| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * KVM Microsoft Hyper-V emulation |
| * |
| * derived from arch/x86/kvm/x86.c |
| * |
| * Copyright (C) 2006 Qumranet, Inc. |
| * Copyright (C) 2008 Qumranet, Inc. |
| * Copyright IBM Corporation, 2008 |
| * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
| * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com> |
| * |
| * Authors: |
| * Avi Kivity <avi@qumranet.com> |
| * Yaniv Kamay <yaniv@qumranet.com> |
| * Amit Shah <amit.shah@qumranet.com> |
| * Ben-Ami Yassour <benami@il.ibm.com> |
| * Andrey Smetanin <asmetanin@virtuozzo.com> |
| */ |
| |
| #ifndef __ARCH_X86_KVM_HYPERV_H__ |
| #define __ARCH_X86_KVM_HYPERV_H__ |
| |
| #include <linux/kvm_host.h> |
| #include "x86.h" |
| |
| #ifdef CONFIG_KVM_HYPERV |
| |
| /* "Hv#1" signature */ |
| #define HYPERV_CPUID_SIGNATURE_EAX 0x31237648 |
| |
| /* |
| * The #defines related to the synthetic debugger are required by KDNet, but |
| * they are not documented in the Hyper-V TLFS because the synthetic debugger |
| * functionality has been deprecated and is subject to removal in future |
| * versions of Windows. |
| */ |
| #define HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS 0x40000080 |
| #define HYPERV_CPUID_SYNDBG_INTERFACE 0x40000081 |
| #define HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES 0x40000082 |
| |
| /* |
| * Hyper-V synthetic debugger platform capabilities |
| * These are HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX bits. |
| */ |
| #define HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING BIT(1) |
| |
| /* Hyper-V Synthetic debug options MSR */ |
| #define HV_X64_MSR_SYNDBG_CONTROL 0x400000F1 |
| #define HV_X64_MSR_SYNDBG_STATUS 0x400000F2 |
| #define HV_X64_MSR_SYNDBG_SEND_BUFFER 0x400000F3 |
| #define HV_X64_MSR_SYNDBG_RECV_BUFFER 0x400000F4 |
| #define HV_X64_MSR_SYNDBG_PENDING_BUFFER 0x400000F5 |
| #define HV_X64_MSR_SYNDBG_OPTIONS 0x400000FF |
| |
| /* Hyper-V HV_X64_MSR_SYNDBG_OPTIONS bits */ |
| #define HV_X64_SYNDBG_OPTION_USE_HCALLS BIT(2) |
| |
| static inline struct kvm_hv *to_kvm_hv(struct kvm *kvm) |
| { |
| return &kvm->arch.hyperv; |
| } |
| |
| static inline struct kvm_vcpu_hv *to_hv_vcpu(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.hyperv; |
| } |
| |
| static inline struct kvm_vcpu_hv_synic *to_hv_synic(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); |
| |
| return &hv_vcpu->synic; |
| } |
| |
| static inline struct kvm_vcpu *hv_synic_to_vcpu(struct kvm_vcpu_hv_synic *synic) |
| { |
| struct kvm_vcpu_hv *hv_vcpu = container_of(synic, struct kvm_vcpu_hv, synic); |
| |
| return hv_vcpu->vcpu; |
| } |
| |
| static inline struct kvm_hv_syndbg *to_hv_syndbg(struct kvm_vcpu *vcpu) |
| { |
| return &vcpu->kvm->arch.hyperv.hv_syndbg; |
| } |
| |
| static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); |
| |
| return hv_vcpu ? hv_vcpu->vp_index : vcpu->vcpu_idx; |
| } |
| |
| int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host); |
| int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host); |
| |
| static inline bool kvm_hv_hypercall_enabled(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.hyperv_enabled && to_kvm_hv(vcpu->kvm)->hv_guest_os_id; |
| } |
| |
| int kvm_hv_hypercall(struct kvm_vcpu *vcpu); |
| |
| void kvm_hv_irq_routing_update(struct kvm *kvm); |
| int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint); |
| void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector); |
| int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages); |
| |
