[Qemu-devel] kFreeBSD and USB support

[Qemu-devel] kFreeBSD and USB support

[Michael Tokarev]

Hello.

On debian we, for a long time, used the following hack
in a build script of qemu:

# Hack alert.  qemu-1.3 still needs this.
# On recent kFreebsd, old USB host API has been removed,
# but qemu did not learn to use new USB API.
# Just do not build USB host support.
        sed -i 's/^HOST_USB=bsd/HOST_USB=stub/' \
                qemu-build/config-host.mak

This isn't really FreeBSD but "kFreeBSD", which is
a FreeBSD kernel (and ofcorse the kernel headers)
and some more linux-like userspace - it is Debian
userspace running on top of FreeBSD kernel.

This effectively disables host usb support for
kFreeBSD.  And since I guess the kernel headers
are the same on regular FreeBSD, I think the same
issue happens on regular FreeBSD too, that is,
host usb does not work there as well.

What is the status of this situation now?

Thanks,

/mjt

Re: [Qemu-devel] kFreeBSD and USB support

[Andreas Färber]

Am 05.06.2013 22:17, schrieb Michael Tokarev:
> Hello.
> 
> On debian we, for a long time, used the following hack
> in a build script of qemu:
> 
> # Hack alert.  qemu-1.3 still needs this.
> # On recent kFreebsd, old USB host API has been removed,
> # but qemu did not learn to use new USB API.
> # Just do not build USB host support.
>         sed -i 's/^HOST_USB=bsd/HOST_USB=stub/' \
>                 qemu-build/config-host.mak
> 
> This isn't really FreeBSD but "kFreeBSD", which is
> a FreeBSD kernel (and ofcorse the kernel headers)
> and some more linux-like userspace - it is Debian
> userspace running on top of FreeBSD kernel.
> 
> This effectively disables host usb support for
> kFreeBSD.  And since I guess the kernel headers
> are the same on regular FreeBSD, I think the same
> issue happens on regular FreeBSD too, that is,
> host usb does not work there as well.
> 
> What is the status of this situation now?

I believe as of FreeBSD 9 their USB stack was rewritten and thus USB
host support disabled in FreeBSD ports, too.

Andreas

-- 
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg

Re: [Qemu-devel] kFreeBSD and USB support

[Ed Maste]

On 5 June 2013 16:17, Michael Tokarev <mjt@tls.msk.ru> wrote:
> Hello.
>
> On debian we, for a long time, used the following hack
> in a build script of qemu:
>
> # Hack alert.  qemu-1.3 still needs this.
> # On recent kFreebsd, old USB host API has been removed,
> # but qemu did not learn to use new USB API.
> # Just do not build USB host support.
>         sed -i 's/^HOST_USB=bsd/HOST_USB=stub/' \
>                 qemu-build/config-host.mak

In fact, the FreeBSD ports tree Makefile for QEMU does basically the
same thing -- search for 'HOST_USB' in
http://svnweb.freebsd.org/ports/head/emulators/qemu-devel/Makefile?revision=319450&view=co

> This isn't really FreeBSD but "kFreeBSD", which is
> a FreeBSD kernel (and ofcorse the kernel headers)
> and some more linux-like userspace - it is Debian
> userspace running on top of FreeBSD kernel.
>
> This effectively disables host usb support for
> kFreeBSD.  And since I guess the kernel headers
> are the same on regular FreeBSD, I think the same
> issue happens on regular FreeBSD too, that is,
> host usb does not work there as well.
>
> What is the status of this situation now?

On FreeBSD-current libusb has grown the functionality required by
QEMU's recent libusb USB host code, and I'm using that.  I assume that
the current BSD host USB code works on NetBSD and OpenBSD, but don't
really know; possibly they can switch to libusb as well.

Re: [Qemu-devel] kFreeBSD and USB support

[Brad Smith]

