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KVM: PPC: Add documentation for magic page enhancements

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This documents how to detect additional features inside the magic
page when a guest maps it.

Signed-off-by: Alexander Graf <agraf@suse.de>
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Alexander Graf 2010-08-31 04:25:39 +02:00 committed by Avi Kivity
parent 344941beb9
commit d1e87c7ee6
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Documentation/kvm/ppc-pv.txt
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@ -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
========