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

From: Bjorn Helgaas <helgaas@kernel.org>
To: Hans de Goede <hdegoede@redhat.com>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
	Ingo Molnar <mingo@redhat.com>
Cc: "Mika Westerberg" <mika.westerberg@linux.intel.com>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Myron Stowe" <myron.stowe@redhat.com>,
	"Juha-Pekka Heikkila" <juhapekka.heikkila@gmail.com>,
	"Benoit Grégoire" <benoitg@coeus.ca>,
	"Hui Wang" <hui.wang@canonical.com>,
	"Kai-Heng Feng" <kai.heng.feng@canonical.com>,
	linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	"Bjorn Helgaas" <bhelgaas@google.com>
Subject: [PATCH 0/3] x86/PCI: Clip only partial E820 overlaps
Date: Thu,  3 Mar 2022 21:51:07 -0600	[thread overview]
Message-ID: <20220304035110.988712-1-helgaas@kernel.org> (raw)

From: Bjorn Helgaas <bhelgaas@google.com>

This is based on Hans' extensive debugging and patch at
https://lore.kernel.org/r/20220228105259.230903-1-hdegoede@redhat.com
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