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 void kvm_hv_process_stimers(struct kvm_vcpu *vcpu); 140 141 void kvm_hv_setup_tsc_page(struct kvm *kvm, 142 struct pvclock_vcpu_time_info *hv_clock); 143 void kvm_hv_request_tsc_page_update(struct kvm *kvm); 144 145 void kvm_hv_init_vm(struct kvm *kvm); 146 void kvm_hv_destroy_vm(struct kvm *kvm); 147 int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu); 148 void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu, bool hyperv_enabled); 149 int kvm_hv_set_enforce_cpuid(struct kvm_vcpu *vcpu, bool enforce); 150 int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args); 151 int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, 152 struct kvm_cpuid_entry2 __user *entries); 153 154 static inline struct kvm_vcpu_hv_tlb_flush_fifo *kvm_hv_get_tlb_flush_fifo(struct kvm_vcpu *vcpu, 155 bool is_guest_mode) 156 { 157 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 158 int i = is_guest_mode ? HV_L2_TLB_FLUSH_FIFO : 159 HV_L1_TLB_FLUSH_FIFO; 160 161 return &hv_vcpu->tlb_flush_fifo[i]; 162 } 163 164 static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) 165 { 166 struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; 167 168 if (!to_hv_vcpu(vcpu) || !kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu)) 169 return; 170 171 tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu, is_guest_mode(vcpu)); 172 173 kfifo_reset_out(&tlb_flush_fifo->entries); 174 } 175 176 static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu) 177 { 178 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 179 180 return hv_vcpu && 181 (hv_vcpu->cpuid_cache.nested_eax & HV_X64_NESTED_DIRECT_FLUSH); 182 } 183 184 static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) 185 { 186 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 187 u16 code; 188 189 if (!hv_vcpu) 190 return false; 191 192 code = is_64_bit_hypercall(vcpu) ? kvm_rcx_read(vcpu) : 193 kvm_rax_read(vcpu); 194 195 return (code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE || 196 code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST || 197 code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX || 198 code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX); 199 } 200 201 static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu) 202 { 203 if (!to_hv_vcpu(vcpu)) 204 return 0; 205 206 if (!kvm_hv_assist_page_enabled(vcpu)) 207 return 0; 208 209 return kvm_hv_get_assist_page(vcpu); 210 } 211 212 int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu); 213 214 #endif 215