[libvirt] [Qemu-devel] Configuring pflash devices for OVMF firmware

[Paolo Bonzini]

On 31/01/19 10:41, Markus Armbruster wrote:
> Paolo Bonzini <pbonzini at redhat.com> writes:
> 
>> On 31/01/19 09:40, Markus Armbruster wrote:
>>>> Maybe we should just add pflash block properties to the machine?  And
>>>> then it can create the devices if the properties are set to a non-empty
>>>> value.
>>> What exactly do you have in mind?  Something like
>>>
>>>     -machine q35,ovmf-code=OVMF-CODE-NODE,ovmf-data=OVMF-DATA-NODE
>>>
>>> where OVMF-CODE-NODE and OVMF-DATA-NODE are block backend node names,
>>> i.e.
>>>
>>>     -blockdev file,node-name=OVMF-CODE-NODE,read-only=on,filename=/usr/share/edk2/ovmf/OVMF_CODE.fd
>>>     -blockdev file,node-name=OVMF-DATA-NODE,read-only=on,filename=...
>>
>> Yes, though I would call it pflash0 and pflash1.
> 
> Digression... should we put traditional BIOS in flash as well?  Only for
> new machine types, obviously.

The blocker was that very old KVM didn't support ROMD memory regions.
Now on one hand we don't support those old kernel versions anymore; on
the other hand we have HAX and WHPX that do not support ROMD at all.

Paolo