[Qemu-devel] kqemu freebsd host smp problems?
Juergen Lock
qemu-l at jelal.kn-bremen.de
Sat Jul 16 20:23:24 GMT 2005
On Sun, Jul 10, 2005 at 01:39:47PM +0900, Norikatsu Shigemura wrote:
> On Sun, 03 Jul 2005 17:37:42 -0700
> Bakul Shah <bakul at BitBlocks.com> wrote:
> > Lock writes:
> > > Is kqemu and the freebsd wrapper smp aware? I just saw this panic
> > > report again,
> > > http://lists.freebsd.org/pipermail/freebsd-current/2005-May/050161.html
> > > and noticed it apparently happened with an smp kernel.
> > My guess is
> > .d_flags = D_NEEDGIANT,
> > needs to be added to the initializer of kqemu_cdevsw for the
> > freebsd-current case. AFAIK this flag ensures only one
> > thread can be in this driver at a time (but caveat emptor: I
> > don't play in the kernel these days).
>
> I confirmed that qemu on latest FreeBSD 6-current got more
> stability!!, but more little slowly:-( and a panic:-( too.
>
>
> Now I'm testing improved qemu port:
> http://tmp.ninth-nine.com/qemu/qemu.20050708-2.port.tar.bz2
>
> 1. Merge /dev/kqemu cloning support to kmod_bsd.c.
> Obtained from: http://lists.gnu.org/archive/html/qemu-devel/2005-06/msg00135.html
> Submitted by: Craig Boston <craig at xfoil.gank.org>
>
> > $ fstat /dev/kqemu*
> > USER CMD PID FD MOUNT INUM MODE SZ|DV R/W NAME
> > nork qemu 33805 5 /dev 168 crw-rw---- #C:0:0x0 rw /dev/kqemu1
> > root qemu 20779 6 /dev 152 crw-rw---- #C:0:0x0 rw /dev/kqemu0
> In this time, I'm installing Windows XP SP2 and FreeBSD 5.4-R.
>
> 2. Giant-lock kqemu.ko.
> Obtained from: http://lists.gnu.org/archive/html/qemu-devel/2005-07/msg00070.html
> Suggested by: Bakul Shah <bakul at BitBlocks.com>
>
> 3. Add experimental IDE WDMA support.
> Obtained from: I forgot:-(
Juergen Keil, iirc
> Submitted by(AFAIK): Juergen Lock <qemu-l at jelal.kn-bremen.de>
But as i said this patch has problems with FreeBSD guests with
atapicam in the kernel, for example FreeSBIE 1.1 misdetects
cd0 as da0 and panics with a zero divide fault.
>
> 4. Utilize BSDMakefile to compile kqemu.ko, and cosmetic change.
>
Yeah you could do that...
>
> I contacted a panic. Please check following message.
>...
Well, I'll leave that to the kernel hackers :)
Juergen
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