From d1e87c7ee65a20b10faf7e59dbe2cc934c32473b Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Tue, 31 Aug 2010 04:25:39 +0200
Subject: [PATCH] KVM: PPC: Add documentation for magic page enhancements
This documents how to detect additional features inside the magic
page when a guest maps it.
Signed-off-by: Alexander Graf <agraf@suse.de>
---
Documentation/kvm/ppc-pv.txt | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/Documentation/kvm/ppc-pv.txt b/Documentation/kvm/ppc-pv.txt
index 922cf954bd992..a7f2244b3be90 100644
--- a/Documentation/kvm/ppc-pv.txt
+++ b/Documentation/kvm/ppc-pv.txt
@@ -102,6 +102,20 @@ struct kvm_vcpu_arch_shared {
Additions to the page must only occur at the end. Struct fields are always 32
or 64 bit aligned, depending on them being 32 or 64 bit wide respectively.
+Magic page features
+===================
+
+When mapping the magic page using the KVM hypercall KVM_HC_PPC_MAP_MAGIC_PAGE,
+a second return value is passed to the guest. This second return value contains
+a bitmap of available features inside the magic page.
+
+The following enhancements to the magic page are currently available:
+
+ KVM_MAGIC_FEAT_SR Maps SR registers r/w in the magic page
+
+For enhanced features in the magic page, please check for the existence of the
+feature before using them!
+
MSR bits
========
--
2.30.2