[Xen-devel] Re: [RFC] Virtual disk configuration, PV vs. emulated, backward compatibility etc

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

On 07/27/2010 05:58 PM, Ian Campbell wrote:
> The sd* syntax is not covered. It's unclear if this is used in the wild
> or what the existing semantics of emul= are for SCSI devices. If someone
> cares to investigate the existing behaviour then it can be added.
I don't know what semantics xl uses for SCSI devices, but I know that 
we've seen bugs about SCSI emulation so it is sometimes used, and this 
is the semantics that it should use given your IDE example:
        sda => d0p0,pv=true,emul=scsi0.0,_vdevice=8:0
        sdb => d0p0,pv=true,emul=scsi0.1,_vdevice=8:16

where the first number is the bus and the second is the unit as passed 
to -drive.  The second number goes from 0 to 7 (that's what QEMU does at 
least).
Paolo

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