| static inline bool kvm_hv_synic_has_vector(struct kvm_vcpu *vcpu, int vector) |
| { |
| return to_hv_vcpu(vcpu) && test_bit(vector, to_hv_synic(vcpu)->vec_bitmap); |
| } |
| |
| static inline bool kvm_hv_synic_auto_eoi_set(struct kvm_vcpu *vcpu, int vector) |
| { |
| return to_hv_vcpu(vcpu) && |
| test_bit(vector, to_hv_synic(vcpu)->auto_eoi_bitmap); |
| } |
| |
| void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu); |
| |
| bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu); |
| int kvm_hv_get_assist_page(struct kvm_vcpu *vcpu); |
| |
| static inline struct kvm_vcpu_hv_stimer *to_hv_stimer(struct kvm_vcpu *vcpu, |
| int timer_index) |
| { |
| return &to_hv_vcpu(vcpu)->stimer[timer_index]; |
| } |
| |
| static inline struct kvm_vcpu *hv_stimer_to_vcpu(struct kvm_vcpu_hv_stimer *stimer) |
| { |
| struct kvm_vcpu_hv *hv_vcpu; |
| |
| hv_vcpu = container_of(stimer - stimer->index, struct kvm_vcpu_hv, |
| stimer[0]); |
| return hv_vcpu->vcpu; |
| } |
| |
| static inline bool kvm_hv_has_stimer_pending(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); |
| |
| if (!hv_vcpu) |
| return false; |
| |
| return !bitmap_empty(hv_vcpu->stimer_pending_bitmap, |
| HV_SYNIC_STIMER_COUNT); |
| } |
| |
| /* |
| * With HV_ACCESS_TSC_INVARIANT feature, invariant TSC (CPUID.80000007H:EDX[8]) |
| * is only observed after HV_X64_MSR_TSC_INVARIANT_CONTROL was written to. |
| */ |
| static inline bool kvm_hv_invtsc_suppressed(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); |
| |
| /* |
| * If Hyper-V's invariant TSC control is not exposed to the guest, |
| * the invariant TSC CPUID flag is not suppressed, Windows guests were |
| * observed to be able to handle it correctly. Going forward, VMMs are |
| * encouraged to enable Hyper-V's invariant TSC control when invariant |
| * TSC CPUID flag is set to make KVM's behavior match genuine Hyper-V. |
| */ |
| if (!hv_vcpu || |
| !(hv_vcpu->cpuid_cache.features_eax & HV_ACCESS_TSC_INVARIANT)) |
| return false; |
| |
| /* |
| * If Hyper-V's invariant TSC control is exposed to the guest, KVM is |
| * responsible for suppressing the invariant TSC CPUID flag if the |
| * Hyper-V control is not enabled. |
| */ |
| return !(to_kvm_hv(vcpu->kvm)->hv_invtsc_control & HV_EXPOSE_INVARIANT_TSC); |
| } |
| |
| void kvm_hv_process_stimers(struct kvm_vcpu *vcpu); |
| |
| void kvm_hv_setup_tsc_page(struct kvm *kvm, |
| struct pvclock_vcpu_time_info *hv_clock); |
| void kvm_hv_request_tsc_page_update(struct kvm *kvm); |
| |
| void kvm_hv_xsaves_xsavec_maybe_warn(struct kvm_vcpu *vcpu); |
| |
| void kvm_hv_init_vm(struct kvm *kvm); |
| void kvm_hv_destroy_vm(struct kvm *kvm); |
| int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu); |
| void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu, bool hyperv_enabled); |
| int kvm_hv_set_enforce_cpuid(struct kvm_vcpu *vcpu, bool enforce); |
| int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args); |
| int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, |
| struct kvm_cpuid_entry2 __user *entries); |
| |
| static inline struct kvm_vcpu_hv_tlb_flush_fifo *kvm_hv_get_tlb_flush_fifo(struct kvm_vcpu *vcpu, |
| bool is_guest_mode) |
| { |
| struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); |
| int i = is_guest_mode ? HV_L2_TLB_FLUSH_FIFO : |
| HV_L1_TLB_FLUSH_FIFO; |
| |
| return &hv_vcpu->tlb_flush_fifo[i]; |
| } |
| |
| static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; |
| |
| if (!to_hv_vcpu(vcpu) || !kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu)) |
| return; |
| |
| tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu, is_guest_mode(vcpu)); |
