
* be passed in to this routine. Either will work just fine.
|
|
*/
|
|
static void qp_release_queue_mutex(struct vmci_queue *queue)
|
|
{
|
|
if (queue->kernel_if->host)
|
|
mutex_unlock(queue->kernel_if->mutex);
|
|
}
|
|
|
|
/*
|
|
* Helper function to release pages in the PageStoreAttachInfo
|
|
* previously obtained using get_user_pages.
|
|
*/
|
|
static void qp_release_pages(struct page **pages,
|
|
u64 num_pages, bool dirty)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
if (dirty)
|
|
set_page_dirty(pages[i]);
|
|
|
|
put_page(pages[i]);
|
|
pages[i] = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lock the user pages referenced by the {produce,consume}Buffer
|
|
* struct into memory and populate the {produce,consume}Pages
|
|
* arrays in the attach structure with them.
|
|
*/
|
|
static int qp_host_get_user_memory(u64 produce_uva,
|
|
u64 consume_uva,
|
|
struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q)
|
|
{
|
|
int retval;
|
|
int err = VMCI_SUCCESS;
|
|
|
|
retval = get_user_pages_fast((uintptr_t) produce_uva,
|
|
produce_q->kernel_if->num_pages,
|
|
FOLL_WRITE,
|
|
produce_q->kernel_if->u.h.header_page);
|
|
if (retval < (int)produce_q->kernel_if->num_pages) {
|
|
pr_debug("get_user_pages_fast(produce) failed (retval=%d)",
|
|
retval);
|
|
qp_release_pages(produce_q->kernel_if->u.h.header_page,
|
|
retval, false);
|
|
err = VMCI_ERROR_NO_MEM;
|
|
goto out;
|
|
}
|
|
|
|
retval = get_user_pages_fast((uintptr_t) consume_uva,
|
|
consume_q->kernel_if->num_pages,
|
|
FOLL_WRITE,
|
|
consume_q->kernel_if->u.h.header_page);
|
|
if (retval < (int)consume_q->kernel_if->num_pages) {
|
|
pr_debug("get_user_pages_fast(consume) failed (retval=%d)",
|
|
retval);
|
|
qp_release_pages(consume_q->kernel_if->u.h.header_page,
|
|
retval, false);
|
|
qp_release_pages(produce_q->kernel_if->u.h.header_page,
|
|
produce_q->kernel_if->num_pages, false);
|
|
err = VMCI_ERROR_NO_MEM;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Registers the specification of the user pages used for backing a queue
|
|
* pair. Enough information to map in pages is stored in the OS specific
|
|
* part of the struct vmci_queue structure.
|
|
*/
|
|
static int qp_host_register_user_memory(struct vmci_qp_page_store *page_store,
|
|
struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q)
|
|
{
|
|
u64 produce_uva;
|
|
u64 consume_uva;
|
|
|
|
/*
|
|
* The new style and the old style mapping only differs in
|
|
* that we either get a single or two UVAs, so we split the
|
|
* single UVA range at the appropriate spot.
|
|
*/
|
|
produce_uva = page_store->pages;
|
|
consume_uva = page_store->pages +
|
|
produce_q->kernel_if->num_pages * PAGE_SIZE;
|
|
return qp_host_get_user_memory(produce_uva, consume_uva, produce_q,
|
|
consume_q);
|
|
}
|
|
|
|
/*
|
|
* Releases and removes the references to user pages stored in the attach
|
|
* struct. Pages are released from the page cache and may become
|
|
* swappable again.
|
|
*/
|
|
static void qp_host_unregister_user_memory(struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q)
|
|
{
|
|
qp_release_pages(produce_q->kernel_if->u.h.header_page,
|
|
produce_q->kernel_if->num_pages, true);
|
|
memset(produce_q->kernel_if->u.h.header_page, 0,
|
|
sizeof(*produce_q->kernel_if->u.h.header_page) *
|
|
produce_q->kernel_if->num_pages);
|
|
qp_release_pages(consume_q->kernel_if->u.h.header_page,
|
|
consume_q->kernel_if->num_pages, true);
|
|
memset(consume_q->kernel_if->u.h.header_page, 0,
|
|
sizeof(*consume_q->kernel_if->u.h.header_page) *
|
|
consume_q->kernel_if->num_pages);
|
|
}
|
|
|
|
/*
|
|
* Once qp_host_register_user_memory has been performed on a
|
|
* queue, the queue pair headers can be mapped into the
|
|
* kernel. Once mapped, they must be unmapped with
|
|
* qp_host_unmap_queues prior to calling
|
|
* qp_host_unregister_user_memory.
|
|
* Pages are pinned.
|
|
*/
|
|
static int qp_host_map_queues(struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q)
|
|
{
|
|
int result;
|
|
|
|
if (!produce_q->q_header || !consume_q->q_header) {
|
|
struct page *headers[2];
|
|
|
|
if (produce_q->q_header != consume_q->q_header)
|
|
return VMCI_ERROR_QUEUEPAIR_MISMATCH;
|
|
|
|
if (produce_q->kernel_if->u.h.header_page == NULL ||
|
|
*produce_q->kernel_if->u.h.header_page == NULL)
|
|
return VMCI_ERROR_UNAVAILABLE;
|
|
|
|
headers[0] = *produce_q->kernel_if->u.h.header_page;
|
|
headers[1] = *consume_q->kernel_if->u.h.header_page;
|
|
|
|
produce_q->q_header = vmap(headers, 2, VM_MAP, PAGE_KERNEL);
|
|
if (produce_q->q_header != NULL) {
|
|
consume_q->q_header =
|
|
(struct vmci_queue_header *)((u8 *)
|
|
produce_q->q_header +
|
|
PAGE_SIZE);
|
|
result = VMCI_SUCCESS;
|
|
} else {
|
|
pr_warn("vmap failed\n");
|
|
result = VMCI_ERROR_NO_MEM;
|
|
}
|
|
} else {
|
|
result = VMCI_SUCCESS;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Unmaps previously mapped queue pair headers from the kernel.
|
|
* Pages are unpinned.
|
|
*/
|
|
static int qp_host_unmap_queues(u32 gid,
|
|
struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q)
|
|
{
|
|
if (produce_q->q_header) {
|
|
if (produce_q->q_header < consume_q->q_header)
|
|
vunmap(produce_q->q_header);
|
|
else
|
|
vunmap(consume_q->q_header);
|
|
|
|
produce_q->q_header = NULL;
|
|
consume_q->q_header = NULL;
|
|
}
|
|
|
|
return VMCI_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Finds the entry in the list corresponding to a given handle. Assumes
|
|
* that the list is locked.
|
|
*/
|
|
static struct qp_entry *qp_list_find(struct qp_list *qp_list,
|
|
struct vmci_handle handle)
|
|
{
|
|
struct qp_entry *entry;
|
|
|
|
if (vmci_handle_is_invalid(handle))
|
|
return NULL;
|
|
|
|
list_for_each_entry(entry, &qp_list->head, list_item) {
|
|
if (vmci_handle_is_equal(entry->handle, handle))
|
|
return entry;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Finds the entry in the list corresponding to a given handle.
|
|
*/
|
|
static struct qp_guest_endpoint *
|
|
qp_guest_handle_to_entry(struct vmci_handle handle)
|
|
{
|
|
struct qp_guest_endpoint *entry;
|
|
struct qp_entry *qp = qp_list_find(&qp_guest_endpoints, handle);
|
|
|
|
entry = qp ? container_of(
|
|
qp, struct qp_guest_endpoint, qp) : NULL;
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* Finds the entry in the list corresponding to a given handle.
|
|
*/
|
|
static struct qp_broker_entry *
|
|
qp_broker_handle_to_entry(struct vmci_handle handle)
|
|
{
|
|
struct qp_broker_entry *entry;
|
|
struct qp_entry *qp = qp_list_find(&qp_broker_list, handle);
|
|
|
|
entry = qp ? container_of(
|
|
qp, struct qp_broker_entry, qp) : NULL;
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* Dispatches a queue pair event message directly into the local event
|
|
* queue.
|
|
*/
|
|
static int qp_notify_peer_local(bool attach, struct vmci_handle handle)
|
|
{
|
|
u32 context_id = vmci_get_context_id();
|
|
struct vmci_event_qp ev;
|
|
|
|
ev.msg.hdr.dst = vmci_make_handle(context_id, VMCI_EVENT_HANDLER);
|
|
ev.msg.hdr.src = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
|
|
VMCI_CONTEXT_RESOURCE_ID);
|
|
ev.msg.hdr.payload_size = sizeof(ev) - sizeof(ev.msg.hdr);
|
|
ev.msg.event_data.event =
|
|
attach ? VMCI_EVENT_QP_PEER_ATTACH : VMCI_EVENT_QP_PEER_DETACH;
|
|
ev.payload.peer_id = context_id;
|
|
ev.payload.handle = handle;
|
|
|
|
return vmci_event_dispatch(&ev.msg.hdr);
|
|
}
|
|
|
|
/*
|
|
* Allocates and initializes a qp_guest_endpoint structure.
|
|
* Allocates a queue_pair rid (and handle) iff the given entry has
|
|
* an invalid handle. 0 through VMCI_RESERVED_RESOURCE_ID_MAX
|
|
* are reserved handles. Assumes that the QP list mutex is held
|
|
* by the caller.
|
|
*/
|
|
static struct qp_guest_endpoint *
|
|
qp_guest_endpoint_create(struct vmci_handle handle,
|
|
u32 peer,
|
|
u32 flags,
|
|
u64 produce_size,
|
|
u64 consume_size,
|
|
void *produce_q,
|
|
void *consume_q)
|
|
{
|
|
int result;
|
|
struct qp_guest_endpoint *entry;
|
|
/* One page each for the queue headers. */
|
|
const u64 num_ppns = DIV_ROUND_UP(produce_size, PAGE_SIZE) +
|
|
DIV_ROUND_UP(consume_size, PAGE_SIZE) + 2;
|
|
|
|
if (vmci_handle_is_invalid(handle)) {
|
|
u32 context_id = vmci_get_context_id();
|
|
|
|
handle = vmci_make_handle(context_id, VMCI_INVALID_ID);
|
|
}
|
|
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
|
if (entry) {
|
|
entry->qp.peer = peer;
|
|
entry->qp.flags = flags;
|
|
entry->qp.produce_size = produce_size;
|
|
entry->qp.consume_size = consume_size;
|
|
entry->qp.ref_count = 0;
|
|
entry->num_ppns = num_ppns;
|
|
entry->produce_q = produce_q;
|
|
entry->consume_q = consume_q;
|
|
INIT_LIST_HEAD(&entry->qp.list_item);
|
|
|
|
/* Add resource obj */
|
|
result = vmci_resource_add(&entry->resource,
|
|
VMCI_RESOURCE_TYPE_QPAIR_GUEST,
|
|
handle);
|
|
entry->qp.handle = vmci_resource_handle(&entry->resource);
|
|
if ((result != VMCI_SUCCESS) ||
|
|
qp_list_find(&qp_guest_endpoints, entry->qp.handle)) {
|
|
pr_warn("Failed to add new resource (handle=0x%x:0x%x), error: %d",
|
|
handle.context, handle.resource, result);
|
|
kfree(entry);
|
|
entry = NULL;
|
|
}
|
|
}
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* Frees a qp_guest_endpoint structure.
|
|
*/
|
|
static void qp_guest_endpoint_destroy(struct qp_guest_endpoint *entry)
|
|
{
|
|
qp_free_ppn_set(&entry->ppn_set);
|
|
qp_cleanup_queue_mutex(entry->produce_q, entry->consume_q);
|
|
qp_free_queue(entry->produce_q, entry->qp.produce_size);
|
|
qp_free_queue(entry->consume_q, entry->qp.consume_size);
|
|
/* Unlink from resource hash table and free callback */
|
|
vmci_resource_remove(&entry->resource);
|
|
|
|
kfree(entry);
|
|
}
|
|
|
|
/*
|
|
* Helper to make a queue_pairAlloc hypercall when the driver is
|
|
* supporting a guest device.
