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#!/bin/bash
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kvm_setup_powerpc () {
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isPowerNV=no
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isPOWER8=no
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grep -q '^platform[[:space:]]*:[[:space:]]*PowerNV' /proc/cpuinfo && isPowerNV=yes
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grep -q '^cpu[[:space:]]*:[[:space:]]*POWER8' /proc/cpuinfo && isPOWER8=yes
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if [ "$isPowerNV" = "yes" ] ; then
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# PowerNV platform, which is KVM HV capable
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if [ -z "$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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# Additionally, POWER8 guests can't benefit from transparent
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# hugepages used to back them, and THPs allocated by any app
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# can potentially interfere with HPT allocation (if they
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# become locked, they can fragment the CMA). So, also disable
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# THPs system wide.
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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 [ "$isPOWER8" = "yes" ] ; then
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# Step 2. Configure subcore mode
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/usr/sbin/ppc64_cpu --subcores-per-core=$SUBCORES
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# Step 3. Disable SMT (multithreading)
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/usr/sbin/ppc64_cpu --smt=off
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# Step 4. Disable transparent hugepages (THP)
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echo never > /sys/kernel/mm/transparent_hugepage/enabled
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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
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