virt: acrn: Introduce EPT mapping management
The HSM provides hypervisor services to the ACRN userspace. While
launching a User VM, ACRN userspace needs to allocate memory and request
the ACRN Hypervisor to set up the EPT mapping for the VM.
A mapping cache is introduced for accelerating the translation between
the Service VM kernel virtual address and User VM physical address.
>From the perspective of the hypervisor, the types of GPA of User VM can be
listed as following:
1) RAM region, which is used by User VM as system ram.
2) MMIO region, which is recognized by User VM as MMIO. MMIO region is
used to be utilized for devices emulation.
Generally, User VM RAM regions mapping is set up before VM started and
is released in the User VM destruction. MMIO regions mapping may be set
and unset dynamically during User VM running.
To achieve this, ioctls ACRN_IOCTL_SET_MEMSEG and ACRN_IOCTL_UNSET_MEMSEG
are introduced in HSM.
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-9-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuo Liu
Greg Kroah-Hartman
parent
2ad2aaee1b
commit
88f537d5e8
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@ -1,3 +1,3 @@
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# SPDX-License-Identifier: GPL-2.0
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obj-$(CONFIG_ACRN_HSM) := acrn.o
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acrn-y := hsm.o vm.o
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acrn-y := hsm.o vm.o mm.o
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@ -12,26 +12,104 @@
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extern struct miscdevice acrn_dev;
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#define ACRN_MEM_MAPPING_MAX 256
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#define ACRN_MEM_REGION_ADD 0
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#define ACRN_MEM_REGION_DEL 2
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/**
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* struct vm_memory_region_op - Hypervisor memory operation
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* @type: Operation type (ACRN_MEM_REGION_*)
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* @attr: Memory attribute (ACRN_MEM_TYPE_* | ACRN_MEM_ACCESS_*)
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* @user_vm_pa: Physical address of User VM to be mapped.
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* @service_vm_pa: Physical address of Service VM to be mapped.
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* @size: Size of this region.
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*
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* Structure containing needed information that is provided to ACRN Hypervisor
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* to manage the EPT mappings of a single memory region of the User VM. Several
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* &struct vm_memory_region_op can be batched to ACRN Hypervisor, see &struct
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* vm_memory_region_batch.
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*/
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struct vm_memory_region_op {
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u32 type;
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u32 attr;
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u64 user_vm_pa;
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u64 service_vm_pa;
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u64 size;
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};
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/**
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* struct vm_memory_region_batch - A batch of vm_memory_region_op.
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* @vmid: A User VM ID.
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* @reserved: Reserved.
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* @regions_num: The number of vm_memory_region_op.
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* @regions_gpa: Physical address of a vm_memory_region_op array.
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*
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* HC_VM_SET_MEMORY_REGIONS uses this structure to manage EPT mappings of
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* multiple memory regions of a User VM. A &struct vm_memory_region_batch
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* contains multiple &struct vm_memory_region_op for batch processing in the
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* ACRN Hypervisor.
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*/
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struct vm_memory_region_batch {
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u16 vmid;
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u16 reserved[3];
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u32 regions_num;
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u64 regions_gpa;
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};
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/**
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* struct vm_memory_mapping - Memory map between a User VM and the Service VM
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* @pages: Pages in Service VM kernel.
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* @npages: Number of pages.
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* @service_vm_va: Virtual address in Service VM kernel.
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* @user_vm_pa: Physical address in User VM.
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* @size: Size of this memory region.
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*
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* HSM maintains memory mappings between a User VM GPA and the Service VM
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* kernel VA for accelerating the User VM GPA translation.
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*/
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struct vm_memory_mapping {
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struct page **pages;
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int npages;
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void *service_vm_va;
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u64 user_vm_pa;
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size_t size;
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};
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#define ACRN_INVALID_VMID (0xffffU)
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#define ACRN_VM_FLAG_DESTROYED 0U
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/**
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* struct acrn_vm - Properties of ACRN User VM.