|
|
*/
|
|
static int qp_alloc_hypercall(const struct qp_guest_endpoint *entry)
|
|
{
|
|
struct vmci_qp_alloc_msg *alloc_msg;
|
|
size_t msg_size;
|
|
size_t ppn_size;
|
|
int result;
|
|
|
|
if (!entry || entry->num_ppns <= 2)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
ppn_size = vmci_use_ppn64() ? sizeof(u64) : sizeof(u32);
|
|
msg_size = sizeof(*alloc_msg) +
|
|
(size_t) entry->num_ppns * ppn_size;
|
|
alloc_msg = kmalloc(msg_size, GFP_KERNEL);
|
|
if (!alloc_msg)
|
|
return VMCI_ERROR_NO_MEM;
|
|
|
|
alloc_msg->hdr.dst = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
|
|
VMCI_QUEUEPAIR_ALLOC);
|
|
alloc_msg->hdr.src = VMCI_ANON_SRC_HANDLE;
|
|
alloc_msg->hdr.payload_size = msg_size - VMCI_DG_HEADERSIZE;
|
|
alloc_msg->handle = entry->qp.handle;
|
|
alloc_msg->peer = entry->qp.peer;
|
|
alloc_msg->flags = entry->qp.flags;
|
|
alloc_msg->produce_size = entry->qp.produce_size;
|
|
alloc_msg->consume_size = entry->qp.consume_size;
|
|
alloc_msg->num_ppns = entry->num_ppns;
|
|
|
|
result = qp_populate_ppn_set((u8 *)alloc_msg + sizeof(*alloc_msg),
|
|
&entry->ppn_set);
|
|
if (result == VMCI_SUCCESS)
|
|
result = vmci_send_datagram(&alloc_msg->hdr);
|
|
|
|
kfree(alloc_msg);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Helper to make a queue_pairDetach hypercall when the driver is
|
|
* supporting a guest device.
|
|
*/
|
|
static int qp_detatch_hypercall(struct vmci_handle handle)
|
|
{
|
|
struct vmci_qp_detach_msg detach_msg;
|
|
|
|
detach_msg.hdr.dst = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
|
|
VMCI_QUEUEPAIR_DETACH);
|
|
detach_msg.hdr.src = VMCI_ANON_SRC_HANDLE;
|
|
detach_msg.hdr.payload_size = sizeof(handle);
|
|
detach_msg.handle = handle;
|
|
|
|
return vmci_send_datagram(&detach_msg.hdr);
|
|
}
|
|
|
|
/*
|
|
* Adds the given entry to the list. Assumes that the list is locked.
|
|
*/
|
|
static void qp_list_add_entry(struct qp_list *qp_list, struct qp_entry *entry)
|
|
{
|
|
if (entry)
|
|
list_add(&entry->list_item, &qp_list->head);
|
|
}
|
|
|
|
/*
|
|
* Removes the given entry from the list. Assumes that the list is locked.
|
|
*/
|
|
static void qp_list_remove_entry(struct qp_list *qp_list,
|
|
struct qp_entry *entry)
|
|
{
|
|
if (entry)
|
|
list_del(&entry->list_item);
|
|
}
|
|
|
|
/*
|
|
* Helper for VMCI queue_pair detach interface. Frees the physical
|
|
* pages for the queue pair.
|
|
*/
|
|
static int qp_detatch_guest_work(struct vmci_handle handle)
|
|
{
|
|
int result;
|
|
struct qp_guest_endpoint *entry;
|
|
u32 ref_count = ~0; /* To avoid compiler warning below */
|
|
|
|
mutex_lock(&qp_guest_endpoints.mutex);
|
|
|
|
entry = qp_guest_handle_to_entry(handle);
|
|
if (!entry) {
|
|
mutex_unlock(&qp_guest_endpoints.mutex);
|
|
return VMCI_ERROR_NOT_FOUND;
|
|
}
|
|
|
|
if (entry->qp.flags & VMCI_QPFLAG_LOCAL) {
|
|
result = VMCI_SUCCESS;
|
|
|
|
if (entry->qp.ref_count > 1) {
|
|
result = qp_notify_peer_local(false, handle);
|
|
/*
|
|
* We can fail to notify a local queuepair
|
|
* because we can't allocate. We still want
|
|
* to release the entry if that happens, so
|
|
* don't bail out yet.
|
|
*/
|
|
}
|
|
} else {
|
|
result = qp_detatch_hypercall(handle);
|
|
if (result < VMCI_SUCCESS) {
|
|
/*
|
|
* We failed to notify a non-local queuepair.
|
|
* That other queuepair might still be
|
|
* accessing the shared memory, so don't
|
|
* release the entry yet. It will get cleaned
|
|
* up by VMCIqueue_pair_Exit() if necessary
|
|
* (assuming we are going away, otherwise why
|
|
* did this fail?).
|
|
*/
|
|
|
|
mutex_unlock(&qp_guest_endpoints.mutex);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we get here then we either failed to notify a local queuepair, or
|
|
* we succeeded in all cases. Release the entry if required.
|
|
*/
|
|
|
|
entry->qp.ref_count--;
|
|
if (entry->qp.ref_count == 0)
|
|
qp_list_remove_entry(&qp_guest_endpoints, &entry->qp);
|
|
|
|
/* If we didn't remove the entry, this could change once we unlock. */
|
|
if (entry)
|
|
ref_count = entry->qp.ref_count;
|
|
|
|
mutex_unlock(&qp_guest_endpoints.mutex);
|
|
|
|
if (ref_count == 0)
|
|
qp_guest_endpoint_destroy(entry);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* This functions handles the actual allocation of a VMCI queue
|
|
* pair guest endpoint. Allocates physical pages for the queue
|
|
* pair. It makes OS dependent calls through generic wrappers.
|
|
*/
|
|
static int qp_alloc_guest_work(struct vmci_handle *handle,
|
|
struct vmci_queue **produce_q,
|
|
u64 produce_size,
|
|
struct vmci_queue **consume_q,
|
|
u64 consume_size,
|
|
u32 peer,
|
|
u32 flags,
|
|
u32 priv_flags)
|
|
{
|
|
const u64 num_produce_pages =
|
|
DIV_ROUND_UP(produce_size, PAGE_SIZE) + 1;
|
|
const u64 num_consume_pages =
|
|
DIV_ROUND_UP(consume_size, PAGE_SIZE) + 1;
|
|
void *my_produce_q = NULL;
|
|
void *my_consume_q = NULL;
|
|
int result;
|
|
struct qp_guest_endpoint *queue_pair_entry = NULL;
|
|
|
|
if (priv_flags != VMCI_NO_PRIVILEGE_FLAGS)
|
|
return VMCI_ERROR_NO_ACCESS;
|
|
|
|
mutex_lock(&qp_guest_endpoints.mutex);
|
|
|
|
queue_pair_entry = qp_guest_handle_to_entry(*handle);
|
|
if (queue_pair_entry) {
|
|
if (queue_pair_entry->qp.flags & VMCI_QPFLAG_LOCAL) {
|
|
/* Local attach case. */
|
|
if (queue_pair_entry->qp.ref_count > 1) {
|
|
pr_devel("Error attempting to attach more than once\n");
|
|
result = VMCI_ERROR_UNAVAILABLE;
|
|
goto error_keep_entry;
|
|
}
|
|
|
|
if (queue_pair_entry->qp.produce_size != consume_size ||
|
|
queue_pair_entry->qp.consume_size !=
|
|
produce_size ||
|
|
queue_pair_entry->qp.flags !=
|
|
(flags & ~VMCI_QPFLAG_ATTACH_ONLY)) {
|
|
pr_devel("Error mismatched queue pair in local attach\n");
|
|
result = VMCI_ERROR_QUEUEPAIR_MISMATCH;
|
|
goto error_keep_entry;
|
|
}
|
|
|
|
/*
|
|
* Do a local attach. We swap the consume and
|
|
* produce queues for the attacher and deliver
|
|
* an attach event.
|
|
*/
|
|
result = qp_notify_peer_local(true, *handle);
|
|
if (result < VMCI_SUCCESS)
|
|
goto error_keep_entry;
|
|
|
|
my_produce_q = queue_pair_entry->consume_q;
|
|
my_consume_q = queue_pair_entry->produce_q;
|
|
goto out;
|
|
}
|
|
|
|
result = VMCI_ERROR_ALREADY_EXISTS;
|
|
goto error_keep_entry;
|
|
}
|
|
|
|
my_produce_q = qp_alloc_queue(produce_size, flags);
|
|
if (!my_produce_q) {
|
|
pr_warn("Error allocating pages for produce queue\n");
|
|
result = VMCI_ERROR_NO_MEM;
|
|
goto error;
|
|
}
|
|
|
|
my_consume_q = qp_alloc_queue(consume_size, flags);
|
|
if (!my_consume_q) {
|
|
pr_warn("Error allocating pages for consume queue\n");
|
|
result = VMCI_ERROR_NO_MEM;
|
|
goto error;
|
|
}
|
|
|
|
queue_pair_entry = qp_guest_endpoint_create(*handle, peer, flags,
|
|
produce_size, consume_size,
|
|
my_produce_q, my_consume_q);
|
|
if (!queue_pair_entry) {
|
|
pr_warn("Error allocating memory in %s\n", __func__);
|
|
result = VMCI_ERROR_NO_MEM;
|
|
goto error;
|
|
}
|
|
|
|
result = qp_alloc_ppn_set(my_produce_q, num_produce_pages, my_consume_q,
|
|
num_consume_pages,
|
|
&queue_pair_entry->ppn_set);
|
|
if (result < VMCI_SUCCESS) {
|
|
pr_warn("qp_alloc_ppn_set failed\n");
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* It's only necessary to notify the host if this queue pair will be
|
|
* attached to from another context.
|
|
*/
|
|
if (queue_pair_entry->qp.flags & VMCI_QPFLAG_LOCAL) {
|
|
/* Local create case. */
|
|
u32 context_id = vmci_get_context_id();
|
|
|
|
/*
|
|
* Enforce similar checks on local queue pairs as we
|
|
* do for regular ones. The handle's context must
|
|
* match the creator or attacher context id (here they
|
|
* are both the current context id) and the
|
|
* attach-only flag cannot exist during create. We
|
|
* also ensure specified peer is this context or an
|
|
* invalid one.
|
|
*/
|
|
if (queue_pair_entry->qp.handle.context != context_id ||
|
|
(queue_pair_entry->qp.peer != VMCI_INVALID_ID &&
|
|
queue_pair_entry->qp.peer != context_id)) {
|
|
result = VMCI_ERROR_NO_ACCESS;
|
|
goto error;
|
|
}
|
|
|
|
if (queue_pair_entry->qp.flags & VMCI_QPFLAG_ATTACH_ONLY) {
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto error;
|
|
}
|
|
} else {
|
|
result = qp_alloc_hypercall(queue_pair_entry);
|
|
if (result < VMCI_SUCCESS) {
|
|
pr_warn("qp_alloc_hypercall result = %d\n", result);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
qp_init_queue_mutex((struct vmci_queue *)my_produce_q,
|
|
(struct vmci_queue *)my_consume_q);
|
|
|
|
qp_list_add_entry(&qp_guest_endpoints, &queue_pair_entry->qp);
|
|
|
|
out:
|
|
queue_pair_entry->qp.ref_count++;
|
|
*handle = queue_pair_entry->qp.handle;
|
|
*produce_q = (struct vmci_queue *)my_produce_q;
|
|
*consume_q = (struct vmci_queue *)my_consume_q;
|
|
|
|
/*
|
|
* We should initialize the queue pair header pages on a local
|
|
* queue pair create. For non-local queue pairs, the
|
|
* hypervisor initializes the header pages in the create step.
|
|
*/
|
|
if ((queue_pair_entry->qp.flags & VMCI_QPFLAG_LOCAL) &&
|
|
queue_pair_entry->qp.ref_count == 1) {
|
|
vmci_q_header_init((*produce_q)->q_header, *handle);
|
|
vmci_q_header_init((*consume_q)->q_header, *handle);
|
|
}
|
|
|
|
mutex_unlock(&qp_guest_endpoints.mutex);
|
|
|
|
return VMCI_SUCCESS;
|
|
|
|
error:
|
|
mutex_unlock(&qp_guest_endpoints.mutex);
|
|
if (queue_pair_entry) {
|
|
/* The queues will be freed inside the destroy routine. */
|
|
qp_guest_endpoint_destroy(queue_pair_entry);
|
|
} else {
|
|
qp_free_queue(my_produce_q, produce_size);
|
|
qp_free_queue(my_consume_q, consume_size);
|
|
}
|
|
return result;
|
|
|
|
error_keep_entry:
|
|
/* This path should only be used when an existing entry was found. */
|
|
mutex_unlock(&qp_guest_endpoints.mutex);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* The first endpoint issuing a queue pair allocation will create the state
|
|
* of the queue pair in the queue pair broker.
