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From: Elliott Mitchell <ehem+xen@m5p.com>
To: Masami Hiramatsu <masami.hiramatsu@linaro.org>
Cc: Julien Grall <julien@xen.org>,
	xen-devel@lists.xenproject.org,
	Alex Benn??e <alex.bennee@linaro.org>,
	bertrand.marquis@arm.com, andre.przywara@arm.com,
	Julien Grall <jgrall@amazon.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	George Dunlap <george.dunlap@citrix.com>,
	Ian Jackson <iwj@xenproject.org>, Jan Beulich <jbeulich@suse.com>,
	Wei Liu <wl@xen.org>, Roger Pau Monn?? <roger.pau@citrix.com>
Subject: Xen-ARM EFI/ACPI problems (was: Re: [PATCH 0/4] xen/arm: Unbreak ACPI)
Date: Fri, 16 Oct 2020 15:33:23 -0700
Message-ID: <20201016223323.GA23508@mattapan.m5p.com> (raw)
In-Reply-To: <CAA93ih2EiyCnuL4sw1OLw+XEWa7sN3zJWvsnxHfx9b9Fq+cOxw@mail.gmail.com>

On Mon, Sep 28, 2020 at 10:00:35PM +0900, Masami Hiramatsu wrote:
> I've missed the explanation of the attached patch. This prototype
> patch was also needed for booting up the Xen on my box (for the system
> which has no SPCR).

I'm pretty sure of this on the hardware I'm dealing with, but don't know
about the hardware you're dealing with.

Does your device have a framebuffer?  Have you ever tried/succeeded
booting your device with the framebuffer disabled? (booted with a
HDMI/DVI cable disconnected or the device on the other end *completely*
powered down)

Based upon the back and forth both on xen-devel and some messages which
were split off due to not being general.  An observation I had made a
while ago finally caused me to try recreating it.

On the device I'm on (Raspberry PI 4B with Tianocore -> GRUB -> Xen) I
discovered a SPCR table shows up if I boot with the device the output is
plugged into is powered down.  I'm guessing this causes Tianocore to
advise GRUB/Linux/Xen to boot with a serial console (presenting a Serial
Port Console Redirect table), whereas if the display device is
functioning the absense of SPCR is supposed to indicate console on
framebuffer.

This means the ACPI_FAILURE case in acpi_iomem_deny_access() simply needs
to be filled in similar to how it likely is on x86.  Allocate a serial
port for Xen's use as console, present it to domain 0 as hvc0, and hide
it from domain 0.



Next issue for me will be getting the framebuffer operational.
Apparently the Xen-ARM EFI implementation doesn't provide any EFI
variables to domain 0?  Jan Beulich, your name was mentioned as person
likely to have ideas for getting Linux's efifb code operational Xen-ARM.


-- 
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  \_CS\   |  _____  -O #include <stddisclaimer.h> O-   _____  |   /  _/
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  reply index

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-26 20:55 [PATCH 0/4] xen/arm: Unbreak ACPI Julien Grall
2020-09-26 20:55 ` [PATCH 1/4] xen/acpi: Rework acpi_os_map_memory() and acpi_os_unmap_memory() Julien Grall
2020-09-28  8:18   ` Jan Beulich
2020-09-28  9:58     ` Julien Grall
2020-09-28 10:09       ` Jan Beulich
2020-09-28 10:39         ` Julien Grall
2020-10-10  9:49           ` Julien Grall
2020-10-10 10:04             ` Julien Grall
2020-09-29 11:10   ` Rahul Singh
2020-10-01  0:06   ` Stefano Stabellini
2020-10-01 15:09     ` Julien Grall
2020-09-26 20:55 ` [PATCH 2/4] xen/arm: acpi: The fixmap area should always be cleared during failure/unmap Julien Grall
2020-09-29 11:13   ` Rahul Singh
2020-10-01  0:30   ` Stefano Stabellini
2020-10-01 15:14     ` Julien Grall
2020-09-26 20:55 ` [PATCH 3/4] xen/arm: Check if the platform is not using ACPI before initializing Dom0less Julien Grall
2020-09-29 11:17   ` Rahul Singh
2020-09-30 23:26   ` Stefano Stabellini
2020-09-26 20:55 ` [PATCH 4/4] xen/arm: Introduce fw_unreserved_regions() and use it Julien Grall
2020-09-30 23:40   ` Stefano Stabellini
2020-10-01 15:34     ` Julien Grall
2020-09-27  1:47 ` [PATCH 0/4] xen/arm: Unbreak ACPI Elliott Mitchell
2020-09-29 15:28   ` Elliott Mitchell
2020-09-28  6:47 ` Masami Hiramatsu
2020-09-28 13:00   ` Masami Hiramatsu
2020-10-16 22:33     ` Elliott Mitchell [this message]
2020-10-17  5:12       ` Xen-ARM EFI/ACPI problems (was: Re: [PATCH 0/4] xen/arm: Unbreak ACPI) Elliott Mitchell
2020-10-08 18:39   ` [PATCH 0/4] xen/arm: Unbreak ACPI Elliott Mitchell
2020-10-09  9:39     ` Julien Grall
2020-10-09 14:22       ` Elliott Mitchell
2020-10-09 18:15         ` Julien Grall
2020-10-09 22:36           ` Elliott Mitchell
2020-10-09 21:49   ` Elliott Mitchell
2020-10-10 11:02   ` Julien Grall
2020-10-12 19:02     ` Stefano Stabellini
2020-10-12 21:34       ` Elliott Mitchell
2020-10-14  1:06         ` Stefano Stabellini
2020-10-14  1:37           ` Elliott Mitchell
2020-10-14 17:47             ` Julien Grall
2020-10-15 18:00               ` Stefano Stabellini
2020-10-14 17:44       ` Julien Grall
2020-09-29 11:10 ` Rahul Singh
2020-09-29 15:29 ` Alex Bennée
2020-09-29 17:07   ` Julien Grall
2020-09-29 21:11     ` Alex Bennée
2020-09-29 23:39       ` André Przywara
2020-09-30  8:51         ` Alex Bennée
2020-09-30 10:35         ` Julien Grall
2020-09-30  9:42       ` Julien Grall
2020-09-30 10:38         ` Alex Bennée
2020-09-30 11:10           ` Julien Grall

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