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x86/srso: Improve i-cache locality for alias mitigation

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Commit aa730cff0c26244e88066b5b461a9f5fbac13823 upstream.

Move srso_alias_return_thunk() to the same section as
srso_alias_safe_ret() so they can share a cache line.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/eadaf5530b46a7ae8b936522da45ae555d2b3393.1693889988.git.jpoimboe@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Josh Poimboeuf 2023-09-04 22:04:55 -07:00 committed by Greg Kroah-Hartman
parent 065012bb77
commit 6b10edf916
1 changed files with 2 additions and 3 deletions

5
arch/x86/lib/retpoline.S

@ -177,15 +177,14 @@ SYM_START(srso_alias_safe_ret, SYM_L_GLOBAL, SYM_A_NONE)
int3
SYM_FUNC_END(srso_alias_safe_ret)
.section .text..__x86.return_thunk
SYM_CODE_START(srso_alias_return_thunk)
SYM_CODE_START_NOALIGN(srso_alias_return_thunk)
UNWIND_HINT_FUNC
ANNOTATE_NOENDBR
call srso_alias_safe_ret
ud2
SYM_CODE_END(srso_alias_return_thunk)
.section .text..__x86.return_thunk
/*
* Some generic notes on the untraining sequences:
*