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// SPDX-License-Identifier: GPL-2.0-only
/*
* Hyper-V specific functions.
*
* Copyright (C) 2021, Red Hat Inc.
*/
#include <stdint.h>
#include "processor.h"
#include "hyperv.h"
const struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void)
{
static struct kvm_cpuid2 *cpuid;
int kvm_fd;
if (cpuid)
return cpuid;
cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
kvm_fd = open_kvm_dev_path_or_exit();
kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
close(kvm_fd);
return cpuid;
}
void vcpu_set_hv_cpuid(struct kvm_vcpu *vcpu)
{
static struct kvm_cpuid2 *cpuid_full;
const struct kvm_cpuid2 *cpuid_sys, *cpuid_hv;
int i, nent = 0;
if (!cpuid_full) {
cpuid_sys = kvm_get_supported_cpuid();
cpuid_hv = kvm_get_supported_hv_cpuid();
cpuid_full = allocate_kvm_cpuid2(cpuid_sys->nent + cpuid_hv->nent);
if (!cpuid_full) {
perror("malloc");
abort();
}
/* Need to skip KVM CPUID leaves 0x400000xx */
for (i = 0; i < cpuid_sys->nent; i++) {
if (cpuid_sys->entries[i].function >= 0x40000000 &&
cpuid_sys->entries[i].function < 0x40000100)
continue;
cpuid_full->entries[nent] = cpuid_sys->entries[i];
nent++;
}
memcpy(&cpuid_full->entries[nent], cpuid_hv->entries,
cpuid_hv->nent * sizeof(struct kvm_cpuid_entry2));
cpuid_full->nent = nent + cpuid_hv->nent;
}
vcpu_init_cpuid(vcpu, cpuid_full);
}
const struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
return cpuid;
}
bool kvm_hv_cpu_has(struct kvm_x86_cpu_feature feature)
{
if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID))
return false;
return kvm_cpuid_has(kvm_get_supported_hv_cpuid(), feature);
}
struct hyperv_test_pages *vcpu_alloc_hyperv_test_pages(struct kvm_vm *vm,
vm_vaddr_t *p_hv_pages_gva)
{
vm_vaddr_t hv_pages_gva = vm_vaddr_alloc_page(vm);
struct hyperv_test_pages *hv = addr_gva2hva(vm, hv_pages_gva);
/* Setup of a region of guest memory for the VP Assist page. */
hv->vp_assist = (void *)vm_vaddr_alloc_page(vm);
hv->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->vp_assist);
hv->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->vp_assist);
/* Setup of a region of guest memory for the partition assist page. */
hv->partition_assist = (void *)vm_vaddr_alloc_page(vm);
hv->partition_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->partition_assist);
hv->partition_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->partition_assist);
/* Setup of a region of guest memory for the enlightened VMCS. */
hv->enlightened_vmcs = (void *)vm_vaddr_alloc_page(vm);
hv->enlightened_vmcs_hva = addr_gva2hva(vm, (uintptr_t)hv->enlightened_vmcs);
hv->enlightened_vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)hv->enlightened_vmcs);
*p_hv_pages_gva = hv_pages_gva;
return hv;
}
int enable_vp_assist(uint64_t vp_assist_pa, void *vp_assist)
{
uint64_t val = (vp_assist_pa & HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK) |
HV_X64_MSR_VP_ASSIST_PAGE_ENABLE;
wrmsr(HV_X64_MSR_VP_ASSIST_PAGE, val);
current_vp_assist = vp_assist;
return 0;
}
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