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The optional object _CPC declares an interface that allows OSPM to transition the processor into a performance state based on a continuous range of allowable values. It is associated with HWP on intel CPUs. Although Linux intel_pstate driver can have its performance managing abilities without _CPC, it may still need this _CPC table to implement some features such as providing the kernel multi-core scheduler with core priority info. As currently we are giving guests a vHWP interface for the multi-core scheduler, this patch adds _CPC to the guest ACPI. _CPC is written only when the hypervisor decides the guest should have vHWP, using the existing pm hypercall ACRN_PMCMD_GET_PX_CNT. The idea is: - If the VM supports vHWP, then the guest is having continuous p-state. Thus it doesn't have a specific px_cnt. The hypercall returns success and px_cnt = 0. - If the VM's p-state is hidden or hv doesn't have its p-state info, the hypercall returns fail. Tracked-On: #8414 Signed-off-by: Wu Zhou <wu.zhou@intel.com> Reviewed-by: Jian Jun Chen <jian.jun.chen@intel.com> |
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| arch/x86 | ||
| bios | ||
| core | ||
| hw | ||
| include | ||
| lib | ||
| log | ||
| Makefile | ||
| README.rst | ||
| samples | ||
README.rst
ACRN Device Model ################# Introduction ============ The ACRN Device Model provides **device sharing** capabilities between the Service VM and post-launched User VMs. It is a component that is used in conjunction with the `ACRN Hypervisor`_ and is installed within the Service VM. .. _`ACRN Hypervisor`: https://github.com/projectacrn/acrn-hypervisor