From 3a31518a242dcb262b008d3bb5d4b1cf50cf4026 Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Wed, 19 Aug 2020 11:57:24 +1000
Subject: [PATCH] selftests/powerpc: Skip security tests on older CPUs
References: CVE-2020-4788 bsc#1177666
Patch-mainline: v5.10-rc1
Git-commit: 3a31518a242dcb262b008d3bb5d4b1cf50cf4026
Both these tests use PMU events that only work on newer CPUs, so skip
them on older CPUs.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200819015727.1977134-6-mpe@ellerman.id.au
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
tools/testing/selftests/powerpc/security/rfi_flush.c | 3 +++
tools/testing/selftests/powerpc/security/spectre_v2.c | 3 +++
2 files changed, 6 insertions(+)
diff --git a/tools/testing/selftests/powerpc/security/rfi_flush.c b/tools/testing/selftests/powerpc/security/rfi_flush.c
index fd37ff9b1c45..93a65bd1f231 100644
--- a/tools/testing/selftests/powerpc/security/rfi_flush.c
+++ b/tools/testing/selftests/powerpc/security/rfi_flush.c
@@ -89,6 +89,9 @@ int rfi_flush_test(void)
SKIP_IF(geteuid() != 0);
+ // The PMU event we use only works on Power7 or later
+ SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));
+
if (read_debugfs_file("powerpc/rfi_flush", &rfi_flush_org)) {
perror("Unable to read powerpc/rfi_flush debugfs file");
SKIP_IF(1);