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In order to add GVT-D support, we need pass through stolen memory and opregion memroy to the post-launched VM. To implement this, we first reserve the GPA for stolen memory and opregion memory through post-launched VM e820 table. Then we would build EPT mapping between the GPA and the stolen memory and opregion memory real HPA. The last, we need to return the GPA to post-launched VM if it wants to read the stolen memory and opregion memory address and prevent post-launched VM to write the stolen memory and opregion memory address register for now. We do the GPA reserve and GPA to HPA EPT mapping in ACRN-DM and the stolen memory and opregion memory CFG space register access emulation in ACRN-HV. Tracked-On: #4371 Signed-off-by: Li Fei1 <fei1.li@intel.com>
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/