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* @list: Entry within global list of all VMs
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* @vmid: User VM ID
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* @vcpu_num: Number of virtual CPUs in the VM
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* @flags: Flags (ACRN_VM_FLAG_*) of the VM. This is VM flag management
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* in HSM which is different from the &acrn_vm_creation.vm_flag.
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* @list: Entry within global list of all VMs.
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* @vmid: User VM ID.
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* @vcpu_num: Number of virtual CPUs in the VM.
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* @flags: Flags (ACRN_VM_FLAG_*) of the VM. This is VM
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* flag management in HSM which is different
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* from the &acrn_vm_creation.vm_flag.
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* @regions_mapping_lock: Lock to protect &acrn_vm.regions_mapping and
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* &acrn_vm.regions_mapping_count.
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* @regions_mapping: Memory mappings of this VM.
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* @regions_mapping_count: Number of memory mapping of this VM.
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*/
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struct acrn_vm {
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struct list_head list;
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u16 vmid;
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int vcpu_num;
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unsigned long flags;
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struct list_head list;
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u16 vmid;
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int vcpu_num;
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unsigned long flags;
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struct mutex regions_mapping_lock;
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struct vm_memory_mapping regions_mapping[ACRN_MEM_MAPPING_MAX];
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int regions_mapping_count;
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};
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struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
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struct acrn_vm_creation *vm_param);
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int acrn_vm_destroy(struct acrn_vm *vm);
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int acrn_mm_region_add(struct acrn_vm *vm, u64 user_gpa, u64 service_gpa,
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u64 size, u32 mem_type, u32 mem_access_right);
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int acrn_mm_region_del(struct acrn_vm *vm, u64 user_gpa, u64 size);
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int acrn_vm_memseg_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap);
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int acrn_vm_memseg_unmap(struct acrn_vm *vm, struct acrn_vm_memmap *memmap);
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int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap);
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void acrn_vm_all_ram_unmap(struct acrn_vm *vm);
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#endif /* __ACRN_HSM_DRV_H */
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@ -48,6 +48,7 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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struct acrn_vm *vm = filp->private_data;
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struct acrn_vm_creation *vm_param;
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struct acrn_vcpu_regs *cpu_regs;
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struct acrn_vm_memmap memmap;
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int i, ret = 0;
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if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) {
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@ -132,6 +133,20 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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vm->vmid);
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kfree(cpu_regs);
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break;
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case ACRN_IOCTL_SET_MEMSEG:
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if (copy_from_user(&memmap, (void __user *)ioctl_param,
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sizeof(memmap)))
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return -EFAULT;
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ret = acrn_vm_memseg_map(vm, &memmap);
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break;
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case ACRN_IOCTL_UNSET_MEMSEG:
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if (copy_from_user(&memmap, (void __user *)ioctl_param,
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sizeof(memmap)))
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return -EFAULT;
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ret = acrn_vm_memseg_unmap(vm, &memmap);
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break;
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default:
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dev_dbg(acrn_dev.this_device, "Unknown IOCTL 0x%x!\n", cmd);
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ret = -ENOTTY;
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@ -21,6 +21,9 @@
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#define HC_RESET_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x05)
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#define HC_SET_VCPU_REGS _HC_ID(HC_ID, HC_ID_VM_BASE + 0x06)
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#define HC_ID_MEM_BASE 0x40UL
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#define HC_VM_SET_MEMORY_REGIONS _HC_ID(HC_ID, HC_ID_MEM_BASE + 0x02)
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/**
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* hcall_create_vm() - Create a User VM
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* @vminfo: Service VM GPA of info of User VM creation
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@ -88,4 +91,15 @@ static inline long hcall_set_vcpu_regs(u64 vmid, u64 regs_state)
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return acrn_hypercall2(HC_SET_VCPU_REGS, vmid, regs_state);
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}
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/**
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* hcall_set_memory_regions() - Inform the hypervisor to set up EPT mappings
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* @regions_pa: Service VM GPA of &struct vm_memory_region_batch
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_set_memory_regions(u64 regions_pa)
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{
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return acrn_hypercall1(HC_VM_SET_MEMORY_REGIONS, regions_pa);
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}
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#endif /* __ACRN_HSM_HYPERCALL_H */
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@ -0,0 +1,306 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ACRN: Memory mapping management
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*
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* Copyright (C) 2020 Intel Corporation. All rights reserved.
