Re: [Xen-devel] [V8 PATCH 0/8] pvh dom0....

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Mon, 24 Mar 2014 08:57:12 +0000
"Jan Beulich" <JBeulich@xxxxxxxx> wrote:

> >>> On 22.03.14 at 02:39, <mukesh.rathor@xxxxxxxxxx> wrote:
....... 
> > Caveat:
> > 
> > With these patches, an HVM guest during boot intermittantly takes
> > unresolved fault in load_module() path. This for PVH dom0 and not <===
> > PV, and latest upstream kernel. I was not able to reproduce
> > with older stock fedora 19 kernel. So, it appears the problem might
> > be on the guest side, and not xen. Hence I decided to go ahead and
> > submit these while I debug that.
> 
> Without proper understanding of this I don't see a way for us to apply
> the series, and it should therefore have been tagged as RFC. Just to
> avoid any misunderstanding - even if the root cause was on the guest
> side, if without your patches the issue never surfaces, this would
> still need to be treated as a regression, and a way would need to be

Well, the problem doesn't happen with PV dom0, only PVH dom0, so not 
quite a regression IMO :).

> found to make those guests work flawlessly again. Furthermore, with
> the issue being in HVM guests, it is rather unlikely (but admittedly
> not entirely impossible) that the issue is in the guest, as similar
> problems aren't - aiui- known from Linux running on native hardware.
> 
> Apart from that, assuming you spent quite some time in isolating the
> problem - did you determine which of the patches in this series
> introduces it? Knowing that might help in determining possible reasons

No, since the problem only occurs on PVH dom0 and not PV dom0, I need 
all patches to boot dom0 in PVH mode and be able to create guests on it.

Will continue debug it.

thanks a lot for your time,
Mukesh



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