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From: "Denis V. Lunev" <den@openvz.org>
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Date: Mon, 11 Jan 2016 17:26:19 +0300
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Subject: Re: [Qemu-devel] [PATCH 1/1] block: fix inability to start VM with
 native AIO
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To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Kevin Wolf <kwolf@redhat.com>, qemu-devel@nongnu.org

On 01/11/2016 04:46 PM, Christian Borntraeger wrote:
> On 12/22/2015 07:59 AM, Denis V. Lunev wrote:
>> error: Failed to start domain rhel7
>> error: internal error: process exited while connecting to monitor:
>>      2015-12-22T06:55:18.812637Z qemu-system-x86_64:
>>      -drive file=/var/lib/libvirt/images/rhel7.qcow2,if=none,
>>          id=drive-scsi0-0-0-0,format=qcow2,cache=none,aio=native:
>>      aio=native was specified, but it requires cache.direct=on,
>>      which was not specified.
>>
>> cache=none option was specified as seen above while the VM is unable to
>> start. The patch properly passed BDRV_O_NOCACHE to underlying layer.
>>
>> The problem is revealed with
>>      commit d657c0c289e944fc22289f5c318f48da87d79dcb
>>      Author: Kevin Wolf <kwolf@redhat.com>
>>      Date:   Tue Dec 15 11:35:36 2015 +0100
>>
>>          raw-posix: Make aio=native option binding
>>
>> Signed-off-by: Denis V. Lunev <den@openvz.org>
>> CC: Kevin Wolf <kwolf@redhat.com>
> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
>
> Without this patch all libvirt xmls with
> cache='none' io='native'
> are broken. We should apply this patch (or something else)
> soon.
>
exactly!