|
|
*
|
|
* If the creator is a guest, it will associate a VMX virtual address range
|
|
* with the queue pair as specified by the page_store. For compatibility with
|
|
* older VMX'en, that would use a separate step to set the VMX virtual
|
|
* address range, the virtual address range can be registered later using
|
|
* vmci_qp_broker_set_page_store. In that case, a page_store of NULL should be
|
|
* used.
|
|
*
|
|
* If the creator is the host, a page_store of NULL should be used as well,
|
|
* since the host is not able to supply a page store for the queue pair.
|
|
*
|
|
* For older VMX and host callers, the queue pair will be created in the
|
|
* VMCIQPB_CREATED_NO_MEM state, and for current VMX callers, it will be
|
|
* created in VMCOQPB_CREATED_MEM state.
|
|
*/
|
|
static int qp_broker_create(struct vmci_handle handle,
|
|
u32 peer,
|
|
u32 flags,
|
|
u32 priv_flags,
|
|
u64 produce_size,
|
|
u64 consume_size,
|
|
struct vmci_qp_page_store *page_store,
|
|
struct vmci_ctx *context,
|
|
vmci_event_release_cb wakeup_cb,
|
|
void *client_data, struct qp_broker_entry **ent)
|
|
{
|
|
struct qp_broker_entry *entry = NULL;
|
|
const u32 context_id = vmci_ctx_get_id(context);
|
|
bool is_local = flags & VMCI_QPFLAG_LOCAL;
|
|
int result;
|
|
u64 guest_produce_size;
|
|
u64 guest_consume_size;
|
|
|
|
/* Do not create if the caller asked not to. */
|
|
if (flags & VMCI_QPFLAG_ATTACH_ONLY)
|
|
return VMCI_ERROR_NOT_FOUND;
|
|
|
|
/*
|
|
* Creator's context ID should match handle's context ID or the creator
|
|
* must allow the context in handle's context ID as the "peer".
|
|
*/
|
|
if (handle.context != context_id && handle.context != peer)
|
|
return VMCI_ERROR_NO_ACCESS;
|
|
|
|
if (VMCI_CONTEXT_IS_VM(context_id) && VMCI_CONTEXT_IS_VM(peer))
|
|
return VMCI_ERROR_DST_UNREACHABLE;
|
|
|
|
/*
|
|
* Creator's context ID for local queue pairs should match the
|
|
* peer, if a peer is specified.
|
|
*/
|
|
if (is_local && peer != VMCI_INVALID_ID && context_id != peer)
|
|
return VMCI_ERROR_NO_ACCESS;
|
|
|
|
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
|
|
if (!entry)
|
|
return VMCI_ERROR_NO_MEM;
|
|
|
|
if (vmci_ctx_get_id(context) == VMCI_HOST_CONTEXT_ID && !is_local) {
|
|
/*
|
|
* The queue pair broker entry stores values from the guest
|
|
* point of view, so a creating host side endpoint should swap
|
|
* produce and consume values -- unless it is a local queue
|
|
* pair, in which case no swapping is necessary, since the local
|
|
* attacher will swap queues.
|
|
*/
|
|
|
|
guest_produce_size = consume_size;
|
|
guest_consume_size = produce_size;
|
|
} else {
|
|
guest_produce_size = produce_size;
|
|
guest_consume_size = consume_size;
|
|
}
|
|
|
|
entry->qp.handle = handle;
|
|
entry->qp.peer = peer;
|
|
entry->qp.flags = flags;
|
|
entry->qp.produce_size = guest_produce_size;
|
|
entry->qp.consume_size = guest_consume_size;
|
|
entry->qp.ref_count = 1;
|
|
entry->create_id = context_id;
|
|
entry->attach_id = VMCI_INVALID_ID;
|
|
entry->state = VMCIQPB_NEW;
|
|
entry->require_trusted_attach =
|
|
!!(context->priv_flags & VMCI_PRIVILEGE_FLAG_RESTRICTED);
|
|
entry->created_by_trusted =
|
|
!!(priv_flags & VMCI_PRIVILEGE_FLAG_TRUSTED);
|
|
entry->vmci_page_files = false;
|
|
entry->wakeup_cb = wakeup_cb;
|
|
entry->client_data = client_data;
|
|
entry->produce_q = qp_host_alloc_queue(guest_produce_size);
|
|
if (entry->produce_q == NULL) {
|
|
result = VMCI_ERROR_NO_MEM;
|
|
goto error;
|
|
}
|
|
entry->consume_q = qp_host_alloc_queue(guest_consume_size);
|
|
if (entry->consume_q == NULL) {
|
|
result = VMCI_ERROR_NO_MEM;
|
|
goto error;
|
|
}
|
|
|
|
qp_init_queue_mutex(entry->produce_q, entry->consume_q);
|
|
|
|
INIT_LIST_HEAD(&entry->qp.list_item);
|
|
|
|
if (is_local) {
|
|
u8 *tmp;
|
|
|
|
entry->local_mem = kcalloc(QPE_NUM_PAGES(entry->qp),
|
|
PAGE_SIZE, GFP_KERNEL);
|
|
if (entry->local_mem == NULL) {
|
|
result = VMCI_ERROR_NO_MEM;
|
|
goto error;
|
|
}
|
|
entry->state = VMCIQPB_CREATED_MEM;
|
|
entry->produce_q->q_header = entry->local_mem;
|
|
tmp = (u8 *)entry->local_mem + PAGE_SIZE *
|
|
(DIV_ROUND_UP(entry->qp.produce_size, PAGE_SIZE) + 1);
|
|
entry->consume_q->q_header = (struct vmci_queue_header *)tmp;
|
|
} else if (page_store) {
|
|
/*
|
|
* The VMX already initialized the queue pair headers, so no
|
|
* need for the kernel side to do that.
|
|
*/
|
|
result = qp_host_register_user_memory(page_store,
|
|
entry->produce_q,
|
|
entry->consume_q);
|
|
if (result < VMCI_SUCCESS)
|
|
goto error;
|
|
|
|
entry->state = VMCIQPB_CREATED_MEM;
|
|
} else {
|
|
/*
|
|
* A create without a page_store may be either a host
|
|
* side create (in which case we are waiting for the
|
|
* guest side to supply the memory) or an old style
|
|
* queue pair create (in which case we will expect a
|
|
* set page store call as the next step).
|
|
*/
|
|
entry->state = VMCIQPB_CREATED_NO_MEM;
|
|
}
|
|
|
|
qp_list_add_entry(&qp_broker_list, &entry->qp);
|
|
if (ent != NULL)
|
|
*ent = entry;
|
|
|
|
/* Add to resource obj */
|
|
result = vmci_resource_add(&entry->resource,
|
|
VMCI_RESOURCE_TYPE_QPAIR_HOST,
|
|
handle);
|
|
if (result != VMCI_SUCCESS) {
|
|
pr_warn("Failed to add new resource (handle=0x%x:0x%x), error: %d",
|
|
handle.context, handle.resource, result);
|
|
goto error;
|
|
}
|
|
|
|
entry->qp.handle = vmci_resource_handle(&entry->resource);
|
|
if (is_local) {
|
|
vmci_q_header_init(entry->produce_q->q_header,
|
|
entry->qp.handle);
|
|
vmci_q_header_init(entry->consume_q->q_header,
|
|
entry->qp.handle);
|
|
}
|
|
|
|
vmci_ctx_qp_create(context, entry->qp.handle);
|
|
|
|
return VMCI_SUCCESS;
|
|
|
|
error:
|
|
if (entry != NULL) {
|
|
qp_host_free_queue(entry->produce_q, guest_produce_size);
|
|
qp_host_free_queue(entry->consume_q, guest_consume_size);
|
|
kfree(entry);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Enqueues an event datagram to notify the peer VM attached to
|
|
* the given queue pair handle about attach/detach event by the
|
|
* given VM. Returns Payload size of datagram enqueued on
|
|
* success, error code otherwise.
|
|
*/
|
|
static int qp_notify_peer(bool attach,
|
|
struct vmci_handle handle,
|
|
u32 my_id,
|
|
u32 peer_id)
|
|
{
|
|
int rv;
|
|
struct vmci_event_qp ev;
|
|
|
|
if (vmci_handle_is_invalid(handle) || my_id == VMCI_INVALID_ID ||
|
|
peer_id == VMCI_INVALID_ID)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
/*
|
|
* In vmci_ctx_enqueue_datagram() we enforce the upper limit on
|
|
* number of pending events from the hypervisor to a given VM
|
|
* otherwise a rogue VM could do an arbitrary number of attach
|
|
* and detach operations causing memory pressure in the host
|
|
* kernel.
|
|
*/
|
|
|
|
ev.msg.hdr.dst = vmci_make_handle(peer_id, VMCI_EVENT_HANDLER);
|
|
ev.msg.hdr.src = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
|
|
VMCI_CONTEXT_RESOURCE_ID);
|
|
ev.msg.hdr.payload_size = sizeof(ev) - sizeof(ev.msg.hdr);
|
|
ev.msg.event_data.event = attach ?
|
|
VMCI_EVENT_QP_PEER_ATTACH : VMCI_EVENT_QP_PEER_DETACH;
|
|
ev.payload.handle = handle;
|
|
ev.payload.peer_id = my_id;
|
|
|
|
rv = vmci_datagram_dispatch(VMCI_HYPERVISOR_CONTEXT_ID,
|
|
&ev.msg.hdr, false);
|
|
if (rv < VMCI_SUCCESS)
|
|
pr_warn("Failed to enqueue queue_pair %s event datagram for context (ID=0x%x)\n",
|
|
attach ? "ATTACH" : "DETACH", peer_id);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
* The second endpoint issuing a queue pair allocation will attach to
|
|
* the queue pair registered with the queue pair broker.
|
|
*
|
|
* If the attacher is a guest, it will associate a VMX virtual address
|
|
* range with the queue pair as specified by the page_store. At this
|
|
* point, the already attach host endpoint may start using the queue
|
|
* pair, and an attach event is sent to it. For compatibility with
|
|
* older VMX'en, that used a separate step to set the VMX virtual
|
|
* address range, the virtual address range can be registered later
|
|
* using vmci_qp_broker_set_page_store. In that case, a page_store of
|
|
* NULL should be used, and the attach event will be generated once
|
|
* the actual page store has been set.
|
|
*
|
|
* If the attacher is the host, a page_store of NULL should be used as
|
|
* well, since the page store information is already set by the guest.
|
|
*
|
|
* For new VMX and host callers, the queue pair will be moved to the
|
|
* VMCIQPB_ATTACHED_MEM state, and for older VMX callers, it will be
|
|
* moved to the VMCOQPB_ATTACHED_NO_MEM state.
|
|
*/
|
|
static int qp_broker_attach(struct qp_broker_entry *entry,
|
|
u32 peer,
|
|
u32 flags,
|
|
u32 priv_flags,
|
|
u64 produce_size,
|
|
u64 consume_size,
|
|
struct vmci_qp_page_store *page_store,
|
|
struct vmci_ctx *context,
|
|
vmci_event_release_cb wakeup_cb,
|
|
void *client_data,
|
|
struct qp_broker_entry **ent)
|
|
{
|
|
const u32 context_id = vmci_ctx_get_id(context);
|
|
bool is_local = flags & VMCI_QPFLAG_LOCAL;
|
|
int result;
|
|
|
|
if (entry->state != VMCIQPB_CREATED_NO_MEM &&
|
|
entry->state != VMCIQPB_CREATED_MEM)
|
|
return VMCI_ERROR_UNAVAILABLE;
|
|
|
|
if (is_local) {
|
|
if (!(entry->qp.flags & VMCI_QPFLAG_LOCAL) ||
|
|
context_id != entry->create_id) {
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
}
|
|
} else if (context_id == entry->create_id ||
|
|
context_id == entry->attach_id) {
|
|
return VMCI_ERROR_ALREADY_EXISTS;
|
|
}
|
|
|
|
if (VMCI_CONTEXT_IS_VM(context_id) &&
|
|
VMCI_CONTEXT_IS_VM(entry->create_id))
|
|
return VMCI_ERROR_DST_UNREACHABLE;
|
|
|
|
/*
|
|
* If we are attaching from a restricted context then the queuepair
|
|
* must have been created by a trusted endpoint.
|
|
*/
|
|
if ((context->priv_flags & VMCI_PRIVILEGE_FLAG_RESTRICTED) &&
|
|
!entry->created_by_trusted)
|
|
return VMCI_ERROR_NO_ACCESS;
|
|
|
|
/*
|
|
* If we are attaching to a queuepair that was created by a restricted
|
|
* context then we must be trusted.
