Re: [Qemu-devel] [PATCH v2] Sort the fw_cfg file list

[Corey Minyard <cminyard@mvista.com>]

On 03/15/2016 12:01 PM, Michael S. Tsirkin wrote:
> On Tue, Mar 15, 2016 at 11:36:39AM -0500, Corey Minyard wrote:
>
>> I've hit a bit of a snag here.  For 0.11 and before, PCI option ROMs
>> were loaded via fw_cfg, not in the PCI ROM BAR.  This causes two
>> issues:
>>
>> * The order depends on the device initialization order,
>> which I'm not sure is quantifiable.  I believe it depends on
>> how they are listed on the command line.
>>
>> * Users can load their own romfile with their own name, which
>> means it can't be in the list.
>>
>> Also, for the ISA VGA ROMs, their order will also depend on the
>> device list order.
>>
>> Outside of that, I have an order of file names.
>>
>> I think if I treat the device ROMs separately and handle them
>> in init order, and then stick that device list in the proper location,
>> that will work.  Does that sound reasonable?
>>
>> Thanks,
>>
>> -corey
> I think so. By the time this becomes an issue we might decide to
> disable migration from 0.11
>

One more thing here.  I've realized that this is used for
non-x86, too, and I'm wondering how much those matter.
It's going to be really hard to figure out an order for these,
as different boards/arches use the same names and install
them in different orders.

For legacy mode, can I just put them in order for non-x86?
Is there an easy way to detect that you are running x86?

-corey