From: Arnd Bergmann <arnd@arndb.de>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: xiaohui.xin@intel.com, netdev@vger.kernel.org,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@elte.hu,
davem@davemloft.net, jdike@linux.intel.com
Subject: Re: [RFC][PATCH v3 1/3] A device for zero-copy based on KVM virtio-net.
Date: Wed, 14 Apr 2010 22:52:43 +0200 [thread overview]
Message-ID: <201004142252.43931.arnd@arndb.de> (raw)
In-Reply-To: <20100414204003.GC11321@redhat.com>
On Wednesday 14 April 2010 22:40:03 Michael S. Tsirkin wrote:
> On Wed, Apr 14, 2010 at 10:39:49PM +0200, Arnd Bergmann wrote:
> > Well, if the guest not only wants to send data but also receive
> > frames coming from other machines, they need to get from the kernel
> > into qemu, and the only way I can see for doing that is to read
> > from this device if there is no vhost support around on the new
> > machine.
> >
> > Maybe we're talking about different things here.
>
> mpassthrough is currently useless without vhost.
> If the new machine has no vhost, it can't use mpassthrough :)
Ok. Is that a planned feature though? vhost is currently limited
to guests with a virtio-net driver and even if you extend it to other
guest emulations, it will probably always be a subset of the qemu
supported drivers, but it may be useful to support zero-copy on other
drivers as well.
Arnd
next prev parent reply other threads:[~2010-04-14 20:53 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-09 9:37 [RFC][PATCH v3 0/3] Provide a zero-copy method on KVM virtio-net xiaohui.xin
2010-04-09 9:37 ` [RFC][PATCH v3 1/3] A device for zero-copy based " xiaohui.xin
2010-04-09 9:37 ` [RFC][PATCH v3 2/3] Provides multiple submits and asynchronous notifications xiaohui.xin
2010-04-09 9:37 ` [RFC][PATCH v3 3/3] Let host NIC driver to DMA to guest user space xiaohui.xin
2010-04-14 14:55 ` [RFC][PATCH v3 1/3] A device for zero-copy based on KVM virtio-net Arnd Bergmann
2010-04-14 15:26 ` Michael S. Tsirkin
2010-04-14 15:57 ` Arnd Bergmann
2010-04-14 16:16 ` Michael S. Tsirkin
2010-04-14 16:35 ` Arnd Bergmann
2010-04-14 20:31 ` Michael S. Tsirkin
2010-04-14 20:39 ` Arnd Bergmann
2010-04-14 20:40 ` Michael S. Tsirkin
2010-04-14 20:52 ` Arnd Bergmann [this message]
2010-04-15 9:01 ` Xin, Xiaohui
2010-04-15 9:03 ` Michael S. Tsirkin
2010-04-22 8:24 ` xiaohui.xin
2010-04-22 8:29 ` Xin, Xiaohui
2010-04-22 8:37 ` Re:[RFC][PATCH v3 2/3] Provides multiple submits and asynchronous notifications xiaohui.xin
2010-04-22 9:49 ` [RFC][PATCH " Michael S. Tsirkin
2010-04-23 7:08 ` xiaohui.xin
2010-04-24 19:32 ` [RFC][PATCH " Michael S. Tsirkin
2010-04-15 15:06 ` [RFC][PATCH v3 1/3] A device for zero-copy based on KVM virtio-net Arnd Bergmann
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