David Dai e9426a6ace aarch64: devices: Add a virtual cpufreq device ... Introduce support for a virtual CPU frequency device to improve guest task placement behaviour along with performance and power usage of workloads within VMs[1]. This device adds MMIO regions that enables the guest to: - Query for the frequency of the physical CPU that the current vCPU is affined to. - Send frequency requests that can be used as hint for the host to schedule vCPU threads and choose physical CPU frequency. Add a config option "--virt-cpufreq" that enables the virtual cpu device and populates the frequencies of vCPUs through devicetree, which can be used by a guest kernel cpufreq driver[2]. [1] https://lore.kernel.org/all/20230330224348.1006691-1-davidai@google.com/ [2] https://android-review.git.corp.google.com/c/kernel/common/+/2239182 Bug: None Test: ./tools/presubmit Change-Id: I03983c5e4a3fa288ca19504aa093ad1f7f9f7e51 Signed-off-by: David Dai <davidai@google.com> Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4504738 Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>		2023-05-11 21:13:57 +00:00
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src	aarch64: devices: Add a virtual cpufreq device	2023-05-11 21:13:57 +00:00
Cargo.toml