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| author | Krish Sadhukhan <krish.sadhukhan@oracle.com> | 2020-07-08 00:39:56 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-08 16:21:59 -0400 |
| commit | 761e4169346553c180bbd4a383aedd72f905bc9a (patch) | |
| tree | ced456fa86e62cae7839526c65627c22048597b5 /arch/x86/kvm/x86.c | |
| parent | 53efe527ca4a4432d17c693efde6eec56fb43ebb (diff) | |
| download | lwn-761e4169346553c180bbd4a383aedd72f905bc9a.tar.gz lwn-761e4169346553c180bbd4a383aedd72f905bc9a.zip | |
KVM: nSVM: Check that MBZ bits in CR3 and CR4 are not set on vmrun of nested guests
According to section "Canonicalization and Consistency Checks" in APM vol. 2
the following guest state is illegal:
"Any MBZ bit of CR3 is set."
"Any MBZ bit of CR4 is set."
Suggeted-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Message-Id: <1594168797-29444-3-git-send-email-krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 549b3f7228ac..475456a14d76 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -955,7 +955,7 @@ int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) } EXPORT_SYMBOL_GPL(kvm_set_xcr); -static int kvm_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) +int kvm_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) { if (cr4 & cr4_reserved_bits) return -EINVAL; @@ -965,6 +965,7 @@ static int kvm_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) return 0; } +EXPORT_SYMBOL_GPL(kvm_valid_cr4); int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) { |