From: Sachin Sant <sachinp@linux.vnet.ibm.com>
Date: Mon, 13 Dec 2021 16:42:23 +0000 (+0530)
Subject: selftests/powerpc: skip tests for unavailable mitigations.
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=18678591846d668649fbd4f87b4a4c470818d386;p=linux.git

selftests/powerpc: skip tests for unavailable mitigations.

Mitigation patching test iterates over a set of mitigations irrespective
of whether a certain mitigation is supported/available in the kernel.
This causes following messages on a kernel where some mitigations
are unavailable:

  Spawned threads enabling/disabling mitigations ...
  cat: entry_flush: No such file or directory
  cat: uaccess_flush: No such file or directory
  Waiting for timeout ...
  OK

This patch adds a check for available mitigations in the kernel.

Reported-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Signed-off-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Reviewed-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/163941374362.36967.18016981579099073379.sendpatchset@1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa
---

diff --git a/tools/testing/selftests/powerpc/security/mitigation-patching.sh b/tools/testing/selftests/powerpc/security/mitigation-patching.sh
index b0b20e0b4e30d..f43aa4b77fbaa 100755
--- a/tools/testing/selftests/powerpc/security/mitigation-patching.sh
+++ b/tools/testing/selftests/powerpc/security/mitigation-patching.sh
@@ -44,7 +44,10 @@ mitigations="barrier_nospec stf_barrier count_cache_flush rfi_flush entry_flush
 
 for m in $mitigations
 do
-    do_one "$m" &
+    if [[ -f /sys/kernel/debug/powerpc/$m ]]
+    then
+        do_one "$m" &
+    fi
 done
 
 echo "Spawned threads enabling/disabling mitigations ..."