From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: lspci says: "SCSI storage controller: Qumranet, Inc. Virtio block
 	device". Is it really?
Date: Mon, 19 Oct 2009 21:01:12 +0200
Message-ID: <4ADCB778.1060104@redhat.com>
References: <4ADC582E.305@wpkg.org> <68676e00910190609t5dee17e9y9f26b63b7a077de3@mail.gmail.com> <4ADC6A25.5080503@wpkg.org>
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Cc: Luca Tettamanti <kronos.it@gmail.com>, kvm@vger.kernel.org,
	linux-pci@vger.kernel.org
To: Tomasz Chmielewski <mangoo@wpkg.org>
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> C 01 Mass storage controller
> 00 SCSI storage controller
> 01 IDE interface
> 02 Floppy disk controller
> 03 IPI bus controller
> 04 RAID bus controller
> 05 ATA controller
> 20 ADMA single stepping
> 30 ADMA continuous operation
> 06 SATA controller
> 00 Vendor specific
> 01 AHCI 1.0
> 07 Serial Attached SCSI controller
> 80 Mass storage controller

Virtio used to advertise itself as class 0x0180 aka "mass storage 
controller".  You can even switch the driver into that mode for backward 
compatibility reasons.  Problem with that is that you can't get windows 
driver certifications then ...

cheers,
   Gerd