docs/system/riscv: document acpi parameter of virt machine

Since QEMU v8.0.0 the RISC-V virt machine has a switch to disable ACPI
table generation. Add it to the documentation.

Fixes: 168b8c29cedb ("hw/riscv/virt: Add a switch to disable ACPI")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20231220193436.25909-1-heinrich.schuchardt@canonical.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/docs/system/riscv/virt.rst b/docs/system/riscv/virt.rst
index f5fa7b8b29e6d9a08e9f4f8deb3e6196d1a8b1d7..9a06f95a3444c1eb2e49b09d6821c3a943980687 100644 (file)
--- a/docs/system/riscv/virt.rst
+++ b/docs/system/riscv/virt.rst
@@ -95,6 +95,11 @@ The following machine-specific options are supported:
   SiFive CLINT. When not specified, this option is assumed to be "off".
   This option is restricted to the TCG accelerator.
 
+- acpi=[on|off|auto]
+
+  When this option is "on" (which is the default), ACPI tables are generated and
+  exposed as firmware tables etc/acpi/rsdp and etc/acpi/tables.
+
 - aia=[none|aplic|aplic-imsic]
 
   This option allows selecting interrupt controller defined by the AIA