Commit 24a996ad authored Sep 14, 2021 by Chenyi Qiang Committed by Paolo Bonzini Sep 22, 2021

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: Chenyi Qiang <chenyi.qiang@intel.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-Id: <20210914095041.29764-1-chenyi.qiang@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 94c245a2

arch/x86/kvm/vmx/nested.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -5896,6 +5896,12 @@ 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;
		}