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KVM: MMU: Avoid page prefetch on SVM

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SVM cannot benefit from page prefetching since guest page fault bypass
cannot by made to work there.  Avoid accessing the guest page table in
this case.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-05-29 14:56:28 +03:00
parent d761a501cf
commit 131d82791b
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kvm/mmu.c
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@ -850,7 +850,10 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
hlist_add_head(&sp->hash_link, bucket);
if (!metaphysical)
rmap_write_protect(vcpu->kvm, gfn);
vcpu->arch.mmu.prefetch_page(vcpu, sp);
if (shadow_trap_nonpresent_pte != shadow_notrap_nonpresent_pte)
vcpu->arch.mmu.prefetch_page(vcpu, sp);
else
nonpaging_prefetch_page(vcpu, sp);
return sp;
}