kvm: SMM: fix losing SMI problem

virt inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NP0K
CVE: NA
-------------------

fix losing SMI problem
Signed-off-by: Nxulei <stone.xulei@huawei.com>
Signed-off-by: NJingyi Wang <wangjingyi11@huawei.com>
Reviewed-by: NZenghui Yu <yuzenghui@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/x86/kvm/x86.c

@@ -4227,6 +4227,11 @@ static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
 
 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu)
 {
+	if (is_smm(vcpu)) {
+		vcpu->arch.hflags &= ~HF_SMM_MASK;
+		vcpu->arch.smi_pending = 0;
+	}
+
 	kvm_make_request(KVM_REQ_SMI, vcpu);
 
 	return 0;