From: Gerd Hoffmann <kraxel@redhat.com>
To: "Philippe Mathieu-Daudé" <philmd@linaro.org>
Cc: Andrea Bolognani <abologna@redhat.com>,
Sunil V L <sunilvl@ventanamicro.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Alistair Francis <alistair.francis@wdc.com>,
Bin Meng <bin.meng@windriver.com>,
qemu-riscv@nongnu.org, qemu-devel@nongnu.org,
Andrew Jones <ajones@ventanamicro.com>,
Anup Patel <apatel@ventanamicro.com>,
Atish Kumar Patra <atishp@rivosinc.com>,
Ani Sinha <ani@anisinha.ca>,
"Michael S. Tsirkin" <mst@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
Igor Mammedov <imammedo@redhat.com>,
Thomas Huth <thuth@redhat.com>,
Bernhard Beschow <shentey@gmail.com>
Subject: Re: [PATCH 02/10] hw/riscv/virt: Add a switch to enable/disable ACPI
Date: Mon, 6 Feb 2023 13:56:10 +0100 [thread overview]
Message-ID: <20230206125610.nmo2bbbd5kosihav@sirius.home.kraxel.org> (raw)
In-Reply-To: <fe3b5794-be2a-eec7-9d4e-9a13eab48378@linaro.org>
On Mon, Feb 06, 2023 at 12:18:06PM +0100, Philippe Mathieu-Daudé wrote:
> On 6/2/23 11:54, Andrea Bolognani wrote:
> > On Thu, Feb 02, 2023 at 10:22:15AM +0530, Sunil V L wrote:
> > > + object_class_property_add(oc, "acpi", "OnOffAuto",
> > > + virt_get_acpi, virt_set_acpi,
> > > + NULL, NULL);
> > > + object_class_property_set_description(oc, "acpi",
> > > + "Enable ACPI");
> >
> > The way this works on other architectures (x86_64, aarch64) is that
> > you get ACPI by default and can use -no-acpi to disable it if
> > desired. Can we have the same on RISC-V, for consistency?
>
> -no-acpi rather seems a x86-specific hack for the ISA PC machine, and
> has a high maintenance cost / burden.
Under the hood it is actually a OnOffAuto machine property and -no-acpi
is just a shortcut to set that.
> Actually, what is the value added by '-no-acpi'?
On arm(64) the linux kernel can use either device trees or ACPI to find
the hardware. Historical reasons mostly, when the platform started
there was no ACPI support. Also the edk2 firmware uses Device Trees
for hardware discovery, likewise for historical reasons.
When ACPI is available for a platform right from the start I see little
reason to offer an option to turn it off though ...
take care,
Gerd
next prev parent reply other threads:[~2023-02-06 12:56 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-02 4:52 [PATCH 00/10] Add basic ACPI support for risc-v virt Sunil V L
2023-02-02 4:52 ` [PATCH 01/10] hw/riscv/virt: Add OEM_ID and OEM_TABLE_ID fields Sunil V L
2023-02-06 5:49 ` Bin Meng
2023-02-09 0:17 ` Alistair Francis
2023-02-02 4:52 ` [PATCH 02/10] hw/riscv/virt: Add a switch to enable/disable ACPI Sunil V L
2023-02-06 9:43 ` Bin Meng
2023-02-06 10:54 ` Andrea Bolognani
2023-02-06 11:18 ` Philippe Mathieu-Daudé
2023-02-06 12:35 ` Andrew Jones
2023-02-06 13:04 ` Sunil V L
2023-02-07 3:57 ` Bin Meng
2023-02-07 5:37 ` Andrew Jones
2023-02-07 12:33 ` Sunil V L
2023-02-06 12:56 ` Gerd Hoffmann [this message]
2023-02-07 8:50 ` Philippe Mathieu-Daudé
2023-02-07 10:12 ` Sunil V L
2023-02-07 10:14 ` Andrew Jones
2023-02-06 23:14 ` Bernhard Beschow
2023-02-07 10:23 ` Andrew Jones
2023-02-07 13:56 ` Andrea Bolognani
2023-02-07 14:02 ` Thomas Huth
2023-02-07 14:38 ` Andrea Bolognani
2023-02-07 19:20 ` Andrew Jones
2023-02-08 16:48 ` Andrea Bolognani
2023-02-09 5:15 ` Thomas Huth
2023-02-02 4:52 ` [PATCH 03/10] hw/riscv/virt: Add memmap pointer to RiscVVirtState Sunil V L
2023-02-06 9:50 ` Bin Meng
2023-02-09 0:18 ` Alistair Francis
2023-02-02 4:52 ` [PATCH 04/10] hw/riscv/virt: virt-acpi-build.c: Add basic ACPI tables Sunil V L
2023-02-06 10:17 ` Bin Meng
2023-02-06 13:24 ` Sunil V L
2023-02-07 16:10 ` Bin Meng
2023-02-07 18:15 ` Sunil V L
2023-02-08 1:06 ` Bin Meng
2023-02-08 4:49 ` Sunil V L
2023-02-24 16:14 ` Igor Mammedov
2023-02-02 4:52 ` [PATCH 05/10] hw/riscv/virt: virt-acpi-build.c: Add RINTC in MADT Sunil V L
2023-02-09 0:21 ` Alistair Francis
2023-02-02 4:52 ` [PATCH 06/10] hw/riscv/virt: virt-acpi-build.c: Add RHCT Table Sunil V L
2023-02-02 4:52 ` [PATCH 07/10] hw/riscv: meson.build: Build virt-acpi-build.c Sunil V L
2023-02-06 10:26 ` Bin Meng
2023-02-02 4:52 ` [PATCH 08/10] hw/riscv/Kconfig: virt: Enable ACPI config options Sunil V L
2023-02-06 10:29 ` Bin Meng
2023-02-06 14:19 ` Sunil V L
2023-02-02 4:52 ` [PATCH 09/10] hw/riscv/virt.c: Initialize the ACPI tables Sunil V L
2023-02-06 10:32 ` Bin Meng
2023-02-02 4:52 ` [PATCH 10/10] MAINTAINERS: Add entry for RISC-V ACPI Sunil V L
2023-02-06 10:33 ` Bin Meng
2023-02-09 0:23 ` Alistair Francis
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230206125610.nmo2bbbd5kosihav@sirius.home.kraxel.org \
--to=kraxel@redhat.com \
--cc=abologna@redhat.com \
--cc=ajones@ventanamicro.com \
--cc=alistair.francis@wdc.com \
--cc=ani@anisinha.ca \
--cc=apatel@ventanamicro.com \
--cc=armbru@redhat.com \
--cc=atishp@rivosinc.com \
--cc=bin.meng@windriver.com \
--cc=imammedo@redhat.com \
--cc=mst@redhat.com \
--cc=palmer@dabbelt.com \
--cc=philmd@linaro.org \
--cc=qemu-devel@nongnu.org \
--cc=qemu-riscv@nongnu.org \
--cc=shentey@gmail.com \
--cc=sunilvl@ventanamicro.com \
--cc=thuth@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).