|
|
*/
|
|
if (entry->require_trusted_attach &&
|
|
(!(priv_flags & VMCI_PRIVILEGE_FLAG_TRUSTED)))
|
|
return VMCI_ERROR_NO_ACCESS;
|
|
|
|
/*
|
|
* If the creator specifies VMCI_INVALID_ID in "peer" field, access
|
|
* control check is not performed.
|
|
*/
|
|
if (entry->qp.peer != VMCI_INVALID_ID && entry->qp.peer != context_id)
|
|
return VMCI_ERROR_NO_ACCESS;
|
|
|
|
if (entry->create_id == VMCI_HOST_CONTEXT_ID) {
|
|
/*
|
|
* Do not attach if the caller doesn't support Host Queue Pairs
|
|
* and a host created this queue pair.
|
|
*/
|
|
|
|
if (!vmci_ctx_supports_host_qp(context))
|
|
return VMCI_ERROR_INVALID_RESOURCE;
|
|
|
|
} else if (context_id == VMCI_HOST_CONTEXT_ID) {
|
|
struct vmci_ctx *create_context;
|
|
bool supports_host_qp;
|
|
|
|
/*
|
|
* Do not attach a host to a user created queue pair if that
|
|
* user doesn't support host queue pair end points.
|
|
*/
|
|
|
|
create_context = vmci_ctx_get(entry->create_id);
|
|
supports_host_qp = vmci_ctx_supports_host_qp(create_context);
|
|
vmci_ctx_put(create_context);
|
|
|
|
if (!supports_host_qp)
|
|
return VMCI_ERROR_INVALID_RESOURCE;
|
|
}
|
|
|
|
if ((entry->qp.flags & ~VMCI_QP_ASYMM) != (flags & ~VMCI_QP_ASYMM_PEER))
|
|
return VMCI_ERROR_QUEUEPAIR_MISMATCH;
|
|
|
|
if (context_id != VMCI_HOST_CONTEXT_ID) {
|
|
/*
|
|
* The queue pair broker entry stores values from the guest
|
|
* point of view, so an attaching guest should match the values
|
|
* stored in the entry.
|
|
*/
|
|
|
|
if (entry->qp.produce_size != produce_size ||
|
|
entry->qp.consume_size != consume_size) {
|
|
return VMCI_ERROR_QUEUEPAIR_MISMATCH;
|
|
}
|
|
} else if (entry->qp.produce_size != consume_size ||
|
|
entry->qp.consume_size != produce_size) {
|
|
return VMCI_ERROR_QUEUEPAIR_MISMATCH;
|
|
}
|
|
|
|
if (context_id != VMCI_HOST_CONTEXT_ID) {
|
|
/*
|
|
* If a guest attached to a queue pair, it will supply
|
|
* the backing memory. If this is a pre NOVMVM vmx,
|
|
* the backing memory will be supplied by calling
|
|
* vmci_qp_broker_set_page_store() following the
|
|
* return of the vmci_qp_broker_alloc() call. If it is
|
|
* a vmx of version NOVMVM or later, the page store
|
|
* must be supplied as part of the
|
|
* vmci_qp_broker_alloc call. Under all circumstances
|
|
* must the initially created queue pair not have any
|
|
* memory associated with it already.
|
|
*/
|
|
|
|
if (entry->state != VMCIQPB_CREATED_NO_MEM)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
if (page_store != NULL) {
|
|
/*
|
|
* Patch up host state to point to guest
|
|
* supplied memory. The VMX already
|
|
* initialized the queue pair headers, so no
|
|
* need for the kernel side to do that.
|
|
*/
|
|
|
|
result = qp_host_register_user_memory(page_store,
|
|
entry->produce_q,
|
|
entry->consume_q);
|
|
if (result < VMCI_SUCCESS)
|
|
return result;
|
|
|
|
entry->state = VMCIQPB_ATTACHED_MEM;
|
|
} else {
|
|
entry->state = VMCIQPB_ATTACHED_NO_MEM;
|
|
}
|
|
} else if (entry->state == VMCIQPB_CREATED_NO_MEM) {
|
|
/*
|
|
* The host side is attempting to attach to a queue
|
|
* pair that doesn't have any memory associated with
|
|
* it. This must be a pre NOVMVM vmx that hasn't set
|
|
* the page store information yet, or a quiesced VM.
|
|
*/
|
|
|
|
return VMCI_ERROR_UNAVAILABLE;
|
|
} else {
|
|
/* The host side has successfully attached to a queue pair. */
|
|
entry->state = VMCIQPB_ATTACHED_MEM;
|
|
}
|
|
|
|
if (entry->state == VMCIQPB_ATTACHED_MEM) {
|
|
result =
|
|
qp_notify_peer(true, entry->qp.handle, context_id,
|
|
entry->create_id);
|
|
if (result < VMCI_SUCCESS)
|
|
pr_warn("Failed to notify peer (ID=0x%x) of attach to queue pair (handle=0x%x:0x%x)\n",
|
|
entry->create_id, entry->qp.handle.context,
|
|
entry->qp.handle.resource);
|
|
}
|
|
|
|
entry->attach_id = context_id;
|
|
entry->qp.ref_count++;
|
|
if (wakeup_cb) {
|
|
entry->wakeup_cb = wakeup_cb;
|
|
entry->client_data = client_data;
|
|
}
|
|
|
|
/*
|
|
* When attaching to local queue pairs, the context already has
|
|
* an entry tracking the queue pair, so don't add another one.
|
|
*/
|
|
if (!is_local)
|
|
vmci_ctx_qp_create(context, entry->qp.handle);
|
|
|
|
if (ent != NULL)
|
|
*ent = entry;
|
|
|
|
return VMCI_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* queue_pair_Alloc for use when setting up queue pair endpoints
|
|
* on the host.
|
|
*/
|
|
static int qp_broker_alloc(struct vmci_handle handle,
|
|
u32 peer,
|
|
u32 flags,
|
|
u32 priv_flags,
|
|
u64 produce_size,
|
|
u64 consume_size,
|
|
struct vmci_qp_page_store *page_store,
|
|
struct vmci_ctx *context,
|
|
vmci_event_release_cb wakeup_cb,
|
|
void *client_data,
|
|
struct qp_broker_entry **ent,
|
|
bool *swap)
|
|
{
|
|
const u32 context_id = vmci_ctx_get_id(context);
|
|
bool create;
|
|
struct qp_broker_entry *entry = NULL;
|
|
bool is_local = flags & VMCI_QPFLAG_LOCAL;
|
|
int result;
|
|
|
|
if (vmci_handle_is_invalid(handle) ||
|
|
(flags & ~VMCI_QP_ALL_FLAGS) || is_local ||
|
|
!(produce_size || consume_size) ||
|
|
!context || context_id == VMCI_INVALID_ID ||
|
|
handle.context == VMCI_INVALID_ID) {
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
}
|
|
|
|
if (page_store && !VMCI_QP_PAGESTORE_IS_WELLFORMED(page_store))
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
/*
|
|
* In the initial argument check, we ensure that non-vmkernel hosts
|
|
* are not allowed to create local queue pairs.
|
|
*/
|
|
|
|
mutex_lock(&qp_broker_list.mutex);
|
|
|
|
if (!is_local && vmci_ctx_qp_exists(context, handle)) {
|
|
pr_devel("Context (ID=0x%x) already attached to queue pair (handle=0x%x:0x%x)\n",
|
|
context_id, handle.context, handle.resource);
|
|
mutex_unlock(&qp_broker_list.mutex);
|
|
return VMCI_ERROR_ALREADY_EXISTS;
|
|
}
|
|
|
|
if (handle.resource != VMCI_INVALID_ID)
|
|
entry = qp_broker_handle_to_entry(handle);
|
|
|
|
if (!entry) {
|
|
create = true;
|
|
result =
|
|
qp_broker_create(handle, peer, flags, priv_flags,
|
|
produce_size, consume_size, page_store,
|
|
context, wakeup_cb, client_data, ent);
|
|
} else {
|
|
create = false;
|
|
result =
|
|
qp_broker_attach(entry, peer, flags, priv_flags,
|
|
produce_size, consume_size, page_store,
|
|
context, wakeup_cb, client_data, ent);
|
|
}
|
|
|
|
mutex_unlock(&qp_broker_list.mutex);
|
|
|
|
if (swap)
|
|
*swap = (context_id == VMCI_HOST_CONTEXT_ID) &&
|
|
!(create && is_local);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* This function implements the kernel API for allocating a queue
|
|
* pair.
|
|
*/
|
|
static int qp_alloc_host_work(struct vmci_handle *handle,
|
|
struct vmci_queue **produce_q,
|
|
u64 produce_size,
|
|
struct vmci_queue **consume_q,
|
|
u64 consume_size,
|
|
u32 peer,
|
|
u32 flags,
|
|
u32 priv_flags,
|
|
vmci_event_release_cb wakeup_cb,
|
|
void *client_data)
|
|
{
|
|
struct vmci_handle new_handle;
|
|
struct vmci_ctx *context;
|
|
struct qp_broker_entry *entry;
|
|
int result;
|
|
bool swap;
|
|
|
|
if (vmci_handle_is_invalid(*handle)) {
|
|
new_handle = vmci_make_handle(
|
|
VMCI_HOST_CONTEXT_ID, VMCI_INVALID_ID);
|
|
} else
|
|
new_handle = *handle;
|
|
|
|
context = vmci_ctx_get(VMCI_HOST_CONTEXT_ID);
|
|
entry = NULL;
|
|
result =
|
|
qp_broker_alloc(new_handle, peer, flags, priv_flags,
|
|
produce_size, consume_size, NULL, context,
|
|
wakeup_cb, client_data, &entry, &swap);
|
|
if (result == VMCI_SUCCESS) {
|
|
if (swap) {
|
|
/*
|
|
* If this is a local queue pair, the attacher
|
|
* will swap around produce and consume
|
|
* queues.
|
|
*/
|
|
|
|
*produce_q = entry->consume_q;
|
|
*consume_q = entry->produce_q;
|
|
} else {
|
|
*produce_q = entry->produce_q;
|
|
*consume_q = entry->consume_q;
|
|
}
|
|
|
|
*handle = vmci_resource_handle(&entry->resource);
|
|
} else {
|
|
*handle = VMCI_INVALID_HANDLE;
|
|
pr_devel("queue pair broker failed to alloc (result=%d)\n",
|
|
result);
|
|
}
|
|
vmci_ctx_put(context);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Allocates a VMCI queue_pair. Only checks validity of input
|
|
* arguments. The real work is done in the host or guest
|
|
* specific function.
|
|
*/
|
|
int vmci_qp_alloc(struct vmci_handle *handle,
|
|
struct vmci_queue **produce_q,
|
|
u64 produce_size,
|
|
struct vmci_queue **consume_q,
|
|
u64 consume_size,
|
|
u32 peer,
|
|
u32 flags,
|
|
u32 priv_flags,
|
|
bool guest_endpoint,
|
|
vmci_event_release_cb wakeup_cb,
|
|
void *client_data)
|
|
{
|
|
if (!handle || !produce_q || !consume_q ||
|
|
(!produce_size && !consume_size) || (flags & ~VMCI_QP_ALL_FLAGS))
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
if (guest_endpoint) {
|
|
return qp_alloc_guest_work(handle, produce_q,
|
|
produce_size, consume_q,
|
|
consume_size, peer,
|
|
flags, priv_flags);
|
|
} else {
|
|
return qp_alloc_host_work(handle, produce_q,
|
|
produce_size, consume_q,
|
|
consume_size, peer, flags,
|
|
priv_flags, wakeup_cb, client_data);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function implements the host kernel API for detaching from
|
|
* a queue pair.
|
|
*/
|
|
static int qp_detatch_host_work(struct vmci_handle handle)
|
|
{
|
|
int result;
|
|
struct vmci_ctx *context;
|
|
|
|
context = vmci_ctx_get(VMCI_HOST_CONTEXT_ID);
|
|
|
|
result = vmci_qp_broker_detach(handle, context);
|
|
|
|
vmci_ctx_put(context);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Detaches from a VMCI queue_pair. Only checks validity of input argument.
|
|
* Real work is done in the host or guest specific function.
|
|
*/
|
|
static int qp_detatch(struct vmci_handle handle, bool guest_endpoint)
|
|
{
|
|
if (vmci_handle_is_invalid(handle))
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
if (guest_endpoint)
|
|
return qp_detatch_guest_work(handle);
|
|
else
|
|
return qp_detatch_host_work(handle);
|
|
}
|
|
|
|
/*
|
|
* Returns the entry from the head of the list. Assumes that the list is
|
|
* locked.
