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

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Message-Id: <20220304035110.988712-1-helgaas@kernel.org>
Date:   Thu,  3 Mar 2022 21:51:07 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Myron Stowe <myron.stowe@...hat.com>,
        Juha-Pekka Heikkila <juhapekka.heikkila@...il.com>,
        Benoit Grégoire <benoitg@...us.ca>,
        Hui Wang <hui.wang@...onical.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 0/3] x86/PCI: Clip only partial E820 overlaps

From: Bjorn Helgaas <bhelgaas@...gle.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