On 06/26/2010 02:25 AM, Alexander Graf wrote:
We just introduced a new PV interface that screams for documentation. So here
it is - a shiny new and awesome text file describing the internal works of
the PPC KVM paravirtual interface.
+Querying for existence
+======================
+
+To find out if we're running on KVM or not, we overlay the PVR register.
Usually
+the PVR register contains an id that identifies your CPU type. If, however, you
+pass KVM_PVR_PARA in the register that you want the PVR result in, the register
+still contains KVM_PVR_PARA after the mfpvr call.
+
+ LOAD_REG_IMM(r5, KVM_PVR_PARA)
+ mfpvr r5
+ [r5 still contains KVM_PVR_PARA]
+
+Once determined to run under a PV capable KVM, you can now use hypercalls as
+described below.
On x86 we allow host userspace to determine whether the guest sees the
paravirt interface (and what features are exposed). This allows you to
live migrate from a newer host to an older host, by not exposing the
newer features.
--
error compiling committee.c: too many arguments to function
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