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Date: Sat, 11 Apr 2015 15:11:04 +0200
From: Peter Lieven <pl@kamp.de>
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Subject: Re: [Qemu-devel] [Qemu-block] Migration sometimes fails with IDE
 and Qemu 2.2.1
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To: Paolo Bonzini <pbonzini@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: John Snow <jsnow@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, qemu-block@nongnu.org

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).

Any ideas, Paolo?

Peter