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Currently, Hyper-V context is part of 'struct kvm_vcpu_arch' and is always available. As a preparation to allocating it dynamically, check that it is not NULL at call sites which can normally proceed without it i.e. the behavior is identical to the situation when Hyper-V emulation is not being used by the guest. When Hyper-V context for a particular vCPU is not allocated, we may still need to get 'vp_index' from there. E.g. in a hypothetical situation when Hyper-V emulation was enabled on one CPU and wasn't on another, Hyper-V style send-IPI hypercall may still be used. Luckily, vp_index is always initialized to kvm_vcpu_get_idx() and can only be changed when Hyper-V context is present. Introduce kvm_hv_get_vpindex() helper for simplification. No functional change intended. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20210126134816.1880136-12-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
150 lines
4.5 KiB
C
150 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* KVM Microsoft Hyper-V emulation
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*
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* derived from arch/x86/kvm/x86.c
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*
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* Copyright (C) 2006 Qumranet, Inc.
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* Copyright (C) 2008 Qumranet, Inc.
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* Copyright IBM Corporation, 2008
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* Copyright 2010 Red Hat, Inc. and/or its affiliates.
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* Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
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*
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* Authors:
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* Avi Kivity <avi@qumranet.com>
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* Yaniv Kamay <yaniv@qumranet.com>
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* Amit Shah <amit.shah@qumranet.com>
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* Ben-Ami Yassour <benami@il.ibm.com>
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* Andrey Smetanin <asmetanin@virtuozzo.com>
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*/
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#ifndef __ARCH_X86_KVM_HYPERV_H__
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#define __ARCH_X86_KVM_HYPERV_H__
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#include <linux/kvm_host.h>
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/*
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* The #defines related to the synthetic debugger are required by KDNet, but
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* they are not documented in the Hyper-V TLFS because the synthetic debugger
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* functionality has been deprecated and is subject to removal in future
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* versions of Windows.
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*/
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#define HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS 0x40000080
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#define HYPERV_CPUID_SYNDBG_INTERFACE 0x40000081
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#define HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES 0x40000082
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/*
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* Hyper-V synthetic debugger platform capabilities
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* These are HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX bits.
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*/
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#define HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING BIT(1)
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/* Hyper-V Synthetic debug options MSR */
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#define HV_X64_MSR_SYNDBG_CONTROL 0x400000F1
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#define HV_X64_MSR_SYNDBG_STATUS 0x400000F2
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#define HV_X64_MSR_SYNDBG_SEND_BUFFER 0x400000F3
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#define HV_X64_MSR_SYNDBG_RECV_BUFFER 0x400000F4
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#define HV_X64_MSR_SYNDBG_PENDING_BUFFER 0x400000F5
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#define HV_X64_MSR_SYNDBG_OPTIONS 0x400000FF
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/* Hyper-V HV_X64_MSR_SYNDBG_OPTIONS bits */
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#define HV_X64_SYNDBG_OPTION_USE_HCALLS BIT(2)
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static inline struct kvm_hv *to_kvm_hv(struct kvm *kvm)
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{
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return &kvm->arch.hyperv;
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}
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static inline struct kvm_vcpu_hv *to_hv_vcpu(struct kvm_vcpu *vcpu)
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{
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return &vcpu->arch.hyperv;
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}
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static inline struct kvm_vcpu *hv_vcpu_to_vcpu(struct kvm_vcpu_hv *hv_vcpu)
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{
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struct kvm_vcpu_arch *arch;
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arch = container_of(hv_vcpu, struct kvm_vcpu_arch, hyperv);
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return container_of(arch, struct kvm_vcpu, arch);
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}
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static inline struct kvm_vcpu_hv_synic *to_hv_synic(struct kvm_vcpu *vcpu)
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{
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return &vcpu->arch.hyperv.synic;
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}
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static inline struct kvm_vcpu *hv_synic_to_vcpu(struct kvm_vcpu_hv_synic *synic)
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{
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return hv_vcpu_to_vcpu(container_of(synic, struct kvm_vcpu_hv, synic));
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}
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static inline struct kvm_hv_syndbg *to_hv_syndbg(struct kvm_vcpu *vcpu)
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{
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return &vcpu->kvm->arch.hyperv.hv_syndbg;
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}
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static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu)
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{
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struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
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return hv_vcpu ? hv_vcpu->vp_index : kvm_vcpu_get_idx(vcpu);
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}
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int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host);
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int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host);
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bool kvm_hv_hypercall_enabled(struct kvm *kvm);
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int kvm_hv_hypercall(struct kvm_vcpu *vcpu);
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void kvm_hv_irq_routing_update(struct kvm *kvm);
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int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint);
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void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector);
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int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages);
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void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu);
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void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu);
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void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu);
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bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu);
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bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu,
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struct hv_vp_assist_page *assist_page);
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static inline struct kvm_vcpu_hv_stimer *to_hv_stimer(struct kvm_vcpu *vcpu,
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int timer_index)
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{
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return &to_hv_vcpu(vcpu)->stimer[timer_index];
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}
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static inline struct kvm_vcpu *hv_stimer_to_vcpu(struct kvm_vcpu_hv_stimer *stimer)
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{
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struct kvm_vcpu_hv *hv_vcpu;
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hv_vcpu = container_of(stimer - stimer->index, struct kvm_vcpu_hv,
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stimer[0]);
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return hv_vcpu_to_vcpu(hv_vcpu);
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}
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static inline bool kvm_hv_has_stimer_pending(struct kvm_vcpu *vcpu)
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{
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struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
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if (!hv_vcpu)
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return false;
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return !bitmap_empty(hv_vcpu->stimer_pending_bitmap,
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HV_SYNIC_STIMER_COUNT);
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}
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void kvm_hv_process_stimers(struct kvm_vcpu *vcpu);
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void kvm_hv_setup_tsc_page(struct kvm *kvm,
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struct pvclock_vcpu_time_info *hv_clock);
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void kvm_hv_init_vm(struct kvm *kvm);
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void kvm_hv_destroy_vm(struct kvm *kvm);
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int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args);
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int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
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struct kvm_cpuid_entry2 __user *entries);
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#endif
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