[PATCH] KVM: MMU: Use the guest pdptrs instead of mapping cr3 in pae mode

This lets us not write protect a partial page, and is anyway what a real
processor does.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 4512d8c39c84..68e121eeccbc 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1491,6 +1491,8 @@ static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
 
         mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
         kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
+        if (!is_long_mode(vcpu) && is_pae(vcpu))
+                load_pdptrs(vcpu, vcpu->cr3);
 
         if (mmu_reset_needed)
                 kvm_mmu_reset_context(vcpu);