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*
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* Authors:
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* Fei Li <lei1.li@intel.com>
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* Shuo Liu <shuo.a.liu@intel.com>
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*/
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include "acrn_drv.h"
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static int modify_region(struct acrn_vm *vm, struct vm_memory_region_op *region)
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{
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struct vm_memory_region_batch *regions;
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int ret;
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regions = kzalloc(sizeof(*regions), GFP_KERNEL);
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if (!regions)
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return -ENOMEM;
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regions->vmid = vm->vmid;
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regions->regions_num = 1;
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regions->regions_gpa = virt_to_phys(region);
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ret = hcall_set_memory_regions(virt_to_phys(regions));
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Failed to set memory region for VM[%u]!\n", vm->vmid);
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kfree(regions);
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return ret;
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}
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/**
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* acrn_mm_region_add() - Set up the EPT mapping of a memory region.
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* @vm: User VM.
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* @user_gpa: A GPA of User VM.
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* @service_gpa: A GPA of Service VM.
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* @size: Size of the region.
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* @mem_type: Combination of ACRN_MEM_TYPE_*.
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* @mem_access_right: Combination of ACRN_MEM_ACCESS_*.
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*
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* Return: 0 on success, <0 on error.
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*/
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int acrn_mm_region_add(struct acrn_vm *vm, u64 user_gpa, u64 service_gpa,
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u64 size, u32 mem_type, u32 mem_access_right)
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{
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struct vm_memory_region_op *region;
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int ret = 0;
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region = kzalloc(sizeof(*region), GFP_KERNEL);
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if (!region)
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return -ENOMEM;
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region->type = ACRN_MEM_REGION_ADD;
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region->user_vm_pa = user_gpa;
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region->service_vm_pa = service_gpa;
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region->size = size;
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region->attr = ((mem_type & ACRN_MEM_TYPE_MASK) |
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(mem_access_right & ACRN_MEM_ACCESS_RIGHT_MASK));
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ret = modify_region(vm, region);
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dev_dbg(acrn_dev.this_device,
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"%s: user-GPA[%pK] service-GPA[%pK] size[0x%llx].\n",
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__func__, (void *)user_gpa, (void *)service_gpa, size);
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kfree(region);
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return ret;
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}
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/**
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* acrn_mm_region_del() - Del the EPT mapping of a memory region.
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* @vm: User VM.
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* @user_gpa: A GPA of the User VM.
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* @size: Size of the region.
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*
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* Return: 0 on success, <0 for error.
