]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
x86/speculation/mds: Apply more accurate check on hypervisor platform
authorZhenzhong Duan <zhenzhong.duan@oracle.com>
Thu, 25 Jul 2019 02:39:09 +0000 (10:39 +0800)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 25 Jul 2019 10:51:55 +0000 (12:51 +0200)
commit517c3ba00916383af6411aec99442c307c23f684
treed6c9e59e8c566298d7d8c747cccbca18b5a7767c
parent643d83f0a3518d6fbcf88f970de0340a5aa6b5a2
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
arch/x86/kernel/cpu/bugs.c