KVM: nVMX: Fix nested bus lock VM exit

mainline inclusion
from mainline-v5.15-rc4
commit 24a996ad
category: feature
feature: KVM Bus Lock VM Exit
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5RJCB
CVE: N/A
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
commit/?id=24a996ad

Intel-SIG: commit 24a996ad ("KVM: nVMX: Fix nested bus lock VM exit")

-------------------------------------

KVM: nVMX: Fix nested bus lock VM exit

Nested bus lock VM exits are not supported yet. If L2 triggers bus lock
VM exit, it will be directed to L1 VMM, which would cause unexpected
behavior. Therefore, handle L2's bus lock VM exits in L0 directly.

Fixes: fe6b6bc8 ("KVM: VMX: Enable bus lock VM exit")
Signed-off-by: NChenyi Qiang <chenyi.qiang@intel.com>
Reviewed-by: NSean Christopherson <seanjc@google.com>
Reviewed-by: NXiaoyao Li <xiaoyao.li@intel.com>
Message-Id: <20210914095041.29764-1-chenyi.qiang@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAichun Shi <aichun.shi@intel.com>

arch/x86/kvm/vmx/nested.c

@@ -5857,6 +5857,12 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu,
 	case EXIT_REASON_VMFUNC:
 		/* VM functions are emulated through L2->L0 vmexits. */
 		return true;
+	case EXIT_REASON_BUS_LOCK:
+		/*
+		 * At present, bus lock VM exit is never exposed to L1.
+		 * Handle L2's bus locks in L0 directly.
+		 */
+		return true;
 	default:
 		break;
 	}