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| author |   Peter Zijlstra <peterz@infradead.org> | 2022-06-14 23:16:04 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2022-06-27 10:34:00 +0200 |
| commit | d7caac991feeef1b871ee6988fd2c9725df09039 (patch) | |
| tree | 3898bfd6d98b4721394662c2af34ab2c69fbc558 /arch/x86/entry/entry_64.S | |
| parent | objtool: Add entry UNRET validation (diff) | |
| download | linux-dev-d7caac991feeef1b871ee6988fd2c9725df09039.tar.xz linux-dev-d7caac991feeef1b871ee6988fd2c9725df09039.zip | |
x86/cpu/amd: Add Spectral Chicken
Zen2 uarchs have an undocumented, unnamed, MSR that contains a chicken
bit for some speculation behaviour. It needs setting.
Note: very belatedly AMD released naming; it's now officially called
MSR_AMD64_DE_CFG2 and MSR_AMD64_DE_CFG2_SUPPRESS_NOBR_PRED_BIT
but shall remain the SPECTRAL CHICKEN.
Suggested-by: Andrew Cooper <Andrew.Cooper3@citrix.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'arch/x86/entry/entry_64.S')
0 files changed, 0 insertions, 0 deletions