Re: [Xen-devel] Xen 4.5 random freeze question

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 14 Nov 2014, Andrii Tseglytskyi wrote:
> On Fri, Nov 14, 2014 at 4:35 PM, Stefano Stabellini
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> > On Fri, 14 Nov 2014, Andrii Tseglytskyi wrote:
> >> Hi,
> >>
> >> I observe system freeze on latest xen/master branch.
> >>
> >> My setup is:
> >>
> >> - Jacinto 6 evm board (OMAP5)
> >> - Latest Xen 4.5.0-rc2 as hypervisor
> >> - Linux 3.8 as dom0, running on 2 vcpus
> >> - Android 4.3 as domU (running on Linux kernel 3.8, 2 vcpus)
> >> - XSM feature is disabled
> >> - gcc version 4.7.3 20130328 (prerelease) (crosstool-NG
> >> linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC 2013.04) as cross
> >> compiler
> >>
> >> Freeze occurs in random moment of time during creation of domU domain.
> >> Even Xen console may be not available after freeze.
> >> Can someone suggest - what it can be? Maybe some weak places in new
> >> code? Maybe new gic, which was reworked a lot or something else?
> >>
> >> Thank you in advance for any suggestions.
> >
> > Is this really 3.8 or 3.18?
> 
> We have 3.8 in both dom0 and domU
> 
> > 3.8 is pretty old and doesn't have any of
> > the fixes to be able to safely do dma involving guest pages to
> > non-coherent devices.
> 
> This is a good point. Now we are migrating to 3.12 kernel in dom0. But
> Android will remain on 3.8. Will it help ?
> Maybe you can point me to any tree with proper DMA fixes? Note: if you
> are talking about SWIOTLB - we have your latest one, retrieved from
> git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen.git
> branch:swiotlb-xen-9.1

The last and most stable series is:

http://marc.info/?l=linux-kernel&m=141579241729749&w=2

But thinking more about this, I doubt that it is a dma problem, because
you would most probably see various kind of error messages, not a
freeze.


> > Where are you storing the guest disk images?
> 
> SATA drive, dedicated to dom0, its controller has its own DMA

Are they on file or on lvm volumes?

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