Re: [PATCH] selftests: kvm: Check whether SIDA memop fails for normal guests

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On 15/02/2022 16.25, Shuah Khan wrote:
On 2/15/22 12:48 AM, Thomas Huth wrote:
Commit 2c212e1baedc ("KVM: s390: Return error on SIDA memop on normal
guest") fixed the behavior of the SIDA memops for normal guests. It
would be nice to have a way to test whether the current kernel has
the fix applied or not. Thus add a check to the KVM selftests for
these two memops.

Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
---
  tools/testing/selftests/kvm/s390x/memop.c | 15 +++++++++++++++
  1 file changed, 15 insertions(+)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index 9f49ead380ab..d19c3ffdea3f 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -160,6 +160,21 @@ int main(int argc, char *argv[])
      run->psw_mask &= ~(3UL << (63 - 17));   /* Disable AR mode */
      vcpu_run(vm, VCPU_ID);                  /* Run to sync new state */
+    /* Check that the SIDA calls are rejected for non-protected guests */
+    ksmo.gaddr = 0;
+    ksmo.flags = 0;
+    ksmo.size = 8;
+    ksmo.op = KVM_S390_MEMOP_SIDA_READ;
+    ksmo.buf = (uintptr_t)mem1;
+    ksmo.sida_offset = 0x1c0;
+    rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
+    TEST_ASSERT(rv == -1 && errno == EINVAL,
+            "ioctl does not reject SIDA_READ in non-protected mode");

Printing what passed would be a good addition to understand the tests that
get run and expected to pass.

Yes, I agree ... I'll add that for a follow-up patch to my TODO list.

+    ksmo.op = KVM_S390_MEMOP_SIDA_WRITE;
+    rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
+    TEST_ASSERT(rv == -1 && errno == EINVAL,
+            "ioctl does not reject SIDA_WRITE in non-protected mode");
+

Same here.

      kvm_vm_free(vm);
      return 0;


Something to consider in a follow-on patch and future changes to these tests.

Reviewed-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>

 Thanks!

  Thomas





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