KVM: VMX: Remove redundant handling of bus lock vmexit

Hardware may or may not set exit_reason.bus_lock_detected on BUS_LOCK
VM-Exits. Dealing with KVM_RUN_X86_BUS_LOCK in handle_bus_lock_vmexit
could be redundant when exit_reason.basic is EXIT_REASON_BUS_LOCK.

We can remove redundant handling of bus lock vmexit. Unconditionally Set
exit_reason.bus_lock_detected in handle_bus_lock_vmexit(), and deal with
KVM_RUN_X86_BUS_LOCK only in vmx_handle_exit().

Signed-off-by: Hao Xiang <hao.xiang@linux.alibaba.com>
Message-Id: <1634299161-30101-1-git-send-email-hao.xiang@linux.alibaba.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 116b089..7fb2a3a 100644 (file)
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5562,9 +5562,13 @@ static int handle_encls(struct kvm_vcpu *vcpu)
 
 static int handle_bus_lock_vmexit(struct kvm_vcpu *vcpu)
 {
-       vcpu->run->exit_reason = KVM_EXIT_X86_BUS_LOCK;
-       vcpu->run->flags |= KVM_RUN_X86_BUS_LOCK;
-       return 0;
+       /*
+        * Hardware may or may not set the BUS_LOCK_DETECTED flag on BUS_LOCK
+        * VM-Exits. Unconditionally set the flag here and leave the handling to
+        * vmx_handle_exit().
+        */
+       to_vmx(vcpu)->exit_reason.bus_lock_detected = true;
+       return 1;
 }
 
 /*
@@ -6051,9 +6055,8 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
        int ret = __vmx_handle_exit(vcpu, exit_fastpath);
 
        /*
-        * Even when current exit reason is handled by KVM internally, we
-        * still need to exit to user space when bus lock detected to inform
-        * that there is a bus lock in guest.
+        * Exit to user space when bus lock detected to inform that there is
+        * a bus lock in guest.
         */
        if (to_vmx(vcpu)->exit_reason.bus_lock_detected) {
                if (ret > 0)