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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ? |
Date: | Wed, 02 Nov 2011 17:34:03 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1 |
On 11/02/2011 05:26 PM, Thomas Schmitt wrote:
Hi, Paolo Bonzini wrote:I suggest trying with 1.0-rc (origin/master).Am i on the right track with git clone git://git.qemu.org/qemu.git ?
Yes.
scsi-block uses read+write for READ/WRITE CDBs and SG_IO for everything else.That sounds scary to me. On real Linux systems it is not advisable to mix SG_IO and block device driver. At least not with optical media. Often the block device does not learn about status changes until the tray gets ejected and reloaded manually or by the block device driver. If i load it by START/STOP UNIT via SG_IO, then the block device driver believes there are no readable blocks on the medium.
Ah, I didn't know this. Probably it's because I didn't test on a machine with a tray that can load, only a laptop. We certainly can switch more commands from pass-through to emulated (including START/STOP UNIT).
Paolo
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