From: Paolo Bonzini <pbonzini@redhat.com>
To: Pankaj Gupta <pagupta@redhat.com>, Christoph Hellwig <hch@infradead.org>
Cc: Kevin Wolf <kwolf@redhat.com>, Rik van Riel <riel@redhat.com>,
Jan Kara <jack@suse.cz>,
Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
kvm-devel <kvm@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
Ross Zwisler <ross.zwisler@intel.com>,
Qemu Developers <qemu-devel@nongnu.org>,
Stefan Hajnoczi <stefanha@redhat.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
Nitesh Narayan Lal <nilal@redhat.com>
Subject: Re: [Qemu-devel] KVM "fake DAX" flushing interface - discussion
Date: Fri, 24 Nov 2017 14:20:22 +0100 [thread overview]
Message-ID: <9357a268-3801-367e-0aaa-a01163ea0cbc@redhat.com> (raw)
In-Reply-To: <919538865.34455774.1511528573448.JavaMail.zimbra@redhat.com>
On 24/11/2017 14:02, Pankaj Gupta wrote:
>
>>> - Suggestion by Paolo & Stefan(previously) to use virtio-blk makes sense
>>> if just
>>> want a flush vehicle to send guest commands to host and get reply
>>> after asynchronous
>>> execution. There was previous discussion [1] with Rik & Dan on this.
>>>
>>> [1] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg08373.html
>>
>> ... in fact, the virtio-blk device _could_ actually accept regular I/O
>> too. That would make it easier to boot from pmem. Is there anything
>> similar in regular hardware?
>
> there is existing block device associated(hard bind) with the pmem range.
> Also, comment by Christoph [1], about removing block device with DAX support.
> Still I am not clear about this. Am I missing anything here?
The I/O part of the blk device would only be used by the firmware. In
Linux, the different device id would bind the device to a different
driver that would only be used for flushing.
But maybe this idea makes no sense. :)
Paolo
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WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Pankaj Gupta <pagupta@redhat.com>, Christoph Hellwig <hch@infradead.org>
Cc: Dan Williams <dan.j.williams@intel.com>,
Rik van Riel <riel@redhat.com>,
Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
Kevin Wolf <kwolf@redhat.com>,
Haozhong Zhang <haozhong.zhang@intel.com>,
Jan Kara <jack@suse.cz>, kvm-devel <kvm@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
Ross Zwisler <ross.zwisler@intel.com>,
Qemu Developers <qemu-devel@nongnu.org>,
Stefan Hajnoczi <stefanha@redhat.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
ross zwisler <ross.zwisler@linux.intel.com>,
Nitesh Narayan Lal <nilal@redhat.com>
Subject: Re: [Qemu-devel] KVM "fake DAX" flushing interface - discussion
Date: Fri, 24 Nov 2017 14:20:22 +0100 [thread overview]
Message-ID: <9357a268-3801-367e-0aaa-a01163ea0cbc@redhat.com> (raw)
In-Reply-To: <919538865.34455774.1511528573448.JavaMail.zimbra@redhat.com>
On 24/11/2017 14:02, Pankaj Gupta wrote:
>
>>> - Suggestion by Paolo & Stefan(previously) to use virtio-blk makes sense
>>> if just
>>> want a flush vehicle to send guest commands to host and get reply
>>> after asynchronous
>>> execution. There was previous discussion [1] with Rik & Dan on this.
>>>
>>> [1] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg08373.html
>>
>> ... in fact, the virtio-blk device _could_ actually accept regular I/O
>> too. That would make it easier to boot from pmem. Is there anything
>> similar in regular hardware?
>
> there is existing block device associated(hard bind) with the pmem range.
> Also, comment by Christoph [1], about removing block device with DAX support.
> Still I am not clear about this. Am I missing anything here?
The I/O part of the blk device would only be used by the firmware. In
Linux, the different device id would bind the device to a different
driver that would only be used for flushing.
