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authorVitaly Kuznetsov <vkuznets@redhat.com>2020-05-25 16:41:20 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2020-06-01 04:26:07 -0400
commit2635b5c4a0e407b84f68e188c719f28ba0e9ae1b (patch)
tree7ce893331dea17b655113e3ed7640f7aa8462bf8 /virt
parent0958f0cefede403037653e44de0e3332d10b0e1a (diff)
KVM: x86: interrupt based APF 'page ready' event delivery
Concerns were expressed around APF delivery via synthetic #PF exception as in some cases such delivery may collide with real page fault. For 'page ready' notifications we can easily switch to using an interrupt instead. Introduce new MSR_KVM_ASYNC_PF_INT mechanism and deprecate the legacy one. One notable difference between the two mechanisms is that interrupt may not get handled immediately so whenever we would like to deliver next event (regardless of its type) we must be sure the guest had read and cleared previous event in the slot. While on it, get rid on 'type 1/type 2' names for APF events in the documentation as they are causing confusion. Use 'page not present' and 'page ready' everywhere instead. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20200525144125.143875-6-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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