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Re: [Qemu-devel] [sneak preview] major scsi overhaul

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [sneak preview] major scsi overhaul
Date: Tue, 24 Nov 2009 12:59:29 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20091014 Fedora/3.0-2.8.b4.fc11 Lightning/1.0pre Thunderbird/3.0b4

On 11/16/09 19:53, Paul Brook wrote:
Capping the amount of memory required for a transfer *is* implemented, in both
LSI and virtio-blk.  The exception being SCSI passthrough where the kernel API
makes it impossible.

Well. Figured while doing more testing: The allowed request size is limited by the kernel, so scsi-generic requests larger than (currently) 128k fail.

Now, how to handle *that*? Is there some way to signal to the guest that the request was to big?

At least for known commands such as READ+WRITE which are likely to be big we could split the request internally into two (or more) if needed.


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