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The current design has the following problem: uos kernel may update gvt bars' regions, but ACRN-DM doesn't know this update. ACRN-DM only know out-of-date gvt bar regions, For simplicity, mark these bar regions as OOD bar regions. uos kernel may allocate OOD bar regions for other pci devices, which will result in ACRN-DM bar regions inconsistency with uos kernel. The new design is the following: When other pci device update bar regions (1) ACRN-DM updates gvt bars' regions provided by a system file. (2) ACRN-DM updates this pci device bar regions v5 -> v6: * add more comments v4 -> v5: * remove & for callback func assignment v3 -> v4: * compare gpu bar address to avoid unnecessary * unregistered/registered operation v2 -> v3: * call unregister_bar and register_bar when update gvt bars * update gvt reserved regions when update gvt bars Tracked-On: projectacrn#4005 Signed-off-by: Junming Liu <junming.liu@intel.com> Reviewed-by: Zhao Yakui <yakui.zhao@intel.com> Reviewed-by: Liu XinYun <xinyun.liu@intel.com> Reviewed-by: Shuo A Liu <shuo.a.liu@intel.com> Acked-by: Yu Wang <yu1.wang@intel.com>