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#! /bin/bash

kvm_setup_powerpc () {
    if grep '^platform[[:space:]]*:[[:space:]]*PowerNV' /proc/cpuinfo > /dev/null; then
	# PowerNV platform, which is KVM HV capable

	if [ -z "$SUBCORES" ]; then
	    SUBCORES=1
	fi

	# Step 1. Load the KVM HVmodule
	if ! modprobe -b kvm_hv; then
	    return
	fi

	# On POWER8 a host core can only run threads of a single
	# guest, meaning that SMT must be disabled on the host in
	# order to run KVM guests. (Also applieds to POWER7, but we
	# don't support that).
	#
	# POWER9 doesn't have this limitation (though it will for hash
	# guests on radix host when that's implemented).  So, only set
	# up subcores and disable SMT for POWER*.
	if grep '^cpu[[:space:]]*:[[:space:]]*POWER8' /proc/cpuinfo > /dev/null; then
	    # Step 2. Configure subcore mode
	    /usr/sbin/ppc64_cpu --subcores-per-core=$SUBCORES

	    # Step 3. Disable SMT (multithreading)
	    /usr/sbin/ppc64_cpu --smt=off
	fi
    fi
}

kvm_setup_s390x () {
    if grep -q "^features.*sie" /proc/cpuinfo; then
        modprobe kvm
    fi
}

case $(uname -m) in
    ppc64|ppc64le)
	kvm_setup_powerpc
	;;
    s390x)
	kvm_setup_s390x
	;;
esac

exit 0