Re: [PATCH 1/4] tests: acpi: manually pad OEM_ID/OEM_TABLE_ID for test_oem_fields() test

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 12 Jan 2022 08:44:19 -0500
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> On Wed, Jan 12, 2022 at 08:03:29AM -0500, Igor Mammedov wrote:
> > The next commit will revert OEM fields padding with whitespace to
> > padding with '\0' as it was before [1]. As result test_oem_fields() will
> > fail due to unexpectedly smaller ID sizes read from QEMU ACPI tables.
> > 
> > Pad OEM_ID/OEM_TABLE_ID manually with spaces so that values the test
> > puts on QEMU CLI and expected values match.
> > 
> > 1) 602b458201 ("acpi: Permit OEM ID and OEM table ID fields to be changed")
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>  
> 
> That's kind of ugly in that we do not test
> shorter names then.  How about we pad with \0 instead?


test_acpi_q35_slic() should cover short OEM_TABLE_ID.

also padding in this patch makes test_oem_fields() cleaner
and simplifies 3/4, switching to \0 here would require
merging this patch with the fix itself to avoid breaking
bisection.

If you still prefer to have test_oem_fields() test short
names, I can post following on top that can to it without
breaking bisection:

diff --git a/tests/qtest/bios-tables-test.c b/tests/qtest/bios-tables-test.c
index 90c9f6a0a2..0fd7cf1f89 100644
--- a/tests/qtest/bios-tables-test.c
+++ b/tests/qtest/bios-tables-test.c
@@ -71,8 +71,8 @@
 
 #define ACPI_REBUILD_EXPECTED_AML "TEST_ACPI_REBUILD_AML"
 
-#define OEM_ID             "TEST  "
-#define OEM_TABLE_ID       "OEM     "
+#define OEM_ID             "TEST"
+#define OEM_TABLE_ID       "OEM"
 #define OEM_TEST_ARGS      "-machine x-oem-id='" OEM_ID "',x-oem-table-id='" \
                            OEM_TABLE_ID "'"
 
@@ -1530,8 +1530,8 @@ static void test_oem_fields(test_data *data)
             continue;
         }
 
-        g_assert(memcmp(sdt->aml + 10, OEM_ID, 6) == 0);
-        g_assert(memcmp(sdt->aml + 16, OEM_TABLE_ID, 8) == 0);
+        g_assert(strncmp((char *)sdt->aml + 10, OEM_ID, 6) == 0);
+        g_assert(strncmp((char *)sdt->aml + 16, OEM_TABLE_ID, 8) == 0);
     }
 }
 


> And add a comment explaining why it's done.
> 
> > ---
> >  tests/qtest/bios-tables-test.c | 15 ++++++---------
> >  1 file changed, 6 insertions(+), 9 deletions(-)
> > 
> > diff --git a/tests/qtest/bios-tables-test.c b/tests/qtest/bios-tables-test.c
> > index e6b72d9026..90c9f6a0a2 100644
> > --- a/tests/qtest/bios-tables-test.c
> > +++ b/tests/qtest/bios-tables-test.c
> > @@ -71,9 +71,10 @@
> >  
> >  #define ACPI_REBUILD_EXPECTED_AML "TEST_ACPI_REBUILD_AML"
> >  
> > -#define OEM_ID             "TEST"
> > -#define OEM_TABLE_ID       "OEM"
> > -#define OEM_TEST_ARGS      "-machine x-oem-id="OEM_ID",x-oem-table-id="OEM_TABLE_ID
> > +#define OEM_ID             "TEST  "
> > +#define OEM_TABLE_ID       "OEM     "
> > +#define OEM_TEST_ARGS      "-machine x-oem-id='" OEM_ID "',x-oem-table-id='" \
> > +                           OEM_TABLE_ID "'"
> >  
> >  typedef struct {
> >      bool tcg_only;
> > @@ -1519,11 +1520,7 @@ static void test_acpi_q35_slic(void)
> >  static void test_oem_fields(test_data *data)
> >  {
> >      int i;
> > -    char oem_id[6];
> > -    char oem_table_id[8];
> >  
> > -    strpadcpy(oem_id, sizeof oem_id, OEM_ID, ' ');
> > -    strpadcpy(oem_table_id, sizeof oem_table_id, OEM_TABLE_ID, ' ');
> >      for (i = 0; i < data->tables->len; ++i) {
> >          AcpiSdtTable *sdt;
> >  
> > @@ -1533,8 +1530,8 @@ static void test_oem_fields(test_data *data)
> >              continue;
> >          }
> >  
> > -        g_assert(memcmp(sdt->aml + 10, oem_id, 6) == 0);
> > -        g_assert(memcmp(sdt->aml + 16, oem_table_id, 8) == 0);
> > +        g_assert(memcmp(sdt->aml + 10, OEM_ID, 6) == 0);
> > +        g_assert(memcmp(sdt->aml + 16, OEM_TABLE_ID, 8) == 0);
> >      }
> >  }
> >  
> > -- 
> > 2.31.1  
>