On Fri, Oct 08, 2021 at 05:56:40AM -0500, Bjorn Helgaas wrote: > On Fri, Oct 08, 2021 at 11:45:38AM +0200, Borislav Petkov wrote: > > On Fri, Oct 08, 2021 at 12:23:31PM +0300, Mika Westerberg wrote: > > > On Fri, Oct 08, 2021 at 10:55:49AM +0200, Werner Sembach wrote: > > > > Is there any update on this matter? Also happens on discrete Thunderbolt 4 chips: > > > > https://bugzilla.kernel.org/show_bug.cgi?id=214259 > > > > > > AFAICT no updates. > > > > > > @Bjorn, x86 maintainers, > > > > > > If there are no alternatives can we get this patch merged so that people > > > don't need to carry out-of-tree patches to get their systems working? > > > > Just my 2¢ from briefly skimming over this: > > > > So this reads yet again as BIOS is to blame but what else is new? > > > > "All in all, I think we can fix this by modifying > > arch_remove_reservations() to check the EFI type as well and if it is > > EFI_MEMORY_MAPPED_IO skip the clipping in that case." > > > > And this like we should trust EFI to mark those regions properly, which > > is more of the same but in different color. > > > > That original commit talks about windoze doing a different allocation > > scheme and thus not trusting the untrustworthy firmware anyway and that > > sounds like something we should do too. But WTH do I know?! > > There are a couple other threads reporting similar issues: Bug reports from these threads: > https://lore.kernel.org/r/20210624095324.34906-1-hui.wang@xxxxxxxxxxxxx http://bugs.launchpad.net/bugs/1931715 http://bugs.launchpad.net/bugs/1932069 http://bugs.launchpad.net/bugs/1921649 > https://lore.kernel.org/r/20211005150956.303707-1-hdegoede@xxxxxxxxxx https://bugzilla.redhat.com/show_bug.cgi?id=1868899 https://bugzilla.redhat.com/show_bug.cgi?id=1871793 https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe/+bug/1878279 Most of these bug reports mention "pci=nocrs" as being a workaround. Obviously not a solution, but may be a way to limp along in the meantime.
