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author | Peter Zijlstra <peterz@infradead.org> | 2022-06-15 00:15:54 +0300 |
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committer | Borislav Petkov <bp@suse.de> | 2022-06-27 11:33:59 +0300 |
commit | c779bc1a9002fa474175b80e72b85c9bf628abb0 (patch) | |
tree | e79fbab2ca5f15aad4a76200cd56c6ae899dfd67 /Documentation | |
parent | 2dbb887e875b1de3ca8f40ddf26bcfe55798c609 (diff) | |
download | linux-c779bc1a9002fa474175b80e72b85c9bf628abb0.tar.xz |
x86/bugs: Optimize SPEC_CTRL MSR writes
When changing SPEC_CTRL for user control, the WRMSR can be delayed
until return-to-user when KERNEL_IBRS has been enabled.
This avoids an MSR write during context switch.
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 'Documentation')
0 files changed, 0 insertions, 0 deletions