Re: [Qemu-devel] State of EHCI emulation for QEMU

[Jan Kiszka]

Am 08.12.2010 09:18, Gerd Hoffmann wrote:
>   Hi,
> 
>> - command line must look like this:
>>          ...
>>          -drive if=none,id=usbstick,file=/path/to/image   \
>>          -device usb-storage,bus=ehci.0,drive=usbstick
>>    ie. register driver device referencing it, and there was a typo id->if
> 
> I'll fix.
> 
>> - long-term, "-usb" should become a shorthand for "-device
>>    usb-uhci,id=uhci -device usb-ehci,id=ehci" (at least for x86)
> 
> Hmm, I'd tend to leave '-M pc' as-is and enable ehci by default in the
> upcoming q35 emulation, especially in case both make it into 0.15.

I'm was concerned about the semantic of -usb. If ehci&uhci is going to
be on by default in the future, we should obsolete and finally drop this
switch.

> 
>> Unfortunately, msd is not yet magically healed:
>>
>>    non queue head request in async schedule
>>    processing error - resetting ehci HC
> 
> Yea, I've seen a flaw in async handling.  Just need to dig some more
> into the code to fix it properly, also the packet workflow (including
> async handling) is one of the spots where the qemu usb subsystem needs
> some work ...
> 
>> PS: Your tree lacks conversion of usb-musb.c.
> 
> Huh?  'git diff kiszka/master kiszka/ehci hw/usb-musb.c' is empty.

The breakage comes from one of your patches. Just try to build an ARM
target.

Jan

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