Re: [kvm-unit-tests PATCH 5/9] s390x: topology: Refine stsi header test

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On 10/11/23 13:19, Nina Schoetterl-Glausch wrote:
On Wed, 2023-10-11 at 13:16 +0200, Janosch Frank wrote:
On 10/11/23 10:56, Nina Schoetterl-Glausch wrote:
Add checks for length field.
Also minor refactor.

Signed-off-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx>
---
   s390x/topology.c | 15 +++++++++------
   1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/s390x/topology.c b/s390x/topology.c
index 5374582f..0ba57986 100644
--- a/s390x/topology.c
+++ b/s390x/topology.c
@@ -187,18 +187,22 @@ static void stsi_check_maxcpus(struct sysinfo_15_1_x *info)
   }
/*
- * stsi_check_mag
+ * stsi_check_header
    * @info: Pointer to the stsi information
+ * @sel2: stsi selector 2 value
    *
    * MAG field should match the architecture defined containers
    * when MNEST as returned by SCLP matches MNEST of the SYSIB.
    */
-static void stsi_check_mag(struct sysinfo_15_1_x *info)
+static void stsi_check_header(struct sysinfo_15_1_x *info, int sel2)
   {
   	int i;
- report_prefix_push("MAG");
+	report_prefix_push("Header");
+ report(IS_ALIGNED(info->length, 8), "Length %d multiple of 8", info->length);

STSI 15 works on Words, not DWords, no?
So we need to check length against 4, not 8.

The header is 16 bytes.
Topology list entries are 8 or 16, so it must be a multiple of 8 at least.

Fair enough



+	report(info->length < PAGE_SIZE, "Length %d in bounds", info->length);
+	report(sel2 == info->mnest, "Valid mnest");
   	stsi_check_maxcpus(info);
/*
@@ -326,7 +330,6 @@ static int stsi_get_sysib(struct sysinfo_15_1_x *info, int sel2)
if (max_nested_lvl >= sel2) {
   		report(!ret, "Valid instruction");
-		report(sel2 == info->mnest, "Valid mnest");
   	} else {
   		report(ret, "Invalid instruction");
   	}
@@ -365,7 +368,7 @@ static void check_sysinfo_15_1_x(struct sysinfo_15_1_x *info, int sel2)
   		goto vertical;
   	}
- stsi_check_mag(info);
+	stsi_check_header(info, sel2);
   	stsi_check_tle_coherency(info);
vertical:
@@ -378,7 +381,7 @@ vertical:
   		goto end;
   	}
- stsi_check_mag(info);
+	stsi_check_header(info, sel2);
   	stsi_check_tle_coherency(info);
   	report_prefix_pop();






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