On 05/06/13 4:34 PM, Ed Maste wrote:
> On 5 June 2013 16:17, Michael Tokarev <mjt@tls.msk.ru> wrote:
>> Hello.
>>
>> On debian we, for a long time, used the following hack
>> in a build script of qemu:
>>
>> # Hack alert.  qemu-1.3 still needs this.
>> # On recent kFreebsd, old USB host API has been removed,
>> # but qemu did not learn to use new USB API.
>> # Just do not build USB host support.
>>          sed -i 's/^HOST_USB=bsd/HOST_USB=stub/' \
>>                  qemu-build/config-host.mak
>
> In fact, the FreeBSD ports tree Makefile for QEMU does basically the
> same thing -- search for 'HOST_USB' in
> http://svnweb.freebsd.org/ports/head/emulators/qemu-devel/Makefile?revision=319450&view=co
>
>> This isn't really FreeBSD but "kFreeBSD", which is
>> a FreeBSD kernel (and ofcorse the kernel headers)
>> and some more linux-like userspace - it is Debian
>> userspace running on top of FreeBSD kernel.
>>
>> This effectively disables host usb support for
>> kFreeBSD.  And since I guess the kernel headers
>> are the same on regular FreeBSD, I think the same
>> issue happens on regular FreeBSD too, that is,
>> host usb does not work there as well.
>>
>> What is the status of this situation now?
>
> On FreeBSD-current libusb has grown the functionality required by
> QEMU's recent libusb USB host code, and I'm using that.  I assume that
> the current BSD host USB code works on NetBSD and OpenBSD, but don't
> really know; possibly they can switch to libusb as well.

AFAIK the BSD USB backend is supposed to work on OpenBSD, though I have
never used that support myself never having used USB within an image
under QEMU. But when libusb 1.0.16 is released and into our ports tree
I'll look into enabling the libusb support. The libusb USB backend for 
OpenBSD is relatively well maintained and I'd trust that working 
properly over the code within QEMU.

-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

Re: [Qemu-devel] kFreeBSD and USB support

[Gerd Hoffmann]

  Hi,

> This effectively disables host usb support for
> kFreeBSD.  And since I guess the kernel headers
> are the same on regular FreeBSD, I think the same
> issue happens on regular FreeBSD too, that is,
> host usb does not work there as well.
> 
> What is the status of this situation now?

I have no idea how well the host-bsd code actually works.  I've used an
OpenBSD (virtual machine) for build tests.  Last time I tried it did not
build on FreeBSD.  No idea where NetBSD (or any other variant) stands.

My long-term plan for usb-host support is to build on libusbx
exclusively (merged in the 1.5 devel cycle), thereby offloading all
portability issues to libusbx.  Right now we are in a transition period,
the old code is still around so you can flip back and forward between
libusbx implementation and the os-specific bits for linux/bsd, mainly
because a pretty recent linusbx version is required and also to ease
regression testing.  At some point in the future I want get rid of the
old code though.

FreeBSD reportly has its own libusb implementation, with a library
interface compatible to libusbx.  That should work with kFreeBSD too.  I
don't know what the other BSD variants are doing, but due to libusbx
being used by alot of userspace usb apps/drivers I'd expect it is
present in some form usable for qemu's host-libusb code ...

cheers,
  Gerd

Re: [Qemu-devel] kFreeBSD and USB support

[Hans de Goede]

Hi,

On 06/06/2013 02:47 PM, Gerd Hoffmann wrote:
>    Hi,
>
>> This effectively disables host usb support for
>> kFreeBSD.  And since I guess the kernel headers
>> are the same on regular FreeBSD, I think the same
>> issue happens on regular FreeBSD too, that is,
>> host usb does not work there as well.
>>
>> What is the status of this situation now?
>
> I have no idea how well the host-bsd code actually works.  I've used an
> OpenBSD (virtual machine) for build tests.  Last time I tried it did not
> build on FreeBSD.  No idea where NetBSD (or any other variant) stands.
>
> My long-term plan for usb-host support is to build on libusbx
> exclusively (merged in the 1.5 devel cycle), thereby offloading all
> portability issues to libusbx.  Right now we are in a transition period,
> the old code is still around so you can flip back and forward between
> libusbx implementation and the os-specific bits for linux/bsd, mainly
> because a pretty recent linusbx version is required and also to ease
> regression testing.  At some point in the future I want get rid of the
> old code though.
>
> FreeBSD reportly has its own libusb implementation, with a library
> interface compatible to libusbx.  That should work with kFreeBSD too.  I
> don't know what the other BSD variants are doing, but due to libusbx
> being used by alot of userspace usb apps/drivers I'd expect it is
> present in some form usable for qemu's host-libusb code ...

Yes, on FreeBSD it is best to use FreeBSD's libusb replacement implementation
which is API compatible, this likely is also best used on Debian-kfreebsd
(as a replacement for the regular libusb).

Regular libusb currently has linux, macosx, openbsd, netbsd and win32
backends. With linux being the most feature complete, your mileage may vary
on other platforms, but all the basics are there, so if necessary people could
spend some time on fixing libusb's backend code for a platform they care about.

Regards,

Hans