404 lines
10 KiB
C
404 lines
10 KiB
C
/*
|
|
* Copyright (c) 2009, Microsoft Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
|
* Place - Suite 330, Boston, MA 02111-1307 USA.
|
|
*
|
|
* Authors:
|
|
* Haiyang Zhang <haiyangz@microsoft.com>
|
|
* Hank Janssen <hjanssen@microsoft.com>
|
|
*
|
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/hyperv.h>
|
|
#include <linux/version.h>
|
|
#include <linux/interrupt.h>
|
|
#include <asm/hyperv.h>
|
|
#include "hyperv_vmbus.h"
|
|
|
|
/* The one and only */
|
|
struct hv_context hv_context = {
|
|
.synic_initialized = false,
|
|
.hypercall_page = NULL,
|
|
};
|
|
|
|
/*
|
|
* query_hypervisor_info - Get version info of the windows hypervisor
|
|
*/
|
|
unsigned int host_info_eax;
|
|
unsigned int host_info_ebx;
|
|
unsigned int host_info_ecx;
|
|
unsigned int host_info_edx;
|
|
|
|
static int query_hypervisor_info(void)
|
|
{
|
|
unsigned int eax;
|
|
unsigned int ebx;
|
|
unsigned int ecx;
|
|
unsigned int edx;
|
|
unsigned int max_leaf;
|
|
unsigned int op;
|
|
|
|
/*
|
|
* Its assumed that this is called after confirming that Viridian
|
|
* is present. Query id and revision.
|
|
*/
|
|
eax = 0;
|
|
ebx = 0;
|
|
ecx = 0;
|
|
edx = 0;
|
|
op = HVCPUID_VENDOR_MAXFUNCTION;
|
|
cpuid(op, &eax, &ebx, &ecx, &edx);
|
|
|
|
max_leaf = eax;
|
|
|
|
if (max_leaf >= HVCPUID_VERSION) {
|
|
eax = 0;
|
|
ebx = 0;
|
|
ecx = 0;
|
|
edx = 0;
|
|
op = HVCPUID_VERSION;
|
|
cpuid(op, &eax, &ebx, &ecx, &edx);
|
|
host_info_eax = eax;
|
|
host_info_ebx = ebx;
|
|
host_info_ecx = ecx;
|
|
host_info_edx = edx;
|
|
}
|
|
return max_leaf;
|
|
}
|
|
|
|
/*
|
|
* do_hypercall- Invoke the specified hypercall
|
|
*/
|
|
static u64 do_hypercall(u64 control, void *input, void *output)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
u64 hv_status = 0;
|
|
u64 input_address = (input) ? virt_to_phys(input) : 0;
|
|
u64 output_address = (output) ? virt_to_phys(output) : 0;
|
|
void *hypercall_page = hv_context.hypercall_page;
|
|
|
|
__asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
|
|
__asm__ __volatile__("call *%3" : "=a" (hv_status) :
|
|
"c" (control), "d" (input_address),
|
|
"m" (hypercall_page));
|
|
|
|
return hv_status;
|
|
|
|
#else
|
|
|
|
u32 control_hi = control >> 32;
|
|
u32 control_lo = control & 0xFFFFFFFF;
|
|
u32 hv_status_hi = 1;
|
|
u32 hv_status_lo = 1;
|
|
u64 input_address = (input) ? virt_to_phys(input) : 0;
|
|
u32 input_address_hi = input_address >> 32;
|
|
u32 input_address_lo = input_address & 0xFFFFFFFF;
|
|
u64 output_address = (output) ? virt_to_phys(output) : 0;
|
|
u32 output_address_hi = output_address >> 32;
|
|
u32 output_address_lo = output_address & 0xFFFFFFFF;
|
|
void *hypercall_page = hv_context.hypercall_page;
|
|
|
|
__asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
|
|
"=a"(hv_status_lo) : "d" (control_hi),
|
|
"a" (control_lo), "b" (input_address_hi),
|
|
"c" (input_address_lo), "D"(output_address_hi),
|
|
"S"(output_address_lo), "m" (hypercall_page));
|
|
|
|
return hv_status_lo | ((u64)hv_status_hi << 32);
|
|
#endif /* !x86_64 */
|
|
}
|
|
|
|
/*
|
|
* hv_init - Main initialization routine.
