From: Paolo Bonzini <pbonzini@redhat.com>
To: Cong Meng <mc@linux.vnet.ibm.com>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
zwanp@cn.ibm.com, linuxram@us.ibm.com, qemu-devel@nongnu.org,
virtualization@lists.linux-foundation.org
Subject: Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive
Date: Thu, 23 Aug 2012 12:03:32 +0200 [thread overview]
Message-ID: <5035FFF4.4040603@redhat.com> (raw)
In-Reply-To: <5035F873.6090305@linux.vnet.ibm.com>
Il 23/08/2012 11:31, Cong Meng ha scritto:
>> For disks, this should be fixed simply by using scsi-block instead of
>> scsi-generic.
>>
>> CD-ROMs are indeed more complicated because burning CDs cannot be done
>> with syscalls. :/
>
> So, as the problem exist to CD-ROM, I will continue to get these patches
> move on.
I'm still trying to understand the extent of the problem.
The problem occurs for _USB_ CD-ROMs according to Ben. Passthrough of
USB storage devices should be done via USB passthrough, not virtio-scsi.
If we do USB passthrough via the SCSI layer we miss on all the quirks
that the OS may do based on the USB product/vendor pairs. There's no
end to these, and some of the quirks may cause the device to lock up or
corruption.
I'd rather see a reproducer using SAS/ATA/ATAPI disks before punting.
Paolo
next prev parent reply other threads:[~2012-08-23 10:03 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-21 8:23 [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive Cong Meng
2012-08-21 8:23 ` [Qemu-devel] [PATCH 2/2 v1] virtio-scsi: set per-LUN queue limits for sg devices Cong Meng
2012-08-21 9:56 ` Stefan Hajnoczi
2012-08-21 8:48 ` [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive Paolo Bonzini
2012-08-21 9:41 ` Cong Meng
2012-08-21 9:52 ` Stefan Hajnoczi
2012-08-21 10:14 ` Paolo Bonzini
2012-08-22 11:04 ` Cong Meng
2012-08-22 12:09 ` Paolo Bonzini
2012-08-22 13:13 ` Stefan Hajnoczi
2012-08-22 14:13 ` Paolo Bonzini
2012-08-23 9:31 ` Cong Meng
2012-08-23 10:03 ` Paolo Bonzini [this message]
2012-08-23 10:08 ` Stefan Hajnoczi
2012-08-23 10:52 ` Paolo Bonzini
2012-08-23 12:08 ` Stefan Hajnoczi
2012-08-24 0:45 ` Nicholas A. Bellinger
2012-08-24 7:56 ` Paolo Bonzini
2012-08-24 10:43 ` Hannes Reinecke
2012-08-24 9:05 ` Stefan Hajnoczi
2012-08-24 9:14 ` Paolo Bonzini
2012-08-21 9:49 ` Stefan Hajnoczi
2012-08-21 18:31 ` Blue Swirl
2012-08-22 8:25 ` Stefan Hajnoczi
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