CONFIG_CPUFREQ_VIRT: Virtual cpufreq driver

General informations

The Linux kernel configuration item CONFIG_CPUFREQ_VIRT:

• prompt: Virtual cpufreq driver
• type: tristate
• depends on: CONFIG_GENERIC_ARCH_TOPOLOGY
• defined in drivers/cpufreq/Kconfig
• found in Linux kernels: 6.13–6.14, 6.15-rc+HEAD
• modules built: virtual-cpufreq

Help text

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.

Hardware

LKDDb

Raw data from LKDDb:

• lkddb module virtual-cpufreq CONFIG_CPUFREQ_VIRT : drivers/cpufreq/Kconfig : "Virtual cpufreq driver" # in 6.13–6.14, 6.15-rc+HEAD
• lkddb of "" "" "qemu,virtual-cpufreq" : CONFIG_CPUFREQ_VIRT CONFIG_CPU_FREQ : drivers/cpufreq/virtual-cpufreq.c # in 6.13–6.14, 6.15-rc+HEAD
• lkddb platform "virt-cpufreq" : CONFIG_CPUFREQ_VIRT CONFIG_CPU_FREQ : drivers/cpufreq/virtual-cpufreq.c # in 6.13–6.14, 6.15-rc+HEAD

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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