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From: Julien Grall <julien@xen.org>
To: Elliott Mitchell <ehem+xen@m5p.com>,
	Stefano Stabellini <sstabellini@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu@linaro.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>,
	Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Subject: Re: [PATCH 0/4] xen/arm: Unbreak ACPI
Date: Wed, 14 Oct 2020 18:47:50 +0100
Message-ID: <1b5f19f6-ea70-9e58-bf36-de7f7d54153a@xen.org> (raw)
In-Reply-To: <20201014013706.GA98635@mattapan.m5p.com>

Hi Elliot,

On 14/10/2020 02:37, Elliott Mitchell wrote:
> On Tue, Oct 13, 2020 at 06:06:26PM -0700, Stefano Stabellini wrote:
>> On Mon, 12 Oct 2020, Elliott Mitchell wrote:
>>> I'm on different hardware, but some folks have setup Tianocore for it.
>>> According to Documentation/arm64/acpi_object_usage.rst,
>>> "Required: DSDT, FADT, GTDT, MADT, MCFG, RSDP, SPCR, XSDT".  Yet when
>>> booting a Linux kernel directly on the hardware it lists APIC, BGRT,
>>> CSRT, DSDT, DBG2, FACP, GTDT, PPTT, RSDP, and XSDT.
>>>
>>> I don't know whether Linux's ACPI code omits mention of some required
>>> tables and merely panics if they're absent.  Yet I'm speculating the list
>>> of required tables has shrunk, SPCR is no longer required, and the
>>> documentation is out of date.  Perhaps SPCR was required in early Linux
>>> ACPI implementations, but more recent ones removed that requirement?
>>
>> I have just checked and SPCR is still a mandatory table in the latest
>> SBBR specification. It is probably one of those cases where the firmware
>> claims to be SBBR compliant, but it is not, and it happens to work with
>> Linux.
> 
> Is meeting the SBBR specification supposed to be a requirement of running
> Xen-ARM?

This is not my goal. We should try to get Xen running everywhere as long 
as this doesn't require a lot of extra code. IOW, don't ask me to 
review/accept a port of Xen to RPI3 ;).

Cheers,

-- 
Julien Grall


  reply index

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-26 20:55 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     ` Xen-ARM EFI/ACPI problems (was: Re: [PATCH 0/4] xen/arm: Unbreak ACPI) Elliott Mitchell
2020-10-17  5:12       ` 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 [this message]
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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