|
|
*
|
|
* This routine must be called before any other routines in here are called
|
|
*/
|
|
int hv_init(void)
|
|
{
|
|
int max_leaf;
|
|
union hv_x64_msr_hypercall_contents hypercall_msr;
|
|
void *virtaddr = NULL;
|
|
|
|
memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
|
|
memset(hv_context.synic_message_page, 0,
|
|
sizeof(void *) * NR_CPUS);
|
|
memset(hv_context.vp_index, 0,
|
|
sizeof(int) * NR_CPUS);
|
|
memset(hv_context.event_dpc, 0,
|
|
sizeof(void *) * NR_CPUS);
|
|
|
|
max_leaf = query_hypervisor_info();
|
|
|
|
/*
|
|
* Write our OS ID.
|
|
*/
|
|
hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
|
|
wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
|
|
|
|
/* See if the hypercall page is already set */
|
|
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
|
|
|
|
virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
|
|
|
|
if (!virtaddr)
|
|
goto cleanup;
|
|
|
|
hypercall_msr.enable = 1;
|
|
|
|
hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
|
|
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
|
|
|
|
/* Confirm that hypercall page did get setup. */
|
|
hypercall_msr.as_uint64 = 0;
|
|
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
|
|
|
|
if (!hypercall_msr.enable)
|
|
goto cleanup;
|
|
|
|
hv_context.hypercall_page = virtaddr;
|
|
|
|
return 0;
|
|
|
|
cleanup:
|
|
if (virtaddr) {
|
|
if (hypercall_msr.enable) {
|
|
hypercall_msr.as_uint64 = 0;
|
|
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
|
|
}
|
|
|
|
vfree(virtaddr);
|
|
}
|
|
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
/*
|
|
* hv_cleanup - Cleanup routine.
|
|
*
|
|
* This routine is called normally during driver unloading or exiting.
|
|
*/
|
|
void hv_cleanup(void)
|
|
{
|
|
union hv_x64_msr_hypercall_contents hypercall_msr;
|
|
|
|
/* Reset our OS id */
|
|
wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
|
|
|
|
if (hv_context.hypercall_page) {
|
|
hypercall_msr.as_uint64 = 0;
|
|
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
|
|
vfree(hv_context.hypercall_page);
|
|
hv_context.hypercall_page = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* hv_post_message - Post a message using the hypervisor message IPC.
|
|
*
|
|
* This involves a hypercall.
|
|
*/
|
|
int hv_post_message(union hv_connection_id connection_id,
|
|
enum hv_message_type message_type,
|
|
void *payload, size_t payload_size)
|
|
{
|
|
struct aligned_input {
|
|
u64 alignment8;
|
|
struct hv_input_post_message msg;
|
|
};
|
|
|
|
struct hv_input_post_message *aligned_msg;
|
|
u16 status;
|
|
unsigned long addr;
|
|
|
|
if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
|
|
return -EMSGSIZE;
|
|
|
|
addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
|
|
if (!addr)
|
|
return -ENOMEM;
|
|
|
|
aligned_msg = (struct hv_input_post_message *)
|
|
(ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
|
|
|
|
aligned_msg->connectionid = connection_id;
|
|
aligned_msg->message_type = message_type;
|
|
aligned_msg->payload_size = payload_size;
|
|
memcpy((void *)aligned_msg->payload, payload, payload_size);
|
|
|
|
status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
|
|
& 0xFFFF;
|
|
|
|
kfree((void *)addr);
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
/*
|
|
* hv_signal_event -
|
|
* Signal an event on the specified connection using the hypervisor event IPC.
|
|
*
|
|
* This involves a hypercall.
|
|
*/
|
|
u16 hv_signal_event(void *con_id)
|
|
{
|
|
u16 status;
|
|
|
|
status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* hv_synic_init - Initialize the Synthethic Interrupt Controller.
|
|
*
|
|
* If it is already initialized by another entity (ie x2v shim), we need to
|
|
* retrieve the initialized message and event pages. Otherwise, we create and
|
|
* initialize the message and event pages.
