linux-kernel - Re: [PATCH 3/3] x86/PCI: Preserve host bridge windows completely covered by E820

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Message-ID: <20220304183451.GA1046413@bhelgaas>
Date:   Fri, 4 Mar 2022 12:34:51 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        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>, wse@...edocomputers.com
Subject: Re: [PATCH 3/3] x86/PCI: Preserve host bridge windows completely
 covered by E820

On Fri, Mar 04, 2022 at 04:46:11PM +0100, Hans de Goede wrote:
> On 3/4/22 16:32, Bjorn Helgaas wrote:

> > I think what might add useful information would be to always log the
> > EFI "RUN" entries.  IIUC, currently the "efi: mem47: ..." lines are
> > only emitted when booting with "efi=debug"?
> > 
> > I think the "RUN" lines indicate regions that must be virtually mapped
> > so EFI runtime services can use them, and it seems like it might be
> > more generally useful to always mention them.
> 
> I'm not sure about always logging the EFI memmap I agree it might
> be useful sometimes, but it is easy to enable then and the initial
> boot code of the kernel already is pretty "chatty".

Yeah.  I didn't mean all of the EFI memmap, just the parts that we're
sharing with firmware.  But I guess everybody probably has different
parts of the map they think would be interesting :)