[Xen-devel] [PATCH 0/6] pvSCSI (SCSI pass through) driver

[Jun Kamada <kama@xxxxxxxxxxxxxx>]

Keir-san,

I have finished the modification of the driver by option i.).
The pvSCSI driver can work on heterogeneous (x86_32 and x86_64)
environment.

I will attach total six patches on following mail.

Best regards,


On Thu, 25 Oct 2007 10:59:31 +0900
Jun Kamada <kama@xxxxxxxxxxxxxx> wrote:

> 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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-----
Jun Kamada



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