|
|
*/
|
|
void hv_synic_init(void *arg)
|
|
{
|
|
u64 version;
|
|
union hv_synic_simp simp;
|
|
union hv_synic_siefp siefp;
|
|
union hv_synic_sint shared_sint;
|
|
union hv_synic_scontrol sctrl;
|
|
u64 vp_index;
|
|
|
|
int cpu = smp_processor_id();
|
|
|
|
if (!hv_context.hypercall_page)
|
|
return;
|
|
|
|
/* Check the version */
|
|
rdmsrl(HV_X64_MSR_SVERSION, version);
|
|
|
|
hv_context.event_dpc[cpu] = kmalloc(sizeof(struct tasklet_struct),
|
|
GFP_ATOMIC);
|
|
if (hv_context.event_dpc[cpu] == NULL) {
|
|
pr_err("Unable to allocate event dpc\n");
|
|
goto cleanup;
|
|
}
|
|
tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu);
|
|
|
|
hv_context.synic_message_page[cpu] =
|
|
(void *)get_zeroed_page(GFP_ATOMIC);
|
|
|
|
if (hv_context.synic_message_page[cpu] == NULL) {
|
|
pr_err("Unable to allocate SYNIC message page\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
hv_context.synic_event_page[cpu] =
|
|
(void *)get_zeroed_page(GFP_ATOMIC);
|
|
|
|
if (hv_context.synic_event_page[cpu] == NULL) {
|
|
pr_err("Unable to allocate SYNIC event page\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Setup the Synic's message page */
|
|
rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
|
|
simp.simp_enabled = 1;
|
|
simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
|
|
>> PAGE_SHIFT;
|
|
|
|
wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
|
|
|
|
/* Setup the Synic's event page */
|
|
rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
|
|
siefp.siefp_enabled = 1;
|
|
siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
|
|
>> PAGE_SHIFT;
|
|
|
|
wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
|
|
|
|
/* Setup the shared SINT. */
|
|
rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
|
|
|
|
shared_sint.as_uint64 = 0;
|
|
shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
|
|
shared_sint.masked = false;
|
|
shared_sint.auto_eoi = true;
|
|
|
|
wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
|
|
|
|
/* Enable the global synic bit */
|
|
rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
|
|
sctrl.enable = 1;
|
|
|
|
wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
|
|
|
|
hv_context.synic_initialized = true;
|
|
|
|
/*
|
|
* Setup the mapping between Hyper-V's notion
|
|
* of cpuid and Linux' notion of cpuid.
|
|
* This array will be indexed using Linux cpuid.
|
|
*/
|
|
rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);
|
|
hv_context.vp_index[cpu] = (u32)vp_index;
|
|
return;
|
|
|
|
cleanup:
|
|
if (hv_context.synic_event_page[cpu])
|
|
free_page((unsigned long)hv_context.synic_event_page[cpu]);
|
|
|
|
if (hv_context.synic_message_page[cpu])
|
|
free_page((unsigned long)hv_context.synic_message_page[cpu]);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* hv_synic_cleanup - Cleanup routine for hv_synic_init().
|
|
*/
|
|
void hv_synic_cleanup(void *arg)
|
|
{
|
|
union hv_synic_sint shared_sint;
|
|
union hv_synic_simp simp;
|
|
union hv_synic_siefp siefp;
|
|
int cpu = smp_processor_id();
|
|
|
|
if (!hv_context.synic_initialized)
|
|
return;
|
|
|
|
rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
|
|
|
|
shared_sint.masked = 1;
|
|
|
|
/* Need to correctly cleanup in the case of SMP!!! */
|
|
/* Disable the interrupt */
|
|
wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
|
|
|
|
rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
|
|
simp.simp_enabled = 0;
|
|
simp.base_simp_gpa = 0;
|
|
|
|
wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
|
|
|
|
rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
|
|
siefp.siefp_enabled = 0;
|
|
siefp.base_siefp_gpa = 0;
|
|
|
|
wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
|
|
|
|
free_page((unsigned long)hv_context.synic_message_page[cpu]);
|
|
free_page((unsigned long)hv_context.synic_event_page[cpu]);
|
|
}
|