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

[Laszlo Ersek]

"acpi=off" is arguably unusual with UEFI guest OSes; add a note to explain
it. Original explanation by Drew Jones.

Cc: Andrei Warkentin <andrei.warkentin at intel.com>
Cc: Andrew Jones <ajones at ventanamicro.com>
Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
Cc: Gerd Hoffmann <kraxel at redhat.com>
Cc: Jiewen Yao <jiewen.yao at intel.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Sunil V L <sunilvl at ventanamicro.com>
Signed-off-by: Laszlo Ersek <lersek at 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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