4b03f3002e
Some passthrough devices have no reset mechanisms which cause the device stay in unknown status during boot/reboot flow. And such unknown status cause unexpected behaviors in the guest. Except the ordinary reset mechanisms like FLR, we can utilize enter/exit D3cold as the reset that D3cold will power gate the entire hardware. But the D3cold is implemented as ACPI method which has no user interface in the SOS side. But the D3cold is implemented as ACPI method which has no user interface in the SOS side. But base on our experience, some devices can utilize D3hot instead of D3cold. But it is not useful for all PCI devices as the power status of D3hot is implementation defined. Provide one new API to program PowerState(D0/D1/D2/D3hot) in PMCSR register. Add "d3hot_reset" sub-parameter for passthrough device to enable utilize enter/exit D3hot flow to implement reset mechanisms. Tracked-On: #5067 Signed-off-by: Long Liu <long.liu@intel.com> Reviewed-by: Yuan Liu <yuan1.liu@intel.com> Acked-by: Yu Wang <yu1.wang@intel.com> |
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| MAINTAINERS | ||
| Makefile | ||
| README.rst | ||
README.rst
ACRN Device Model ################# Introduction ============ The ACRN Device Model provides **device sharing** capabilities between the Service OS and Guest OSs. It is a component that is used in conjunction with the `ACRN Hypervisor`_ and this is installed within the Service OS. You can find out more about Project ACRN on the `Project ACRN documentation`_ website. .. _`ACRN Hypervisor`: https://github.com/projectacrn/acrn-hypervisor .. _`Project ACRN documentation`: https://projectacrn.github.io/