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Re: [PATCH 09/22] x86/traps: Move load_system_tables() into traps-setup.c
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 14 Aug 2025 10:55:42 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 14 Aug 2025 08:55:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.08.2025 13:25, Andrew Cooper wrote:
> On 12/08/2025 10:19 am, Jan Beulich wrote:
>> On 08.08.2025 22:23, Andrew Cooper wrote:
>>> Since commit a35816b5cae8 ("x86/traps: Introduce early_traps_init() and
>>> simplify setup"), load_system_tables() is called later on the BSP, so the
>>> SYS_STATE_early_boot check can be dropped from the safety BUG_ON().
>>>
>>> Move the BUILD_BUG_ON() into build_assertions(),
>> I'm not quite convinced of this move - having the related BUILD_BUG_ON()
>> and BUG_ON() next to each other would seem better to me.
>
> I don't see a specific reason for them to be together, and the comment
> explains what's going on.
>
> With FRED, we want a related BUILD_BUG_ON(), but there's no equivalent
> BUG_ON() because MSR_RSP_SL0 will #GP on being misaligned.
That BUILD_BUG_ON() could then sit next to the MSR write? Unless of course
that ends up sitting in an assembly source.
Jan
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