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KVM: Retry fault before vmentry

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When page is swapped in it is mapped into guest memory only after guest
tries to access it again and generate another fault. To save this fault
we can map it immediately since we know that guest is going to access
the page. Do it only when tdp is enabled for now. Shadow paging case is
more complicated. CR[034] and EFER registers should be switched before
doing mapping and then switched back.

Acked-by: Rik van Riel <[email protected]>
Signed-off-by: Gleb Natapov <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
This commit is contained in:
Gleb Natapov 2010-10-17 18:13:42 +02:00 • committed by Avi Kivity
commit 56028d0861
5 changed files with 30 additions and 12 deletions
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2
virt/kvm/async_pf.c
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@ -132,6 +132,8 @@ void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu)
list_del(&work->link);
spin_unlock(&vcpu->async_pf.lock);
if (work->page)
kvm_arch_async_page_ready(vcpu, work);
kvm_arch_async_page_present(vcpu, work);
list_del(&work->queue);