linux-kernel - Re: [RFC PATCH] vhost-blk: An in-kernel accelerator for virtio-blk

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Date:	Thu, 28 Jul 2011 10:47:40 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Liu Yuan <namei.unix@...il.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Avi Kivity <avi@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] vhost-blk: An in-kernel accelerator for virtio-blk

On Thu, Jul 28, 2011 at 10:29:05PM +0800, Liu Yuan wrote:
> From: Liu Yuan <tailai.ly@...bao.com>
> 
> Vhost-blk driver is an in-kernel accelerator, intercepting the
> IO requests from KVM virtio-capable guests. It is based on the
> vhost infrastructure.
> 
> This is supposed to be a module over latest kernel tree, but it
> needs some symbols from fs/aio.c and fs/eventfd.c to compile with.
> So currently, after applying the patch, you need to *recomplie*
> the kernel.
> 
> Usage:
> $kernel-src: make M=drivers/vhost
> $kernel-src: sudo insmod drivers/vhost/vhost_blk.ko
> 
> After insmod, you'll see /dev/vhost-blk created. done!

You'll need to send the changes for existing code separately.

If you're going mostly for raw blockdevice access just calling
submit_bio will shave even more overhead off, and simplify the
code a lot.
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