Re: [kvm-unit-tests PATCH v2 5/5] s390x: css: testing measurement block format 1

Cornelia Huck
2021-02-12T11:17:41Z

On Wed, 10 Feb 2021 14:20:14 +0100
Pierre Morel <pmorel@linux.ibm.com> wrote:

> Measurement block format 1 is made available by the extended
> mesurement block facility and is indicated in the SCHIB by

s/mesurement/measurement/

> the bit in the PMCW.
>
> The MBO is specified in the SCHIB of each channel and the MBO
> defined by the SCHM instruction is ignored.
>
> The test of the MB format 1 is just skipped if the feature is
> not available.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> lib/s390x/css.h | 14 ++++++++++++++
> s390x/css.c | 36 ++++++++++++++++++++++++++++++++++++
> 2 files changed, 50 insertions(+)

(...)

> +static void test_schm_fmt1(void)
> +{
> + struct measurement_block_format1 *mb1;
> +
> + report_prefix_push("Format 1");
> +
> + mb1 = alloc_io_mem(sizeof(struct measurement_block_format1), 0);
> + if (!mb1) {
> + report_abort("measurement_block_format1 allocation failed");
> + goto end;
> + }
> +
> + schm(NULL, 0); /* Clear previous MB address */

Same comment as for the last patch.

> + schm(0, SCHM_MBU);
> +
> + /* Expect error for non aligned MB */
> + report_prefix_push("Unaligned MB origin");
> + report_xfail(start_measure((u64)mb1 + 1, 0, true), mb1->ssch_rsch_count != 0,
> + "SSCH measured %d", mb1->ssch_rsch_count);
> + report_prefix_pop();
> +
> + memset(mb1, 0, sizeof(*mb1));
> +
> + /* Expect success */
> + report_prefix_push("Valid MB address and index");
> + report(start_measure((u64)mb1, 0, true) &&
> + mb1->ssch_rsch_count == SCHM_UPDATE_CNT,
> + "SSCH measured %d", mb1->ssch_rsch_count);
> + report_prefix_pop();
> +
> + free_io_mem(mb1, sizeof(struct measurement_block_format1));

Also here, you need to stop the measurements before freeing the block.

> +end:
> + report_prefix_pop();
> +}
> +
> static struct {
> const char *name;
> void (*func)(void);
> @@ -257,6 +292,7 @@ static struct {
> { "sense (ssch/tsch)", test_sense },
> { "measurement block (schm)", test_schm },
> { "measurement block format0", test_schm_fmt0 },
> + { "measurement block format1", test_schm_fmt1 },
> { NULL, NULL }
> };
>