KVM: nEPT: reset PDPTR register cache on nested vmentry emulation
authorGleb Natapov <gleb@redhat.com>
Mon, 2 Sep 2013 12:25:28 +0000 (15:25 +0300)
committerGleb Natapov <gleb@redhat.com>
Tue, 17 Sep 2013 09:52:42 +0000 (12:52 +0300)
After nested vmentry stale cache can be used to reload L2 PDPTR pointers
which will cause L2 guest to fail. Fix it by invalidating cache on nested
vmentry emulation.

https://bugzilla.kernel.org/show_bug.cgi?id=60830

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/vmx.c

index 1f1da43..4873593 100644 (file)
@@ -7766,6 +7766,10 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
                vmcs_write64(GUEST_PDPTR1, vmcs12->guest_pdptr1);
                vmcs_write64(GUEST_PDPTR2, vmcs12->guest_pdptr2);
                vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
+               __clear_bit(VCPU_EXREG_PDPTR,
+                               (unsigned long *)&vcpu->arch.regs_avail);
+               __clear_bit(VCPU_EXREG_PDPTR,
+                               (unsigned long *)&vcpu->arch.regs_dirty);
        }
 
        kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp);