[PATCH v3 2/4] KVM: s390: selftests: Use TAP interface in the sync_regs test

Thomas Huth
2022-04-29T06:38:10Z

The sync_regs test currently does not have any output (unless one
of the TEST_ASSERT statement fails), so it's hard to say for a user
whether a certain new sub-test has been included in the binary or
not. Let's make this a little bit more user-friendly and include
some TAP output via the kselftests.h interface.
To be able to distinguish the different sub-tests more easily, we
also break up the huge main() function here in more fine grained
parts.

Acked-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
.../selftests/kvm/s390x/sync_regs_test.c | 87 ++++++++++++++-----
1 file changed, 66 insertions(+), 21 deletions(-)

diff --git a/tools/testing/selftests/kvm/s390x/sync_regs_test.c b/tools/testing/selftests/kvm/s390x/sync_regs_test.c
index caf7b8859a94..9510739e226d 100644
--- a/tools/testing/selftests/kvm/s390x/sync_regs_test.c
+++ b/tools/testing/selftests/kvm/s390x/sync_regs_test.c
@@ -21,6 +21,7 @@
#include "test_util.h"
#include "kvm_util.h"
#include "diag318_test_handler.h"
+#include "kselftest.h"

#define VCPU_ID 5

@@ -74,27 +75,9 @@ static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)
#define TEST_SYNC_FIELDS (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS|KVM_SYNC_DIAG318)
#define INVALID_SYNC_FIELD 0x80000000

-int main(int argc, char *argv[])
+void test_read_invalid(struct kvm_vm *vm, struct kvm_run *run)
{
- struct kvm_vm *vm;
- struct kvm_run *run;
- struct kvm_regs regs;
- struct kvm_sregs sregs;
- int rv, cap;
-
- /* Tell stdout not to buffer its content */
- setbuf(stdout, NULL);
-
- cap = kvm_check_cap(KVM_CAP_SYNC_REGS);
- if (!cap) {
- print_skip("CAP_SYNC_REGS not supported");
- exit(KSFT_SKIP);
- }
-
- /* Create VM */
- vm = vm_create_default(VCPU_ID, 0, guest_code);
-
- run = vcpu_state(vm, VCPU_ID);
+ int rv;

/* Request reading invalid register set from VCPU. */
run->kvm_valid_regs = INVALID_SYNC_FIELD;
@@ -110,6 +93,11 @@ int main(int argc, char *argv[])
"Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
rv);
vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;
+}
+
+void test_set_invalid(struct kvm_vm *vm, struct kvm_run *run)
+{
+ int rv;

/* Request setting invalid register set into VCPU. */
run->kvm_dirty_regs = INVALID_SYNC_FIELD;
@@ -125,6 +113,13 @@ int main(int argc, char *argv[])
"Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
rv);
vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;
+}
+
+void test_req_and_verify_all_valid_regs(struct kvm_vm *vm, struct kvm_run *run)
+{
+ struct kvm_sregs sregs;
+ struct kvm_regs regs;
+ int rv;

/* Request and verify all valid register sets. */
run->kvm_valid_regs = TEST_SYNC_FIELDS;
@@ -146,6 +141,13 @@ int main(int argc, char *argv[])

vcpu_sregs_get(vm, VCPU_ID, &sregs);
compare_sregs(&sregs, &run->s.regs);
+}
+
+void test_set_and_verify_various_reg_values(struct kvm_vm *vm, struct kvm_run *run)
+{
+ struct kvm_sregs sregs;
+ struct kvm_regs regs;
+ int rv;

/* Set and verify various register values */
run->s.regs.gprs[11] = 0xBAD1DEA;
@@ -180,6 +182,11 @@ int main(int argc, char *argv[])

vcpu_sregs_get(vm, VCPU_ID, &sregs);
compare_sregs(&sregs, &run->s.regs);
+}
+
+void test_clear_kvm_dirty_regs_bits(struct kvm_vm *vm, struct kvm_run *run)
+{
+ int rv;

/* Clear kvm_dirty_regs bits, verify new s.regs values are
* overwritten with existing guest values.
@@ -200,8 +207,46 @@ int main(int argc, char *argv[])
TEST_ASSERT(run->s.regs.diag318 != 0x4B1D,
"diag318 sync regs value incorrect 0x%llx.",
run->s.regs.diag318);
+}
+
+struct testdef {
+ const char *name;
+ void (*test)(struct kvm_vm *vm, struct kvm_run *run);
+} testlist[] = {
+ { "read invalid", test_read_invalid },
+ { "set invalid", test_set_invalid },
+ { "request+verify all valid regs", test_req_and_verify_all_valid_regs },
+ { "set+verify various regs", test_set_and_verify_various_reg_values },
+ { "clear kvm_dirty_regs bits", test_clear_kvm_dirty_regs_bits },
+};
+
+int main(int argc, char *argv[])
+{
+ static struct kvm_run *run;
+ static struct kvm_vm *vm;
+ int idx;
+
+ /* Tell stdout not to buffer its content */
+ setbuf(stdout, NULL);
+
+ ksft_print_header();
+
+ if (!kvm_check_cap(KVM_CAP_SYNC_REGS))
+ ksft_exit_skip("CAP_SYNC_REGS not supported");
+
+ ksft_set_plan(ARRAY_SIZE(testlist));
+
+ /* Create VM */
+ vm = vm_create_default(VCPU_ID, 0, guest_code);
+
+ run = vcpu_state(vm, VCPU_ID);
+
+ for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) {
+ testlist[idx].test(vm, run);
+ ksft_test_result_pass("%s\n", testlist[idx].name);
+ }

kvm_vm_free(vm);

- return 0;