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authorJan Kiszka <jan.kiszka@siemens.com>2014-01-24 16:48:44 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2014-01-27 14:39:44 +0100
commit58cb628dbe24ce21b884729aebe15acb903dbfb5 (patch)
tree56355ea28e8f76fc0f933ae39d481ecb00a90a0b /arch/x86/kvm/cpuid.h
parentb3af1e889ec4909f6b48dabd19a311d9c9f8d58e (diff)
downloadlinux-58cb628dbe24ce21b884729aebe15acb903dbfb5.tar.bz2
KVM: x86: Validate guest writes to MSR_IA32_APICBASE
Check for invalid state transitions on guest-initiated updates of MSR_IA32_APICBASE. This address both enabling of the x2APIC when it is not supported and all invalid transitions as described in SDM section 10.12.5. It also checks that no reserved bit is set in APICBASE by the guest. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> [Use cpuid_maxphyaddr instead of guest_cpuid_get_phys_bits. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.h')
-rw-r--r--arch/x86/kvm/cpuid.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index f1e4895174b2..a2a1bb7ed8c1 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -72,4 +72,12 @@ static inline bool guest_cpuid_has_pcid(struct kvm_vcpu *vcpu)
return best && (best->ecx & bit(X86_FEATURE_PCID));
}
+static inline bool guest_cpuid_has_x2apic(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *best;
+
+ best = kvm_find_cpuid_entry(vcpu, 1, 0);
+ return best && (best->ecx & bit(X86_FEATURE_X2APIC));
+}
+
#endif