Re: [Qemu-devel] [RFC PATCH v1 0/5] Enable virtio-scsi boot from /dev/sgX

[Paolo Bonzini]

On 05/05/2017 17:03, Eric Farman wrote:
> We get a value of x3fffff when sending that to a scsi-disk from bios
> code.  That's fully emulated though, in scsi_disk_emulate_inquiry.  And
> that's the scenario that already works.
> 
> While there is indeed code in hw/scsi/scsi-generic.c to wire that in,
> that only happens after the I/O goes to the device itself.  The Block
> Limits page isn't supported [1] and thus it gets rejected with "invalid
> field in cdb".  We never get to that fixup code you reference, since the
> returned len is zero.
> 
> Should I be refactoring this code to always patch in that block limit
> regardless of a response from the host/device?  (That is, when page xb0
> isn't supported by the hw.)

What is the BLKSECTGET value you get?  Is there a sensible default value
that you can use when page 0xb0 isn't supported by the hardware?

Thanks,

Paolo