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KVM: x86/xen: Kernel acceleration for XENVER_version
authorDavid Woodhouse <dwmw@amazon.co.uk>
Thu, 3 Mar 2022 15:41:23 +0000 (15:41 +0000)
committerPaolo Bonzini <pbonzini@redhat.com>
Wed, 9 Mar 2022 09:36:31 +0000 (04:36 -0500)
commit7447a131f74b99e6f6de0f6607fe50905db4a4ff
treec297b3d3ed9efeea64124fce356daaed05b17e84tree
parent66e7d7c6507c7b3161e8c2364102796d87b04079commit | diff
KVM: x86/xen: Kernel acceleration for XENVER_version

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>
arch/x86/include/asm/kvm_host.h diff | blob | history
arch/x86/kvm/xen.c diff | blob | history
include/uapi/linux/kvm.h diff | blob | history
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