Virtual cpufreq driver
modulename: virtual-cpufreq.ko
configname: CONFIG_CPUFREQ_VIRT
Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Frequency scaling
└─>Virtual cpufreq driver
In linux kernel since version 6.13 (release Date: 2025-01-19)
This adds a virtualized cpufreq driver for guest kernels that
read/writes to a MMIO region for a virtualized cpufreq device to
communicate with the host. It sends performance requests to the host
which gets used as a hint to schedule vCPU threads and select CPU
frequency. If a VM does not support a virtualized FIE such as AMUs,
it updates the frequency scaling factor by polling host CPU frequency
to enable accurate Per-Entity Load Tracking for tasks running in the guest.
If in doubt, say N.
read/writes to a MMIO region for a virtualized cpufreq device to
communicate with the host. It sends performance requests to the host
which gets used as a hint to schedule vCPU threads and select CPU
frequency. If a VM does not support a virtualized FIE such as AMUs,
it updates the frequency scaling factor by polling host CPU frequency
to enable accurate Per-Entity Load Tracking for tasks running in the guest.
If in doubt, say N.