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*/
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int acrn_mm_region_del(struct acrn_vm *vm, u64 user_gpa, u64 size)
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{
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struct vm_memory_region_op *region;
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int ret = 0;
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region = kzalloc(sizeof(*region), GFP_KERNEL);
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if (!region)
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return -ENOMEM;
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region->type = ACRN_MEM_REGION_DEL;
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region->user_vm_pa = user_gpa;
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region->service_vm_pa = 0UL;
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region->size = size;
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region->attr = 0U;
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ret = modify_region(vm, region);
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dev_dbg(acrn_dev.this_device, "%s: user-GPA[%pK] size[0x%llx].\n",
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__func__, (void *)user_gpa, size);
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kfree(region);
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return ret;
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}
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int acrn_vm_memseg_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
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{
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int ret;
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if (memmap->type == ACRN_MEMMAP_RAM)
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return acrn_vm_ram_map(vm, memmap);
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if (memmap->type != ACRN_MEMMAP_MMIO) {
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dev_dbg(acrn_dev.this_device,
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"Invalid memmap type: %u\n", memmap->type);
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return -EINVAL;
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}
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ret = acrn_mm_region_add(vm, memmap->user_vm_pa,
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memmap->service_vm_pa, memmap->len,
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ACRN_MEM_TYPE_UC, memmap->attr);
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Add memory region failed, VM[%u]!\n", vm->vmid);
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return ret;
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}
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int acrn_vm_memseg_unmap(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
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{
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int ret;
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if (memmap->type != ACRN_MEMMAP_MMIO) {
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dev_dbg(acrn_dev.this_device,
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"Invalid memmap type: %u\n", memmap->type);
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return -EINVAL;
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}
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ret = acrn_mm_region_del(vm, memmap->user_vm_pa, memmap->len);
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Del memory region failed, VM[%u]!\n", vm->vmid);
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return ret;
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}
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/**
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* acrn_vm_ram_map() - Create a RAM EPT mapping of User VM.
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* @vm: The User VM pointer
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* @memmap: Info of the EPT mapping
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*
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* Return: 0 on success, <0 for error.
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*/
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int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
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{
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struct vm_memory_region_batch *regions_info;
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int nr_pages, i = 0, order, nr_regions = 0;
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struct vm_memory_mapping *region_mapping;
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struct vm_memory_region_op *vm_region;
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struct page **pages = NULL, *page;
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void *remap_vaddr;
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int ret, pinned;
