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| author | Borislav Petkov (AMD) <bp@alien8.de> | 2023-05-12 14:05:11 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-05-12 17:53:18 +0200 |
| commit | d2408e043e7296017420aa5929b3bba4d5e61013 (patch) | |
| tree | 8f02c7889df096fd43ab30c8a2bb7ae031b3f521 /virt | |
| parent | b6c881b248ef9d629ec2365808cb4894991c0837 (diff) | |
| download | linux-stable-d2408e043e7296017420aa5929b3bba4d5e61013.tar.gz linux-stable-d2408e043e7296017420aa5929b3bba4d5e61013.tar.bz2 linux-stable-d2408e043e7296017420aa5929b3bba4d5e61013.zip | |
x86/alternative: Optimize returns patching
Instead of decoding each instruction in the return sites range only to
realize that that return site is a jump to the default return thunk
which is needed - X86_FEATURE_RETHUNK is enabled - lift that check
before the loop and get rid of that loop overhead.
Add comments about what gets patched, while at it.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230512120952.7924-1-bp@alien8.de
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions