diff options
| author | Pawan Gupta <pawan.kumar.gupta@linux.intel.com> | 2025-05-05 14:35:12 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-18 08:24:58 +0200 |
| commit | 9d8295dcf2434bc8f5e5efad775b83d8f51a5dfa (patch) | |
| tree | af1e1899a5141e19f936bb8e88910ff8989d1122 /include/net/aligned_data.h | |
| parent | b86349f326259d1c4afab58a5e84bdd04b28e4fd (diff) | |
x86/bhi: Do not set BHI_DIS_S in 32-bit mode
commit 073fdbe02c69c43fb7c0d547ec265c7747d4a646 upstream.
With the possibility of intra-mode BHI via cBPF, complete mitigation for
BHI is to use IBHF (history fence) instruction with BHI_DIS_S set. Since
this new instruction is only available in 64-bit mode, setting BHI_DIS_S in
32-bit mode is only a partial mitigation.
Do not set BHI_DIS_S in 32-bit mode so as to avoid reporting misleading
mitigated status. With this change IBHF won't be used in 32-bit mode, also
remove the CONFIG_X86_64 check from emit_spectre_bhb_barrier().
Suggested-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net/aligned_data.h')
0 files changed, 0 insertions, 0 deletions