From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: "Nicholas A. Bellinger" <nab@linux-iscsi.org>,
target-devel <target-devel@vger.kernel.org>,
lf-virt <virtualization@lists.linux-foundation.org>,
kvm-devel <kvm@vger.kernel.org>,
qemu-devel <qemu-devel@nongnu.org>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
Zhi Yong Wu <wuzhy@cn.ibm.com>,
Anthony Liguori <aliguori@linux.vnet.ibm.com>,
Christoph Hellwig <hch@lst.de>, Hannes Reinecke <hare@suse.de>,
Jan Kiszka <jan.kiszka@siemens.com>,
Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Subject: Re: [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi
Date: Mon, 10 Sep 2012 08:42:15 +0200 [thread overview]
Message-ID: <504D8BC7.8070900@redhat.com> (raw)
In-Reply-To: <20120910062437.GD16819@redhat.com>
Il 10/09/2012 08:24, Michael S. Tsirkin ha scritto:
>> > I chose the backend name because, ideally, there would be no other
>> > difference. QEMU _could_ implement all the goodies in vhost-scsi (such
>> > as reservations or ALUA), it just doesn't do that yet.
>> >
>> > Paolo
> Then why do you say "It is used completely differently from
> virtio-scsi-pci"?
It is configured differently (and I haven't seen a proposal yet for how
to bridge the two), it does not interoperate, it has right now a
different set of features.
The "does not interoperate" bit is particularly important. Say QEMU
were to implement persistent reservations (right now only a vhost-scsi
feature). Then QEMU and vhost-scsi PR would not be interchangeable, a
reservation made by QEMU would not be visible in vhost and vice versa.
> Isn't it just a different backend?
>
> If yes then it should be a backend option, like it is
> for virtio-net.
You mean a -drive option? That would mean adding the logic to configure
vhost-scsi to the QEMU block layer, that's a completely different project...
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
kvm-devel <kvm@vger.kernel.org>,
Jan Kiszka <jan.kiszka@siemens.com>,
Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>,
qemu-devel <qemu-devel@nongnu.org>,
"Nicholas A. Bellinger" <nab@linux-iscsi.org>,
lf-virt <virtualization@lists.linux-foundation.org>,
Anthony Liguori <aliguori@linux.vnet.ibm.com>,
target-devel <target-devel@vger.kernel.org>,
Hannes Reinecke <hare@suse.de>, Zhi Yong Wu <wuzhy@cn.ibm.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [Qemu-devel] [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi
Date: Mon, 10 Sep 2012 08:42:15 +0200 [thread overview]
Message-ID: <504D8BC7.8070900@redhat.com> (raw)
In-Reply-To: <20120910062437.GD16819@redhat.com>
Il 10/09/2012 08:24, Michael S. Tsirkin ha scritto:
>> > I chose the backend name because, ideally, there would be no other
>> > difference. QEMU _could_ implement all the goodies in vhost-scsi (such
>> > as reservations or ALUA), it just doesn't do that yet.
>> >
>> > Paolo
> Then why do you say "It is used completely differently from
> virtio-scsi-pci"?
It is configured differently (and I haven't seen a proposal yet for how
to bridge the two), it does not interoperate, it has right now a
different set of features.
The "does not interoperate" bit is particularly important. Say QEMU
were to implement persistent reservations (right now only a vhost-scsi
feature). Then QEMU and vhost-scsi PR would not be interchangeable, a
reservation made by QEMU would not be visible in vhost and vice versa.
> Isn't it just a different backend?
>
> If yes then it should be a backend option, like it is
> for virtio-net.
You mean a -drive option? That would mean adding the logic to configure
vhost-scsi to the QEMU block layer, that's a completely different project...
