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Re: [Qemu-devel] [PATCH 1.3?] multiboot: fix e801 memory map
From: |
Anthony Liguori |
Subject: |
Re: [Qemu-devel] [PATCH 1.3?] multiboot: fix e801 memory map |
Date: |
Thu, 29 Nov 2012 15:12:53 -0600 |
User-agent: |
Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
Paolo Bonzini <address@hidden> writes:
> Il 29/11/2012 20:24, Alexander Graf ha scritto:
>>> > It is in hw/multiboot.c:
>>> >
>>> > stl_p(bootinfo + MBI_MEM_LOWER, 640);
>> You want to remove that one then.
>
> I wasn't sure of what happens if the multiboot option ROM is old. Do we
> support that to any extent?
Option ROMs are migrated but reset after reboot. I guess you could
migrate before the option ROM is executed but that seems extraordinarily
unlikely.
Regards,
Anthony Liguori
>
>> > Regarding the testcase, Xen will touch the EBDA without this patch and
>> > with http://permalink.gmane.org/gmane.comp.emulators.xen.devel/144855.
>> > However, SeaBIOS does not complain.
>>
>> I see :). Well, the patch is unintrusive enough for be ok for 1.3 IMHO.
>
> Actually it's relatively easy to see a failure with Xen and a need to
> PCI passthrough something with a bulky boot ROM; iSCSI or FC cards will
> do. You'll need both the Xen patch above, and this patch to boot
> successfully. Otherwise, it will fail to boot.
>
> Paolo
Re: [Qemu-devel] [PATCH 1.3?] multiboot: fix e801 memory map, Anthony Liguori, 2012/11/30