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Date: Tue, 21 Nov 2023 16:24:07 +0100
From: Tomasz Pala <gotar@polanet.pl>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: linux-pci@vger.kernel.org, Dan J Williams <dan.j.williams@intel.com>,
	Kan Liang <kan.liang@linux.intel.com>,
	Tony Luck <tony.luck@intel.com>,
	David E Box <david.e.box@intel.com>,
	Yunying Sun <yunying.sun@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
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	Florent DELAHAYE <linuxkernelml@undead.fr>,
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	Bjorn Helgaas <bhelgaas@google.com>,
	Sebastian Manciulea <manciuleas@protonmail.com>
Subject: Re: [PATCH 2/2] x86/pci: Treat EfiMemoryMappedIO as reservation of
 ECAM space
Message-ID: <20231121152407.GA13288@polanet.pl>
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 <20231120162933.GA197390@bhelgaas>
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User-Agent: Mutt/1.5.20 (2009-06-14)

On Mon, Nov 20, 2023 at 10:29:33 -0600, Bjorn Helgaas wrote:

> Thank you!  A BIOS update is almost never the answer because even if
> an update exists, we have to assume that most users in the field will
> never install the update.

Not to mention enabling 64-bit BARs, which is even more cumbersome
ixgbe-specific magic that requires entirely dedicated tools...

>> .text .data .bss are not marked as E820_TYPE_RAM!
and
>> DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x00000000df243000-0x00000000df251fff], contact BIOS vendor for fixes
>> DMAR: [Firmware Bug]: Your BIOS is broken; bad RMRR [0x00000000df243000-0x00000000df251fff]
[...]
> I think Linux basically converts the info from EFI GetMemoryMap
> to an e820 format; I think booting with "efi=debug" would show more
> details of this.

The dmesg I've attached today is with efi=debug, but the weird thing is
- both of the above warnings manifested themself only once, with the
first (verbose debugging: "MCFG debug") patch applied... Anyway.

The "memremap attempted on mixed range 0x0000000000000000 size: 0x8000
WARNING: CPU: 0 PID: 1 at kernel/iomem.c:78 memremap+0x154/0x170" also
seems to be triggered by "efi=debug", so my guess is that it's unrelated.

-- 
Tomasz Pala <gotar@pld-linux.org>