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| author | Andrey Smetanin <asmetanin@virtuozzo.com> | 2015-11-10 15:36:34 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-11-25 17:24:22 +0100 |
| commit | 5c919412fe61c35947816fdbd5f7bd09fe0dd073 (patch) | |
| tree | e2435a515aac386a05869a20edc61dc5f9d2047d /arch/x86/kvm/hyperv.h | |
| parent | d62caabb41f33d96333f9ef15e09cd26e1c12760 (diff) | |
| download | linux-5c919412fe61c35947816fdbd5f7bd09fe0dd073.tar.gz linux-5c919412fe61c35947816fdbd5f7bd09fe0dd073.tar.bz2 linux-5c919412fe61c35947816fdbd5f7bd09fe0dd073.zip | |
kvm/x86: Hyper-V synthetic interrupt controller
SynIC (synthetic interrupt controller) is a lapic extension,
which is controlled via MSRs and maintains for each vCPU
- 16 synthetic interrupt "lines" (SINT's); each can be configured to
trigger a specific interrupt vector optionally with auto-EOI
semantics
- a message page in the guest memory with 16 256-byte per-SINT message
slots
- an event flag page in the guest memory with 16 2048-bit per-SINT
event flag areas
The host triggers a SINT whenever it delivers a new message to the
corresponding slot or flips an event flag bit in the corresponding area.
The guest informs the host that it can try delivering a message by
explicitly asserting EOI in lapic or writing to End-Of-Message (EOM)
MSR.
The userspace (qemu) triggers interrupts and receives EOM notifications
via irqfd with resampler; for that, a GSI is allocated for each
configured SINT, and irq_routing api is extended to support GSI-SINT
mapping.
Changes v4:
* added activation of SynIC by vcpu KVM_ENABLE_CAP
* added per SynIC active flag
* added deactivation of APICv upon SynIC activation
Changes v3:
* added KVM_CAP_HYPERV_SYNIC and KVM_IRQ_ROUTING_HV_SINT notes into
docs
Changes v2:
* do not use posted interrupts for Hyper-V SynIC AutoEOI vectors
* add Hyper-V SynIC vectors into EOI exit bitmap
* Hyper-V SyniIC SINT msr write logic simplified
Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Gleb Natapov <gleb@kernel.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
CC: qemu-devel@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/hyperv.h')
| -rw-r--r-- | arch/x86/kvm/hyperv.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index c7bce559f67b..315af4b660f4 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -29,4 +29,27 @@ int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata); bool kvm_hv_hypercall_enabled(struct kvm *kvm); int kvm_hv_hypercall(struct kvm_vcpu *vcpu); +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); + +static inline struct kvm_vcpu_hv_synic *vcpu_to_synic(struct kvm_vcpu *vcpu) +{ + return &vcpu->arch.hyperv.synic; +} + +static inline struct kvm_vcpu *synic_to_vcpu(struct kvm_vcpu_hv_synic *synic) +{ + struct kvm_vcpu_hv *hv; + struct kvm_vcpu_arch *arch; + + hv = container_of(synic, struct kvm_vcpu_hv, synic); + arch = container_of(hv, struct kvm_vcpu_arch, hyperv); + return container_of(arch, struct kvm_vcpu, arch); +} +void kvm_hv_irq_routing_update(struct kvm *kvm); + +void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu); + +int kvm_hv_activate_synic(struct kvm_vcpu *vcpu); + #endif |