[Bug 97621] [SKL] System boots with [drm:i915_stolen_to_physical] *ERROR* conflict detected with stolen region: [0xc6000000 - 0xc8000000] on dmesg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97621

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
So the new BIOS adds a conflicting entry:

[    0.000000] BIOS-e820: [mem 0x00000000c5300000-0x00000000c7ffffff] reserved

with which the kernel manages to zap our

[    0.000000] Reserving Intel graphics memory at
0x00000000c6000000-0x00000000c7ffffff

However. In the old BIOS,

[    0.000000] Reserving Intel graphics memory at
0x00000000c1000000-0x00000000c2ffffff

which was not marked up as reserved inside the e820.

It seems to be e820_reserve_resources_late() is causing the conflict, but our
earlier intel_graphics_stolen() should ideally have fixed up the e820 map.

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