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Re: [Qemu-devel] Problem with QEMU on KVM
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] Problem with QEMU on KVM |
Date: |
Mon, 12 Apr 2010 13:07:39 +0100 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Mulyadi Santosa wrote:
> Hi Gerhard...
>
> On Sun, Apr 11, 2010 at 20:52, Gerhard Wiesinger <address@hidden> wrote:
> > OK, uses the following ports:
> > Port 0x20: 8259 interrupt controller
> > Port 0x40: 8253 timer
> >
> > Interrupt 0x1A:
> > ah=0x00: fetches system timer counters
> > ah=0x02: reads the clock
> > ah=0x04: fetches date
> >
> > So there must be something wrong with KVM with the above functionality (I
> > guess the timers).
>
> Hmm, my silly guess is, maybe the timer is seen as decremented....or
> at least "stuck".
>
> I have very little knowledge about git, but maybe you can start doing
> git bisect to narrow which git commit that introduce such behaviour.
> Meanwhile, let's wait for comments from one of the KVM developers.
There are various -no-kvm-XXX options to try:
-no-kvm-irqchip disable KVM kernel mode PIC/IOAPIC/LAPIC
-no-kvm-pit disable KVM kernel mode PIT
-no-kvm-pit-reinjection disable KVM kernel mode PIT interrupt reinjection
Any of them might be causing this problem.
They disable in-kernel emulation of the interrupt controller and timer
chips, and force the qemu version to be used. It's possible the
in-kernel emulation is buggier than the qemu version.
-- Jamie
- [Qemu-devel] Problem with QEMU on KVM, Gerhard Wiesinger, 2010/04/10
- Re: [Qemu-devel] Problem with QEMU on KVM, Mulyadi Santosa, 2010/04/11
- Re: [Qemu-devel] Problem with QEMU on KVM, Gerhard Wiesinger, 2010/04/11
- Re: [Qemu-devel] Problem with QEMU on KVM, Mulyadi Santosa, 2010/04/12
- Re: [Qemu-devel] Problem with QEMU on KVM,
Jamie Lokier <=
- Re: [Qemu-devel] Problem with QEMU on KVM, Mulyadi Santosa, 2010/04/12
- [Qemu-devel] Re: Problem with QEMU on KVM, Jan Kiszka, 2010/04/13
- [Qemu-devel] Re: Problem with QEMU on KVM, Gerhard Wiesinger, 2010/04/19
- [Qemu-devel] Re: Problem with QEMU on KVM, Jan Kiszka, 2010/04/19
- Re: [Qemu-devel] Problem with QEMU on KVM, Gerhard Wiesinger, 2010/04/13
Re: [Qemu-devel] Problem with QEMU on KVM, Gerhard Wiesinger, 2010/04/19