Re: PCI passthrough = NMIs

[Amit Shah <amit.shah@redhat.com>]

* On Tuesday 14 Oct 2008 22:46:37 Zwane Mwaikambo wrote:
> On Tue, 14 Oct 2008, Han, Weidong wrote:
> > Zwane Mwaikambo wrote:
> > > Hi,
> > > 	I've been trying to get a Linux guest working with PCI
> >
> > passthrough
> >
> > > of an ethernet card using the vtd branches. The device detection
> > > works and the guest reports a link, however as soon as i try and ping
> > > the guest it receives an NMI (i'm guessing this is PCI DMA related).
> > > Interrupt delivery to the guest looks fine (count increases at a low
> > > rate) and isn't shared with anything else on the host.
> > >
> > > Thanks for any hints.
> > >
> > > 	Zwane
> >
> > What do you mean "vtd branches"? Is it the vtd branch of Amit's tree?
> >
> > VT-d patches are in kvm.git, as long as you apply amit's userspace patch
> > (you can find it on mailing list), you should can assign device to
> > guest. Make sure you enable VT-d in BIOS and set CONFIG_DMAR in config,
> > and remove device driver before you assign device. NIC and USB
> > controller assignment works fine for me.
>
> I'm using the following repositories without any additional patches;
>
> git://git.kernel.org/pub/scm/linux/kernel/git/amit/kvm.git vtd
> git://git.kernel.org/pub/scm/linux/kernel/git/amit/kvm-userspace.git vtd

Can you try using Avi's kvm.git tree and the userspace tree same as above 
(it's been updated now and you'll have to use +vtd as the branch)?

That's the newest code; though I'm not sure if it will solve your problem.

> The host kernel only has the e100 network driver enabled, the guest kernel
> only has the e1000 network driver enabled. I have enabled VT-d in the BIOS
> and enabled CONFIG_DMAR in the host kernel config. I'm really beginning to
> suspect the BIOS unfortunately :(

Amiit.