Paolo
next prev parent reply other threads:[~2012-09-10 6:42 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-07 6:48 [PATCH 0/5] vhost-scsi: Add support for host virtualized target Nicholas A. Bellinger
2012-09-07 6:48 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-07 6:48 ` [PATCH 1/5] monitor: Rename+move net_handle_fd_param -> monitor_handle_fd_param Nicholas A. Bellinger
2012-09-07 6:48 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-07 6:48 ` Nicholas A. Bellinger
2012-09-07 6:48 ` [PATCH 2/5] vhost: Pass device path to vhost_dev_init() Nicholas A. Bellinger
2012-09-07 6:48 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-07 6:48 ` Nicholas A. Bellinger
2012-09-07 6:48 ` [PATCH 3/5] vhost-scsi: add -vhost-scsi host device for use with tcm-vhost Nicholas A. Bellinger
2012-09-07 6:48 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-07 6:48 ` Nicholas A. Bellinger
2012-09-07 6:48 ` [PATCH 4/5] virtio-scsi: Add start/stop functionality for vhost-scsi Nicholas A. Bellinger
2012-09-07 6:48 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-07 16:00 ` Paolo Bonzini
2012-09-07 16:00 ` [Qemu-devel] " Paolo Bonzini
2012-09-07 19:23 ` Nicholas A. Bellinger
2012-09-07 19:23 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-07 20:30 ` Paolo Bonzini
2012-09-07 20:30 ` [Qemu-devel] " Paolo Bonzini
2012-09-07 20:30 ` Paolo Bonzini
2012-09-08 22:40 ` Michael S. Tsirkin
2012-09-08 22:40 ` [Qemu-devel] " Michael S. Tsirkin
2012-09-10 6:16 ` Paolo Bonzini
2012-09-10 6:16 ` [Qemu-devel] " Paolo Bonzini
2012-09-10 6:24 ` Michael S. Tsirkin
2012-09-10 6:24 ` [Qemu-devel] " Michael S. Tsirkin
2012-09-10 6:42 ` Paolo Bonzini
2012-09-10 6:42 ` Paolo Bonzini [this message]
2012-09-10 6:42 ` [Qemu-devel] " Paolo Bonzini
2012-09-10 6:49 ` Michael S. Tsirkin
2012-09-10 6:49 ` [Qemu-devel] " Michael S. Tsirkin
2012-09-11 13:46 ` Anthony Liguori
2012-09-11 13:46 ` Anthony Liguori
2012-09-11 13:46 ` [Qemu-devel] " Anthony Liguori
2012-09-11 15:07 ` Michael S. Tsirkin
2012-09-11 15:07 ` [Qemu-devel] " Michael S. Tsirkin
2012-09-13 22:27 ` Nicholas A. Bellinger
2012-09-13 22:27 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-14 6:45 ` Paolo Bonzini
2012-09-14 6:45 ` [Qemu-devel] " Paolo Bonzini
2012-09-14 12:34 ` Michael S. Tsirkin
2012-09-14 12:34 ` [Qemu-devel] " Michael S. Tsirkin
2012-09-13 22:27 ` Nicholas A. Bellinger
2012-09-14 12:50 ` Michael S. Tsirkin
2012-09-14 12:50 ` [Qemu-devel] " Michael S. Tsirkin
2012-09-07 6:48 ` Nicholas A. Bellinger
2012-09-07 6:48 ` [PATCH 5/5] virtio-scsi: Set max_target=0 during vhost-scsi operation Nicholas A. Bellinger
2012-09-07 6:48 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-07 6:48 ` Nicholas A. Bellinger
2012-09-11 4:36 ` [PATCH 0/5] vhost-scsi: Add support for host virtualized target Asias He
2012-09-11 4:36 ` [Qemu-devel] " Asias He
2012-09-13 20:12 ` Nicholas A. Bellinger
2012-09-13 20:12 ` Nicholas A. Bellinger
2012-09-13 20:12 ` [Qemu-devel] " Nicholas A. Bellinger
2012-09-14 8:21 ` Paolo Bonzini
2012-09-14 8:21 ` [Qemu-devel] " Paolo Bonzini
2013-01-17 16:43 ` Michael S. Tsirkin
2013-01-17 16:43 ` [Qemu-devel] " Michael S. Tsirkin
2013-01-17 21:07 ` Nicholas A. Bellinger
2013-01-17 21:07 ` [Qemu-devel] " Nicholas A. Bellinger
2013-01-21 8:50 ` Michael S. Tsirkin
2013-01-21 8:50 ` [Qemu-devel] " Michael S. Tsirkin
2013-01-28 13:01 ` Paolo Bonzini
2013-01-28 13:11 ` Michael S. Tsirkin
2013-01-28 13:29 ` Paolo Bonzini
2013-01-28 13:36 ` Michael S. Tsirkin
2013-01-28 13:33 ` Paolo Bonzini
2013-01-28 13:39 ` Michael S. Tsirkin
2013-01-29 19:19 ` Nicholas A. Bellinger
2013-01-29 21:03 ` Paolo Bonzini
2013-01-29 22:38 ` Nicholas A. Bellinger
2013-01-29 22:38 ` Nicholas A. Bellinger
2013-01-29 21:03 ` Paolo Bonzini
2013-01-29 19:19 ` Nicholas A. Bellinger
2013-01-21 13:28 ` Anthony Liguori
2013-01-17 21:07 ` Nicholas A. Bellinger
2013-01-17 16:43 ` Michael S. Tsirkin
2013-04-02 3:28 ` [Qemu-devel] " Wenchao Xia
2013-04-02 3:28 ` Wenchao Xia
2013-04-02 5:07 ` Nicholas A. Bellinger
2013-04-02 5:07 ` Nicholas A. Bellinger
2013-04-02 5:07 ` Nicholas A. Bellinger
2013-04-02 3:28 ` Wenchao Xia
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