[kvm-unit-tests PATCH v2 7/8] x86: VMX: Make guest_state_test_main() check state from nested VM

[Oliver Upton <oupton@google.com>]

The current tests for guest state do not yet check the validity of
loaded state from within the nested VM. Introduce the
load_state_test_data struct to share data with the nested VM.

Signed-off-by: Oliver Upton <oupton@google.com>
---
 x86/vmx_tests.c | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index f035f24a771a..b72a27583793 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -5017,13 +5017,28 @@ static void test_entry_msr_load(void)
 	test_vmx_valid_controls(false);
 }
 
+static struct load_state_test_data {
+	u32 msr;
+	u64 exp;
+	bool enabled;
+} load_state_test_data;
+
 static void guest_state_test_main(void)
 {
+	u64 obs;
+	struct load_state_test_data *data = &load_state_test_data;
+
 	while (1) {
-		if (vmx_get_test_stage() != 2)
-			vmcall();
-		else
+		if (vmx_get_test_stage() == 2)
 			break;
+
+		if (data->enabled) {
+			obs = rdmsr(obs);
+			report("Guest state is 0x%lx (expected 0x%lx)",
+			       data->exp == obs, obs, data->exp);
+		}
+
+		vmcall();
 	}
 
 	asm volatile("fnop");
@@ -6854,7 +6869,9 @@ static void test_pat(u32 field, const char * field_name, u32 ctrl_field,
 	u64 i, val;
 	u32 j;
 	int error;
+	struct load_state_test_data *data = &load_state_test_data;
 
+	data->enabled = false;
 	vmcs_clear_bits(ctrl_field, ctrl_bit);
 	if (field == GUEST_PAT) {
 		vmx_set_test_stage(1);
-- 
2.23.0.187.g17f5b7556c-goog