diff --git a/specification/07-theory_operations.adoc b/specification/07-theory_operations.adoc index 71a53af..9f2a005 100644 --- a/specification/07-theory_operations.adoc +++ b/specification/07-theory_operations.adoc @@ -839,3 +839,50 @@ TVM ->> TVM: Use device interface .... === Interface Unbinding + +=== Device and Interface Lifecycle + +When combined together, the flows and ABIs described in the previous sections +are used to build the lifecycle of a TDISP capable device on a CoVE-IO +compatible platform, as illustrated in the follwing figure: + +[[COVE_IO_LIFECYCLE]] +.Device and Interface Lifecycle +image::images/cove-io-lifecycle.svg[align="center"] + +The host supervisor domain manager owns the physical device, and manages its +lifecycle. The TSM enforces that this lifecycle management is done without +compromising any TVM confidential assets. + +As the platform resources owner, the host supervisor domain manager can assign +a TDI to a TVM by binding them together (step 3). At any point in time, it can +reclaim that physical resource by unbinding (step 8a) it from its TVM. + +Before binding a TDI and a TVM together, the host supervisor domain manager must +first require the TSM to connect (step 1) to the physical device through secured +SPDM. As part of servicing that request, the TSM also protects the physical link +with PCIe IDE. + +The host supervisor domain manager is also required to explictly add the TDI +MMIO regions to the TDI (step 2). The TSM can prepare and allocate the TVM +second stage page tables and map those I/O regions into the guest physical +address space. The TSM does not enable those tables until the TVM starts the +interface (step 6) + +Only once the TSM is securily connected to the physical device, The host +supervisor domain manager can proceed with binding a device interface and a TVM +together. Once bound to a TVM, the device interface is locked but the MMIO and +DMA paths between the two are not enabled yet. + +The TVM to which a TDI is bound to is the I/O gatekeeper. After detecting and +verifying (steps 4 and 5) the bound interface, it may accept it into its TCB and +enable all I/O paths between the two parties. The TVM may only use a bound TDI +(step 7) after accepting it, by requesting the TSM to start the device interface +(step 6). + +Both the host supervisor domain manager and the TVM can disable I/O between the +TDI and the TVM, by respectively unbinding (step 8a) or stopping the device +interface (step 8b). + +Finally, the host supervisor domain manager can fully reclaim the physical +device by requesting the TSM to disconnect (step 10) from it. diff --git a/specification/images/cove-io-lifecycle.svg b/specification/images/cove-io-lifecycle.svg new file mode 100644 index 0000000..b25303a --- /dev/null +++ b/specification/images/cove-io-lifecycle.svg @@ -0,0 +1,2468 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 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