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| author | Peter Zijlstra <peterz@infradead.org> | 2022-06-15 00:15:53 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-06-27 11:33:59 +0300 |
| commit | 2dbb887e875b1de3ca8f40ddf26bcfe55798c609 (patch) | |
| tree | 1f56e999ec2820a42d3020e89ebf0b489d34fdf8 /arch/x86/kernel/process.c | |
| parent | caa0ff24d5d0e02abce5e65c3d2b7f20a6617be5 (diff) | |
| download | linux-2dbb887e875b1de3ca8f40ddf26bcfe55798c609.tar.xz | |
x86/entry: Add kernel IBRS implementation
Implement Kernel IBRS - currently the only known option to mitigate RSB
underflow speculation issues on Skylake hardware.
Note: since IBRS_ENTER requires fuller context established than
UNTRAIN_RET, it must be placed after it. However, since UNTRAIN_RET
itself implies a RET, it must come after IBRS_ENTER. This means
IBRS_ENTER needs to also move UNTRAIN_RET.
Note 2: KERNEL_IBRS is sub-optimal for XenPV.
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/kernel/process.c')
0 files changed, 0 insertions, 0 deletions