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s390: detect etoken facility

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Detect and report the etoken facility. With spectre_v2=auto or
CONFIG_EXPOLINE_AUTO=y automatically disable expolines and use
the full branch prediction mode for the kernel.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2018-05-08 15:14:48 +02:00
parent ccaabeea02
commit aeaf7002a7
2 changed files with 13 additions and 1 deletions
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2
arch/s390/kernel/nospec-sysfs.c
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@@ -13,6 +13,8 @@ ssize_t cpu_show_spectre_v1(struct device *dev,
ssize_t cpu_show_spectre_v2(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (test_facility(156))
return sprintf(buf, "Mitigation: etokens\n");
if (IS_ENABLED(CC_USING_EXPOLINE) && !nospec_disable)
return sprintf(buf, "Mitigation: execute trampolines\n");
if (__test_facility(82, S390_lowcore.alt_stfle_fac_list))