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Re: [PATCH 08/22] x86/traps: Introduce ap_early_traps_init() and set up exception handling earlier
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 14 Aug 2025 10:53:26 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 14 Aug 2025 08:53:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.08.2025 13:13, Andrew Cooper wrote:
> On 12/08/2025 9:41 am, Jan Beulich wrote:
>> On 08.08.2025 22:23, Andrew Cooper wrote:
>>> --- a/xen/arch/x86/acpi/wakeup_prot.S
>>> +++ b/xen/arch/x86/acpi/wakeup_prot.S
>>> @@ -63,6 +63,9 @@ LABEL(s3_resume)
>>> pushq %rax
>>> lretq
>>> 1:
>>> + /* Set up early exceptions and CET before entering C properly. */
>>> + call ap_early_traps_init
>> But this is the BSP?
>
> By the end of the cleanup, what we have is:
>
> At boot only:
> * really early init, basic exception handling only
> * regular init (inc syscall trampolines)
> * late re-init as we change the stack linear address
>
> For everything else (APs, S3, hot-online):
> * early, full exception handling
> * regular init (inc syscall trampolines)
>
>
> Currently, these are named:
> * bsp_early_traps_init()
> * traps_init()
> * bsp_traps_reinit()
>
> and
> * ap_early_traps_init()
> * percpu_traps_init()
>
>
> Perhaps ap_early_traps_init() should be named
> percpu_early_traps_init()? But I'm open to suggestions.
That name looks like a better fit to me, yes.
Jan
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