|
|
*/
|
|
static struct qp_entry *qp_list_get_head(struct qp_list *qp_list)
|
|
{
|
|
if (!list_empty(&qp_list->head)) {
|
|
struct qp_entry *entry =
|
|
list_first_entry(&qp_list->head, struct qp_entry,
|
|
list_item);
|
|
return entry;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void vmci_qp_broker_exit(void)
|
|
{
|
|
struct qp_entry *entry;
|
|
struct qp_broker_entry *be;
|
|
|
|
mutex_lock(&qp_broker_list.mutex);
|
|
|
|
while ((entry = qp_list_get_head(&qp_broker_list))) {
|
|
be = (struct qp_broker_entry *)entry;
|
|
|
|
qp_list_remove_entry(&qp_broker_list, entry);
|
|
kfree(be);
|
|
}
|
|
|
|
mutex_unlock(&qp_broker_list.mutex);
|
|
}
|
|
|
|
/*
|
|
* Requests that a queue pair be allocated with the VMCI queue
|
|
* pair broker. Allocates a queue pair entry if one does not
|
|
* exist. Attaches to one if it exists, and retrieves the page
|
|
* files backing that queue_pair. Assumes that the queue pair
|
|
* broker lock is held.
|
|
*/
|
|
int vmci_qp_broker_alloc(struct vmci_handle handle,
|
|
u32 peer,
|
|
u32 flags,
|
|
u32 priv_flags,
|
|
u64 produce_size,
|
|
u64 consume_size,
|
|
struct vmci_qp_page_store *page_store,
|
|
struct vmci_ctx *context)
|
|
{
|
|
return qp_broker_alloc(handle, peer, flags, priv_flags,
|
|
produce_size, consume_size,
|
|
page_store, context, NULL, NULL, NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* VMX'en with versions lower than VMCI_VERSION_NOVMVM use a separate
|
|
* step to add the UVAs of the VMX mapping of the queue pair. This function
|
|
* provides backwards compatibility with such VMX'en, and takes care of
|
|
* registering the page store for a queue pair previously allocated by the
|
|
* VMX during create or attach. This function will move the queue pair state
|
|
* to either from VMCIQBP_CREATED_NO_MEM to VMCIQBP_CREATED_MEM or
|
|
* VMCIQBP_ATTACHED_NO_MEM to VMCIQBP_ATTACHED_MEM. If moving to the
|
|
* attached state with memory, the queue pair is ready to be used by the
|
|
* host peer, and an attached event will be generated.
|
|
*
|
|
* Assumes that the queue pair broker lock is held.
|
|
*
|
|
* This function is only used by the hosted platform, since there is no
|
|
* issue with backwards compatibility for vmkernel.
|
|
*/
|
|
int vmci_qp_broker_set_page_store(struct vmci_handle handle,
|
|
u64 produce_uva,
|
|
u64 consume_uva,
|
|
struct vmci_ctx *context)
|
|
{
|
|
struct qp_broker_entry *entry;
|
|
int result;
|
|
const u32 context_id = vmci_ctx_get_id(context);
|
|
|
|
if (vmci_handle_is_invalid(handle) || !context ||
|
|
context_id == VMCI_INVALID_ID)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
/*
|
|
* We only support guest to host queue pairs, so the VMX must
|
|
* supply UVAs for the mapped page files.
|
|
*/
|
|
|
|
if (produce_uva == 0 || consume_uva == 0)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
mutex_lock(&qp_broker_list.mutex);
|
|
|
|
if (!vmci_ctx_qp_exists(context, handle)) {
|
|
pr_warn("Context (ID=0x%x) not attached to queue pair (handle=0x%x:0x%x)\n",
|
|
context_id, handle.context, handle.resource);
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto out;
|
|
}
|
|
|
|
entry = qp_broker_handle_to_entry(handle);
|
|
if (!entry) {
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If I'm the owner then I can set the page store.
|
|
*
|
|
* Or, if a host created the queue_pair and I'm the attached peer
|
|
* then I can set the page store.
|
|
*/
|
|
if (entry->create_id != context_id &&
|
|
(entry->create_id != VMCI_HOST_CONTEXT_ID ||
|
|
entry->attach_id != context_id)) {
|
|
result = VMCI_ERROR_QUEUEPAIR_NOTOWNER;
|
|
goto out;
|
|
}
|
|
|
|
if (entry->state != VMCIQPB_CREATED_NO_MEM &&
|
|
entry->state != VMCIQPB_ATTACHED_NO_MEM) {
|
|
result = VMCI_ERROR_UNAVAILABLE;
|
|
goto out;
|
|
}
|
|
|
|
result = qp_host_get_user_memory(produce_uva, consume_uva,
|
|
entry->produce_q, entry->consume_q);
|
|
if (result < VMCI_SUCCESS)
|
|
goto out;
|
|
|
|
result = qp_host_map_queues(entry->produce_q, entry->consume_q);
|
|
if (result < VMCI_SUCCESS) {
|
|
qp_host_unregister_user_memory(entry->produce_q,
|
|
entry->consume_q);
|
|
goto out;
|
|
}
|
|
|
|
if (entry->state == VMCIQPB_CREATED_NO_MEM)
|
|
entry->state = VMCIQPB_CREATED_MEM;
|
|
else
|
|
entry->state = VMCIQPB_ATTACHED_MEM;
|
|
|
|
entry->vmci_page_files = true;
|
|
|
|
if (entry->state == VMCIQPB_ATTACHED_MEM) {
|
|
result =
|
|
qp_notify_peer(true, handle, context_id, entry->create_id);
|
|
if (result < VMCI_SUCCESS) {
|
|
pr_warn("Failed to notify peer (ID=0x%x) of attach to queue pair (handle=0x%x:0x%x)\n",
|
|
entry->create_id, entry->qp.handle.context,
|
|
entry->qp.handle.resource);
|
|
}
|
|
}
|
|
|
|
result = VMCI_SUCCESS;
|
|
out:
|
|
mutex_unlock(&qp_broker_list.mutex);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Resets saved queue headers for the given QP broker
|
|
* entry. Should be used when guest memory becomes available
|
|
* again, or the guest detaches.
|
|
*/
|
|
static void qp_reset_saved_headers(struct qp_broker_entry *entry)
|
|
{
|
|
entry->produce_q->saved_header = NULL;
|
|
entry->consume_q->saved_header = NULL;
|
|
}
|
|
|
|
/*
|
|
* The main entry point for detaching from a queue pair registered with the
|
|
* queue pair broker. If more than one endpoint is attached to the queue
|
|
* pair, the first endpoint will mainly decrement a reference count and
|
|
* generate a notification to its peer. The last endpoint will clean up
|
|
* the queue pair state registered with the broker.
|
|
*
|
|
* When a guest endpoint detaches, it will unmap and unregister the guest
|
|
* memory backing the queue pair. If the host is still attached, it will
|
|
* no longer be able to access the queue pair content.
|
|
*
|
|
* If the queue pair is already in a state where there is no memory
|
|
* registered for the queue pair (any *_NO_MEM state), it will transition to
|
|
* the VMCIQPB_SHUTDOWN_NO_MEM state. This will also happen, if a guest
|
|
* endpoint is the first of two endpoints to detach. If the host endpoint is
|
|
* the first out of two to detach, the queue pair will move to the
|
|
* VMCIQPB_SHUTDOWN_MEM state.
|
|
*/
|
|
int vmci_qp_broker_detach(struct vmci_handle handle, struct vmci_ctx *context)
|
|
{
|
|
struct qp_broker_entry *entry;
|
|
const u32 context_id = vmci_ctx_get_id(context);
|
|
u32 peer_id;
|
|
bool is_local = false;
|
|
int result;
|
|
|
|
if (vmci_handle_is_invalid(handle) || !context ||
|
|
context_id == VMCI_INVALID_ID) {
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
}
|
|
|
|
mutex_lock(&qp_broker_list.mutex);
|
|
|
|
if (!vmci_ctx_qp_exists(context, handle)) {
|
|
pr_devel("Context (ID=0x%x) not attached to queue pair (handle=0x%x:0x%x)\n",
|
|
context_id, handle.context, handle.resource);
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto out;
|
|
}
|
|
|
|
entry = qp_broker_handle_to_entry(handle);
|
|
if (!entry) {
|
|
pr_devel("Context (ID=0x%x) reports being attached to queue pair(handle=0x%x:0x%x) that isn't present in broker\n",
|
|
context_id, handle.context, handle.resource);
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto out;
|
|
}
|
|
|
|
if (context_id != entry->create_id && context_id != entry->attach_id) {
|
|
result = VMCI_ERROR_QUEUEPAIR_NOTATTACHED;
|
|
goto out;
|
|
}
|
|
|
|
if (context_id == entry->create_id) {
|
|
peer_id = entry->attach_id;
|
|
entry->create_id = VMCI_INVALID_ID;
|
|
} else {
|
|
peer_id = entry->create_id;
|
|
entry->attach_id = VMCI_INVALID_ID;
|
|
}
|
|
entry->qp.ref_count--;
|
|
|
|
is_local = entry->qp.flags & VMCI_QPFLAG_LOCAL;
|
|
|
|
if (context_id != VMCI_HOST_CONTEXT_ID) {
|
|
bool headers_mapped;
|
|
|
|
/*
|
|
* Pre NOVMVM vmx'en may detach from a queue pair
|
|
* before setting the page store, and in that case
|
|
* there is no user memory to detach from. Also, more
|
|
* recent VMX'en may detach from a queue pair in the
|
|
* quiesced state.
|
|
*/
|
|
|
|
qp_acquire_queue_mutex(entry->produce_q);
|
|
headers_mapped = entry->produce_q->q_header ||
|
|
entry->consume_q->q_header;
|
|
if (QPBROKERSTATE_HAS_MEM(entry)) {
|
|
result =
|
|
qp_host_unmap_queues(INVALID_VMCI_GUEST_MEM_ID,
|
|
entry->produce_q,
|
|
entry->consume_q);
|
|
if (result < VMCI_SUCCESS)
|
|
pr_warn("Failed to unmap queue headers for queue pair (handle=0x%x:0x%x,result=%d)\n",
|
|
handle.context, handle.resource,
|
|
result);
|
|
|
|
qp_host_unregister_user_memory(entry->produce_q,
|
|
entry->consume_q);
|
|
|
|
}
|
|
|
|
if (!headers_mapped)
|
|
qp_reset_saved_headers(entry);
|
|
|
|
qp_release_queue_mutex(entry->produce_q);
|
|
|
|
if (!headers_mapped && entry->wakeup_cb)
|
|
entry->wakeup_cb(entry->client_data);
|
|
|
|
} else {
|
|
if (entry->wakeup_cb) {
|
|
entry->wakeup_cb = NULL;
|
|
entry->client_data = NULL;
|
|
}
|
|
}
|
|
|
|
if (entry->qp.ref_count == 0) {
|
|
qp_list_remove_entry(&qp_broker_list, &entry->qp);
|
|
|
|
if (is_local)
|
|
kfree(entry->local_mem);
|
|
|
|
qp_cleanup_queue_mutex(entry->produce_q, entry->consume_q);
|
|
qp_host_free_queue(entry->produce_q, entry->qp.produce_size);
|
|
qp_host_free_queue(entry->consume_q, entry->qp.consume_size);
|
|
/* Unlink from resource hash table and free callback */
|
|
vmci_resource_remove(&entry->resource);
|
|
|
|
kfree(entry);
|
|
|
|
vmci_ctx_qp_destroy(context, handle);
|
|
} else {
|
|
qp_notify_peer(false, handle, context_id, peer_id);
|
|
if (context_id == VMCI_HOST_CONTEXT_ID &&
|
|
QPBROKERSTATE_HAS_MEM(entry)) {
|
|
entry->state = VMCIQPB_SHUTDOWN_MEM;
|
|
} else {
|
|
entry->state = VMCIQPB_SHUTDOWN_NO_MEM;
|
|
}
|
|
|
|
if (!is_local)
|
|
vmci_ctx_qp_destroy(context, handle);
|
|
|
|
}
|
|
result = VMCI_SUCCESS;
|
|
out:
|
|
mutex_unlock(&qp_broker_list.mutex);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Establishes the necessary mappings for a queue pair given a
|
|
* reference to the queue pair guest memory. This is usually
|
|
* called when a guest is unquiesced and the VMX is allowed to
|
|
* map guest memory once again.
