| From | Ben Hutchings <> | Date | Sun, 02 Aug 2015 01:02:37 +0100 | Subject | [PATCH 3.2 086/164] KVM: MMU: fix CR4.SMEP=1, CR0.WP=0 with shadow pages |
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3.2.70-rc1 review patch. If anyone has any objections, please let me know.
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From: Paolo Bonzini <pbonzini@redhat.com>
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> --- arch/x86/kvm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -3609,7 +3609,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu * } } - 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);
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