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SubjectRe: [tip:x86/pti] x86/retpoline: Fill return stack buffer on vmexit
On Fri, Jan 12, 2018 at 03:37:49AM -0800, tip-bot for David Woodhouse wrote:
> Commit-ID: 117cc7a908c83697b0b737d15ae1eb5943afe35b
> Gitweb: https://git.kernel.org/tip/117cc7a908c83697b0b737d15ae1eb5943afe35b
> Author: David Woodhouse <dwmw@amazon.co.uk>
> AuthorDate: Fri, 12 Jan 2018 11:11:27 +0000
> Committer: Thomas Gleixner <tglx@linutronix.de>
> CommitDate: Fri, 12 Jan 2018 12:33:37 +0100
>
> x86/retpoline: Fill return stack buffer on vmexit

...

> + /*
> + * A simpler FILL_RETURN_BUFFER macro. Don't make people use the CPP
> + * monstrosity above, manually.
> + */
> +.macro FILL_RETURN_BUFFER reg:req nr:req ftr:req
> +#ifdef CONFIG_RETPOLINE
> + ANNOTATE_NOSPEC_ALTERNATIVE
> + ALTERNATIVE "jmp .Lskip_rsb_\@", \
> + __stringify(__FILL_RETURN_BUFFER(\reg,\nr,%_ASM_SP)) \
> + \ftr
> +.Lskip_rsb_\@:
> +#endif
> +.endm

Looks unused to me. Was it ever gound to be used? If not:

---
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -121,20 +121,6 @@
#endif
.endm

- /*
- * A simpler FILL_RETURN_BUFFER macro. Don't make people use the CPP
- * monstrosity above, manually.
- */
-.macro FILL_RETURN_BUFFER reg:req nr:req ftr:req
-#ifdef CONFIG_RETPOLINE
- ANNOTATE_NOSPEC_ALTERNATIVE
- ALTERNATIVE "jmp .Lskip_rsb_\@", \
- __stringify(__FILL_RETURN_BUFFER(\reg,\nr,%_ASM_SP)) \
- \ftr
-.Lskip_rsb_\@:
-#endif
-.endm
-
#else /* __ASSEMBLY__ */

#define ANNOTATE_NOSPEC_ALTERNATIVE \
--
Regards/Gruss,
Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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