Re: [PATCH v2 2/2] selftests/powerpc: Add test to verify rfi flush across a system call
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2018-05-24 13:20:34
"Naveen N. Rao" [off-list ref] writes:
quoted hunk ↗ jump to hunk
diff --git a/tools/testing/selftests/powerpc/security/rfi_flush.c b/tools/testing/selftests/powerpc/security/rfi_flush.c new file mode 100644 index 000000000000..a20fe8eca161 --- /dev/null +++ b/tools/testing/selftests/powerpc/security/rfi_flush.c@@ -0,0 +1,132 @@
...
+
+int rfi_flush_test(void)
+{
+ char *p;
+ int repetitions = 10;
+ int fd, passes = 0, iter, rc = 0;
+ struct perf_event_read v;
+ uint64_t l1d_misses_total = 0;
+ unsigned long iterations = 100000, zero_size = 24*1024;
+ int rfi_flush_org, rfi_flush;
+
+ SKIP_IF(geteuid() != 0);
+
+ if (read_debugfs_file("powerpc/rfi_flush", &rfi_flush_org)) {
+ perror("error reading powerpc/rfi_flush debugfs file");
+ printf("unable to determine current rfi_flush setting");
+ return 1;
+ }
This leads to a hard error on old kernels, which I don't want (breaks my CI).
So I changed it to:
if (read_debugfs_file("powerpc/rfi_flush", &rfi_flush_org)) {
perror("Unable to read powerpc/rfi_flush debugfs file");
SKIP_IF(1);
}
cheers