Re: [Qemu-devel] [PATCH] Megasas HBA emulation and SCSI update v.2

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

On Mon, 2010-11-22 at 11:34 +0100, Hannes Reinecke wrote:
> On 11/22/2010 11:15 AM, Hannes Reinecke wrote:
> > 
> > The is the second version of the megasas patchset; changes are:
> > v1 -> v2:
> > - Include suggestions (and acked-by) from Christoph Hellwig
> > - Updated patch description as requested by Gerd Hoffman
> > - Use generic iov_size() implementation
> > - Drop old patches
> > - Make SCSI HBA configurable
> > 
> > This patchset can be found at
> > 
> > git://repo.or.cz/qemu/megasas.git
> > branch megasas.v2
> > 
> Hey, sorry, just found out I've omitted the series numbers
> in the patchset. But reposting the entire patchset just
> to get the numbers back is a bit of a waste.
> So please check with the above git tree or
> use this as a series file:
> > 
> > Hannes Reinecke (15):
> >   scsi: Increase the number of possible devices
> >   scsi: Return SAM status codes
> >   scsi: INQUIRY VPD fixes
> >   scsi: Move sense handling into the driver
> >   scsi-disk: Remove duplicate cdb parsing
> >   scsi: Update sense code handling
> >   lsi53c895a: Rename 'sense' to 'status'
> >   scsi-disk: Allocate iovec dynamically
> >   scsi: Use 'SCSIRequest' directly
> >   scsi-disk: add data direction checking
> >   Remove 'bus' argument from SCSI command completion callbacks
> >   scsi: Implement 'get_sense' callback
> >   scsi: Implement alloc_req_iov callback
> >   megasas: LSI Megaraid SAS emulation
> >   Make SCSI HBA configurable
> > 
> 

Hey Hannes,

Just a heads up, I noticed that the latest v2 megasas w/ scsi-generic ->
TCM_loop appears to be broken on a Windows7 (Build 7600) guest, which
hangs during boot -> LUN scan with the following:

truelife:/usr/src/qemu-kvm.git# ./x86_64-softmmu/qemu-system-x86_64 -m 512 -boot c ~/windows7.img \
		-drive if=none,id=mydisk1,file=/dev/sg4 -device megasas,id=raid
		-device scsi-generic,bus=raid.0,scsi-id=1,drive=mydisk1

megasas: Using 80 sges, 1000 cmds, raid mode
megasas: Reset
megasas: Mapping MMIO region 0 at f2040000
megasas: Mapping IO region 2 at 0000c200
megasas: Mapping QUEUE region 3 at f2080000
megasas: Mapping MMIO region 0 at f2040000
megasas: Mapping IO region 2 at 0000c200
megasas: Mapping QUEUE region 3 at f2080000
megasas: Mapping MMIO region 0 at f2040000
megasas: Mapping IO region 2 at 0000c200
megasas: Mapping QUEUE region 3 at f2080000
megasas: readl mmio 0xb0
megasas: writel mmio 20: 7
megasas: Reset
megasas: readl mmio 0x20
megasas: writel mmio 40: 1ff9c041
megasas: Received frame addr 1ff9c000 count 32
megasas: MFI cmd 0 context 0 count 32
megasas: Return new frame 0 cmd 0x7f7711654330
megasas: Enqueue frame 0 count 32 context 0 tail 0 busy 1
megasas: MFI init firmware: xfer len 0 pa 0
megasas: MFI init firmware: queue at f000ff53f000e2c3 len -268370093 head f000ff53f000ff53 tail f000ff53f000ff53
megasas: Complete frame context 0


Oddly enough, after trying a number of older megasas versions with this
particular Windows 7 guest w/ scsi-generic -> TCM_Loop, the last version
that I can find which is still working is this branch from May, on what
is effectively v1.0 megasas code.

http://git.kernel.org/?p=virt/kvm/nab/qemu-kvm.git;a=shortlog;h=refs/heads/windows7-megasas-working

Anyways, I have not had a chance to track this down myself and wanted
to see if you had any ideas..

--nab