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Re: [libvirt] [PATCH 0/2] smbios fixes



On Thu, Dec 02, 2010 at 10:36:59AM -0700, Eric Blake wrote:
> On 12/02/2010 05:47 AM, Daniel P. Berrange wrote:
> > On Wed, Dec 01, 2010 at 05:12:08PM -0700, Eric Blake wrote:
> >> In testing <smbios mode='host'/>, I noticed a couple of problems.
> >> First, qemu rejected the command line we gave it (invalid UUID);
> >> ifixingthat showed that all other arguments were being given literal
> >> "" which then made the guest smbios differ from the host.  Second,
> >> the qemu option -smbios type=1,family=string wasn't supported, which
> >> lead to a spurious difference between host and guest.
> >>
> >> Meanwhile, qemu has a bug where '-smbios type=1,uuid=uuid' must parse
> >> as a valid uuid, but is otherwise ignored.  The current qemu.git code
> >> base _only_ sets smbios uuid from the '-uuid uuid' argument.  I've
> >> filed a bug against the qemu folks asking whether this is intended (in
> >> which case we have to modify libvirt to change the -uuid argument it
> >> outputs when smbios is specified), or an oversight (hopefully the
> >> latter, since it's still nice to correlate
> >> /var/log/libvirt/qemu/....log with the XML uuid even when that differs
> >> from the smbios uuid presented to the guest.)
> > 
> > Hmm, I thought the UUID we were passing in was a host UUID, but
> > on closer inspection the type=1 table is definitely intended to
> > carry the guest UUID. As such it doesn't make sense to populate
> > that with anything other than the '<uuid>' from the guest XML.
> > A host UUID should live elsewhere in the SMBIOS tables, likely
> > in the type2 or type3 blocks
> 
> What does that mean to our XML?  Should we reject XML files where both
> domain/uuid and domain/sysinfo/system/entry/uuid exist, but differ?
> Both elements are optional, so it's feasible to see a guest uuid in
> either location.  Meanwhile, I'm waiting on resolution to
> https://bugzilla.redhat.com/show_bug.cgi?id=659122 to see if qemu will
> be patched to let us stick the host's uuid in block 2 (base board) or
> block 3 (chassis), in which case, we'll need to expand our XML to
> support that notion.
> 
As I commented on the BZ use OEM strings type 11 smbios table to pass
anything you want into a guest.

> I've also discovered that with current qemu, if both '-uuid uuid' and
> '-smbios type=1,uuid=uuid' are specified, then -uuid takes precedence;
> but either one of the two in isolation serves to set smbios block 1 with
> the guest's uuid.
> 
I am surprised that libvirt still uses -uuid.

--
			Gleb.


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