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x86/speculation/mds: Apply more accurate check on hypervisor platform

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commit 517c3ba00916383af6411aec99442c307c23f684 upstream.

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: 8a4b06d391b0 ("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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhenzhong Duan 2019-07-25 10:39:09 +08:00 • committed by Greg Kroah-Hartman
parent 50b8699c6b
commit cef888755a
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/cpu/bugs.c
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@ -1094,7 +1094,7 @@ static void __init l1tf_select_mitigation(void)
static ssize_t mds_show_state(char *buf)
{
#ifdef CONFIG_HYPERVISOR_GUEST
if (x86_hyper) {
if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
return sprintf(buf, "%s; SMT Host state unknown\n",
mds_strings[mds_mitigation]);
}