linux-kernel - Re: [PATCH] x86/PCI: Add pci=no_e820 cmdline option to ignore E820 reservations for bridge windows

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Date:   Fri, 8 Oct 2021 06:01:49 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, linux-pci@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Hui Wang <hui.wang@...onical.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Myron Stowe <myron.stowe@...hat.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Benoit Grégoire <benoitg@...us.ca>,
        Juha-Pekka Heikkila <juhapekka.heikkila@...il.com>
Subject: Re: [PATCH] x86/PCI: Add pci=no_e820 cmdline option to ignore E820
 reservations for bridge windows

[+cc Mika, Benoit, Juha-Pekka]

On Thu, Oct 07, 2021 at 11:55:32AM -0500, Bjorn Helgaas wrote:
> [+cc Hui, Rafael, Myron; this looks like the same issue Hui encountered:
> https://lore.kernel.org/r/20210624095324.34906-1-hui.wang@canonical.com]

Cross reference to another thread about a similar issue:

  https://lore.kernel.org/r/20200617164734.84845-1-mika.westerberg@linux.intel.com

Beginning of this thread:

  https://lore.kernel.org/r/20211005150956.303707-1-hdegoede@redhat.com

> On Tue, Oct 05, 2021 at 05:09:56PM +0200, Hans de Goede wrote:
> > Some BIOS-es contain a bug where they add addresses which map to system RAM
> > in the PCI bridge memory window returned by the ACPI _CRS method, see
> > commit 4dc2287c1805 ("x86: avoid E820 regions when allocating address
> > space").
> > ...