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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 <riel@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov
2010-10-17 18:13:42 +02:00
committed by Avi Kivity
parent af585b921e
commit 56028d0861
5 changed files with 30 additions and 12 deletions
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14
arch/x86/kvm/x86.c
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@@ -6138,6 +6138,20 @@ void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
}
EXPORT_SYMBOL_GPL(kvm_set_rflags);
void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
{
int r;
if (!vcpu->arch.mmu.direct_map || is_error_page(work->page))
return;
r = kvm_mmu_reload(vcpu);
if (unlikely(r))
return;
vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
}
static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
{
return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));