From: Marc Orr <marcorr@xxxxxxxxxx> From: Venkatesh Srinivas <venkateshs@xxxxxxxxxxxx> The upper bytes of any x2APIC register are reserved. Inject a #GP into the guest if any of these reserved bits are set. Signed-off-by: Marc Orr <marcorr@xxxxxxxxxx> Signed-off-by: Venkatesh Srinivas <venkateshs@xxxxxxxxxxxx> --- arch/x86/kvm/lapic.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 6f8522e8c492..617e4936c5cc 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -2907,6 +2907,8 @@ int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data) if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic)) return 1; + else if (data >> 32) + return 1; return kvm_lapic_msr_write(apic, reg, data); } -- 2.36.1.124.g0e6072fb45-goog
