x86/speculation/mds: Apply more accurate check on hypervisor platform
X86_HYPER_NATIVE isn't accurate for checking if running on native platform,
e.g. CONFIG_HYPERVISOR_GUEST isn't set or "nopv" is enabled.
Checking the CPU feature bit X86_FEATURE_HYPERVISOR to determine if it's
running on native platform is more accurate.
This still doesn't cover the platforms on which X86_FEATURE_HYPERVISOR is
unsupported, e.g. VMware, but there is nothing which can be done about this
scenario.
Fixes: 8a4b06d391
("x86/speculation/mds: Add sysfs reporting for MDS")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1564022349-17338-1-git-send-email-zhenzhong.duan@oracle.com
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@ -1226,7 +1226,7 @@ static ssize_t l1tf_show_state(char *buf)
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static ssize_t mds_show_state(char *buf)
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static ssize_t mds_show_state(char *buf)
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{
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{
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if (!hypervisor_is_type(X86_HYPER_NATIVE)) {
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if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
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return sprintf(buf, "%s; SMT Host state unknown\n",
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return sprintf(buf, "%s; SMT Host state unknown\n",
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mds_strings[mds_mitigation]);
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mds_strings[mds_mitigation]);
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}
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}
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