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authorJim Mattson <jmattson@google.com>2020-08-17 21:16:55 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2020-08-17 22:23:50 +0300
commit427890aff8558eb4326e723835e0eae0e6fe3102 (patch)
tree23a8784def4552672ad18ee100fa373f2abbb5a0
parent19cf4b7eefc3040192bccb10c322e4c831bb0eb0 (diff)
downloadlinux-427890aff8558eb4326e723835e0eae0e6fe3102.tar.xz
kvm: x86: Toggling CR4.SMAP does not load PDPTEs in PAE mode
See the SDM, volume 3, section 4.4.1: If PAE paging would be in use following an execution of MOV to CR0 or MOV to CR4 (see Section 4.1.1) and the instruction is modifying any of CR0.CD, CR0.NW, CR0.PG, CR4.PAE, CR4.PGE, CR4.PSE, or CR4.SMEP; then the PDPTEs are loaded from the address in CR3. Fixes: 0be0226f07d14 ("KVM: MMU: fix SMAP virtualization") Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Jim Mattson <jmattson@google.com> Reviewed-by: Peter Shier <pshier@google.com> Reviewed-by: Oliver Upton <oupton@google.com> Message-Id: <20200817181655.3716509-2-jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--arch/x86/kvm/x86.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fcfd79a02e85..ecc3470b279e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -975,7 +975,7 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long old_cr4 = kvm_read_cr4(vcpu);
unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE |
- X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE;
+ X86_CR4_SMEP | X86_CR4_PKE;
if (kvm_valid_cr4(vcpu, cr4))
return 1;