linux-kernel - Re: hv block drivers

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Message-ID: <4C7BD9A6.1090108@goop.org>
Date:	Mon, 30 Aug 2010 09:17:42 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Hank Janssen <hjanssen@...rosoft.com>,
	"'virtualization@...ts.osdl.org'" <virtualization@...ts.osdl.org>,
	linux-kernel@...r.kernel.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"Xen-devel@...ts.xensource.com" <Xen-devel@...ts.xensource.com>
Subject: Re: hv block drivers

 On 08/30/2010 07:43 AM, Arnd Bergmann wrote:
> Hi Hank,
>
> I wanted to follow up on the block device driver discussion we had at
> LinuxCon, based on some other input I got.
>
> What most people recommended was to make both the hv scsi and the
> hv ata code scsi device drivers, *not* make them standalone block
> drivers as I originally recommended.
>
> The main reason for this is consistent naming of the devices. We
> have a lot of user code that can deal with /dev/sd* devices, but
> introducing the /dev/vd* devices for virtio caused a lot of pain
> that you probably shouldn't have to go through.

We're having the same kind of problem with the Xen xvdX device naming. 
For a fully PV system it doesn't matter to much, but when you've got PV
drivers taking the place of a regular emulated hardware device it would
be nice to have a similar device name.

But there isn't a lot of similarity between the Xen block interface and
SCSI beyond the basic block transfer bits, so I was wondering how good a
match it would really be.

Have you investigated making virtio a scsi device?

    J
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