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authorZhenzhong Duan <zhenzhong.duan@oracle.com>2019-07-25 10:39:09 +0800
committerThomas Gleixner <tglx@linutronix.de>2019-07-25 12:51:55 +0200
commit517c3ba00916383af6411aec99442c307c23f684 (patch)
treed6c9e59e8c566298d7d8c747cccbca18b5a7767c /arch
parent643d83f0a3518d6fbcf88f970de0340a5aa6b5a2 (diff)
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: 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
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/bugs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 66ca906aa790..801ecd1c3fd5 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1226,7 +1226,7 @@ static ssize_t l1tf_show_state(char *buf)
static ssize_t mds_show_state(char *buf)
{
- if (!hypervisor_is_type(X86_HYPER_NATIVE)) {
+ if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
return sprintf(buf, "%s; SMT Host state unknown\n",
mds_strings[mds_mitigation]);
}