|
|
*/
|
|
int vmci_qp_broker_map(struct vmci_handle handle,
|
|
struct vmci_ctx *context,
|
|
u64 guest_mem)
|
|
{
|
|
struct qp_broker_entry *entry;
|
|
const u32 context_id = vmci_ctx_get_id(context);
|
|
int result;
|
|
|
|
if (vmci_handle_is_invalid(handle) || !context ||
|
|
context_id == VMCI_INVALID_ID)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
mutex_lock(&qp_broker_list.mutex);
|
|
|
|
if (!vmci_ctx_qp_exists(context, handle)) {
|
|
pr_devel("Context (ID=0x%x) not attached to queue pair (handle=0x%x:0x%x)\n",
|
|
context_id, handle.context, handle.resource);
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto out;
|
|
}
|
|
|
|
entry = qp_broker_handle_to_entry(handle);
|
|
if (!entry) {
|
|
pr_devel("Context (ID=0x%x) reports being attached to queue pair (handle=0x%x:0x%x) that isn't present in broker\n",
|
|
context_id, handle.context, handle.resource);
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto out;
|
|
}
|
|
|
|
if (context_id != entry->create_id && context_id != entry->attach_id) {
|
|
result = VMCI_ERROR_QUEUEPAIR_NOTATTACHED;
|
|
goto out;
|
|
}
|
|
|
|
result = VMCI_SUCCESS;
|
|
|
|
if (context_id != VMCI_HOST_CONTEXT_ID) {
|
|
struct vmci_qp_page_store page_store;
|
|
|
|
page_store.pages = guest_mem;
|
|
page_store.len = QPE_NUM_PAGES(entry->qp);
|
|
|
|
qp_acquire_queue_mutex(entry->produce_q);
|
|
qp_reset_saved_headers(entry);
|
|
result =
|
|
qp_host_register_user_memory(&page_store,
|
|
entry->produce_q,
|
|
entry->consume_q);
|
|
qp_release_queue_mutex(entry->produce_q);
|
|
if (result == VMCI_SUCCESS) {
|
|
/* Move state from *_NO_MEM to *_MEM */
|
|
|
|
entry->state++;
|
|
|
|
if (entry->wakeup_cb)
|
|
entry->wakeup_cb(entry->client_data);
|
|
}
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&qp_broker_list.mutex);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Saves a snapshot of the queue headers for the given QP broker
|
|
* entry. Should be used when guest memory is unmapped.
|
|
* Results:
|
|
* VMCI_SUCCESS on success, appropriate error code if guest memory
|
|
* can't be accessed..
|
|
*/
|
|
static int qp_save_headers(struct qp_broker_entry *entry)
|
|
{
|
|
int result;
|
|
|
|
if (entry->produce_q->saved_header != NULL &&
|
|
entry->consume_q->saved_header != NULL) {
|
|
/*
|
|
* If the headers have already been saved, we don't need to do
|
|
* it again, and we don't want to map in the headers
|
|
* unnecessarily.
|
|
*/
|
|
|
|
return VMCI_SUCCESS;
|
|
}
|
|
|
|
if (NULL == entry->produce_q->q_header ||
|
|
NULL == entry->consume_q->q_header) {
|
|
result = qp_host_map_queues(entry->produce_q, entry->consume_q);
|
|
if (result < VMCI_SUCCESS)
|
|
return result;
|
|
}
|
|
|
|
memcpy(&entry->saved_produce_q, entry->produce_q->q_header,
|
|
sizeof(entry->saved_produce_q));
|
|
entry->produce_q->saved_header = &entry->saved_produce_q;
|
|
memcpy(&entry->saved_consume_q, entry->consume_q->q_header,
|
|
sizeof(entry->saved_consume_q));
|
|
entry->consume_q->saved_header = &entry->saved_consume_q;
|
|
|
|
return VMCI_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Removes all references to the guest memory of a given queue pair, and
|
|
* will move the queue pair from state *_MEM to *_NO_MEM. It is usually
|
|
* called when a VM is being quiesced where access to guest memory should
|
|
* avoided.
|
|
*/
|
|
int vmci_qp_broker_unmap(struct vmci_handle handle,
|
|
struct vmci_ctx *context,
|
|
u32 gid)
|
|
{
|
|
struct qp_broker_entry *entry;
|
|
const u32 context_id = vmci_ctx_get_id(context);
|
|
int result;
|
|
|
|
if (vmci_handle_is_invalid(handle) || !context ||
|
|
context_id == VMCI_INVALID_ID)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
mutex_lock(&qp_broker_list.mutex);
|
|
|
|
if (!vmci_ctx_qp_exists(context, handle)) {
|
|
pr_devel("Context (ID=0x%x) not attached to queue pair (handle=0x%x:0x%x)\n",
|
|
context_id, handle.context, handle.resource);
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto out;
|
|
}
|
|
|
|
entry = qp_broker_handle_to_entry(handle);
|
|
if (!entry) {
|
|
pr_devel("Context (ID=0x%x) reports being attached to queue pair (handle=0x%x:0x%x) that isn't present in broker\n",
|
|
context_id, handle.context, handle.resource);
|
|
result = VMCI_ERROR_NOT_FOUND;
|
|
goto out;
|
|
}
|
|
|
|
if (context_id != entry->create_id && context_id != entry->attach_id) {
|
|
result = VMCI_ERROR_QUEUEPAIR_NOTATTACHED;
|
|
goto out;
|
|
}
|
|
|
|
if (context_id != VMCI_HOST_CONTEXT_ID) {
|
|
qp_acquire_queue_mutex(entry->produce_q);
|
|
result = qp_save_headers(entry);
|
|
if (result < VMCI_SUCCESS)
|
|
pr_warn("Failed to save queue headers for queue pair (handle=0x%x:0x%x,result=%d)\n",
|
|
handle.context, handle.resource, result);
|
|
|
|
qp_host_unmap_queues(gid, entry->produce_q, entry->consume_q);
|
|
|
|
/*
|
|
* On hosted, when we unmap queue pairs, the VMX will also
|
|
* unmap the guest memory, so we invalidate the previously
|
|
* registered memory. If the queue pair is mapped again at a
|
|
* later point in time, we will need to reregister the user
|
|
* memory with a possibly new user VA.
|
|
*/
|
|
qp_host_unregister_user_memory(entry->produce_q,
|
|
entry->consume_q);
|
|
|
|
/*
|
|
* Move state from *_MEM to *_NO_MEM.
|
|
*/
|
|
entry->state--;
|
|
|
|
qp_release_queue_mutex(entry->produce_q);
|
|
}
|
|
|
|
result = VMCI_SUCCESS;
|
|
|
|
out:
|
|
mutex_unlock(&qp_broker_list.mutex);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Destroys all guest queue pair endpoints. If active guest queue
|
|
* pairs still exist, hypercalls to attempt detach from these
|
|
* queue pairs will be made. Any failure to detach is silently
|
|
* ignored.
|
|
*/
|
|
void vmci_qp_guest_endpoints_exit(void)
|
|
{
|
|
struct qp_entry *entry;
|
|
struct qp_guest_endpoint *ep;
|
|
|
|
mutex_lock(&qp_guest_endpoints.mutex);
|
|
|
|
while ((entry = qp_list_get_head(&qp_guest_endpoints))) {
|
|
ep = (struct qp_guest_endpoint *)entry;
|
|
|
|
/* Don't make a hypercall for local queue_pairs. */
|
|
if (!(entry->flags & VMCI_QPFLAG_LOCAL))
|
|
qp_detatch_hypercall(entry->handle);
|
|
|
|
/* We cannot fail the exit, so let's reset ref_count. */
|
|
entry->ref_count = 0;
|
|
qp_list_remove_entry(&qp_guest_endpoints, entry);
|
|
|
|
qp_guest_endpoint_destroy(ep);
|
|
}
|
|
|
|
mutex_unlock(&qp_guest_endpoints.mutex);
|
|
}
|
|
|
|
/*
|
|
* Helper routine that will lock the queue pair before subsequent
|
|
* operations.
|
|
* Note: Non-blocking on the host side is currently only implemented in ESX.
|
|
* Since non-blocking isn't yet implemented on the host personality we
|
|
* have no reason to acquire a spin lock. So to avoid the use of an
|
|
* unnecessary lock only acquire the mutex if we can block.
|
|
*/
|
|
static void qp_lock(const struct vmci_qp *qpair)
|
|
{
|
|
qp_acquire_queue_mutex(qpair->produce_q);
|
|
}
|
|
|
|
/*
|
|
* Helper routine that unlocks the queue pair after calling
|
|
* qp_lock.
|
|
*/
|
|
static void qp_unlock(const struct vmci_qp *qpair)
|
|
{
|
|
qp_release_queue_mutex(qpair->produce_q);
|
|
}
|
|
|
|
/*
|
|
* The queue headers may not be mapped at all times. If a queue is
|
|
* currently not mapped, it will be attempted to do so.
|
|
*/
|
|
static int qp_map_queue_headers(struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q)
|
|
{
|
|
int result;
|
|
|
|
if (NULL == produce_q->q_header || NULL == consume_q->q_header) {
|
|
result = qp_host_map_queues(produce_q, consume_q);
|
|
if (result < VMCI_SUCCESS)
|
|
return (produce_q->saved_header &&
|
|
consume_q->saved_header) ?
|
|
VMCI_ERROR_QUEUEPAIR_NOT_READY :
|
|
VMCI_ERROR_QUEUEPAIR_NOTATTACHED;
|
|
}
|
|
|
|
return VMCI_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Helper routine that will retrieve the produce and consume
|
|
* headers of a given queue pair. If the guest memory of the
|
|
* queue pair is currently not available, the saved queue headers
|
|
* will be returned, if these are available.
|
|
*/
|
|
static int qp_get_queue_headers(const struct vmci_qp *qpair,
|
|
struct vmci_queue_header **produce_q_header,
|
|
struct vmci_queue_header **consume_q_header)
|
|
{
|
|
int result;
|
|
|
|
result = qp_map_queue_headers(qpair->produce_q, qpair->consume_q);
|
|
if (result == VMCI_SUCCESS) {
|
|
*produce_q_header = qpair->produce_q->q_header;
|
|
*consume_q_header = qpair->consume_q->q_header;
|
|
} else if (qpair->produce_q->saved_header &&
|
|
qpair->consume_q->saved_header) {
|
|
*produce_q_header = qpair->produce_q->saved_header;
|
|
*consume_q_header = qpair->consume_q->saved_header;
|
|
result = VMCI_SUCCESS;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Callback from VMCI queue pair broker indicating that a queue
|
|
* pair that was previously not ready, now either is ready or
|
|
* gone forever.
|
|
*/
|
|
static int qp_wakeup_cb(void *client_data)
|
|
{
|
|
struct vmci_qp *qpair = (struct vmci_qp *)client_data;
|
|
|
|
qp_lock(qpair);
|
|
while (qpair->blocked > 0) {
|
|
qpair->blocked--;
|
|
qpair->generation++;
|
|
wake_up(&qpair->event);
|
|
}
|
|
qp_unlock(qpair);
|
|
|
|
return VMCI_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Makes the calling thread wait for the queue pair to become
|
|
* ready for host side access. Returns true when thread is
|
|
* woken up after queue pair state change, false otherwise.
|
|
*/
|
|
static bool qp_wait_for_ready_queue(struct vmci_qp *qpair)
|
|
{
|
|
unsigned int generation;
|
|
|
|
qpair->blocked++;
|
|
generation = qpair->generation;
|
|
qp_unlock(qpair);
|
|
wait_event(qpair->event, generation != qpair->generation);
|
|
qp_lock(qpair);
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Enqueues a given buffer to the produce queue using the provided
|
|
* function. As many bytes as possible (space available in the queue)
|
|
* are enqueued. Assumes the queue->mutex has been acquired. Returns
|
|
* VMCI_ERROR_QUEUEPAIR_NOSPACE if no space was available to enqueue
|
|
* data, VMCI_ERROR_INVALID_SIZE, if any queue pointer is outside the
|
|
* queue (as defined by the queue size), VMCI_ERROR_INVALID_ARGS, if
|
|
* an error occured when accessing the buffer,
|
|
* VMCI_ERROR_QUEUEPAIR_NOTATTACHED, if the queue pair pages aren't
|
|
* available. Otherwise, the number of bytes written to the queue is
|
|
* returned. Updates the tail pointer of the produce queue.
