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

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2012-02-01 15:02, Erik Rull wrote:
> 
> 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.

MSI performance is expected to be worse with upstream as well, thus virtio.

>>
>>> 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.

What does qemu-kvm with -no-kvm-irqchip do?

Jan

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