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Re: [PATCH] x86/stubs: Consolidate the stubs infrastructure in asm/stubs.h
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 16 May 2025 15:41:41 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 16 May 2025 13:41:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.05.2025 15:33, Andrew Cooper wrote:
> Very few files need the stubs. Move the infrastructure out of
> processor.h and config.h into a new stubs.h, and adjust the includes
> accordingly.
>
> Make the per-cpu struct stubs be read mostly; they're unmodified
> during the uptime of the CPU, and move them into smpboot.c seeing as
> that's where they're allocated and freed.
>
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
with one possible suggestion:
> --- /dev/null
> +++ b/xen/arch/x86/include/asm/stubs.h
> @@ -0,0 +1,37 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +#ifndef X86_ASM_STUBS_H
> +#define X86_ASM_STUBS_H
> +
> +/*
> + * Xen has several per-cpu executable stubs which are written dynamically.
This puts it pretty well. Yet in principle there may be further, perhaps
entirely different stubs in the future. Hence stubs.h feels a little
generic. What about exec-stubs.h?
Jan
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