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Re: [PATCH v2] x86/boot: Setup correctly fs segment for bogus_real_magic
- To: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 11 Nov 2024 13:11:13 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 11 Nov 2024 12:11:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.11.2024 12:18, Frediano Ziglio wrote:
> --- a/xen/arch/x86/boot/wakeup.S
> +++ b/xen/arch/x86/boot/wakeup.S
> @@ -20,6 +20,8 @@ ENTRY(wakeup_start)
> movw %ax, %ds
> movw %ax, %ss # A stack required for BIOS call
> movw $wakesym(wakeup_stack), %sp
> + movw $0xb800, %ax
> + movw %ax, %fs
>
> pushl $0 # Kill dangerous flag early
> popfl
If put here, I think it needs to be accompanied by a comment, to avoid
it (wrongly) being deemed redundant again. Personally I would prefer if
it was put where it's needed, at bogus_real_magic itself (at which
point no commentary would be needed).
Jan
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