Add a "nop" after enabling single-stepping in vmx_l2_db_test() to ensure
a #DB is generated in the scope of the function even if the helper is
inlined. Enabling single-step #DBs have a one-instruction delay, e.g. if
the function were inlined and the caller generated a "terminal" VM-Exit
immediately after invoking the helper, then no #DB would be generated.
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
x86/vmx_tests.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index aa2ecbb..3e3d699 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -10745,6 +10745,7 @@ static void vmx_l2_bp_test(void)
static void vmx_l2_db_test(void)
{
write_rflags(read_rflags() | X86_EFLAGS_TF);
+ asm volatile("nop");
}
static uint64_t usermode_callback(void)
--
2.38.0.rc1.362.ged0d419d3c-goog
