Tell why guest exits from kvm to user space due to #AC, so user knows
what happened.
Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
target/i386/kvm.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 411402aa29fa..36bc1485d478 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -4464,8 +4464,15 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
ret = -1;
break;
case KVM_EXIT_EXCEPTION:
- fprintf(stderr, "KVM: exception %d exit (error code 0x%x)\n",
- run->ex.exception, run->ex.error_code);
+ if (run->ex.exception == AC_VECTOR) {
+ fprintf(stderr, "Guest encounters an #AC due to split lock. Because "
+ "guest doesn't expect this split lock #AC (it doesn't set "
+ "msr_test_ctrl.split_lock_detect) and host sets "
+ "split_lock_detect=fatal, guest has to be killed.\n");
+ } else {
+ fprintf(stderr, "KVM: exception %d exit (error code 0x%x)\n",
+ run->ex.exception, run->ex.error_code);
+ }
ret = -1;
break;
case KVM_EXIT_DEBUG:
--
2.20.1