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u64 user_vm_pa;
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if (!vm || !memmap)
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return -EINVAL;
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/* Get the page number of the map region */
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nr_pages = memmap->len >> PAGE_SHIFT;
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pages = vzalloc(nr_pages * sizeof(struct page *));
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if (!pages)
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return -ENOMEM;
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/* Lock the pages of user memory map region */
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pinned = pin_user_pages_fast(memmap->vma_base,
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nr_pages, FOLL_WRITE | FOLL_LONGTERM,
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pages);
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if (pinned < 0) {
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ret = pinned;
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goto free_pages;
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} else if (pinned != nr_pages) {
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ret = -EFAULT;
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goto put_pages;
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}
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/* Create a kernel map for the map region */
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remap_vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
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if (!remap_vaddr) {
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ret = -ENOMEM;
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goto put_pages;
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}
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/* Record Service VM va <-> User VM pa mapping */
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mutex_lock(&vm->regions_mapping_lock);
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region_mapping = &vm->regions_mapping[vm->regions_mapping_count];
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if (vm->regions_mapping_count < ACRN_MEM_MAPPING_MAX) {
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region_mapping->pages = pages;
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region_mapping->npages = nr_pages;
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region_mapping->size = memmap->len;
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region_mapping->service_vm_va = remap_vaddr;
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region_mapping->user_vm_pa = memmap->user_vm_pa;
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vm->regions_mapping_count++;
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} else {
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dev_warn(acrn_dev.this_device,
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"Run out of memory mapping slots!\n");
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ret = -ENOMEM;
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mutex_unlock(&vm->regions_mapping_lock);
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goto unmap_no_count;
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}
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mutex_unlock(&vm->regions_mapping_lock);
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/* Calculate count of vm_memory_region_op */
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while (i < nr_pages) {
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page = pages[i];
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VM_BUG_ON_PAGE(PageTail(page), page);
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order = compound_order(page);
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nr_regions++;
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i += 1 << order;
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}
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/* Prepare the vm_memory_region_batch */
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regions_info = kzalloc(sizeof(*regions_info) +
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sizeof(*vm_region) * nr_regions,
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GFP_KERNEL);
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if (!regions_info) {
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ret = -ENOMEM;
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goto unmap_kernel_map;
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}
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/* Fill each vm_memory_region_op */
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vm_region = (struct vm_memory_region_op *)(regions_info + 1);
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regions_info->vmid = vm->vmid;
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regions_info->regions_num = nr_regions;
