faeb7833ee
In Hyper-V, the fast guest->host notification mechanism is the SIGNAL_EVENT hypercall, with a single parameter of the connection ID to signal. Currently this hypercall incurs a user exit and requires the userspace to decode the parameters and trigger the notification of the potentially different I/O context. To avoid the costly user exit, process this hypercall and signal the corresponding eventfd in KVM, similar to ioeventfd. The association between the connection id and the eventfd is established via the newly introduced KVM_HYPERV_EVENTFD ioctl, and maintained in an (srcu-protected) IDR. Signed-off-by: Roman Kagan <rkagan@virtuozzo.com> Reviewed-by: David Hildenbrand <david@redhat.com> [asm/hyperv.h changes approved by KY Srinivasan. - Radim] Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
96 lines
2.8 KiB
C
96 lines
2.8 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_postcreate(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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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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#endif
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