Hi, On 6/10/22 00:43, Bjorn Helgaas wrote: > New regression in v5.19-rc1. > > ----- Forwarded message from bugzilla-daemon@xxxxxxxxxx ----- > > Subject: [Bug 216109] New: Steam Deck fails to boot when E820 entries clipped > out of _CRS > > https://bugzilla.kernel.org/show_bug.cgi?id=216109 > > Summary: Steam Deck fails to boot when E820 entries clipped out > of _CRS > Kernel Version: v5.19 > > Guilherme G. Piccoli reported that v5.18 boots fine on Steam Deck, but > v5.19-rc1 does not. He bisected it to 4c5e242d3e93 ("x86/PCI: Clip only host > bridge windows for E820 regions") [1]. > > A quirk similar to [2] that disables E820 clipping makes v5.19-rc1 work again. > > The reason why v5.18 (which always does E820 clipping by default) works, while > v5.19-rc1 (which also does E820 clipping on this platform) does not has not > been explained yet. > > [1] https://git.kernel.org/linus/4c5e242d3e93 > [2] https://git.kernel.org/linus/d341838d776a > > ----- End forwarded message ----- I've added some analysis of the logs to the bug. Summary: I think we may need to revert 4c5e242d3e93, this will be a non trivial revert moving the pci_use_e820 check added in later commits to arch_remove_reservations(). See the bug for details and lets discuss this further in the bug. In case we do eventually decide to go with a revert, I'll prepare a revert later today and push it to: https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans Note I do NOT plan to merge this through the pdx86 tree, the reason to put it there is to get the builders to play with it, since in the past: https://lore.kernel.org/linux-pci/20211014183943.27717-2-hdegoede@xxxxxxxxxx/ we had some build issues with the check inside arch_remove_reservations(). Regards, Hans
