Re: [Xen-devel] [PATCH v1 0/1] xen/arm: zynqmp: Disable PCIe

["Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxxx>]

On Mon, Jul 31, 2017 at 11:11:39PM +0100, Julien Grall wrote:
> 
> 
> On 31/07/2017 20:37, Edgar E. Iglesias wrote:
> >From: "Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxxx>
> >
> >Hi,
> 
> Hi Edgar,
> 
> 
> >We're seeing panics in dom0 with PCIe enabled due to what seems
> >to be wrongly created mappings by Xen. With older kernels we
> >didn't see the panics but PCIe wasn't functional in dom0.
> >
> >This disables the PCIe nodes on the ZynqMP until Xen/ARM gets
> >more PCIe support.
> 
> I feel a bit sad to ack a patch disabling PCIe in the ZynqMP.
> 
> Before doing that. Can you describe what is the exact problem with Xen? It
> might be possible that we don't parse correctly the device-tree.

Yes, it was related to the DTB since we had a workaround with a modified
DTB.

Anyway, I was to quick with sending out the patch.

We've been carrying this for a while and your questions prompted me
to have a look again and dig out the details. Turns out I can't reproduce it
with our latest kernel and the latest Xen. I don't know what fixed
it yet but PCIe works ATM both on QEMU models and on real HW.

I don't think it ever has before without modified DTBs.

So please ignore this patch for now :-)

Cheers,
Edgar


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