KVM: x86: fix x2apic logical address matching
We cannot hit the bug now, but future patches will expose this path.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 99c5365..555956c 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -599,7 +599,8 @@
logical_id = kvm_apic_get_reg(apic, APIC_LDR);
if (apic_x2apic_mode(apic))
- return (logical_id & mda) != 0;
+ return ((logical_id >> 16) == (mda >> 16))
+ && (logical_id & mda & 0xffff) != 0;
logical_id = GET_APIC_LOGICAL_ID(logical_id);