[PATCH v3 18/33] KVM: PPC: Book3S HV: Nested guest entry via hypercall

[David Gibson]

On Tue, Oct 02, 2018 at 09:31:17PM +1000, Paul Mackerras wrote:
> This adds a new hypercall, H_ENTER_NESTED, which is used by a nested
> hypervisor to enter one of its nested guests.  The hypercall supplies
> register values in two structs.  Those values are copied by the level 0
> (L0) hypervisor (the one which is running in hypervisor mode) into the
> vcpu struct of the L1 guest, and then the guest is run until an
> interrupt or error occurs which needs to be reported to L1 via the
> hypercall return value.
> 
> Currently this assumes that the L0 and L1 hypervisors are the same
> endianness, and the structs passed as arguments are in native
> endianness.  If they are of different endianness, the version number
> check will fail and the hcall will be rejected.
> 
> Nested hypervisors do not support indep_threads_mode=N, so this adds
> code to print a warning message if the administrator has set
> indep_threads_mode=N, and treat it as Y.
> 
> Signed-off-by: Paul Mackerras <paulus at ozlabs.org>

Reviewed-by: David Gibson <david at gibson.dropbear.id.au>
-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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