diff options
| 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 /tools/testing/selftests/bpf/prog_tests/recursion.c | |
| parent | 90d35da658da8cff0d4ecbb5113f5fac9d00eb72 (diff) | |
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 'tools/testing/selftests/bpf/prog_tests/recursion.c')
0 files changed, 0 insertions, 0 deletions