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List:       qubes-devel
Subject:    Re: [qubes-devel] CoreBoot + Qubes on thinkpad x230
From:       Trammell Hudson <hudson () trmm ! net>
Date:       2016-08-12 13:21:27
Message-ID: 20160812132127.GO16348 () chishio ! swcp ! com
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On Tue, Jul 26, 2016 at 12:26:47PM -0600, Trammell Hudson wrote:
> [...]
> In better news, I have figured out why Xen won't start from
> kexec on a Linux CoreBoot payload.  Sometime between 3.1.0
> and 3.1.3 they added numerous dependencies on the BIOS and
> EBDA structures for initializing the VGA console as well as
> figuring out where to stash pre-boot data.
> 
> I forward ported the 3.1.0 xen/drivers/video/vga.c to 4.6.3
> and modified xen/arch/x86/boot/trampoline.S to not make any
> real mode calls, and modified xen/arch/x86/boot/head.S to 
> use the Multiboot lower memory pointer for the trampoline
> segment.

I've posted patches to the Xen mailing list, but don't have high hopes
that it will be accepted until someone hits the bug more than once
per decade:

https://lists.xenproject.org/archives/html/xen-devel/2016-08/msg01195.html

The vga changes might not be required, only the EBDA ones, since
Qubes doesn't use the Xen VGA console.  I haven't rebuilt that
part of the system recently to test it.

I've also submitted an additional patch to make the builds more
reproducible, which will hopefully show up soon:

https://lists.xenproject.org/archives/html/xen-devel/2016-08/msg01301.html

-- 
Trammell

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