Tell why guest exits from kvm to user space due to #AC, so user knows what happened.
Signed-off-by: Xiaoyao Li <xiaoyao...@intel.com> --- 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