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[Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation
From: |
Hannes Reinecke |
Subject: |
[Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation |
Date: |
Tue, 27 Oct 2009 16:26:14 +0100 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20081227) |
Hi all,
this patchset implements an emulation for the megaraid_sas HBA.
It provides emulates an LSI MegaRAID SAS 8708EM2 HBA, ie
presenting to the guest a virtual SCSI adapter.
Internally it is using aio for read/write requests and
either SG_IO or SCSI command emulation for everything else.
The reason for choosing the megaraid_sas HBA and not, say,
implementing a virtio scsi interface is because:
- the megaraid_sas is using a very simple firmware interface,
comparable to virtio
- the HBA driver are already existent, so I only have to
write the backend :-)
The device can be accessed by
-drive if=raid,file=XXX
In order to support SCSI command emulation I had to update /
patch up the existing SCSI disk support. This might be
not to everyones taste, so I'm open to alternative
suggestions.
But I certainly do _not_ want to update the SCSI disk
emulation, as this is really quite tied to the SCSI parallel
interface used by the old lsi53c895a.c.
Plus it doesn't do scatter-gather list handling, which
is quite impossible to fix without proper documentation.
Of course, if anyone else would step in here, I won't object :-)
It currently runs guests with 2.6.27 and up; Windows XP
support is not quite there yet. Anything else might work;
if not, enable debugging and sent me the logfile.
As usual, comment / suggestions etc welcome.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
address@hidden +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
- [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation,
Hannes Reinecke <=
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Gerd Hoffmann, 2009/10/27
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Hannes Reinecke, 2009/10/28
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Avi Kivity, 2009/10/28
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Christoph Hellwig, 2009/10/28
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Gerd Hoffmann, 2009/10/28
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Gerd Hoffmann, 2009/10/28
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Hannes Reinecke, 2009/10/28
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Christoph Hellwig, 2009/10/29
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Gerd Hoffmann, 2009/10/29
- Re: [Qemu-devel] [PATCH 0/4] megaraid_sas HBA emulation, Gerd Hoffmann, 2009/10/29