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[v3,22/22] docs/system: riscv: Document AIA options for virt machine

Message ID 20211023084638.1697057-23-anup.patel@wdc.com
State New
Headers show
Series QEMU RISC-V AIA support | expand

Commit Message

Anup Patel Oct. 23, 2021, 8:46 a.m. UTC 
We have two new machine options "aia" and "aia-guests" available
for the RISC-V virt machine so let's document these options.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 docs/system/riscv/virt.rst | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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Patch

diff --git a/docs/system/riscv/virt.rst b/docs/system/riscv/virt.rst
index fa016584bf..373645513a 100644
--- a/docs/system/riscv/virt.rst
+++ b/docs/system/riscv/virt.rst
@@ -63,6 +63,22 @@  The following machine-specific options are supported:
   When this option is "on", ACLINT devices will be emulated instead of
   SiFive CLINT. When not specified, this option is assumed to be "off".
 
+- aia=[none|aplic|aplic-imsic]
+
+  This option allows selecting interrupt controller defined by the AIA
+  (advanced interrupt architecture) specification. The "aia=aplic" selects
+  APLIC (advanced platform level interrupt controller) to handle wired
+  interrupts whereas the "aia=aplic-imsic" selects APLIC and IMSIC (incoming
+  message signaled interrupt controller) to handle both wired interrupts and
+  MSIs. When not specified, this option is assumed to be "none" which selects
+  SiFive PLIC to handle wired interrupts.
+
+- aia-guests=nnn
+
+  The number of per-HART VS-level AIA IMSIC pages to be emulated for a guest
+  having AIA IMSIC (i.e. "aia=aplic-imsic" selected). When not specified,
+  the default number of per-HART VS-level AIA IMSIC pages is 0.
+
 Running Linux kernel
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