[libvirt] [PATCH v2 4/4] qemu-command: introduce new vgamem attribute for video devices

Pavel Hrdina phrdina at redhat.com
Tue Nov 18 08:37:29 UTC 2014

On 11/17/2014 08:48 AM, Gerd Hoffmann wrote:
>    Hi,
>> We cannot just start enforcing that the vram attribute should be power
>> of 2. We can ether silently modify the value from user to power of 2 or
>> let QEMU round the value up to nearest power of 2 value and just add
>> a note about this to documentation.
> How about simply ignoring vram in case it has a invalid value?  This way
> current behavior is maintained for existing xml files (not pass anything
> and let qemu use the defaults).
> Whenever libvirt applies fixups to the xml (like adding pci controllers
> to old xml configs, as done on "virsh edit" for example) libvirt can
> also fixup vram to have a valid value.
> cheers,
>    Gerd

Yes, fix the value to the next higher power of 2 is a solution. I've
checked the QEMU source code and it's done on your part since the vgamem
anyway so it's probable safe to do it also on our side for QEMU.


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