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Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus
From: |
Gleb Natapov |
Subject: |
Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus |
Date: |
Thu, 27 Aug 2009 11:24:37 +0300 |
On Thu, Aug 27, 2009 at 09:18:32AM +0100, Jamie Lokier wrote:
> Gleb Natapov wrote:
> > On Thu, Aug 27, 2009 at 09:40:06AM +0200, Gerd Hoffmann wrote:
> > > Or does it mean we must emulate a more recent chipset?
> > >
> > That too will work.
>
>
> Note that if you change the chipset, it'll break some existing Windows VMs.
>
I don't think it worth changing chipset just to solve irq routing
problem. And PIIX4 is the same as PIIX3 in regards to pci irq routing.
> I had this problem when porting a Windows Server 2003 VM from Virtual
> PC to QEMU: Virtual PC emulates a PIIX4, while QEMU provides a PIIX3
> (even though there's a PIIX4 in the source code, it's not used for PC
> emulation). The ported image would not boot because of the change of
> chipset, until I patched the registry to accomodate the change.
>
> It will be the same the other way: When some Windows VMs see a change
> from PIIX3 to a later chipset, they will not boot.
>
> Some Windows VMs don't care as much. XP seems to be more like Linux,
> in that it adapts to different devices at boot time.
>
> -- Jamie
>
>
>
>
> >
> > --
> > Gleb.
> >
> >
--
Gleb.
- [Qemu-devel] [PATCH 0/2] Disentagle ISA IRQs, Avi Kivity, 2009/08/09
- [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/09
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/10
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/26
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/26
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/26
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gleb Natapov, 2009/08/26
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gleb Natapov, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Jamie Lokier, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus,
Gleb Natapov <=
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Isaku Yamahata, 2009/08/27
- [Qemu-devel] Re: [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Bjørn Mork, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Beth Kon, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/29