Commit d1e87c7e authored by Alexander Graf's avatar Alexander Graf Committed by Avi Kivity
Browse files

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: default avatarAlexander Graf <agraf@suse.de>
parent 344941be

Documentation/kvm/ppc-pv.txt

+14 −0
Original line number Diff line number Diff line
@@ -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

========