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Re: [Qemu-devel] [PATCH 35/35] scsi-disk: add scsi-block for device pass


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 35/35] scsi-disk: add scsi-block for device passthrough
Date: Mon, 24 Oct 2011 17:28:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0) Gecko/20110927 Thunderbird/7.0

On 10/24/2011 05:28 PM, Kevin Wolf wrote:
scsi-block is a new device that supports device passthrough of Linux
>  block devices (i.e. /dev/sda, not /dev/sg0).  It uses SG_IO for commands
>  other than I/O commands, and regular AIO read/writes for I/O commands.
>  Besides being simpler to configure (no mapping required to scsi-generic
>  device names), this removes the need for a large bounce buffer and,
>  in the future, will get scatter/gather support for free from scsi-disk.
>
>  Signed-off-by: Paolo Bonzini<address@hidden>

This doesn't seem to use much of scsi-disk, so what about exporting
&scsi_disk_reqops and adding a separate file scsi-block.c? Would make
things a bit more symmetrical between scsi-disk and scsi-generic.

Or will future patches add code that depends on internal interfaces of
scsi-disk?

It already uses some internal interfaces: scsi_initfn, scsi_disk_reset, scsi_destroy, sizeof(SCSIDiskState).

Paolo



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