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authorAlexander Graf <agraf@suse.de>2010-08-31 04:25:39 +0200
committerAvi Kivity <avi@redhat.com>2010-10-24 10:52:22 +0200
commitd1e87c7ee65a20b10faf7e59dbe2cc934c32473b (patch)
tree8f28ef6f662e391e0c7b4dcc387927eb2aba2979 /Documentation/kvm
parent344941beb9926418663e171a347d1a31d727fe45 (diff)
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>
Diffstat (limited to 'Documentation/kvm')
-rw-r--r--Documentation/kvm/ppc-pv.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/kvm/ppc-pv.txt b/Documentation/kvm/ppc-pv.txt
index 922cf954bd99..a7f2244b3be9 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
========