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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>
This commit is contained in:
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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2
include/uapi/linux/kvm.h
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@ -1754,6 +1754,7 @@ struct kvm_xen_vcpu_attr {
__u32 priority;
__u64 expires_ns;
} timer;
__u8 vector;
} u;
};
@ -1767,6 +1768,7 @@ struct kvm_xen_vcpu_attr {
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_EVTCHN_SEND */
#define KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID 0x6
#define KVM_XEN_VCPU_ATTR_TYPE_TIMER 0x7
#define KVM_XEN_VCPU_ATTR_TYPE_UPCALL_VECTOR 0x8
/* Secure Encrypted Virtualization command */
enum sev_cmd_id {