But maybe this idea makes no sense. :)
Paolo
next prev parent reply other threads:[~2017-11-24 13:20 UTC|newest]
Thread overview: 176+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1455443283.33337333.1500618150787.JavaMail.zimbra@redhat.com>
2017-07-21 6:56 ` KVM "fake DAX" flushing interface - discussion Pankaj Gupta
2017-07-21 6:56 ` [Qemu-devel] " Pankaj Gupta
2017-07-21 6:56 ` Pankaj Gupta
2017-07-21 9:51 ` Haozhong Zhang
2017-07-21 9:51 ` [Qemu-devel] " Haozhong Zhang
2017-07-21 9:51 ` Haozhong Zhang
2017-07-21 10:21 ` Pankaj Gupta
2017-07-21 10:21 ` [Qemu-devel] " Pankaj Gupta
2017-07-21 10:21 ` Pankaj Gupta
2017-07-21 12:12 ` Stefan Hajnoczi
2017-07-21 12:12 ` [Qemu-devel] " Stefan Hajnoczi
2017-07-21 13:29 ` Pankaj Gupta
2017-07-21 13:29 ` [Qemu-devel] " Pankaj Gupta
2017-07-21 13:29 ` Pankaj Gupta
2017-07-21 14:00 ` Rik van Riel
2017-07-21 14:00 ` [Qemu-devel] " Rik van Riel
2017-07-21 14:00 ` Rik van Riel
2017-07-21 15:58 ` Stefan Hajnoczi
2017-07-21 15:58 ` [Qemu-devel] " Stefan Hajnoczi
2017-07-22 19:34 ` Dan Williams
2017-07-22 19:34 ` [Qemu-devel] " Dan Williams
2017-07-22 19:34 ` Dan Williams
2017-07-23 14:04 ` Rik van Riel
2017-07-23 14:04 ` [Qemu-devel] " Rik van Riel
2017-07-23 14:04 ` Rik van Riel
2017-07-23 16:01 ` Dan Williams
2017-07-23 16:01 ` [Qemu-devel] " Dan Williams
2017-07-23 16:01 ` Dan Williams
2017-07-23 18:10 ` Rik van Riel
2017-07-23 18:10 ` [Qemu-devel] " Rik van Riel
2017-07-23 18:10 ` Rik van Riel
2017-07-23 20:10 ` Dan Williams
2017-07-23 20:10 ` [Qemu-devel] " Dan Williams
2017-07-23 20:10 ` Dan Williams
2017-07-24 10:23 ` Jan Kara
2017-07-24 10:23 ` [Qemu-devel] " Jan Kara
2017-07-24 10:23 ` Jan Kara
2017-07-24 12:06 ` Pankaj Gupta
2017-07-24 12:06 ` [Qemu-devel] " Pankaj Gupta
2017-07-24 12:06 ` Pankaj Gupta
2017-07-24 12:37 ` Jan Kara
2017-07-24 12:37 ` [Qemu-devel] " Jan Kara
2017-07-24 12:37 ` Jan Kara
2017-07-24 15:10 ` Dan Williams
2017-07-24 15:10 ` [Qemu-devel] " Dan Williams
2017-07-24 15:10 ` Dan Williams
2017-07-24 15:48 ` Jan Kara
2017-07-24 15:48 ` [Qemu-devel] " Jan Kara
2017-07-24 15:48 ` Jan Kara
2017-07-24 16:19 ` Dan Williams
2017-07-24 16:19 ` [Qemu-devel] " Dan Williams
2017-07-24 16:19 ` Dan Williams
2017-07-25 14:27 ` Pankaj Gupta
2017-07-25 14:27 ` [Qemu-devel] " Pankaj Gupta
2017-07-25 14:27 ` Pankaj Gupta
2017-07-25 14:46 ` Dan Williams
2017-07-25 14:46 ` [Qemu-devel] " Dan Williams
2017-07-25 14:46 ` Dan Williams
2017-07-25 20:59 ` Rik van Riel
2017-07-25 20:59 ` [Qemu-devel] " Rik van Riel
2017-07-26 13:47 ` Pankaj Gupta
2017-07-26 13:47 ` [Qemu-devel] " Pankaj Gupta
2017-07-26 13:47 ` Pankaj Gupta
2017-07-26 21:27 ` Rik van Riel
2017-07-26 21:27 ` [Qemu-devel] " Rik van Riel
2017-07-26 21:40 ` Dan Williams
2017-07-26 21:40 ` [Qemu-devel] " Dan Williams
2017-07-26 21:40 ` Dan Williams
2017-07-26 23:46 ` Rik van Riel
2017-07-26 23:46 ` [Qemu-devel] " Rik van Riel
2017-07-26 23:46 ` Rik van Riel
2017-07-27 0:54 ` Dan Williams
2017-07-27 0:54 ` [Qemu-devel] " Dan Williams
2017-07-27 0:54 ` Dan Williams
2017-10-31 7:13 ` Xiao Guangrong
2017-10-31 7:13 ` [Qemu-devel] " Xiao Guangrong
2017-10-31 7:13 ` Xiao Guangrong
2017-10-31 14:20 ` Dan Williams
2017-10-31 14:20 ` [Qemu-devel] " Dan Williams
2017-10-31 14:20 ` Dan Williams
2017-11-01 3:43 ` Xiao Guangrong
2017-11-01 3:43 ` [Qemu-devel] " Xiao Guangrong
2017-11-01 3:43 ` Xiao Guangrong
2017-11-01 4:25 ` Dan Williams
2017-11-01 4:25 ` [Qemu-devel] " Dan Williams