|
||||
regions_info->regions_gpa = virt_to_phys(vm_region);
|
||||
user_vm_pa = memmap->user_vm_pa;
|
||||
i = 0;
|
||||
while (i < nr_pages) {
|
||||
u32 region_size;
|
||||
|
||||
page = pages[i];
|
||||
VM_BUG_ON_PAGE(PageTail(page), page);
|
||||
order = compound_order(page);
|
||||
region_size = PAGE_SIZE << order;
|
||||
vm_region->type = ACRN_MEM_REGION_ADD;
|
||||
vm_region->user_vm_pa = user_vm_pa;
|
||||
vm_region->service_vm_pa = page_to_phys(page);
|
||||
vm_region->size = region_size;
|
||||
vm_region->attr = (ACRN_MEM_TYPE_WB & ACRN_MEM_TYPE_MASK) |
|
||||
(memmap->attr & ACRN_MEM_ACCESS_RIGHT_MASK);
|
||||
|
||||
vm_region++;
|
||||
user_vm_pa += region_size;
|
||||
i += 1 << order;
|
||||
}
|
||||
|
||||
/* Inform the ACRN Hypervisor to set up EPT mappings */
|
||||
ret = hcall_set_memory_regions(virt_to_phys(regions_info));
|
||||
if (ret < 0) {
|
||||
dev_dbg(acrn_dev.this_device,
|
||||
"Failed to set regions, VM[%u]!\n", vm->vmid);
|
||||
goto unset_region;
|
||||
}
|
||||
kfree(regions_info);
|
||||
|
||||
dev_dbg(acrn_dev.this_device,
|
||||
"%s: VM[%u] service-GVA[%pK] user-GPA[%pK] size[0x%llx]\n",
|
||||
__func__, vm->vmid,
|
||||
remap_vaddr, (void *)memmap->user_vm_pa, memmap->len);
|
||||
return ret;
|
||||
|
||||
unset_region:
|
||||
kfree(regions_info);
|
||||
unmap_kernel_map:
|
||||
mutex_lock(&vm->regions_mapping_lock);
|
||||
vm->regions_mapping_count--;
|
||||
mutex_unlock(&vm->regions_mapping_lock);
|
||||
unmap_no_count:
|
||||
vunmap(remap_vaddr);
|
||||
put_pages:
|
||||
for (i = 0; i < pinned; i++)
|
||||
unpin_user_page(pages[i]);
|
||||
free_pages:
|
||||
vfree(pages);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* acrn_vm_all_ram_unmap() - Destroy a RAM EPT mapping of User VM.
|
||||
* @vm: The User VM
|
||||
*/
|
||||
void acrn_vm_all_ram_unmap(struct acrn_vm *vm)
|
||||
{
|
||||
struct vm_memory_mapping *region_mapping;
|
||||
int i, j;
|
||||
|
||||
mutex_lock(&vm->regions_mapping_lock);
|
||||
for (i = 0; i < vm->regions_mapping_count; i++) {
|
||||
region_mapping = &vm->regions_mapping[i];
|
||||
vunmap(region_mapping->service_vm_va);
|
||||
for (j = 0; j < region_mapping->npages; j++)
|
||||
unpin_user_page(region_mapping->pages[j]);
|
||||
vfree(region_mapping->pages);
|
||||
}
|
||||
mutex_unlock(&vm->regions_mapping_lock);
|
||||
}
|
||||
|
|
@ -31,6 +31,7 @@ struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
|
|||
return NULL;
|
||||
}
|
||||
|
||||
mutex_init(&vm->regions_mapping_lock);
|
||||
vm->vmid = vm_param->vmid;
|
||||
vm->vcpu_num = vm_param->vcpu_num;
|
||||
|
||||
|
|
@ -62,6 +63,9 @@ int acrn_vm_destroy(struct acrn_vm *vm)
|
|||
clear_bit(ACRN_VM_FLAG_DESTROYED, &vm->flags);
|
||||
return ret;
|
||||
}
|
||||
|
||||
acrn_vm_all_ram_unmap(vm);
|
||||
|
||||
dev_dbg(acrn_dev.this_device, "VM %u destroyed.\n", vm->vmid);
|
||||
vm->vmid = ACRN_INVALID_VMID;
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -155,6 +155,50 @@ struct acrn_vcpu_regs {
|
|||
struct acrn_regs vcpu_regs;
|
||||
};
|
||||
|
||||
#define ACRN_MEM_ACCESS_RIGHT_MASK 0x00000007U
|
||||
#define ACRN_MEM_ACCESS_READ 0x00000001U
|
||||
#define ACRN_MEM_ACCESS_WRITE 0x00000002U
|
||||
#define ACRN_MEM_ACCESS_EXEC 0x00000004U
|
||||
#define ACRN_MEM_ACCESS_RWX (ACRN_MEM_ACCESS_READ | \
|
||||
ACRN_MEM_ACCESS_WRITE | \
|
||||
ACRN_MEM_ACCESS_EXEC)
|
||||
|
||||
#define ACRN_MEM_TYPE_MASK 0x000007C0U
|
||||
#define ACRN_MEM_TYPE_WB 0x00000040U
|
||||
#define ACRN_MEM_TYPE_WT 0x00000080U
|
||||
#define ACRN_MEM_TYPE_UC 0x00000100U
|
||||
#define ACRN_MEM_TYPE_WC 0x00000200U
|
||||
#define ACRN_MEM_TYPE_WP 0x00000400U
|
||||
|
||||
/* Memory mapping types */
|
||||
#define ACRN_MEMMAP_RAM 0
|
||||
#define ACRN_MEMMAP_MMIO 1
|
||||
|
||||
/**
|
||||
* struct acrn_vm_memmap - A EPT memory mapping info for a User VM.
|
||||
* @type: Type of the memory mapping (ACRM_MEMMAP_*).
|
||||
* Pass to hypervisor directly.
|
||||
* @attr: Attribute of the memory mapping.
|
||||
* Pass to hypervisor directly.
|
||||
* @user_vm_pa: Physical address of User VM.
|
||||
* Pass to hypervisor directly.
|
||||
* @service_vm_pa: Physical address of Service VM.
|
||||
* Pass to hypervisor directly.
|
||||
* @vma_base: VMA address of Service VM. Pass to hypervisor directly.
|
||||
* @len: Length of the memory mapping.
|
||||
* Pass to hypervisor directly.
|
||||
*/
|
||||
struct acrn_vm_memmap {
|
||||
__u32 type;
|
||||
__u32 attr;
|
||||
__u64 user_vm_pa;
|
||||
union {
|
||||
__u64 service_vm_pa;
|
||||
__u64 vma_base;
|
||||
};
|
||||
__u64 len;
|
||||
};
|
||||
|
||||
/* The ioctl type, documented in ioctl-number.rst */
|
||||
#define ACRN_IOCTL_TYPE 0xA2
|
||||
|
||||
|
|
@ -174,4 +218,9 @@ struct acrn_vcpu_regs {
|
|||
#define ACRN_IOCTL_SET_VCPU_REGS \
|
||||
_IOW(ACRN_IOCTL_TYPE, 0x16, struct acrn_vcpu_regs)
|
||||
|
||||
#define ACRN_IOCTL_SET_MEMSEG \
|
||||
_IOW(ACRN_IOCTL_TYPE, 0x41, struct acrn_vm_memmap)
|
||||
#define ACRN_IOCTL_UNSET_MEMSEG \
|
||||
_IOW(ACRN_IOCTL_TYPE, 0x42, struct acrn_vm_memmap)
|
||||
|
||||
#endif /* _UAPI_ACRN_H */
|
||||
|
|
|
|||
Loading…
Reference in New Issue