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#!/bin/ash
# This script checks whether given VMware version supports the CPU:
# * Intel: check for "VMX Unrestricted Guest" CPU flag
# * AMD: check if CPU family is Bulldozer or newer
#
# It can be called inside a dracut context and tries to do
# chroot magic to call/load the required tools.
VIRTTYPE="$( grep -m1 '^flags\s*:' /proc/cpuinfo | grep -woF -e svm -e vmx )"
if [ -z "$VIRTTYPE" ]; then
# No need to bother with msr
echo "legacy"
exit 0
fi
modprobe msr
version="legacy"
if [ "$VIRTTYPE" = "vmx" ]; then # intel
BIT1="$( rdmsr --bitfield 0:0 0x3a 2>/dev/null || echo "fail" )"
BIT2="$( rdmsr --bitfield 2:2 0x3a 2>/dev/null || echo "fail" )"
if [ "$BIT1" = "0" ] || [ "$BIT2" = "1" ]; then
flag="$( rdmsr --bitfield 5:5 0x485 )"
[ "$flag" = "1" ] && version="new"
fi
elif [ "$VIRTTYPE" = "svm" ]; then # amd
BIT="$( rdmsr --bitfield 4:4 0xc0010114 2>/dev/null || echo "fail" )"
if [ "$BIT" = "0" ]; then
family="$( awk '$1$2 == "cpufamily" {print $NF;exit}' /proc/cpuinfo )"
[ "$family" -ge 21 ] && version="new"
fi
fi
echo "$version"
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