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>

parent d761a501

arch/x86/kvm/mmu.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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);
		if (shadow_trap_nonpresent_pte != shadow_notrap_nonpresent_pte)
		vcpu->arch.mmu.prefetch_page(vcpu, sp);
		else
		nonpaging_prefetch_page(vcpu, sp);
		return sp;
		}