Re: [Xen-devel] [PATCH 0/5] pvSCSI (SCSI pass through) driver

[Jun Kamada <kama@xxxxxxxxxxxxxx>]

Keir-san,

On Wed, 24 Oct 2007 08:42:38 +0100
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> On 24/10/07 07:22, "Jun Kamada" <kama@xxxxxxxxxxxxxx> wrote:
> 
> >> Anyway, the right answer is to ensure that your structures compile the same
> >> whether compiled with 32-bit or 64-bit gcc. Check the structure sizes,
> >> fields sizes and field offsets.
> > 
> > You showed me two options in previous email; i.) all the shared-memory
> > structures defined in vscsiif.h compile identically for 32-bit and
> > 64-bit mode, ii.) to detect the frontend's 'bitness' in scsiback and
> > optionally do 32-to-64 or 64-to-32 conversion.
> > 
> > I consider that current VBD implementation takes option ii.), however
> > you recommended me to take option i.) for pvSCSI driver.
> > Is my understanding right?
> 
> Yes. It was an accident we ended up with structures compiling differently on
> 32- vs 64-bit. By the time we discovered it was an issue, we couldn't break
> backward compatibility.

I understood. I'll try to modify the pvSCSI driver by option i.).

Best regards,

-----
Jun Kamada



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