Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus

[Avi Kivity]

On 08/27/2009 11:13 AM, Gerd Hoffmann wrote:
> On 08/27/09 09:57, Avi Kivity wrote:
> > > What is needed on the guest side? Looks like even 2.6.30 doesn't use
> > > MSI for virtio-net ...
> >
> > virtio msi support was merged in 2.6.31. For e1000, guest support is
> > presumably there, just need to wire it into the device.
>
> lspci shows MSI (not MSI-X) capability for the e1000 in my laptop.  It 
> is not enabled.  dmesg has this line though:
>
> 0000:02:00.0: 0000:02:00.0: Failed to initialize MSI interrupts. 
> Falling back to legacy interrupts.
>
> so the driver at least tried to enable MSI ...

You probably need chipset support.  I recommend drop that laptop and 
running exclusively in VMs.

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