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Date: Sat, 18 May 2013 20:40:17 +0400
From: Michael Tokarev <mjt@tls.msk.ru>
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Subject: Re: [Qemu-devel] IDE TRIM bug on at least PPC target
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>

18.05.2013 19:53, Paolo Bonzini wrote:
> Il 18/05/2013 16:39, Michael Tokarev ha scritto:
>> And I don't really know how to add scsi device to qemu ppc.
>>
>>  qemu-system-ppc -drive file=foo,if=scsi


> For example:
> 
> qemu-system-ppc -drive file=foo,if=none,id=hd -device \
>   megasas -device scsi-disk,drive=hd

This creates megasas device in the guest, but it does
not work still, at least with the debian wheezy (current)
kernel.  It tries to load megaraid_sas module, and is
getting this:

 scsi3 : LSI SAS based MegaRAID driver
 irq 22: nobody cared (try booting with the "irqpool" option)
 ...
 --- Exception: 501 at __do_softirq+0x6c/0x1dc
     LR = call_do_softirq+0x14/0x24
 ...
 --- Exception: 501 at megasas_fire_cmd_ppc+0x28/0x2c [megaraid_sas]
     LR = megasas_issue_dcmd+0x28/0x38 [megaraid_sas]
 ...
 Disabling IRQ #22
 scsi 3:0:0:0: megasas: RESET cmd=12 retries=0
 megasas: [ 0]waiting for 1 commands to complete
 megasas: [10]waiting for 1 commands to complete
 INFO: task modprobe:4017 blocked for more than 120 seconds.
 ...

and so on.

So I'm afraid megasas isn't exactly useful in this situation.

Thanks,

/mjt