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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 1 Aug 2017, Edgar E. Iglesias wrote:
> 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.

Fantastic!!


> So please ignore this patch for now :-)


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