2017-11-01 4:25 ` Dan Williams
2017-11-01 6:46 ` Xiao Guangrong
2017-11-01 6:46 ` [Qemu-devel] " Xiao Guangrong
2017-11-01 6:46 ` Xiao Guangrong
2017-11-01 15:20 ` Dan Williams
2017-11-01 15:20 ` [Qemu-devel] " Dan Williams
2017-11-01 15:20 ` Dan Williams
2017-11-02 8:50 ` Xiao Guangrong
2017-11-02 8:50 ` [Qemu-devel] " Xiao Guangrong
2017-11-02 8:50 ` Xiao Guangrong
2017-11-02 16:30 ` Dan Williams
2017-11-02 16:30 ` [Qemu-devel] " Dan Williams
2017-11-02 16:30 ` Dan Williams
2017-11-03 6:21 ` Xiao Guangrong
2017-11-03 6:21 ` [Qemu-devel] " Xiao Guangrong
2017-11-03 6:21 ` Xiao Guangrong
2017-11-21 18:19 ` Rik van Riel
2017-11-21 18:19 ` [Qemu-devel] " Rik van Riel
2017-11-21 18:26 ` Dan Williams
2017-11-21 18:26 ` [Qemu-devel] " Dan Williams
2017-11-21 18:26 ` Dan Williams
2017-11-21 18:35 ` Rik van Riel
2017-11-21 18:35 ` [Qemu-devel] " Rik van Riel
2017-11-23 4:05 ` Xiao Guangrong
2017-11-23 4:05 ` [Qemu-devel] " Xiao Guangrong
2017-11-23 4:05 ` Xiao Guangrong
2017-11-23 16:14 ` Dan Williams
2017-11-23 16:14 ` [Qemu-devel] " Dan Williams
2017-11-23 16:14 ` Dan Williams
2017-11-23 16:28 ` Paolo Bonzini
2017-11-23 16:28 ` [Qemu-devel] " Paolo Bonzini
2017-11-23 16:28 ` Paolo Bonzini
2017-11-24 12:40 ` Pankaj Gupta
2017-11-24 12:40 ` [Qemu-devel] " Pankaj Gupta
2017-11-24 12:40 ` Pankaj Gupta
2017-11-24 12:44 ` Paolo Bonzini
2017-11-24 12:44 ` [Qemu-devel] " Paolo Bonzini
2017-11-24 12:44 ` Paolo Bonzini
2017-11-24 13:02 ` [Qemu-devel] " Pankaj Gupta
2017-11-24 13:02 ` Pankaj Gupta
2017-11-24 13:20 ` Paolo Bonzini [this message]
2017-11-24 13:20 ` Paolo Bonzini
2017-11-28 18:03 ` Dan Williams
2017-11-28 18:03 ` [Qemu-devel] " Dan Williams
2017-11-28 18:03 ` Dan Williams
2018-01-13 6:23 ` Pankaj Gupta
2018-01-13 6:23 ` [Qemu-devel] " Pankaj Gupta
2018-01-13 6:23 ` Pankaj Gupta
2018-01-17 16:17 ` Dan Williams
2018-01-17 16:17 ` [Qemu-devel] " Dan Williams
2018-01-17 16:17 ` Dan Williams
2018-01-17 17:31 ` Pankaj Gupta
2018-01-17 17:31 ` [Qemu-devel] " Pankaj Gupta
2018-01-17 17:31 ` Pankaj Gupta
2018-01-18 16:53 ` David Hildenbrand
2018-01-18 16:53 ` [Qemu-devel] " David Hildenbrand
2018-01-18 16:53 ` David Hildenbrand
2018-01-18 17:38 ` Dan Williams
2018-01-18 17:38 ` [Qemu-devel] " Dan Williams
2018-01-18 17:38 ` Dan Williams
2018-01-18 17:48 ` David Hildenbrand
2018-01-18 17:48 ` [Qemu-devel] " David Hildenbrand
2018-01-18 17:48 ` David Hildenbrand
2018-01-18 18:45 ` Dan Williams
2018-01-18 18:45 ` [Qemu-devel] " Dan Williams
2018-01-18 18:45 ` Dan Williams
2018-01-18 18:54 ` Pankaj Gupta
2018-01-18 18:54 ` [Qemu-devel] " Pankaj Gupta
2018-01-18 18:54 ` Pankaj Gupta
2018-01-18 18:59 ` Dan Williams
2018-01-18 18:59 ` [Qemu-devel] " Dan Williams
2018-01-18 18:59 ` Dan Williams
2018-01-18 19:36 ` Pankaj Gupta
2018-01-18 19:36 ` [Qemu-devel] " Pankaj Gupta
2018-01-18 19:36 ` Pankaj Gupta
2018-01-18 19:48 ` Dan Williams
2018-01-18 19:48 ` [Qemu-devel] " Dan Williams
2018-01-18 19:48 ` Dan Williams
2018-01-18 19:51 ` David Hildenbrand
2018-01-18 19:51 ` [Qemu-devel] " David Hildenbrand
2018-01-18 19:51 ` David Hildenbrand
2018-01-18 20:11 ` Dan Williams
2018-01-18 20:11 ` [Qemu-devel] " Dan Williams
2018-01-18 20:11 ` Dan Williams
2017-11-06 7:57 ` [Qemu-devel] " Pankaj Gupta
2017-11-06 7:57 ` Pankaj Gupta
2017-11-06 16:57 ` Dan Williams
2017-11-06 16:57 ` Dan Williams
2017-11-07 11:21 ` Pankaj Gupta
2017-11-07 11:21 ` Pankaj Gupta
2017-11-07 11:21 ` Pankaj Gupta
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