|
|
*/
|
|
static ssize_t qp_enqueue_locked(struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q,
|
|
const u64 produce_q_size,
|
|
struct iov_iter *from)
|
|
{
|
|
s64 free_space;
|
|
u64 tail;
|
|
size_t buf_size = iov_iter_count(from);
|
|
size_t written;
|
|
ssize_t result;
|
|
|
|
result = qp_map_queue_headers(produce_q, consume_q);
|
|
if (unlikely(result != VMCI_SUCCESS))
|
|
return result;
|
|
|
|
free_space = vmci_q_header_free_space(produce_q->q_header,
|
|
consume_q->q_header,
|
|
produce_q_size);
|
|
if (free_space == 0)
|
|
return VMCI_ERROR_QUEUEPAIR_NOSPACE;
|
|
|
|
if (free_space < VMCI_SUCCESS)
|
|
return (ssize_t) free_space;
|
|
|
|
written = (size_t) (free_space > buf_size ? buf_size : free_space);
|
|
tail = vmci_q_header_producer_tail(produce_q->q_header);
|
|
if (likely(tail + written < produce_q_size)) {
|
|
result = qp_memcpy_to_queue_iter(produce_q, tail, from, written);
|
|
} else {
|
|
/* Tail pointer wraps around. */
|
|
|
|
const size_t tmp = (size_t) (produce_q_size - tail);
|
|
|
|
result = qp_memcpy_to_queue_iter(produce_q, tail, from, tmp);
|
|
if (result >= VMCI_SUCCESS)
|
|
result = qp_memcpy_to_queue_iter(produce_q, 0, from,
|
|
written - tmp);
|
|
}
|
|
|
|
if (result < VMCI_SUCCESS)
|
|
return result;
|
|
|
|
vmci_q_header_add_producer_tail(produce_q->q_header, written,
|
|
produce_q_size);
|
|
return written;
|
|
}
|
|
|
|
/*
|
|
* Dequeues data (if available) from the given consume queue. Writes data
|
|
* to the user provided buffer using the provided function.
|
|
* Assumes the queue->mutex has been acquired.
|
|
* Results:
|
|
* VMCI_ERROR_QUEUEPAIR_NODATA if no data was available to dequeue.
|
|
* VMCI_ERROR_INVALID_SIZE, if any queue pointer is outside the queue
|
|
* (as defined by the queue size).
|
|
* VMCI_ERROR_INVALID_ARGS, if an error occured when accessing the buffer.
|
|
* Otherwise the number of bytes dequeued is returned.
|
|
* Side effects:
|
|
* Updates the head pointer of the consume queue.
|
|
*/
|
|
static ssize_t qp_dequeue_locked(struct vmci_queue *produce_q,
|
|
struct vmci_queue *consume_q,
|
|
const u64 consume_q_size,
|
|
struct iov_iter *to,
|
|
bool update_consumer)
|
|
{
|
|
size_t buf_size = iov_iter_count(to);
|
|
s64 buf_ready;
|
|
u64 head;
|
|
size_t read;
|
|
ssize_t result;
|
|
|
|
result = qp_map_queue_headers(produce_q, consume_q);
|
|
if (unlikely(result != VMCI_SUCCESS))
|
|
return result;
|
|
|
|
buf_ready = vmci_q_header_buf_ready(consume_q->q_header,
|
|
produce_q->q_header,
|
|
consume_q_size);
|
|
if (buf_ready == 0)
|
|
return VMCI_ERROR_QUEUEPAIR_NODATA;
|
|
|
|
if (buf_ready < VMCI_SUCCESS)
|
|
return (ssize_t) buf_ready;
|
|
|
|
read = (size_t) (buf_ready > buf_size ? buf_size : buf_ready);
|
|
head = vmci_q_header_consumer_head(produce_q->q_header);
|
|
if (likely(head + read < consume_q_size)) {
|
|
result = qp_memcpy_from_queue_iter(to, consume_q, head, read);
|
|
} else {
|
|
/* Head pointer wraps around. */
|
|
|
|
const size_t tmp = (size_t) (consume_q_size - head);
|
|
|
|
result = qp_memcpy_from_queue_iter(to, consume_q, head, tmp);
|
|
if (result >= VMCI_SUCCESS)
|
|
result = qp_memcpy_from_queue_iter(to, consume_q, 0,
|
|
read - tmp);
|
|
|
|
}
|
|
|
|
if (result < VMCI_SUCCESS)
|
|
return result;
|
|
|
|
if (update_consumer)
|
|
vmci_q_header_add_consumer_head(produce_q->q_header,
|
|
read, consume_q_size);
|
|
|
|
return read;
|
|
}
|
|
|
|
/*
|
|
* vmci_qpair_alloc() - Allocates a queue pair.
|
|
* @qpair: Pointer for the new vmci_qp struct.
|
|
* @handle: Handle to track the resource.
|
|
* @produce_qsize: Desired size of the producer queue.
|
|
* @consume_qsize: Desired size of the consumer queue.
|
|
* @peer: ContextID of the peer.
|
|
* @flags: VMCI flags.
|
|
* @priv_flags: VMCI priviledge flags.
|
|
*
|
|
* This is the client interface for allocating the memory for a
|
|
* vmci_qp structure and then attaching to the underlying
|
|
* queue. If an error occurs allocating the memory for the
|
|
* vmci_qp structure no attempt is made to attach. If an
|
|
* error occurs attaching, then the structure is freed.
|
|
*/
|
|
int vmci_qpair_alloc(struct vmci_qp **qpair,
|
|
struct vmci_handle *handle,
|
|
u64 produce_qsize,
|
|
u64 consume_qsize,
|
|
u32 peer,
|
|
u32 flags,
|
|
u32 priv_flags)
|
|
{
|
|
struct vmci_qp *my_qpair;
|
|
int retval;
|
|
struct vmci_handle src = VMCI_INVALID_HANDLE;
|
|
struct vmci_handle dst = vmci_make_handle(peer, VMCI_INVALID_ID);
|
|
enum vmci_route route;
|
|
vmci_event_release_cb wakeup_cb;
|
|
void *client_data;
|
|
|
|
/*
|
|
* Restrict the size of a queuepair. The device already
|
|
* enforces a limit on the total amount of memory that can be
|
|
* allocated to queuepairs for a guest. However, we try to
|
|
* allocate this memory before we make the queuepair
|
|
* allocation hypercall. On Linux, we allocate each page
|
|
* separately, which means rather than fail, the guest will
|
|
* thrash while it tries to allocate, and will become
|
|
* increasingly unresponsive to the point where it appears to
|
|
* be hung. So we place a limit on the size of an individual
|
|
* queuepair here, and leave the device to enforce the
|
|
* restriction on total queuepair memory. (Note that this
|
|
* doesn't prevent all cases; a user with only this much
|
|
* physical memory could still get into trouble.) The error
|
|
* used by the device is NO_RESOURCES, so use that here too.
|
|
*/
|
|
|
|
if (produce_qsize + consume_qsize < max(produce_qsize, consume_qsize) ||
|
|
produce_qsize + consume_qsize > VMCI_MAX_GUEST_QP_MEMORY)
|
|
return VMCI_ERROR_NO_RESOURCES;
|
|
|
|
retval = vmci_route(&src, &dst, false, &route);
|
|
if (retval < VMCI_SUCCESS)
|
|
route = vmci_guest_code_active() ?
|
|
VMCI_ROUTE_AS_GUEST : VMCI_ROUTE_AS_HOST;
|
|
|
|
if (flags & (VMCI_QPFLAG_NONBLOCK | VMCI_QPFLAG_PINNED)) {
|
|
pr_devel("NONBLOCK OR PINNED set");
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
}
|
|
|
|
my_qpair = kzalloc(sizeof(*my_qpair), GFP_KERNEL);
|
|
if (!my_qpair)
|
|
return VMCI_ERROR_NO_MEM;
|
|
|
|
my_qpair->produce_q_size = produce_qsize;
|
|
my_qpair->consume_q_size = consume_qsize;
|
|
my_qpair->peer = peer;
|
|
my_qpair->flags = flags;
|
|
my_qpair->priv_flags = priv_flags;
|
|
|
|
wakeup_cb = NULL;
|
|
client_data = NULL;
|
|
|
|
if (VMCI_ROUTE_AS_HOST == route) {
|
|
my_qpair->guest_endpoint = false;
|
|
if (!(flags & VMCI_QPFLAG_LOCAL)) {
|
|
my_qpair->blocked = 0;
|
|
my_qpair->generation = 0;
|
|
init_waitqueue_head(&my_qpair->event);
|
|
wakeup_cb = qp_wakeup_cb;
|
|
client_data = (void *)my_qpair;
|
|
}
|
|
} else {
|
|
my_qpair->guest_endpoint = true;
|
|
}
|
|
|
|
retval = vmci_qp_alloc(handle,
|
|
&my_qpair->produce_q,
|
|
my_qpair->produce_q_size,
|
|
&my_qpair->consume_q,
|
|
my_qpair->consume_q_size,
|
|
my_qpair->peer,
|
|
my_qpair->flags,
|
|
my_qpair->priv_flags,
|
|
my_qpair->guest_endpoint,
|
|
wakeup_cb, client_data);
|
|
|
|
if (retval < VMCI_SUCCESS) {
|
|
kfree(my_qpair);
|
|
return retval;
|
|
}
|
|
|
|
*qpair = my_qpair;
|
|
my_qpair->handle = *handle;
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_alloc);
|
|
|
|
/*
|
|
* vmci_qpair_detach() - Detatches the client from a queue pair.
|
|
* @qpair: Reference of a pointer to the qpair struct.
|
|
*
|
|
* This is the client interface for detaching from a VMCIQPair.
|
|
* Note that this routine will free the memory allocated for the
|
|
* vmci_qp structure too.
|
|
*/
|
|
int vmci_qpair_detach(struct vmci_qp **qpair)
|
|
{
|
|
int result;
|
|
struct vmci_qp *old_qpair;
|
|
|
|
if (!qpair || !(*qpair))
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
old_qpair = *qpair;
|
|
result = qp_detatch(old_qpair->handle, old_qpair->guest_endpoint);
|
|
|
|
/*
|
|
* The guest can fail to detach for a number of reasons, and
|
|
* if it does so, it will cleanup the entry (if there is one).
|
|
* The host can fail too, but it won't cleanup the entry
|
|
* immediately, it will do that later when the context is
|
|
* freed. Either way, we need to release the qpair struct
|
|
* here; there isn't much the caller can do, and we don't want
|
|
* to leak.
|
|
*/
|
|
|
|
memset(old_qpair, 0, sizeof(*old_qpair));
|
|
old_qpair->handle = VMCI_INVALID_HANDLE;
|
|
old_qpair->peer = VMCI_INVALID_ID;
|
|
kfree(old_qpair);
|
|
*qpair = NULL;
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_detach);
|
|
|
|
/*
|
|
* vmci_qpair_get_produce_indexes() - Retrieves the indexes of the producer.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
* @producer_tail: Reference used for storing producer tail index.
|
|
* @consumer_head: Reference used for storing the consumer head index.
|
|
*
|
|
* This is the client interface for getting the current indexes of the
|
|
* QPair from the point of the view of the caller as the producer.
|
|
*/
|
|
int vmci_qpair_get_produce_indexes(const struct vmci_qp *qpair,
|
|
u64 *producer_tail,
|
|
u64 *consumer_head)
|
|
{
|
|
struct vmci_queue_header *produce_q_header;
|
|
struct vmci_queue_header *consume_q_header;
|
|
int result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
result =
|
|
qp_get_queue_headers(qpair, &produce_q_header, &consume_q_header);
|
|
if (result == VMCI_SUCCESS)
|
|
vmci_q_header_get_pointers(produce_q_header, consume_q_header,
|
|
producer_tail, consumer_head);
|
|
qp_unlock(qpair);
|
|
|
|
if (result == VMCI_SUCCESS &&
|
|
((producer_tail && *producer_tail >= qpair->produce_q_size) ||
|
|
(consumer_head && *consumer_head >= qpair->produce_q_size)))
|
|
return VMCI_ERROR_INVALID_SIZE;
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_get_produce_indexes);
|
|
|
|
/*
|
|
* vmci_qpair_get_consume_indexes() - Retrieves the indexes of the consumer.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
* @consumer_tail: Reference used for storing consumer tail index.
|
|
* @producer_head: Reference used for storing the producer head index.
|
|
*
|
|
* This is the client interface for getting the current indexes of the
|
|
* QPair from the point of the view of the caller as the consumer.
