Re: [PATCH 2/2] PCI: vmd: Fix shadow offsets to reflect spec changes

[Lorenzo Pieralisi]

On Tue, Sep 17, 2019 at 03:51:39PM +0000, Derrick, Jonathan wrote:

[...]

> Sorry for the confusion.
> 
> These changes only affect systems with VMD devices with 8086:28C0
> device IDs, but these won't be production hardware for some time.
> 
> Systems with VMD devices exist in the wild with 8086:201D device IDs.
> These don't support the guest passthrough mode and this code won't
> break anything with them. Additionally, patch 1/2 (bus numbering) only
> affects 8086:28C0.
> 
> So on existing HW, these patches won't affect anything

It is me who created confusion, apologies. I read the code properly and
I understand that both patches are fixes for HW that is still not
available (and they can't create an issue with current kernel because
HAS_MEMBAR_SHADOW and HAS_BUS_RESTRICTIONS features are not implemented
on 8086:201D), we should take these patches and trickle them to stable
kernels as soon as possible so that when HW _is_ available mainline and
stable kernels are fixed.

Correct ?

Lorenzo