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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Hyper-V specific functions.4 *5 * Copyright (C) 2021, Red Hat Inc.6 */7#include <stdint.h>8#include "processor.h"9#include "hyperv.h"10 11const struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void)12{13 static struct kvm_cpuid2 *cpuid;14 int kvm_fd;15 16 if (cpuid)17 return cpuid;18 19 cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);20 kvm_fd = open_kvm_dev_path_or_exit();21 22 kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, cpuid);23 24 close(kvm_fd);25 return cpuid;26}27 28void vcpu_set_hv_cpuid(struct kvm_vcpu *vcpu)29{30 static struct kvm_cpuid2 *cpuid_full;31 const struct kvm_cpuid2 *cpuid_sys, *cpuid_hv;32 int i, nent = 0;33 34 if (!cpuid_full) {35 cpuid_sys = kvm_get_supported_cpuid();36 cpuid_hv = kvm_get_supported_hv_cpuid();37 38 cpuid_full = allocate_kvm_cpuid2(cpuid_sys->nent + cpuid_hv->nent);39 if (!cpuid_full) {40 perror("malloc");41 abort();42 }43 44 /* Need to skip KVM CPUID leaves 0x400000xx */45 for (i = 0; i < cpuid_sys->nent; i++) {46 if (cpuid_sys->entries[i].function >= 0x40000000 &&47 cpuid_sys->entries[i].function < 0x40000100)48 continue;49 cpuid_full->entries[nent] = cpuid_sys->entries[i];50 nent++;51 }52 53 memcpy(&cpuid_full->entries[nent], cpuid_hv->entries,54 cpuid_hv->nent * sizeof(struct kvm_cpuid_entry2));55 cpuid_full->nent = nent + cpuid_hv->nent;56 }57 58 vcpu_init_cpuid(vcpu, cpuid_full);59}60 61const struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vcpu *vcpu)62{63 struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);64 65 vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, cpuid);66 67 return cpuid;68}69 70bool kvm_hv_cpu_has(struct kvm_x86_cpu_feature feature)71{72 if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID))73 return false;74 75 return kvm_cpuid_has(kvm_get_supported_hv_cpuid(), feature);76}77 78struct hyperv_test_pages *vcpu_alloc_hyperv_test_pages(struct kvm_vm *vm,79 vm_vaddr_t *p_hv_pages_gva)80{81 vm_vaddr_t hv_pages_gva = vm_vaddr_alloc_page(vm);82 struct hyperv_test_pages *hv = addr_gva2hva(vm, hv_pages_gva);83 84 /* Setup of a region of guest memory for the VP Assist page. */85 hv->vp_assist = (void *)vm_vaddr_alloc_page(vm);86 hv->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->vp_assist);87 hv->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->vp_assist);88 89 /* Setup of a region of guest memory for the partition assist page. */90 hv->partition_assist = (void *)vm_vaddr_alloc_page(vm);91 hv->partition_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->partition_assist);92 hv->partition_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->partition_assist);93 94 /* Setup of a region of guest memory for the enlightened VMCS. */95 hv->enlightened_vmcs = (void *)vm_vaddr_alloc_page(vm);96 hv->enlightened_vmcs_hva = addr_gva2hva(vm, (uintptr_t)hv->enlightened_vmcs);97 hv->enlightened_vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)hv->enlightened_vmcs);98 99 *p_hv_pages_gva = hv_pages_gva;100 return hv;101}102 103int enable_vp_assist(uint64_t vp_assist_pa, void *vp_assist)104{105 uint64_t val = (vp_assist_pa & HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK) |106 HV_X64_MSR_VP_ASSIST_PAGE_ENABLE;107 108 wrmsr(HV_X64_MSR_VP_ASSIST_PAGE, val);109 110 current_vp_assist = vp_assist;111 112 return 0;113}114