Re: [Xen-devel] can't create a vNUMA enabled PV guest

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Thu, 2015-07-02 at 16:25 -0400, Elena Ufimtseva wrote:
> On Wed, Jul 1, 2015 at 10:42 AM, Dario Faggioli

> > If I build a PV guest, it breaks:
> >
> > root@Zhaman:~# xl create -c /etc/xen/test.cfg
> > Parsing config from /etc/xen/test.cfg
> > xc: error: panic: xc_dom_x86.c:940: arch_setup_meminit: failed to allocate 
> > 0x20000 pages (v=1, p=1)
> > : Internal error
> > xc: error: panic: xc_dom_boot.c:155: xc_dom_boot_mem_init: can't allocate 
> > low memory for domain: Out of memory
> > libxl: error: libxl_dom.c:731:libxl__build_pv: xc_dom_boot_mem_init failed: 
> > Device or resource busy
> > libxl: error: libxl_create.c:1174:domcreate_rebuild_done: cannot (re-)build 
> > domain: -3
> > libxl: error: libxl.c:1586:libxl__destroy_domid: non-existant domain 15
> > libxl: error: libxl.c:1544:domain_destroy_callback: unable to destroy guest 
> > with domid 15
> > libxl: error: libxl.c:1471:domain_destroy_cb: destruction of domain 15 
> > failed
> >
> > (XEN) d0v1 Over-allocation for domain 15: 262656 > 262400
> > (XEN) memory.c:155:d0v1 Could not allocate order=9 extent: id=15 
> > memflags=210 (0 of 512)
> > (XEN) d0v1 Over-allocation for domain 15: 262401 > 262400
> > (XEN) memory.c:155:d0v1 Could not allocate order=0 extent: id=15 
> > memflags=210 (256 of 131072)
> >
> >
> > As said, I'll be looking into it in the next days. If, in the meanwhile,
> > someone has any ideas, that would be much appreciated. :-)
> 
> Hi Dario!
> 
Hi! :-)

> The kernel you are running maybe missing vNUMA patch.
>
Mmm... Interesting. I was indeed assuming that everything was upstream
already!

That being said, if it were a DomU kernel issue, I expected the kernel
itself to complain, rather than libxl and Xen. In fact, from the logs
above, I think this is all happening during domain creation, when the
kernel does not yet have a say in it.

As I said, I'll try to have a look, but I'm not sure if I'll be able to
by today...

> Konrad asked me if the patch was upstream. well, It is not, I think I
> abandoned it :).
> I will address latest comments and other changes in the v6 review and post it.
> 
Yeah, well, if we really are still missing it, the sooner we get it in,
the better! :-)

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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