|
|
*/
|
|
int vmci_qpair_get_consume_indexes(const struct vmci_qp *qpair,
|
|
u64 *consumer_tail,
|
|
u64 *producer_head)
|
|
{
|
|
struct vmci_queue_header *produce_q_header;
|
|
struct vmci_queue_header *consume_q_header;
|
|
int result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
result =
|
|
qp_get_queue_headers(qpair, &produce_q_header, &consume_q_header);
|
|
if (result == VMCI_SUCCESS)
|
|
vmci_q_header_get_pointers(consume_q_header, produce_q_header,
|
|
consumer_tail, producer_head);
|
|
qp_unlock(qpair);
|
|
|
|
if (result == VMCI_SUCCESS &&
|
|
((consumer_tail && *consumer_tail >= qpair->consume_q_size) ||
|
|
(producer_head && *producer_head >= qpair->consume_q_size)))
|
|
return VMCI_ERROR_INVALID_SIZE;
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_get_consume_indexes);
|
|
|
|
/*
|
|
* vmci_qpair_produce_free_space() - Retrieves free space in producer queue.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
*
|
|
* This is the client interface for getting the amount of free
|
|
* space in the QPair from the point of the view of the caller as
|
|
* the producer which is the common case. Returns < 0 if err, else
|
|
* available bytes into which data can be enqueued if > 0.
|
|
*/
|
|
s64 vmci_qpair_produce_free_space(const struct vmci_qp *qpair)
|
|
{
|
|
struct vmci_queue_header *produce_q_header;
|
|
struct vmci_queue_header *consume_q_header;
|
|
s64 result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
result =
|
|
qp_get_queue_headers(qpair, &produce_q_header, &consume_q_header);
|
|
if (result == VMCI_SUCCESS)
|
|
result = vmci_q_header_free_space(produce_q_header,
|
|
consume_q_header,
|
|
qpair->produce_q_size);
|
|
else
|
|
result = 0;
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_produce_free_space);
|
|
|
|
/*
|
|
* vmci_qpair_consume_free_space() - Retrieves free space in consumer queue.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
*
|
|
* This is the client interface for getting the amount of free
|
|
* space in the QPair from the point of the view of the caller as
|
|
* the consumer which is not the common case. Returns < 0 if err, else
|
|
* available bytes into which data can be enqueued if > 0.
|
|
*/
|
|
s64 vmci_qpair_consume_free_space(const struct vmci_qp *qpair)
|
|
{
|
|
struct vmci_queue_header *produce_q_header;
|
|
struct vmci_queue_header *consume_q_header;
|
|
s64 result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
result =
|
|
qp_get_queue_headers(qpair, &produce_q_header, &consume_q_header);
|
|
if (result == VMCI_SUCCESS)
|
|
result = vmci_q_header_free_space(consume_q_header,
|
|
produce_q_header,
|
|
qpair->consume_q_size);
|
|
else
|
|
result = 0;
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_consume_free_space);
|
|
|
|
/*
|
|
* vmci_qpair_produce_buf_ready() - Gets bytes ready to read from
|
|
* producer queue.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
*
|
|
* This is the client interface for getting the amount of
|
|
* enqueued data in the QPair from the point of the view of the
|
|
* caller as the producer which is not the common case. Returns < 0 if err,
|
|
* else available bytes that may be read.
|
|
*/
|
|
s64 vmci_qpair_produce_buf_ready(const struct vmci_qp *qpair)
|
|
{
|
|
struct vmci_queue_header *produce_q_header;
|
|
struct vmci_queue_header *consume_q_header;
|
|
s64 result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
result =
|
|
qp_get_queue_headers(qpair, &produce_q_header, &consume_q_header);
|
|
if (result == VMCI_SUCCESS)
|
|
result = vmci_q_header_buf_ready(produce_q_header,
|
|
consume_q_header,
|
|
qpair->produce_q_size);
|
|
else
|
|
result = 0;
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_produce_buf_ready);
|
|
|
|
/*
|
|
* vmci_qpair_consume_buf_ready() - Gets bytes ready to read from
|
|
* consumer queue.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
*
|
|
* This is the client interface for getting the amount of
|
|
* enqueued data in the QPair from the point of the view of the
|
|
* caller as the consumer which is the normal case. Returns < 0 if err,
|
|
* else available bytes that may be read.
|
|
*/
|
|
s64 vmci_qpair_consume_buf_ready(const struct vmci_qp *qpair)
|
|
{
|
|
struct vmci_queue_header *produce_q_header;
|
|
struct vmci_queue_header *consume_q_header;
|
|
s64 result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
result =
|
|
qp_get_queue_headers(qpair, &produce_q_header, &consume_q_header);
|
|
if (result == VMCI_SUCCESS)
|
|
result = vmci_q_header_buf_ready(consume_q_header,
|
|
produce_q_header,
|
|
qpair->consume_q_size);
|
|
else
|
|
result = 0;
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_consume_buf_ready);
|
|
|
|
/*
|
|
* vmci_qpair_enqueue() - Throw data on the queue.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
* @buf: Pointer to buffer containing data
|
|
* @buf_size: Length of buffer.
|
|
* @buf_type: Buffer type (Unused).
|
|
*
|
|
* This is the client interface for enqueueing data into the queue.
|
|
* Returns number of bytes enqueued or < 0 on error.
|
|
*/
|
|
ssize_t vmci_qpair_enqueue(struct vmci_qp *qpair,
|
|
const void *buf,
|
|
size_t buf_size,
|
|
int buf_type)
|
|
{
|
|
ssize_t result;
|
|
struct iov_iter from;
|
|
struct kvec v = {.iov_base = (void *)buf, .iov_len = buf_size};
|
|
|
|
if (!qpair || !buf)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
iov_iter_kvec(&from, WRITE, &v, 1, buf_size);
|
|
|
|
qp_lock(qpair);
|
|
|
|
do {
|
|
result = qp_enqueue_locked(qpair->produce_q,
|
|
qpair->consume_q,
|
|
qpair->produce_q_size,
|
|
&from);
|
|
|
|
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
|
|
!qp_wait_for_ready_queue(qpair))
|
|
result = VMCI_ERROR_WOULD_BLOCK;
|
|
|
|
} while (result == VMCI_ERROR_QUEUEPAIR_NOT_READY);
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_enqueue);
|
|
|
|
/*
|
|
* vmci_qpair_dequeue() - Get data from the queue.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
* @buf: Pointer to buffer for the data
|
|
* @buf_size: Length of buffer.
|
|
* @buf_type: Buffer type (Unused).
|
|
*
|
|
* This is the client interface for dequeueing data from the queue.
|
|
* Returns number of bytes dequeued or < 0 on error.
|
|
*/
|
|
ssize_t vmci_qpair_dequeue(struct vmci_qp *qpair,
|
|
void *buf,
|
|
size_t buf_size,
|
|
int buf_type)
|
|
{
|
|
ssize_t result;
|
|
struct iov_iter to;
|
|
struct kvec v = {.iov_base = buf, .iov_len = buf_size};
|
|
|
|
if (!qpair || !buf)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
iov_iter_kvec(&to, READ, &v, 1, buf_size);
|
|
|
|
qp_lock(qpair);
|
|
|
|
do {
|
|
result = qp_dequeue_locked(qpair->produce_q,
|
|
qpair->consume_q,
|
|
qpair->consume_q_size,
|
|
&to, true);
|
|
|
|
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
|
|
!qp_wait_for_ready_queue(qpair))
|
|
result = VMCI_ERROR_WOULD_BLOCK;
|
|
|
|
} while (result == VMCI_ERROR_QUEUEPAIR_NOT_READY);
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_dequeue);
|
|
|
|
/*
|
|
* vmci_qpair_peek() - Peek at the data in the queue.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
* @buf: Pointer to buffer for the data
|
|
* @buf_size: Length of buffer.
|
|
* @buf_type: Buffer type (Unused on Linux).
|
|
*
|
|
* This is the client interface for peeking into a queue. (I.e.,
|
|
* copy data from the queue without updating the head pointer.)
|
|
* Returns number of bytes dequeued or < 0 on error.
|
|
*/
|
|
ssize_t vmci_qpair_peek(struct vmci_qp *qpair,
|
|
void *buf,
|
|
size_t buf_size,
|
|
int buf_type)
|
|
{
|
|
struct iov_iter to;
|
|
struct kvec v = {.iov_base = buf, .iov_len = buf_size};
|
|
ssize_t result;
|
|
|
|
if (!qpair || !buf)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
iov_iter_kvec(&to, READ, &v, 1, buf_size);
|
|
|
|
qp_lock(qpair);
|
|
|
|
do {
|
|
result = qp_dequeue_locked(qpair->produce_q,
|
|
qpair->consume_q,
|
|
qpair->consume_q_size,
|
|
&to, false);
|
|
|
|
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
|
|
!qp_wait_for_ready_queue(qpair))
|
|
result = VMCI_ERROR_WOULD_BLOCK;
|
|
|
|
} while (result == VMCI_ERROR_QUEUEPAIR_NOT_READY);
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_peek);
|
|
|
|
/*
|
|
* vmci_qpair_enquev() - Throw data on the queue using iov.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
* @iov: Pointer to buffer containing data
|
|
* @iov_size: Length of buffer.
|
|
* @buf_type: Buffer type (Unused).
|
|
*
|
|
* This is the client interface for enqueueing data into the queue.
|
|
* This function uses IO vectors to handle the work. Returns number
|
|
* of bytes enqueued or < 0 on error.
|
|
*/
|
|
ssize_t vmci_qpair_enquev(struct vmci_qp *qpair,
|
|
struct msghdr *msg,
|
|
size_t iov_size,
|
|
int buf_type)
|
|
{
|
|
ssize_t result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
|
|
do {
|
|
result = qp_enqueue_locked(qpair->produce_q,
|
|
qpair->consume_q,
|
|
qpair->produce_q_size,
|
|
&msg->msg_iter);
|
|
|
|
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
|
|
!qp_wait_for_ready_queue(qpair))
|
|
result = VMCI_ERROR_WOULD_BLOCK;
|
|
|
|
} while (result == VMCI_ERROR_QUEUEPAIR_NOT_READY);
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_enquev);
|
|
|
|
/*
|
|
* vmci_qpair_dequev() - Get data from the queue using iov.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
* @iov: Pointer to buffer for the data
|
|
* @iov_size: Length of buffer.
|
|
* @buf_type: Buffer type (Unused).
|
|
*
|
|
* This is the client interface for dequeueing data from the queue.
|
|
* This function uses IO vectors to handle the work. Returns number
|
|
* of bytes dequeued or < 0 on error.
|
|
*/
|
|
ssize_t vmci_qpair_dequev(struct vmci_qp *qpair,
|
|
struct msghdr *msg,
|
|
size_t iov_size,
|
|
int buf_type)
|
|
{
|
|
ssize_t result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
|
|
do {
|
|
result = qp_dequeue_locked(qpair->produce_q,
|
|
qpair->consume_q,
|
|
qpair->consume_q_size,
|
|
&msg->msg_iter, true);
|
|
|
|
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
|
|
!qp_wait_for_ready_queue(qpair))
|
|
result = VMCI_ERROR_WOULD_BLOCK;
|
|
|
|
} while (result == VMCI_ERROR_QUEUEPAIR_NOT_READY);
|
|
|
|
qp_unlock(qpair);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_dequev);
|
|
|
|
/*
|
|
* vmci_qpair_peekv() - Peek at the data in the queue using iov.
|
|
* @qpair: Pointer to the queue pair struct.
|
|
* @iov: Pointer to buffer for the data
|
|
* @iov_size: Length of buffer.
|
|
* @buf_type: Buffer type (Unused on Linux).
|
|
*
|
|
* This is the client interface for peeking into a queue. (I.e.,
|
|
* copy data from the queue without updating the head pointer.)
|
|
* This function uses IO vectors to handle the work. Returns number
|
|
* of bytes peeked or < 0 on error.
|
|
*/
|
|
ssize_t vmci_qpair_peekv(struct vmci_qp *qpair,
|
|
struct msghdr *msg,
|
|
size_t iov_size,
|
|
int buf_type)
|
|
{
|
|
ssize_t result;
|
|
|
|
if (!qpair)
|
|
return VMCI_ERROR_INVALID_ARGS;
|
|
|
|
qp_lock(qpair);
|
|
|
|
do {
|
|
result = qp_dequeue_locked(qpair->produce_q,
|
|
qpair->consume_q,
|
|
qpair->consume_q_size,
|
|
&msg->msg_iter, false);
|
|
|
|
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
|
|
!qp_wait_for_ready_queue(qpair))
|
|
result = VMCI_ERROR_WOULD_BLOCK;
|
|
|
|
} while (result == VMCI_ERROR_QUEUEPAIR_NOT_READY);
|
|
|
|
qp_unlock(qpair);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmci_qpair_peekv);
|