linux-kernel - RE: [PATCH 1/3] A device for zero-copy based on KVM virtio-net.

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Message-ID: <97F6D3BD476C464182C1B7BABF0B0AF5C183234A@shzsmsx502.ccr.corp.intel.com>
Date:	Wed, 7 Apr 2010 10:41:08 +0800
From:	"Xin, Xiaohui" <xiaohui.xin@...el.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jdike@...user-mode-linux.org" <jdike@...user-mode-linux.org>,
	"yzhao81@...il.com" <yzhao81@...il.com>
Subject: RE: [PATCH 1/3] A device for zero-copy based on KVM virtio-net.

Michael,
 
>> Qemu needs a userspace write, is that a synchronous one or
>>asynchronous one?

>It's a synchronous non-blocking write.
Sorry, why the Qemu live migration needs the device have a userspace write?
how does the write operation work? And why a read operation is not cared here?

Thanks
Xiaohui
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