Re: [PULL 31/53] hw/i386/pc: Default to use SMBIOS 3.0 for newer machine models

[Igor Mammedov]

On Tue, 28 Nov 2023 11:00:29 -0500
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> On Tue, Nov 28, 2023 at 03:53:21PM +0100, Fiona Ebner wrote:
> > Am 28.11.23 um 15:13 schrieb Daniel P. Berrangé:  
> > > On Tue, Nov 28, 2023 at 02:57:17PM +0100, Fiona Ebner wrote:  
> > >> we received some reports about the new default causing issues for
> > >> certain guest OSes [0][1]. Namely, for Juniper vSRX, where boot fails
> > >> and Microsoft Windows, where querying an UUID set via QEMU cmdline
> > >> -smbios 'type=1,uuid=a4656bd0-a07d-48e0-9dfd-bdc84667a8d0'
> > >> in Powershell with
> > >> get-wmiobject win32_computersystemproduct | Select-Object
> > >> -expandProperty UUID
> > >> doesn't return any value anymore and can trip up some guest
> > >> applications. The original report is about Windows 10 and I reproduced
> > >> this with Windows Server 2019 and the German (but I hope it doesn't
> > >> matter this time) version of Windows Server 2022.
> > >>
> > >> Using machine type 8.0 or the machine option smbios-entry-point-type=32
> > >> are workarounds.
> > >>
> > >> Since Windows is widely used, that seems a bit unfortunate. Just wanted
> > >> to ask if you are aware of the issue and if there is something else that
> > >> can be done other than specifying the more specific machine commandline
> > >> for those OSes?  
> > > 
> > > I don't recall seeing this issue mentioned before. Could you file a
> > > bug at https://gitlab.com/qemu-project/qemu
> > >   
> > 
> > I made one for the Windows issue:
> > https://gitlab.com/qemu-project/qemu/-/issues/2008
> > 
> > It's not clear to me if this is a bug in QEMU or just a bug/limitation
> > of the guest OS when 64 bit entry is used by SMBIOS.
> > 
> > I didn't create one for vSRX, because I'm not using it myself and since
> > it's based on FreeBSD and FreeBSD 13.1 can boot just fine with both 32
> > and 64 bit entry, it might be an issue on their side.
> > 
> > Best Regards,
> > Fiona  
> 
> I would be inclined to limit this to when we have too many VCPUs then.
> Igor WDYT?

Let me try to reproduce and see if Windows debug logs would provide some clue.