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KVM: async_pf: Inject 'page ready' event only if 'page not present' was previously injected

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'Page not present' event may or may not get injected depending on
guest's state. If the event wasn't injected, there is no need to
inject the corresponding 'page ready' event as the guest may get
confused. E.g. Linux thinks that the corresponding 'page not present'
event wasn't delivered *yet* and allocates a 'dummy entry' for it.
This entry is never freed.

Note, 'wakeup all' events have no corresponding 'page not present'
event and always get injected.

s390 seems to always be able to inject 'page not present', the
change is effectively a nop.

Suggested-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200610175532.779793-2-vkuznets@redhat.com>
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=208081
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov
2020-06-10 19:55:32 +02:00
committed by Paolo Bonzini
parent 7863e346e1
commit 2a18b7e7cd
6 changed files with 12 additions and 6 deletions
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1
include/linux/kvm_host.h
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@@ -206,6 +206,7 @@ struct kvm_async_pf {
unsigned long addr;
struct kvm_arch_async_pf arch;
bool wakeup_all;
bool notpresent_injected;
};
void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);