On 9/3/25 06:49, Hector Cao wrote:
On recent Intel CPUs, some of the CPU features (mostly vmx-* subfeatures) are listed and controlled via the MSRs (Model Specific Registers) instead of the traditional CPUID instruction method.
To be able to read the MSR's values, the kernel module msr has to be loaded and the values can be read via /dev/cpu/*/msr.
This commit introduces following changes:
- install modules-load file for msr this is only enabled: - On x86 arch - If user asks for it explicitly via a build option: meson -Dmsr_module_load=true build By default, it is disabled.
Thanks for the build option, and having it disabled by default! Some distros or distro flavors may not want this functionality. Also, AFAIK it's only needed for the qemu driver. If libvirt is built with support for multiple hypervisors, the file will be installed on those deployments too. E.g. it would needlessly be installed on a Xen deployment when libvirt is built with '-Ddriver_qemu=enabled -Ddriver_libxl=enabled -Dmsr_module_load=true'. Regards, Jim