Re: [kvm-unit-tests PATCH 2/8] s390x: diag308: Only test subcode 2 under QEMU

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On 05/04/2022 11.33, Janosch Frank wrote:
On 4/5/22 11:18, Thomas Huth wrote:
On 05/04/2022 09.52, Janosch Frank wrote:
Other hypervisors might implement it and therefore not send a
specification exception.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
---
   s390x/diag308.c | 15 ++++++++++++++-
   1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/s390x/diag308.c b/s390x/diag308.c
index c9d6c499..9614f9a9 100644
--- a/s390x/diag308.c
+++ b/s390x/diag308.c
@@ -8,6 +8,7 @@
   #include <libcflat.h>
   #include <asm/asm-offsets.h>
   #include <asm/interrupt.h>
+#include <hardware.h>
   /* The diagnose calls should be blocked in problem state */
   static void test_priv(void)
@@ -75,7 +76,7 @@ static void test_subcode6(void)
   /* Unsupported subcodes should generate a specification exception */
   static void test_unsupported_subcode(void)
   {
-    int subcodes[] = { 2, 0x101, 0xffff, 0x10001, -1 };
+    int subcodes[] = { 0x101, 0xffff, 0x10001, -1 };
       int idx;
       for (idx = 0; idx < ARRAY_SIZE(subcodes); idx++) {
@@ -85,6 +86,18 @@ static void test_unsupported_subcode(void)
           check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
           report_prefix_pop();
       }
+
+    /*
+     * Subcode 2 is not available under QEMU but might be on other
+     * hypervisors.
+     */
+    if (detect_host() != HOST_IS_TCG && detect_host() != HOST_IS_KVM) {

Shouldn't this be rather the other way round instead?

    if (detect_host() == HOST_IS_TCG || detect_host() == HOST_IS_KVM)

?

The css if checks if we are under QEMU, this one checks if we're not under QEMU.

but ...


+        expect_pgm_int();
+        asm volatile ("diag %0,%1,0x308" :: "d"(0), "d"(2));
+        check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);

... don't we want to check here whether the diag causes a spec exception if we are *under* QEMU here?
/me feels confused now.

 Thomas




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