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Re: USB pass through into Mac OS 9.x with qemu-system-ppc

From: Howard Spoelstra
Subject: Re: USB pass through into Mac OS 9.x with qemu-system-ppc
Date: Fri, 12 Feb 2021 09:53:14 +0100

On Tue, Feb 9, 2021 at 6:17 PM Howard Spoelstra <hsp.cat7@gmail.com> wrote:
> On Tue, Feb 9, 2021 at 4:12 PM Gerd Hoffmann <kraxel@redhat.com> wrote:
>>   Hi,
>> > A noticeable issue when comparing the pcap files seems to be at Fedora pcap
>> > frame 8 and Mac OS 9.2 pcap frame 28 (configuration descriptor). It seems
>> > the Mac OS side is missing 5 bytes and hence the packet is malformed.
>> > (A run with Mac OS 9.0 as guest showed that this guest only missed 1 byte
>> > in the response.)
>> That is normal.  Note that the configuration descriptor is requested
>> twice:  Once with a buffer large enough to see the wTotalLength field.
>> and then again with a buffer large enough for the whole descriptor.
>> > Also visible in the Mac OS pcap file at frame 53 is that it seems a setup
>> > package is contained in an URB that is not suited for it.
>> Looks more like a bug in the qemu pcap code, probably have to set some
>> flag to indicate the setup section doesn't contain valid data instead
>> of just leaving it all blank.
>> Frame 55 is probably the problematic one.  Look at the timestamps.  The
>> device seems to not answer, then after a while macos seems to try reset
>> the device.
>> Also the fedora trace has the bulk transfer data so wireshark can decode
>> usb-storage commands and the scsi command wrapped inside.  That is not
>> the case in the macos trace.  Not sure whenever that is another bug in
>> the pcap code.  It could also indicate the bug in the ohci emulation
>> which in turn causes macos fail ...
>> > Qemu-system-ppc is started like this for the Mac OS guest:
>> > ./qemu-system-ppc \
>> > -M mac99,via=pmu \
>> > -m 512 \
>> > -boot c \
>> > -serial stdio \
>> > -L pc-bios \
>> > -drive file=/home/hsp/Mac-disks/9.2.img,format=raw,media=disk \
>> > -device usb-host,vendorid=0x058f,productid=0x6387,pcap=macos92.pcap
>> Does an emulated usb stick work with macos?
> Hi Gerd,
> Thanks for getting back to me.
> Yes, usb-storage works just fine with
> -drive if=none,id=stick,file=/home/hsp/Mac-disks/9.0.img,format=raw \
> -device usb-storage,drive=stick
> Best,
> Howard

Hi Gerd,

Please find another pcap file attached. This one stems from an attempt
to pass through a midi device when running qemu-system-ppc with Mac OS
9.2 in macOS host.
In case you'd like to run a MacOS 9.2 guest yourself, I've prepared a
zipped disk image to do just that:


Attachment: usblog.pcap
Description: Binary data

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