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authorAvi Kivity <avi@qumranet.com>2008-05-29 15:56:28 +0400
committerAvi Kivity <avi@qumranet.com>2008-07-20 13:42:30 +0400
commit131d82791b628d4aeafd94ddc74a9b68f3d15a83 (patch)
treeedee39aaef0af651a6b5799fe71a81e180701320
parentd761a501cf9cd4fa08ff35d252ff08b8c31ce677 (diff)
downloadlinux-131d82791b628d4aeafd94ddc74a9b68f3d15a83.tar.xz
KVM: MMU: Avoid page prefetch on SVM
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>
-rw-r--r--arch/x86/kvm/mmu.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 62741b7c4223..5ebb2788bd73 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -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;
}