On Tue, 2019-09-17 at 17:37 +0100, Lorenzo Pieralisi wrote: > 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 That's correct. It will apply to 5.2 stable but is missing a few deps for 4.19 that I wouldn't consider as qualifying as stable. I can backport to 4.19 fairly easily. Thanks, Jon
