From: Sean Christopherson sean.j.christopherson@intel.com
commit d74fcfc1f0ff4b6c26ecef1f9e48d8089ab4eaac upstream.
Inject a #GP on MOV CR4 if CR4.LA57 is toggled in 64-bit mode, which is illegal per Intel's SDM:
CR4.LA57 57-bit linear addresses (bit 12 of CR4) ... blah blah blah ... This bit cannot be modified in IA-32e mode.
Note, the pseudocode for MOV CR doesn't call out the fault condition, which is likely why the check was missed during initial development. This is arguably an SDM bug and will hopefully be fixed in future release of the SDM.
Fixes: fd8cb433734ee ("KVM: MMU: Expose the LA57 feature to VM.") Cc: stable@vger.kernel.org Reported-by: Sebastien Boeuf sebastien.boeuf@intel.com Signed-off-by: Sean Christopherson sean.j.christopherson@intel.com Message-Id: 20200703021714.5549-1-sean.j.christopherson@intel.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kvm/x86.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -865,6 +865,8 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, u if (is_long_mode(vcpu)) { if (!(cr4 & X86_CR4_PAE)) return 1; + if ((cr4 ^ old_cr4) & X86_CR4_LA57) + return 1; } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE) && ((cr4 ^ old_cr4) & pdptr_bits) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,