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OpRegion: 8KB(0x2000) [ OpRegion Header ] Offset: 0x0 [ Mailbox #1: ACPI ] Offset: 0x100 [ Mailbox #2: SWSCI ] Offset: 0x200 [ Mailbox #3: ASLE ] Offset: 0x300 [ Mailbox #4: VBT ] Offset: 0x400 [ Mailbox #5: ASLE EXT ] Offset: 0x1C00 Extended OpRegion: 8KB(0x2000) [ Raw VBT ] Offset: 0x0 Generally VBT stores in MailBox4 in OpRegion which max size is 6KB. If VBT larger than 6KB, it will be stored in extended OpRegion which is neighborhood with legacy OpRegion. In this case, we need to passthrough extended OpRegion also to support GVT-d feature. The OpRegion size that we passthrough should be (OpRegion+Extended)=16KB ASLE.rvda stores the location of VBT. For OpRegion 2.1+: ASLE.rvda = offset to OpRegion base address For OpRegion 2.0: ASLE.rvda = physical address To-do: Add support for OpRegion on some platforms(eg. APL) Tracked-On: #5029 Signed-off-by: Sun Peng <peng.p.sun@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/