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

[Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>]

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

> Where are you storing the guest disk images?

SATA drive, dedicated to dom0, its controller has its own DMA

Regards,
Andri



-- 

Andrii Tseglytskyi | Embedded Dev
GlobalLogic
www.globallogic.com

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