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From: Chris Takemura <ctakemura@axcient.com>
Date: Mon, 16 Mar 2015 16:35:11 -0700
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Subject: Re: [Qemu-devel] lsi53c895a lsi_do_dma assertion failure
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To: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel <qemu-devel@nongnu.org>

On 3/17/15, 2:21 AM, "Paolo Bonzini" <pbonzini@redhat.com> wrote:

>
>On 16/03/2015 16:59, Chris Takemura wrote:
>> Hi everyone,
>>=20
>> We're using qemu as a device model for xen 4.4.  Lately we've been
>> having qemu crashes with this output:
>>=20
>> lsi_scsi: error: Unhandled writeb 0xff =3D 0x0
>>=20
>> lsi_scsi: error: Unhandled writeb 0x100 =3D 0x0
>>=20
>> lsi_scsi: error: Unhandled writeb 0x101 =3D 0x0
>>=20
>> lsi_scsi: error: Unhandled writeb 0x102 =3D 0x0
>>=20
>> qemu-system-i386: /home/chris/qemu/hw/scsi/lsi53c895a.c:541: lsi_do_dma:
>> Assertion `s->current' failed.
>>=20
>>=20
>> This is with a clean qemu-2.1.0 tree, built for Xen.
>>=20
>> I confirmed that commit d1d74664ea99cdc571afee12e31c8625595765b0 is
>> present in our code.  (As described in the thread that begins
>> with=20
>>http://qemu-devel.nongnu.narkive.com/LtGj28sZ/win2k8-32-bit-mix-of-ide-an
>>d-scsi-assertion ).
>
>What guest is this?  The answer is basically "do not use this device
>model", it is old and buggy and newer guests do not even ship the driver
>anymore.

Windows 2008 R2.

I agree, but I don't know how to specify a different device emulation for
xen.  If you have some tips on that, I'd be grateful.