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diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
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+/* 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"
+
+/* "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);
+
+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_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);
+}
+
+int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);
+
+#endif