arch/x86/kvm/hyperv.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * KVM Microsoft Hyper-V emulation
   4  *
   5  * derived from arch/x86/kvm/x86.c
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  * Copyright (C) 2008 Qumranet, Inc.
   9  * Copyright IBM Corporation, 2008
  10  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  11  * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
  12  *
  13  * Authors:
  14  *   Avi Kivity   <avi@qumranet.com>
  15  *   Yaniv Kamay  <yaniv@qumranet.com>
  16  *   Amit Shah    <amit.shah@qumranet.com>
  17  *   Ben-Ami Yassour <benami@il.ibm.com>
  18  *   Andrey Smetanin <asmetanin@virtuozzo.com>
  19  */
  20
  21 #ifndef __ARCH_X86_KVM_HYPERV_H__
  22 #define __ARCH_X86_KVM_HYPERV_H__
  23
  24 #include <linux/kvm_host.h>
  25 #include "x86.h"
  26
  27 /* "Hv#1" signature */
  28 #define HYPERV_CPUID_SIGNATURE_EAX 0x31237648
  29
  30 /*
  31  * The #defines related to the synthetic debugger are required by KDNet, but
  32  * they are not documented in the Hyper-V TLFS because the synthetic debugger
  33  * functionality has been deprecated and is subject to removal in future
  34  * versions of Windows.
  35  */
  36 #define HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS    0x40000080
  37 #define HYPERV_CPUID_SYNDBG_INTERFACE                   0x40000081
  38 #define HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES       0x40000082
  39
  40 /*
  41  * Hyper-V synthetic debugger platform capabilities
  42  * These are HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX bits.
  43  */
  44 #define HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING        BIT(1)
  45
  46 /* Hyper-V Synthetic debug options MSR */
  47 #define HV_X64_MSR_SYNDBG_CONTROL               0x400000F1
  48 #define HV_X64_MSR_SYNDBG_STATUS                0x400000F2
  49 #define HV_X64_MSR_SYNDBG_SEND_BUFFER           0x400000F3
  50 #define HV_X64_MSR_SYNDBG_RECV_BUFFER           0x400000F4
  51 #define HV_X64_MSR_SYNDBG_PENDING_BUFFER        0x400000F5
  52 #define HV_X64_MSR_SYNDBG_OPTIONS               0x400000FF
  53
  54 /* Hyper-V HV_X64_MSR_SYNDBG_OPTIONS bits */
  55 #define HV_X64_SYNDBG_OPTION_USE_HCALLS         BIT(2)
  56
  57 static inline struct kvm_hv *to_kvm_hv(struct kvm *kvm)
  58 {
  59         return &kvm->arch.hyperv;
  60 }
  61
  62 static inline struct kvm_vcpu_hv *to_hv_vcpu(struct kvm_vcpu *vcpu)
  63 {
  64         return vcpu->arch.hyperv;
  65 }
  66
  67 static inline struct kvm_vcpu_hv_synic *to_hv_synic(struct kvm_vcpu *vcpu)
  68 {
  69         struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
  70
  71         return &hv_vcpu->synic;
  72 }
  73
  74 static inline struct kvm_vcpu *hv_synic_to_vcpu(struct kvm_vcpu_hv_synic *synic)
  75 {
  76         struct kvm_vcpu_hv *hv_vcpu = container_of(synic, struct kvm_vcpu_hv, synic);
  77
  78         return hv_vcpu->vcpu;
  79 }
  80
  81 static inline struct kvm_hv_syndbg *to_hv_syndbg(struct kvm_vcpu *vcpu)
  82 {
  83         return &vcpu->kvm->arch.hyperv.hv_syndbg;
  84 }
  85
  86 static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu)
  87 {
  88         struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
  89
  90         return hv_vcpu ? hv_vcpu->vp_index : vcpu->vcpu_idx;
  91 }
  92
  93 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host);
  94 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host);
  95
  96 static inline bool kvm_hv_hypercall_enabled(struct kvm_vcpu *vcpu)
  97 {
  98         return vcpu->arch.hyperv_enabled && to_kvm_hv(vcpu->kvm)->hv_guest_os_id;
  99 }
 100
 101 int kvm_hv_hypercall(struct kvm_vcpu *vcpu);
 102
 103 void kvm_hv_irq_routing_update(struct kvm *kvm);
 104 int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint);
 105 void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector);
 106 int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages);
 107
 108 void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu);
 109
 110 bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu);
 111 int kvm_hv_get_assist_page(struct kvm_vcpu *vcpu);
 112
 113 static inline struct kvm_vcpu_hv_stimer *to_hv_stimer(struct kvm_vcpu *vcpu,
 114                                                       int timer_index)
 115 {
 116         return &to_hv_vcpu(vcpu)->stimer[timer_index];
 117 }
 118
 119 static inline struct kvm_vcpu *hv_stimer_to_vcpu(struct kvm_vcpu_hv_stimer *stimer)
 120 {
 121         struct kvm_vcpu_hv *hv_vcpu;
 122
 123         hv_vcpu = container_of(stimer - stimer->index, struct kvm_vcpu_hv,
 124                                stimer[0]);
 125         return hv_vcpu->vcpu;
 126 }
 127
 128 static inline bool kvm_hv_has_stimer_pending(struct kvm_vcpu *vcpu)
 129 {
 130         struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 131
 132         if (!hv_vcpu)
 133                 return false;
 134
 135         return !bitmap_empty(hv_vcpu->stimer_pending_bitmap,
 136                              HV_SYNIC_STIMER_COUNT);
 137 }
 138
 139 /*
 140  * With HV_ACCESS_TSC_INVARIANT feature, invariant TSC (CPUID.80000007H:EDX[8])
 141  * is only observed after HV_X64_MSR_TSC_INVARIANT_CONTROL was written to.
