[kvm-unit-tests PATCH v4] s390x: Add strict mode to specification exception interpretation test

[Janis Schoetterl-Glausch <scgl@linux.ibm.com>]

While specification exception interpretation is not required to occur,
it can be useful for automatic regression testing to fail the test if it
does not occur.
Add a `--strict` argument to enable this.
`--strict` takes a list of machine types (as reported by STIDP)
for which to enable strict mode, for example
`--strict 3931,8562,8561,3907,3906,2965,2964`
will enable it for models z16 - z13.
Alternatively, strict mode can be enabled for all but the listed machine
types by prefixing the list with a `!`, for example
`--strict !1090,1091,2064,2066,2084,2086,2094,2096,2097,2098,2817,2818,2827,2828`
will enable it for z/Architecture models except those older than z13.
`--strict !` will enable it always.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
v3 -> v4
 * fix compiler warning due to format string (thanks Janosch)
     see range diff below
 * add R-b (thanks Thomas)

v2 -> v3
 * rebase on master
 * global strict bool
 * fix style issue

Range-diff against v3:
1:  76199f42 ! 1:  ef697f15 s390x: Add strict mode to specification exception interpretation test
    @@ Commit message
         `--strict !` will enable it always.
     
         Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
    +    Reviewed-by: Thomas Huth <thuth@redhat.com>
     
      ## s390x/spec_ex-sie.c ##
     @@
    @@ s390x/spec_ex-sie.c: static void test_spec_ex_sie(void)
     -		report_info("Interpreted initial exception, intercepted invalid program new PSW exception");
     +	msg = "Interpreted initial exception, intercepted invalid program new PSW exception";
     +	if (strict)
    -+		report(vm.sblk->gpsw.addr == 0xdeadbeee, msg);
    ++		report(vm.sblk->gpsw.addr == 0xdeadbeee, "%s", msg);
     +	else if (vm.sblk->gpsw.addr == 0xdeadbeee)
    -+		report_info(msg);
    ++		report_info("%s", msg);
      	else
      		report_info("Did not interpret initial exception");
      	report_prefix_pop();

 s390x/spec_ex-sie.c | 53 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 51 insertions(+), 2 deletions(-)

diff --git a/s390x/spec_ex-sie.c b/s390x/spec_ex-sie.c
index d8e25e75..5fa135b8 100644
--- a/s390x/spec_ex-sie.c
+++ b/s390x/spec_ex-sie.c
@@ -7,16 +7,19 @@
  * specification exception interpretation is off/on.
  */
 #include <libcflat.h>
+#include <stdlib.h>
 #include <sclp.h>
 #include <asm/page.h>
 #include <asm/arch_def.h>
 #include <alloc_page.h>
 #include <sie.h>
 #include <snippet.h>
+#include <hardware.h>
 
 static struct vm vm;
 extern const char SNIPPET_NAME_START(c, spec_ex)[];
 extern const char SNIPPET_NAME_END(c, spec_ex)[];
+static bool strict;
 
 static void setup_guest(void)
 {
@@ -37,6 +40,8 @@ static void reset_guest(void)
 
 static void test_spec_ex_sie(void)
 {
+	const char *msg;
+
 	setup_guest();
 
 	report_prefix_push("SIE spec ex interpretation");
@@ -60,16 +65,60 @@ static void test_spec_ex_sie(void)
 	report(vm.sblk->icptcode == ICPT_PROGI
 	       && vm.sblk->iprcc == PGM_INT_CODE_SPECIFICATION,
 	       "Received specification exception intercept");
-	if (vm.sblk->gpsw.addr == 0xdeadbeee)
-		report_info("Interpreted initial exception, intercepted invalid program new PSW exception");
+	msg = "Interpreted initial exception, intercepted invalid program new PSW exception";
+	if (strict)
+		report(vm.sblk->gpsw.addr == 0xdeadbeee, "%s", msg);
+	else if (vm.sblk->gpsw.addr == 0xdeadbeee)
+		report_info("%s", msg);
 	else
 		report_info("Did not interpret initial exception");
 	report_prefix_pop();
 	report_prefix_pop();
 }
 
+static bool parse_strict(int argc, char **argv)
+{
+	uint16_t machine_id;
+	char *list;
+	bool ret;
+
+	if (argc < 1)
+		return false;
+	if (strcmp("--strict", argv[0]))
+		return false;
+
+	machine_id = get_machine_id();
+	if (argc < 2) {
+		printf("No argument to --strict, ignoring\n");
+		return false;
+	}
+	list = argv[1];
+	if (list[0] == '!') {
+		ret = true;
+		list++;
+	} else {
+		ret = false;
+	}
+	while (true) {
+		long input = 0;
+
+		if (strlen(list) == 0)
+			return ret;
+		input = strtol(list, &list, 16);
+		if (*list == ',')
+			list++;
+		else if (*list != '\0')
+			break;
+		if (input == machine_id)
+			return !ret;
+	}
+	printf("Invalid --strict argument \"%s\", ignoring\n", list);
+	return ret;
+}
+
 int main(int argc, char **argv)
 {
+	strict = parse_strict(argc - 1, argv + 1);
 	if (!sclp_facilities.has_sief2) {
 		report_skip("SIEF2 facility unavailable");
 		goto out;

base-commit: ca85dda2671e88d34acfbca6de48a9ab32b1810d
-- 
2.36.1