ryzen-msr.sh

#!/usr/bin/env bash
# based on https://lists.freebsd.org/pipermail/freebsd-current/2018-June/069799.html
get_value () {
	location="$1"
	cpu="$2"
	rdmsr --processor "$cpu" --decimal "$location" || exit "$?"
}
write_value () {
	location="$1"
	value="$2"
	cpu="$3"
	wrmsr --processor "$cpu" "$location" "$value" || exit "$?"
}
apply_fix () {
	location="$1"
	to_or="$2"
	fix_no="$3"
	exit_code=0
	for i in `seq 0 $(($(nproc)-1))`; do
		cpu="$i"
		current_value=$(get_value $location $cpu)
		new_value=$(("$current_value" | "$to_or"))
		write_value "$location" "$new_value" "$cpu"
		if [[ $(get_value $location $cpu) != $new_value ]]; then
			printf "May not have been set for fix %i Wrote value %X but value is now at %X\n" "$fix_no" $new_value $(get_value $location $cpu)
		fi
	done
}
## Comments are the errata numbers
# 1021
apply_fix 0xc0011029 0x2000 1021
# 1033
apply_fix 0xc0011020 0x10 1033
# 1049
apply_fix 0xc0011028 0x10 1049
# 1095
apply_fix 0xc0011020 0x200000000000000 1095