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/openbmc/linux/arch/x86/lib/
H A Dretpoline.Sf220125b Mon May 15 09:07:26 CDT 2023 Borislav Petkov (AMD) <bp@alien8.de> x86/retbleed: Add __x86_return_thunk alignment checks

Add a linker assertion and compute the 0xcc padding dynamically so that
__x86_return_thunk is always cacheline-aligned. Leave the SYM_START()
macro in as the untraining doesn't need ENDBR annotations anyway.

Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Link: https://lore.kernel.org/r/20230515140726.28689-1-bp@alien8.de
/openbmc/linux/arch/x86/kernel/
H A Dvmlinux.lds.Sf220125b Mon May 15 09:07:26 CDT 2023 Borislav Petkov (AMD) <bp@alien8.de> x86/retbleed: Add __x86_return_thunk alignment checks

Add a linker assertion and compute the 0xcc padding dynamically so that
__x86_return_thunk is always cacheline-aligned. Leave the SYM_START()
macro in as the untraining doesn't need ENDBR annotations anyway.

Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Link: https://lore.kernel.org/r/20230515140726.28689-1-bp@alien8.de