Re: [Qemu-block] [Qemu-devel] Migration sometimes fails with IDE and Qemu 2.2.1

[Peter Lieven]

Am 11.04.2015 um 15:11 schrieb Peter Lieven:
> Am 09.04.2015 um 17:17 schrieb Paolo Bonzini:
>> On 09/04/2015 16:54, Peter Lieven wrote:
>>> #define BM_MIGRATION_COMPAT_STATUS_BITS \
>>>         (IDE_RETRY_DMA | IDE_RETRY_PIO | \
>>>         IDE_RETRY_READ | IDE_RETRY_FLUSH)
>>>
>>> Why is there no IDE_RETRY_WRITE ?
>> Because that's represented by none of read and flush being set. :)
>>
>>> Honestly, I have not yet understood that that
>>> BM_MIGRATION_COMPAT_STATUS_BITS is for.
>> It's just for migrations while the VM is stopped due to I/O errors
>> (rerror=stop/werror=stop).
> My migration problem seems to be a regression or incompatiblity in kvm-kmod. 
> I started debugging
> with an old kvm module accidently. It seems to work with the old module 
> shipped
> with the kernel (3.13) and fails with (3.19).

3.17 (kvm-kmod master) also seems to work. I had to move to 3.19 some time ago 
to
mititage another bug that triggered a new check in Qemu.

kvm-kmod next currently does not compile under my 3.13 host kernel. And 
according to
the buildbot output for kvm-kmod it seems to fail for almost all kernels <= 
3.18.

I will keep my tests running with 3.17 kvm-kmod. Currently it has done nearly 
1000 migrations
in a row without crashing.

Peter