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There is a flaw in the Hyper-V SynIC implementation in KVM: when message page or event flags page is enabled by setting the corresponding msr, KVM zeroes it out. This is problematic because on migration the corresponding MSRs are loaded on the destination, so the content of those pages is lost. This went unnoticed so far because the only user of those pages was in-KVM hyperv synic timers, which could continue working despite that zeroing. Newer QEMU uses those pages for Hyper-V VMBus implementation, and zeroing them breaks the migration. Besides, in newer QEMU the content of those pages is fully managed by QEMU, so zeroing them is undesirable even when writing the MSRs from the guest side. To support this new scheme, introduce a new capability, KVM_CAP_HYPERV_SYNIC2, which, when enabled, makes sure that the synic pages aren't zeroed out in KVM. Signed-off-by: Roman Kagan <rkagan@virtuozzo.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/*
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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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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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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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static inline struct kvm_vcpu_hv *vcpu_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 *vcpu_to_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 *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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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);
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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_uninit(struct kvm_vcpu *vcpu);
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static inline struct kvm_vcpu_hv_stimer *vcpu_to_stimer(struct kvm_vcpu *vcpu,
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int timer_index)
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{
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return &vcpu_to_hv_vcpu(vcpu)->stimer[timer_index];
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}
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static inline struct kvm_vcpu *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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return !bitmap_empty(vcpu->arch.hyperv.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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#endif
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