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kvm/x86: Hyper-V kvm exit

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A new vcpu exit is introduced to notify the userspace of the
changes in Hyper-V SynIC configuration triggered by guest writing to the
corresponding MSRs.

Changes v4:
* exit into userspace only if guest writes into SynIC MSR's

Changes v3:
* added KVM_EXIT_HYPERV types and structs notes into docs

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>
This commit is contained in:
Andrey Smetanin
2015-11-10 15:36:35 +03:00
committed by Paolo Bonzini
parent 5c919412fe
commit db3975717a
6 changed files with 67 additions and 0 deletions
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6
arch/x86/kvm/x86.c
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@@ -6482,6 +6482,12 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
r = 0;
goto out;
}
if (kvm_check_request(KVM_REQ_HV_EXIT, vcpu)) {
vcpu->run->exit_reason = KVM_EXIT_HYPERV;
vcpu->run->hyperv = vcpu->arch.hyperv.exit;
r = 0;
goto out;
}
}
/*