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Re: [libvirt] [PATCH 0/4] allow OVMF users to disable qemu's "-boot strict=on"



On 01/22/14 11:45, Daniel P. Berrange wrote:
> On Wed, Jan 22, 2014 at 01:33:18AM +0100, Laszlo Ersek wrote:
>> Recently,
>>
>>   commit 96fddee322c7d39a57cfdc5e7be71326d597d30a
>>   Author: Laine Stump <laine laine org>
>>   Date:   Mon Dec 2 14:07:12 2013 +0200
>>
>>       qemu: add "-boot strict" to commandline whenever possible
>>
>> introduced a regression for OVMF guests. The symptoms and causes are
>> described in patch 3/4, and in
>>
>>   https://bugzilla.redhat.com/show_bug.cgi?id=1056258
>>
>> Let's allow users to opt-out of "-boot strict=on" while preserving it as
>> default.
> 
> I don't really get from that bug description why this can't be
> made to work as desired in OVMF. It seems like its is just a
> bug in the OVMF impl that it doesn't work.

Have you read the description in patch 3 too?

The basic idea of HALT is that you specify everything in the fw_cfg file
that you want to boot from, and expect that the firmware attempt no
other option to boot. This assumes that you are able to *express* all
places that you want to boot from in the fw_cfg boot specification.

Under UEFI there are places to boot from that you simply cannot express
in fw_cfg. If you specify HALT, then you'll never reach those places,
not even as fallbacks. And users do want to reach those places as fallbacks.

Of course you can say "well then the user should not specify HALT".
Which is exactly the point of this patchset.

Laszlo


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