KVM: VMX: Fix host initiated access to guest MSR_TSC_AUX

The current handling of accesses to guest MSR_TSC_AUX returns error if
vcpu does not support rdtscp, though those accesses are initiated by
host. This can result in the reboot failure of some versions of
QEMU. This patch fixes this issue by passing those host initiated
accesses for further handling instead.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6b5605607849d42d15d096e0eb24c4db4814a241..44976a596fa65d2ca90421a7f7f06cfb2d0b17be 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2803,7 +2803,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                msr_info->data = vcpu->arch.ia32_xss;
                break;
        case MSR_TSC_AUX:
-               if (!guest_cpuid_has_rdtscp(vcpu))
+               if (!guest_cpuid_has_rdtscp(vcpu) && !msr_info->host_initiated)
                        return 1;
                /* Otherwise falls through */
        default:
@@ -2909,7 +2909,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                        clear_atomic_switch_msr(vmx, MSR_IA32_XSS);
                break;
        case MSR_TSC_AUX:
-               if (!guest_cpuid_has_rdtscp(vcpu))
+               if (!guest_cpuid_has_rdtscp(vcpu) && !msr_info->host_initiated)
                        return 1;
                /* Check reserved bit, higher 32 bits should be zero */
                if ((data >> 32) != 0)