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| author |  Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
| 2024-03-11 12:29:43 -0700 |
|---|---|---|
| committer |  Dave Hansen <dave.hansen@linux.intel.com>
| 2024-03-11 13:13:28 -0700 |
| commit | e95df4ec0c0c9791941f112db699fae794b9862a (patch) | |
| tree | 273916b25df45c01c17612b7715a432f40444604 /Documentation/admin-guide | |
| parent | Linux 6.8-rc7 (diff) | |
| download | linux-e95df4ec0c0c9791941f112db699fae794b9862a.tar.gz linux-e95df4ec0c0c9791941f112db699fae794b9862a.tar.bz2 linux-e95df4ec0c0c9791941f112db699fae794b9862a.zip | |
x86/mmio: Disable KVM mitigation when X86_FEATURE_CLEAR_CPU_BUF is set
Currently MMIO Stale Data mitigation for CPUs not affected by MDS/TAA is
to only deploy VERW at VMentry by enabling mmio_stale_data_clear static
branch. No mitigation is needed for kernel->user transitions. If such
CPUs are also affected by RFDS, its mitigation may set
X86_FEATURE_CLEAR_CPU_BUF to deploy VERW at kernel->user and VMentry.
This could result in duplicate VERW at VMentry.
Fix this by disabling mmio_stale_data_clear static branch when
X86_FEATURE_CLEAR_CPU_BUF is enabled.
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Diffstat (limited to 'Documentation/admin-guide')
0 files changed, 0 insertions, 0 deletions