[PATCH 0/3] x86/PCI: Clip only partial E820 overlaps

[Bjorn Helgaas]

From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>

This is based on Hans' extensive debugging and patch at
https://lore.kernel.org/r/20220228105259.230903-1-hdegoede@xxxxxxxxxx
and applies on 7e57714cd0ad ("Linux 5.17-rc6").

This is basically the same idea (applying the 4dc2287c1805 workaround only
when an E820 region *partially* overlaps a host bridge window), but I think
it's a little simpler.

This also adds a little dmesg output when clipping, which should make
future debugging easier.

I bcc'd several folks who didn't have public email addresses in the RedHat
bugzilla or Launchpad.  If you review or test this, I'd be happy to
acknowledge that.

Bjorn Helgaas (3):
  x86/PCI: Eliminate remove_e820_regions() common subexpressions
  x86/PCI: Log host bridge window clipping for E820 regions
  x86/PCI: Preserve host bridge windows completely covered by E820

 arch/x86/include/asm/e820/api.h |  5 +++++
 arch/x86/kernel/resource.c      | 34 ++++++++++++++++++++++++++-------
 arch/x86/pci/acpi.c             |  5 +++++
 3 files changed, 37 insertions(+), 7 deletions(-)

-- 
2.25.1