Re: [Qemu-devel] [PATCH 16/16] megasas: LSI Megaraid SAS emulation

[Hannes Reinecke <hare@suse.de>]

On 11/19/2010 03:06 PM, Markus Armbruster wrote:
> Jes Sorensen <Jes.Sorensen@redhat.com> writes:
> 
>> On 11/18/10 15:47, Hannes Reinecke wrote:
>>> This patch adds an emulation for the LSI Megaraid SAS HBA.
>>>
>>> Signed-off-by: Hannes Reinecke <hare@suse.de>
>>> ---
>>>  Makefile.objs |    2 +-
>>>  hw/megasas.c  | 1826 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>>  hw/mfi.h      | 1197 +++++++++++++++++++++++++++++++++++++
>>>  hw/pci_ids.h  |    2 +
>>>  hw/scsi.h     |    1 +
>>>  5 files changed, 3027 insertions(+), 1 deletions(-)
>>>  create mode 100644 hw/megasas.c
>>>  create mode 100644 hw/mfi.h
>>>
>>> diff --git a/Makefile.objs b/Makefile.objs
>>> index 15569af..54c6e02 100644
>>> --- a/Makefile.objs
>>> +++ b/Makefile.objs
>>> @@ -231,7 +231,7 @@ hw-obj-$(CONFIG_IDE_MACIO) += ide/macio.o
>>>  hw-obj-$(CONFIG_IDE_VIA) += ide/via.o
>>>  
>>>  # SCSI layer
>>> -hw-obj-y += lsi53c895a.o
>>> +hw-obj-y += lsi53c895a.o megasas.o
>>>  hw-obj-$(CONFIG_ESP) += esp.o
>>>  
>>>  hw-obj-y += dma-helpers.o sysbus.o isa-bus.o
>>
>> Just had a look through your patches and have to say nice work. Haven't
>> tested it though, but looks like a good step in the right direction.
>>
>> Only comment, as you are adding another SCSI driver, maybe it's time to
>> make the driver selection configurable, rather than hard coding the build?
> 
> What do you mean by that?
> 
> We hardcode lsi53c895a in two places where we really mean "default SCSI
> controller type": pc_pci_device_init(), which applies to "-drive
> if=scsi", and qemu_pci_hot_add_storage(), which applies to "pci_add
> storage if=scsi".  Not sure making that default configurable is worth
> it.
> 
> If you want more control than -drive and pci_add provice, use -device
> and device_add.

Idea is probably to have megasas the default SCSI controller, if
configured during compile time. Basically have a configure option
'--scsi-hba=megasas' or somesuch.

But then, you can 'easily' select the megasas HBA nowadays with

-drive file=XXX,if=none,id=d1 \
-device megasas,id=m1 \
-device scsi-disk,drive=d1

So not sure if it's worthwhile.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)