Re: [edk2-devel] [PATCH 2/3] OvmfPkg/RiscVVirt/README: explain the "acpi=off" machine property

["Ard Biesheuvel" <ardb@kernel.org>]

On Wed, 13 Sept 2023 at 12:56, Laszlo Ersek <lersek@redhat.com> wrote:
>
> "acpi=off" is arguably unusual with UEFI guest OSes; add a note to explain
> it. Original explanation by Drew Jones.
>

Out of curiosity: how is this different from the -no-acpi QEMU command
line option?


> Cc: Andrei Warkentin <andrei.warkentin@intel.com>
> Cc: Andrew Jones <ajones@ventanamicro.com>
> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Jordan Justen <jordan.l.justen@intel.com>
> Cc: Sunil V L <sunilvl@ventanamicro.com>
> Signed-off-by: Laszlo Ersek <lersek@redhat.com>
> ---
>  OvmfPkg/RiscVVirt/README.md | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/OvmfPkg/RiscVVirt/README.md b/OvmfPkg/RiscVVirt/README.md
> index 193e4afe8dee..1dba1a26af2d 100644
> --- a/OvmfPkg/RiscVVirt/README.md
> +++ b/OvmfPkg/RiscVVirt/README.md
> @@ -70,6 +70,11 @@ Below example shows how to boot openSUSE Tumbleweed E20.
>          -device virtio-blk-device,drive=hd0 \
>          -drive file=openSUSE-Tumbleweed-RISC-V-E20-efi.riscv64.raw,format=raw,id=hd0
>
> +    Note: the `acpi=off` machine property is specified because Linux guest
> +    support for ACPI (that is, the ACPI consumer side) is a work in progress.
> +    Currently, `acpi=off` is recommended unless you are developing ACPI support
> +    yourself.
> +
>  ## Test with your own OpenSBI binary
>  Using the above QEMU command line, **RISCV_VIRT_CODE.fd** is launched by the
>  OpenSBI binary that is bundled with QEMU. You can build your own OpenSBI binary
>


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