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

[Bjorn Helgaas]

[+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@xxxxxxxxxxxxx]

Cross reference to another thread about a similar issue:

  https://lore.kernel.org/r/20200617164734.84845-1-mika.westerberg@xxxxxxxxxxxxxxx

Beginning of this thread:

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

> 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").
> > ...