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Re: [PATCH 2/2] x86/trampoline: Rationalise the constants to describe the size
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 13 Nov 2024 13:00:35 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, "Daniel P . Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxx>, Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 13 Nov 2024 12:00:47 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.11.2024 12:52, Andrew Cooper wrote:
> On 13/11/2024 10:23 am, Jan Beulich wrote:
>> On 13.11.2024 10:30, Andrew Cooper wrote:
>>> --- a/xen/arch/x86/include/asm/config.h
>>> +++ b/xen/arch/x86/include/asm/config.h
>>> @@ -51,8 +51,9 @@
>>>
>>> #define IST_SHSTK_SIZE 1024
>>>
>>> -#define TRAMPOLINE_STACK_SPACE PAGE_SIZE
>>> -#define TRAMPOLINE_SPACE (KB(64) - TRAMPOLINE_STACK_SPACE)
>>> +/* See asm/trampoline.h */
>>> +#define TRAMPOLINE_SIZE KB(64)
>>> +#define TRAMPOLINE_HEAP_END (TRAMPOLINE_SIZE - PAGE_SIZE)
>> Is there actually a reason these can't move to trampoline.h?
>
> I considered that, and ruled it out, but I can't remember why exactly.
>
> Right now, trampoline.h is C-only, but it can gain some __ASSEMBLY__
> easily enough.
>
>
> The two later constants, WAKEUP_STACK_MIN and MBI_SPACE_MIN are used
> only in linker assertions, and of dubious value. In particular, the
> size of the VESA information in the heap is not accounted for in the
> MBI_SPACE_MIN check.
>
> I have an idea to remove all of this boot metadata shuffling when the
> boot_info work is a bit better done, which is why I left the constants
> alone.
Fair enough then.
Jan
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