KVM: x86/xen: Support per-vCPU event channel upcall via local APIC

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Windows uses a per-vCPU vector, and it's delivered via the local APIC
basically like an MSI (with associated EOI) unlike the traditional
guest-wide vector which is just magically asserted by Xen (and in the
KVM case by kvm_xen_has_interrupt() / kvm_cpu_get_extint()).

Now that the kernel is able to raise event channel events for itself,
being able to do so for Windows guests is also going to be useful.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-15-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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David Woodhouse 2022-03-03 15:41:24 +00:00 • committed by Paolo Bonzini

parent 28d1629f75

commit fde0451be8

3 changed files with 43 additions and 0 deletions

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1

arch/x86/include/asm/kvm_host.h

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40

arch/x86/kvm/xen.c

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2

include/uapi/linux/kvm.h

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