[libvirt] [PATCHv2] qemu: add ability to set PCI device "rombar" on or off

Laine Stump laine at laine.org
Tue Sep 27 16:36:42 UTC 2011

On 09/27/2011 02:53 AM, Daniel Veillard wrote:
> On Fri, Sep 23, 2011 at 10:35:19AM -0600, Eric Blake wrote:
>> On 09/22/2011 10:05 AM, Laine Stump wrote:
>>> (This addresses Eric's comments in his review of V1. BTW, I'm a bit
>>> surprised nobody has commented about the choice of name/placement of
>>> the new attribute - speak now or forever hold your peace :-))
>> I was okay with the xml naming - but I agree that if anyone else has
>> a better suggestion, now is the time to speak up :)
>>> This patch was made in response to:
>>>    https://bugzilla.redhat.com/show_bug.cgi?id=738095
>>> In short, qemu's default for the rombar setting (which makes the
>>> firmware ROM of a PCI device visible/not on the guest) was previously
>>> 0 (not visible), but they recently changed the default to 1
>>> (visible). Unfortunately, there are some PCI devices that fail in the
>>> guest when rombar is 1, so the setting must be exposed in libvirt to
>>> prevent a regression in behavior (it will still require explicitly
>>> setting<rom bar='off'/>   in the guest XML).
>>> rombar is forced on/off by adding:
>>>    <rom bar='on|off'/>
>>> inside a<hostdev>   element that defines a PCI device. It is currently
>>> ignored for all other types of devices.
>    Fine by me.
> The doc section explain that behaviour is unclear if not set (i.e.
> default to qemu's and that changed), so all fine IMHO

Okay, I made the last few changed Eric noted and pushed.


More information about the libvir-list mailing list