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| author | Peter Zijlstra <[email protected]> | 2022-06-14 23:15:54 +0200 |
|---|---|---|
| committer | Borislav Petkov <[email protected]> | 2022-06-27 10:33:59 +0200 |
| commit | c779bc1a9002fa474175b80e72b85c9bf628abb0 (patch) | |
| tree | e79fbab2ca5f15aad4a76200cd56c6ae899dfd67 /samples/bpf/map_perf_test_user.c | |
| parent | 2dbb887e875b1de3ca8f40ddf26bcfe55798c609 (diff) | |
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) <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Diffstat (limited to 'samples/bpf/map_perf_test_user.c')
0 files changed, 0 insertions, 0 deletions