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#! /bin/bash
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kvm_setup_powerpc () {
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    if grep '^platform[[:space:]]*:[[:space:]]*PowerNV' /proc/cpuinfo > /dev/null; then
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	# PowerNV platform, which is KVM HV capable
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	if [ -z "$SUBCORES" ]; then
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	    SUBCORES=1
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	fi
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	# Step 1. Load the KVM HVmodule
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	if ! modprobe -b kvm_hv; then
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	    return
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	fi
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	# On POWER8 a host core can only run threads of a single
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	# guest, meaning that SMT must be disabled on the host in
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	# order to run KVM guests. (Also applieds to POWER7, but we
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	# don't support that).
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	#
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	# POWER9 doesn't have this limitation (though it will for hash
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	# guests on radix host when that's implemented).  So, only set
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	# up subcores and disable SMT for POWER*.
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	if grep '^cpu[[:space:]]*:[[:space:]]*POWER8' /proc/cpuinfo > /dev/null; then
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	    # Step 2. Configure subcore mode
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	    /usr/sbin/ppc64_cpu --subcores-per-core=$SUBCORES
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	    # Step 3. Disable SMT (multithreading)
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	    /usr/sbin/ppc64_cpu --smt=off
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	fi
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    fi
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}
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case $(uname -m) in
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    ppc64|ppc64le)
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	kvm_setup_powerpc
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	;;
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esac
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exit 0