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KVM: x86/xen: Kernel acceleration for XENVER_version

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Turns out this is a fast path for PV guests because they use it to
trigger the event channel upcall. So letting it bounce all the way up
to userspace is not great.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-14-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Woodhouse 2022-03-03 15:41:23 +00:00 • committed by Paolo Bonzini
parent 5363952605
commit 28d1629f75
3 changed files with 22 additions and 1 deletions
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3
include/uapi/linux/kvm.h
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@ -1711,7 +1711,7 @@ struct kvm_xen_hvm_attr {
__u32 padding[4];
} deliver;
} evtchn;
__u32 xen_version;
__u64 pad[8];
} u;
};
@ -1722,6 +1722,7 @@ struct kvm_xen_hvm_attr {
#define KVM_XEN_ATTR_TYPE_UPCALL_VECTOR 0x2
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_EVTCHN_SEND */
#define KVM_XEN_ATTR_TYPE_EVTCHN 0x3
#define KVM_XEN_ATTR_TYPE_XEN_VERSION 0x4
/* Per-vCPU Xen attributes */
#define KVM_XEN_VCPU_GET_ATTR _IOWR(KVMIO, 0xca, struct kvm_xen_vcpu_attr)