On 21/01/2022 16.09, Nico Boehr wrote:
We already have some coverage for MSCH, but there are more cases to test
for:
- invalid SCHIB structure. We cover that by setting reserved bits 0, 1,
6 and 7 in the flags of the PMCW.
This test currently fails because of a QEMU bug, a fix
is available (see "[PATCH qemu] s390x/css: fix PMCW invalid mask")
- a pointer to an unaligned SCHIB. We cover misalignment by 1
and 2 bytes. Using pointer to valid memory avoids messing up
random memory in case of test failures.
Here's the QEMU PMCW invalid mask fix: https://lists.nongnu.org/archive/html/qemu-s390x/2021-12/msg00100.html
Signed-off-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
---
s390x/css.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/s390x/css.c b/s390x/css.c
index 881206ba1cef..afe1f71bb576 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -27,6 +27,8 @@ static int test_device_sid;
static struct senseid *senseid;
struct ccw1 *ccw;
+char alignment_test_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
Alternatively, you could also use alloc_page() in that new function... not
sure what's nicer, though.
static void test_enumerate(void)
{
test_device_sid = css_enumerate();
@@ -331,6 +333,54 @@ static void test_schm_fmt1(void)
free_io_mem(mb1, sizeof(struct measurement_block_format1));
}
+static void test_msch(void)
+{
+ const int align_to = 4;
+ int cc;
+ int invalid_pmcw_flags[] = {0, 1, 6, 7};
+ int invalid_flag;
+ uint16_t old_pmcw_flags;
+
+ if (!test_device_sid) {
+ report_skip("No device");
+ return;
+ }
+
+ cc = stsch(test_device_sid, &schib);
+ if (cc) {
+ report_fail("stsch: sch %08x failed with cc=%d", test_device_sid, cc);
+ return;
+ }
+
+ report_prefix_push("Unaligned");
+ for (int i = 1; i < align_to; i *= 2) {
+ report_prefix_pushf("%d", i);
+
+ expect_pgm_int();
+ msch(test_device_sid, (struct schib *)(alignment_test_page + i));
+ check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+
+ report_prefix_pop();
+ }
+ report_prefix_pop();
+
+ report_prefix_push("Invalid SCHIB");
+ old_pmcw_flags = schib.pmcw.flags;
+ for (int i = 0; i < ARRAY_SIZE(invalid_pmcw_flags); i++) {
+ invalid_flag = invalid_pmcw_flags[i];
+
+ report_prefix_pushf("PMCW flag bit %d set", invalid_flag);
+
+ schib.pmcw.flags = old_pmcw_flags | BIT(15 - invalid_flag);
+ expect_pgm_int();
+ msch(test_device_sid, &schib);
+ check_pgm_int_code(PGM_INT_CODE_OPERAND);
+
+ report_prefix_pop();
+ }
Maybe restore schib.pmcw.flags = old_pmcw_flags at the end, in case someone
wants to add more tests later?
+ report_prefix_pop();
+}
+
static struct {
const char *name;
void (*func)(void);
@@ -343,6 +393,7 @@ static struct {
{ "measurement block (schm)", test_schm },
{ "measurement block format0", test_schm_fmt0 },
{ "measurement block format1", test_schm_fmt1 },
+ { "msch", test_msch },
{ NULL, NULL }
};
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
