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Allows safer access to model specific registers (MSRs)
License: GNU Lesser General Public License v3.0
This project forked from llnl/msr-safe
Allows safer access to model specific registers (MSRs)
License: GNU Lesser General Public License v3.0
MSR-SAFE ======== The msr-safe.ko module is comprised of the following source files: Makefile msr_entry.c Original MSR driver with added calls to batch and whitelist implementations. msr_batch.[ch] MSR batching implementation msr_whitelist.[ch] MSR Whitelist implementation whitelists Sample text whitelist that may be input to msr_safe Kernel Build & Load ------------------- Building the msr-safe.ko module can be done with the commands below. A successful load of the msr-safe kernel module will have `msr_batch` and `msr_whitelist` in `/dev/cpu`, and will have an `msr_safe` present under each CPU directory in `/dev/cpu/*`. git clone https://github.com/LLNL/msr-safe cd msr-safe make insmod msr-safe.ko Configuration Notes After Install --------------------------------- Setup permissions and group ownership for `/dev/cpu/msr_batch`, `/dev/cpu/msr_whitelist`, and `/dev/cpu/*/msr_safe` as you like since the whitelist will protect you from harm. Sample whitelists for specific architectures are provided in `whitelists/` directory. These are meant to be a starting point, and should be used with caution. Each site may add to, remove from, or modify the write masks in the whitelist depending on specific needs. To configure whitelist: cat whitelist/wl_file > /dev/cpu/msr_whitelist Where `wl_file` can be determined as follows: printf 'wl_%.2x%x\n' $(lscpu | grep "CPU family:" | awk -F: '{print $2}') $(lscpu | grep "Model:" | awk -F: '{print $2}') To confirm successful whitelist configured: cat /dev/cpu/msr_whitelist To enumerate the current whitelist (i.e., implies whitelist was loaded successfully): cat < /dev/cpu/msr_whitelist To remove whitelist (as root): echo > /dev/cpu/msr_whitelist msrsave ------- The msrsave utility provides a mechanism for saving and restoring MSR values based on entries in the whitelist. To restore MSR values, the register must have an appropriate writemask. Release ------- msr-safe is released under the GPLv3 license. For more details, please see the [LICENSE](https://github.com/LLNL/msr-safe/blob/master/LICENSE) file.
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