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Re: [PATCH v7 0/2] x86/boot: Reduce assembly code
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 3 Oct 2024 08:46:01 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 03 Oct 2024 07:46:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03/10/2024 2:11 am, Marek Marczykowski-Górecki wrote:
> On Wed, Oct 02, 2024 at 04:27:19PM +0100, Frediano Ziglio wrote:
>> On Wed, Oct 2, 2024 at 3:04 PM Marek Marczykowski-Górecki
>> <marmarek@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>> On Tue, Oct 01, 2024 at 11:22:37AM +0100, Frediano Ziglio wrote:
>>>> This series came from part of the work of removing duplications between
>>>> boot code and rewriting part of code from assembly to C.
>>>> Rewrites EFI code in pure C.
>>> The MB2+EFI tests on Adler Lake fail with this series:
>>> https://gitlab.com/xen-project/people/marmarek/xen/-/pipelines/1478766782
>>> Looking at the VGA output (unfortunately not collected by the test
>>> itself) it hangs just after bootloader, before printing anything on the
>>> screen (or even clearing it after bootloader). The serial is silent too.
>>>
>> I tried multiple times to take a look at the logs, but I keep getting error
>> 500.
> 500? That's weird. Anyway, serial log is empty, so you haven't lost
> much.
> But also, I've ran it a couple more times and it is some regression.
> Staging reliably passes while staging+this series fails.
>
> Unfortunately I don't have any more info besides it hangs before
> printing anything on serial or VGA. Maybe it hanging only on Intel but
> not AMD is some hint? Or maybe it's some memory layout or firmware
> differences that matter here (bootloader is exactly the same)?
> FWIW some links:
> successful staging run on ADL:
> https://gitlab.com/xen-project/people/marmarek/xen/-/jobs/7980146338
> failed staging+this run on ADL:
> https://gitlab.com/xen-project/people/marmarek/xen/-/jobs/7980330394
> successful staging run on Zen3+:
> https://gitlab.com/xen-project/people/marmarek/xen/-/jobs/7980146359
> successful staging+this run on Zen3+:
> https://gitlab.com/xen-project/people/marmarek/xen/-/jobs/7980146359
Ok, we should do several things.
Frediano, can you split out the efi_multiboot2() prototype in asm/efi.h
and submit it separately from introducing efi_multiboot2_prelude().
Mechanically, it's a somewhat-large part of the patch, and won't be
related to whatever other failure is going on here.
Everyone, is it time to consider earlyprintk() ? This is not the first
time something like this has happened, and it wont be the last. I for
one am quite bored of doing ad-hoc debugging each time...
~Andrew
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