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

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>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-04-02 11:04:05 +02:00
parent 7cbeed9bce
commit 898761158b
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu.c
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@ -4238,7 +4238,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
++vcpu->kvm->stat.mmu_pte_write; ++vcpu->kvm->stat.mmu_pte_write;
kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE); kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE);
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) { for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn) {
if (detect_write_misaligned(sp, gpa, bytes) || if (detect_write_misaligned(sp, gpa, bytes) ||
detect_write_flooding(sp)) { detect_write_flooding(sp)) {