Re: [Qemu-devel] git bisect results: ec757c67c40a56492001487e69272f62144fd124 breaks windows boot in qemu-kvm

[Erik Rull <erik.rull@rdsoftware.de>]

On February 1, 2012 at 2:40 PM Avi Kivity <avi@redhat.com> wrote:

> On 02/01/2012 02:52 PM, Erik Rull wrote:
> >  Hi all,
> >
> > first of all I'm a bit confused:
> >
> > What is the difference between qemu with command line option
--enable-kvm
> > and qemu-kvm?
> > It seems to be a difference in code so far, from the performance point
of
> > view it seems to be the same...
>
> The differences are being reduced rapidly, thanks to Jan's efforts.
> Right now what remains is PIT performance and accuracy, device
> assignment, and Windows XP performance.  Most guests should see the same
> performance.
>
> > Now my issue that lead me to a git bisect on qemu-kvm:
> > The following commit / merge breaks my windows guest boot sequence and
> > causes resets infinitely:
> > ec757c67c40a56492001487e69272f62144fd124 Merge branch 'upstream-merge'
into
> > next
> > Thu, 5 Jan 2012 11:00:07 +0000 (13:00 +0200)    Avi Kivity
<avi@redhat.com>
> >
> >
> > Interesting: qemu with --enable-kvm master and the same command line
> > options as qemu-kvm runs perfect.
> > My command line options are:
> > qemu-system-x86_64 -serial /dev/ttyS2 -readconfig
/etc/ich9-ehci-uhci.cfg
> > -device usb-host,bus=ehci.0 -device usb-tablet -drive
> > file=/dev/sda2,cache=off -m 1024 -net nic,macaddr=$MACADDR -net
> > tap,script=/etc/qemu-ifup -no-acpi -monitor stdio -L
/usr/X11R6/share/qemu
> > -boot c -localtime
> >
> >
>
> What version of Windows are you using?  What's the contents of
> /etc/ich9-ehci-uhci.cfg?
>

Hi Avi,

the contents from the .cfg are located in docs/ich9-ehci-uhci.cfg

I tried two versions of Windows XP: One is the default Windows XP SP3 that
you get from MSDN, one is Windows Embedded Standard (embedded customized
XP).

Both show the same behavior: boots with qemu -enable-kvm and continuously
reboots with qemu-kvm.

Best regards,

Erik