Re: [Xen-devel] Question: can new qemu-xen co-work with old rombios?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2013-08-06 at 10:38 +0000, Liu, Jinsong wrote:
> Ian Campbell wrote:
> > On Tue, 2013-08-06 at 01:56 +0000, Liu, Jinsong wrote:
> >> Ian Campbell wrote:
> >>> On Mon, 2013-08-05 at 16:01 +0000, Liu, Jinsong wrote:
> >>> 
> >>>> can new qemu-xen co-work with old rombios?
> >>> 
> >>> No, this is not a supported combination.
> >>> 
> >>> qemu-trad == rombios
> >>> qemu-xen == seabios or ovmf.
> >>> 
> >>> No other combinations are valid. Hopefully libxl/xl gave an error
> >>> message when you tried? 
> >>> 
> >>> Ian.
> >> 
> >> Thanks Ian and Jacek!
> >> 
> >> Yes, libxl does give error messages:
> >> libxl: error: libxl_dm.c:1300:libxl__destroy_device_model: could not
> >> find device-model's pid for dom 1 libxl: error:
> >> libxl.c:1415:libxl__destroy_domid: libxl__destroy_device_model
> >> failed for 1  
> > 
> > Which version of Xen is this? Can you post the complete "xl -vvv
> > create" output please, it really ought to be bailing with a message
> > about the invalid combination of BIOS and qemu being attempted.
> > 
> > I suspect the messages above are just benign messages printed as part
> > of the attempt to tear down a partially built domain after the
> > original failure.
> > 
> > Ian.
> 
> My Xen git commit is 8f55cb0e360f977dc790adc393a6fd32b9933351.
> 
> xl -vvv create xl.hvm output are:
> Parsing config from xl.hvm
> libxl: debug: libxl_create.c:1230:do_domain_create: ao 0x11238a0: create: 
> how=(nil) callback=(nil) poller=0x1122f30
> libxl: error: libxl_dm.c:1300:libxl__destroy_device_model: could not find 
> device-model's pid for dom 8
> libxl: error: libxl.c:1415:libxl__destroy_domid: libxl__destroy_device_model 
> failed for 8
> libxl: debug: libxl_event.c:1569:libxl__ao_complete: ao 0x11238a0: complete, 
> rc=-3
> libxl: debug: libxl_create.c:1243:do_domain_create: ao 0x11238a0: inprogress: 
> poller=0x1122f30, flags=ic
> libxl: debug: libxl_event.c:1541:libxl__ao__destroy: ao 0x11238a0: destroy
> xc: debug: hypercall buffer: total allocations:20 total releases:20
> xc: debug: hypercall buffer: current allocations:0 maximum allocations:2
> xc: debug: hypercall buffer: cache current size:2
> xc: debug: hypercall buffer: cache hits:16 misses:2 toobig:2

Thanks.  It turns out libxl__domain_build_info_setdefault is returning
failure in this case, but not logging why. Something to fix I think.

> BTW, just for test&debug purpose, is there any easy way to work around
> to make new qemu-xen co-work with old rombios?

I'm afraid not, you would need to do actual development work to fix up
the various interactions.

Ian.


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