 142  */
 143 static inline bool kvm_hv_invtsc_suppressed(struct kvm_vcpu *vcpu)
 144 {
 145         struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 146
 147         /*
 148          * If Hyper-V's invariant TSC control is not exposed to the guest,
 149          * the invariant TSC CPUID flag is not suppressed, Windows guests were
 150          * observed to be able to handle it correctly. Going forward, VMMs are
 151          * encouraged to enable Hyper-V's invariant TSC control when invariant
 152          * TSC CPUID flag is set to make KVM's behavior match genuine Hyper-V.
 153          */
 154         if (!hv_vcpu ||
 155             !(hv_vcpu->cpuid_cache.features_eax & HV_ACCESS_TSC_INVARIANT))
 156                 return false;
 157
 158         /*
 159          * If Hyper-V's invariant TSC control is exposed to the guest, KVM is
 160          * responsible for suppressing the invariant TSC CPUID flag if the
 161          * Hyper-V control is not enabled.
 162          */
 163         return !(to_kvm_hv(vcpu->kvm)->hv_invtsc_control & HV_EXPOSE_INVARIANT_TSC);
 164 }
 165
 166 void kvm_hv_process_stimers(struct kvm_vcpu *vcpu);
 167
 168 void kvm_hv_setup_tsc_page(struct kvm *kvm,
 169                            struct pvclock_vcpu_time_info *hv_clock);
 170 void kvm_hv_request_tsc_page_update(struct kvm *kvm);
 171
 172 void kvm_hv_init_vm(struct kvm *kvm);
 173 void kvm_hv_destroy_vm(struct kvm *kvm);
 174 int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu);
 175 void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu, bool hyperv_enabled);
 176 int kvm_hv_set_enforce_cpuid(struct kvm_vcpu *vcpu, bool enforce);
 177 int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args);
 178 int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
 179                      struct kvm_cpuid_entry2 __user *entries);
 180
 181 static inline struct kvm_vcpu_hv_tlb_flush_fifo *kvm_hv_get_tlb_flush_fifo(struct kvm_vcpu *vcpu,
 182                                                                            bool is_guest_mode)
 183 {
 184         struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 185         int i = is_guest_mode ? HV_L2_TLB_FLUSH_FIFO :
 186                                 HV_L1_TLB_FLUSH_FIFO;
 187
 188         return &hv_vcpu->tlb_flush_fifo[i];
 189 }
 190
 191 static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu)
 192 {
 193         struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo;
 194
 195         if (!to_hv_vcpu(vcpu) || !kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu))
 196                 return;
 197
 198         tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu, is_guest_mode(vcpu));
 199
 200         kfifo_reset_out(&tlb_flush_fifo->entries);
 201 }
 202
 203 static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu)
 204 {
 205         struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 206
 207         return hv_vcpu &&
 208                 (hv_vcpu->cpuid_cache.nested_eax & HV_X64_NESTED_DIRECT_FLUSH);
 209 }
 210
 211 static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu)
 212 {
 213         struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 214         u16 code;
 215
 216         if (!hv_vcpu)
 217                 return false;
 218
 219         code = is_64_bit_hypercall(vcpu) ? kvm_rcx_read(vcpu) :
 220                                            kvm_rax_read(vcpu);
 221
 222         return (code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE ||
 223                 code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST ||
 224                 code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX ||
 225                 code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX);
 226 }
 227
 228 static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu)
 229 {
 230         if (!to_hv_vcpu(vcpu))
 231                 return 0;
 232
 233         if (!kvm_hv_assist_page_enabled(vcpu))
 234                 return 0;
 235
 236         return kvm_hv_get_assist_page(vcpu);
 237 }
 238
 239 int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);
 240
 241 #endif