| |
| kfifo_reset_out(&tlb_flush_fifo->entries); |
| } |
| |
| static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); |
| |
| return hv_vcpu && |
| (hv_vcpu->cpuid_cache.nested_eax & HV_X64_NESTED_DIRECT_FLUSH); |
| } |
| |
| static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); |
| u16 code; |
| |
| if (!hv_vcpu) |
| return false; |
| |
| code = is_64_bit_hypercall(vcpu) ? kvm_rcx_read(vcpu) : |
| kvm_rax_read(vcpu); |
| |
| return (code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE || |
| code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST || |
| code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX || |
| code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX); |
| } |
| |
| static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu) |
| { |
| if (!to_hv_vcpu(vcpu)) |
| return 0; |
| |
| if (!kvm_hv_assist_page_enabled(vcpu)) |
| return 0; |
| |
| return kvm_hv_get_assist_page(vcpu); |
| } |
| |
| static inline void kvm_hv_nested_transtion_tlb_flush(struct kvm_vcpu *vcpu, |
| bool tdp_enabled) |
| { |
| /* |
| * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or |
| * L2's VP_ID upon request from the guest. Make sure we check for |
| * pending entries in the right FIFO upon L1/L2 transition as these |
| * requests are put by other vCPUs asynchronously. |
| */ |
| if (to_hv_vcpu(vcpu) && tdp_enabled) |
| kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu); |
| } |
| |
| int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu); |
| #else /* CONFIG_KVM_HYPERV */ |
| static inline void kvm_hv_setup_tsc_page(struct kvm *kvm, |
| struct pvclock_vcpu_time_info *hv_clock) {} |
| static inline void kvm_hv_request_tsc_page_update(struct kvm *kvm) {} |
| static inline void kvm_hv_xsaves_xsavec_maybe_warn(struct kvm_vcpu *vcpu) {} |
| static inline void kvm_hv_init_vm(struct kvm *kvm) {} |
| static inline void kvm_hv_destroy_vm(struct kvm *kvm) {} |
| static inline int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu) |
| { |
| return 0; |
| } |
| static inline void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu) {} |
| static inline bool kvm_hv_hypercall_enabled(struct kvm_vcpu *vcpu) |
| { |
| return false; |
| } |
| static inline int kvm_hv_hypercall(struct kvm_vcpu *vcpu) |
| { |
| return HV_STATUS_ACCESS_DENIED; |
| } |
| static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) {} |
| static inline bool kvm_hv_synic_has_vector(struct kvm_vcpu *vcpu, int vector) |
| { |
| return false; |
| } |
| static inline bool kvm_hv_synic_auto_eoi_set(struct kvm_vcpu *vcpu, int vector) |
| { |
| return false; |
| } |
| static inline void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector) {} |
| static inline bool kvm_hv_invtsc_suppressed(struct kvm_vcpu *vcpu) |
| { |
| return false; |
| } |
| static inline void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu, bool hyperv_enabled) {} |
| static inline bool kvm_hv_has_stimer_pending(struct kvm_vcpu *vcpu) |
| { |
| return false; |
| } |
| static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) |
| { |
| return false; |
| } |
| static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu) |
| { |
| return false; |
| } |
| static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu) |
| { |
| return 0; |
| } |
| static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->vcpu_idx; |
| } |
| static inline void kvm_hv_nested_transtion_tlb_flush(struct kvm_vcpu *vcpu, bool tdp_enabled) {} |
| #endif /* CONFIG_KVM_HYPERV */ |
| |
| #endif /* __ARCH_X86_KVM_HYPERV_H__ */ |
