On Fri, 6 Jan 2017 11:22:33 +0000 Zir Blazer <zir_bla...@hotmail.com> wrote:
> As everyone knows by now, the Skylake refresh, Kaby Lake, was released a few > days ago as the new 7th gen Core Processors. This includes the Union Point > Chipsets (200 Series) for LGA 1151, which are the B250, Q250, Q270, H270, > Z270, and possibily at least one more Chipset for Xeons E3 1200v6, which is > rumored to be the C422 according to available info (It was not officially > released as far that I know, nor the Xeons E3 1200v6). > > > If I recall correctly, when the Skylake platform was first released, there > was something broken in the Sunrise Point Chipsets related to PCIe ACS > support, thus the IOMMU Grouping of the Chipset integrated Devices and its > PCIe Slots was extremely ugly. A quirk for that was included in the Linux > Kernel, and everyone was happy. But with the new Chipsets, it seems that we > will need new quirks... > > > According to the 200 Series Chipset Family PCH Spec Update, here: > > <http://www.intel.com/content/www/us/en/chipsets/200-series-chipset-pch-datasheet-vol-1.html>http://www.intel.com/content/www/us/en/chipsets/200-series-chipset-pch-spec-update.html > > > They have the Errata 22, which is that PCIe ACS is at a different offset than > expected. This looks to be the very same Errata 23 than the previous Skylake > Sunrise Point Chipsets had, which I suppose that is what got fixed last time: > > http://www.intel.la/content/www/xl/es/chipsets/100-series-chipset-spec-update.html > > > Basically, the new Motherboards with Union Point Chipsets should have broken > IOMMU Grouping in the same fashion as Sunrise Point, but should be fixeable. > > > So, I'm sending this to be one step ahead of the Kaby Lake early adopters > that will for sure eventually report this :D Thanks for this, and especially for finding the errata that indicates Union Point has the same bug, that's critical for supporting a patch. I've just posted this: https://lkml.org/lkml/2017/1/19/458 Hopefully it'll be fixed starting in the v4.11 kernel. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
