KVM: MMU: fix CR4.SMEP=1, CR0.WP=0 with shadow pages

commit 898761158be7682082955e3efa4ad24725305fc7 upstream.

smep_andnot_wp is initialized in kvm_init_shadow_mmu and shadow pages
should not be reused for different values of it.  Thus, it has to be
added to the mask in kvm_mmu_pte_write.

Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index bfc9507..4a949c7 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3609,7 +3609,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
                }
        }
 
-       mask.cr0_wp = mask.cr4_pae = mask.nxe = 1;
+       mask.cr0_wp = mask.cr4_pae = mask.nxe = mask.smep_andnot_wp = 1;
        for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn, node) {
                pte_size = sp->role.cr4_pae ? 8 : 4;
                misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1);