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

Paolo Bonzini pbonzini at redhat.com
Tue Jan 28 12:25:42 UTC 2014

Il 28/01/2014 13:16, Laszlo Ersek ha scritto:
> On 01/28/14 12:54, Paolo Bonzini wrote:
>> Il 22/01/2014 13:40, Laszlo Ersek ha scritto:
>>> (b)
>>>   VenHw(C1E791A2-64CF-4B68-BDF1-1C31DABBDC84,0000131C00000000)/
>>>   HD(1,GPT,2F972E52-F7E0-4504-9FE7-F60E66352266,0x800,0x32000)/
>>>   \Image
>>> This is the file called "Image", in the root directory of the filesystem
>>> on the GPT hard disk partition identified by the HD() node, which can be
>>> reached behind the Vendor Hardware device that corresponds to the GUID
>>> and the rest of the binary garbage visible in the VenHw node.
>>> In detail this happens to be a virtio-mmio block device whose register
>>> range is mapped at 0x1C130000.
>> This would probably be something like
>> /virtio-mmio at 1c130000/disk at 0,0
>> As a stopgap solution, you could keep the UEFI shell in the boot order
>> if it is present in the UEFI boot order, even if the fw_cfg boot order
>> includes HALT.
> Indeed, this is precisely what I've called "recognizing and ignoring
> HALT", and "the least wrong solution", elsewhere in this discussion.

I'm not sure if this would be *ignoring* HALT.  For example the CD-ROMs 
would not be included in the list.

Given your note that "you can rely on the GUUID in the FvFile() node 
being well-known", HALT could look for entries including 
FvFile(7C04A583-9E3E-4F1C-AD65-E05268D0B4D1), copy them if present, and 
then conclude the boot order.  Or in an alternative interpretation, HALT 
could copy all the MemoryMapped entries, and then conclude the boot 
order.  You're more competent than me in choosing the best interpretation.

>>  Would relative HD() paths still work?
> Yes, they would. HALT will simply be considered "end of list".

... and earlier entries would be matched to the relative HD() path, 
because that relative path is "expanded" to the full path before your 
translation code runs.  Right?


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