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xen-devel
Re: [Xen-devel] AMD_IOV: IO_PAGE_FALT trying to pass through Mellanox Co
On Mon, Jan 31, 2011 at 02:51:54PM -0500, Ward Vandewege wrote:
> Hi Konrad,
>
> On Mon, Jan 31, 2011 at 01:45:03PM -0500, Konrad Rzeszutek Wilk wrote:
> > > Hmm, I do have it:
> >
> > Indeed you do. Good!
> >
> > >
> > > # xm dmesg |grep iommu
> > > (XEN) Command line: placeholder iommu=pv,verbose,amd_iommu_debug
> > >
> > > But maybe it's not being picked up?
> >
> > You should see something passthrough in the log.. thought that might
> > be only if you are using Intel VT-d? Not sure.
>
> This seems related:
>
> (XEN) HVM: ASIDs enabled.
> (XEN) HVM: SVM enabled
> (XEN) HVM: Hardware Assisted Paging detected.
> (XEN) AMD-Vi: IOMMU 0 Enabled.
> (XEN) I/O virtualisation enabled
> (XEN) - Dom0 mode: Relaxed
> (XEN) Total of 16 processors activated.
> (XEN) ENABLING IO-APIC IRQs
> (XEN) -> Using new ACK method
>
> I've attached the full xm dmesg output.
>
> > > > you might need to make sure your driver is using the VM_IO flag.
> > > >
> > > > There was some discussion on LKML about this and they proposed
> > > > a patch that wasn't neccessary. Don't remember the details but I can
> > > > look that up next week.
> >
> > Found it.. it was from Vivien but in another thread:
> > http://www.mail-archive.com/linux-rdma@xxxxxxxxxxxxxxx/msg06980.html
>
> Ah. Is your
>
> devel/p2m-identity.v4.5
>
> still the one I should test with to see if it fixes this problem? I see
> you've got newer versions (up to v4.7) now too.
It has a bug that I am working on. I would just look for the VM_IO flag
and see if it has been applied somewhere. Or vice-versa - look for where
it has _not_ been applied.
>
> Or has this patch meanwhile been pushed into the kernel?
Not yet.
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