Re: PVH boot with qemu

[Emile `iMil' Heitor <imil%home.imil.net@localhost>]

On Mon, 13 Nov 2023, Manuel Bouyer wrote:

> On Mon, Nov 13, 2023 at 06:37:01AM +0100, Emile `iMil' Heitor wrote:
> > The start_xen32 entrypoint is then found, and the kernel start, but falls in
> > an infinite loop in locore.S when mapping symbols and preloaded modules,
> > more precisely, in the fillkpt_nox macro. I assume %ecx is wrong or the region
> > corrupted for some reason. https://github.com/NetBSD/src/blob/trunk/sys/arch/amd64/amd64/locore.S#L738
>
> I don't think you can use start_xen32 as is, as it expects a Xen environnemwnt.
> You may need to write a new start routine, or make a difference between Xen
> vs non-Xen in the existing one.

It seems we have a similar problem to the second bullet point Colin Percival
noted here https://www.daemonology.net/blog/2022-10-18-FreeBSD-Firecracker.html
When removing the hvm_start_info address save portion, the sym mapping
doesn't fall into an infinite loop anymore.
Not yet sure how to fix that, I'll have a look at FreeBSD's commits on this
matter.

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Emile `iMil' Heitor <imil@{home.imil.net,NetBSD.org}> | https://imil.net