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Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive |
Date: |
Thu, 23 Aug 2012 11:08:22 +0100 |
On Thu, Aug 23, 2012 at 11:03 AM, Paolo Bonzini <address@hidden> wrote:
> 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.
This issue affects passthrough: either an entire sg device or at least
a SG_IO ioctl (e.g. a non-READ/WRITE SCSI command).
To reproduce it, check host queue limits and guest virtio-scsi queue
limits. Then pick a command that can exceed the limits and try it
from inside the guest :).
Stefan
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, (continued)
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Paolo Bonzini, 2012/08/21
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Cong Meng, 2012/08/21
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Stefan Hajnoczi, 2012/08/21
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Paolo Bonzini, 2012/08/21
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Cong Meng, 2012/08/22
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Paolo Bonzini, 2012/08/22
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Stefan Hajnoczi, 2012/08/22
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Paolo Bonzini, 2012/08/22
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Cong Meng, 2012/08/23
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Paolo Bonzini, 2012/08/23
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Paolo Bonzini, 2012/08/23
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Stefan Hajnoczi, 2012/08/23
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Nicholas A. Bellinger, 2012/08/23
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Paolo Bonzini, 2012/08/24
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Hannes Reinecke, 2012/08/24
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Stefan Hajnoczi, 2012/08/24
- Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Paolo Bonzini, 2012/08/24
Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Stefan Hajnoczi, 2012/08/21
Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive, Blue Swirl, 2012/08/21