HANDLING MEMORY-MAPPED INPUT-OUTPUT (MMIO) BASED INSTRUCTIONS USING FAST ACCESS ADDRESSES

摘要

When a guest of a virtual machine attempts to accesses an address that causes an exit from the guest to the hypervisor of a host, the hypervisor receives an indication of an exit by a guest to the hypervisor. The received address is associated with a memory-mapped input-output (MMIO) instruction. The hypervisor determines, based on the received indication, that the exit is associated with the memory-mapped input-output (MMIO) instruction. The hypervisor identifies the address that caused the exit as a fast access address. The hypervisor identifies one or more memory locations associated with the fast access address, where the one or more memory locations store information associated with the MMIO instruction. The hypervisor identifies the MMIO instruction based on the stored information. The hypervisor executes the MMIO instruction on behalf of the guest.

主权项

1. A method, comprising:
receiving, by a hypervisor of a host, an indication of an exit by a guest to the hypervisor; determining, by the hypervisor, based on the received indication, that the exit is associated with a memory-mapped input-output (MMIO) instruction; identifying, by the hypervisor, an address that caused the exit as a fast access address; identifying, by the hypervisor, one or more memory locations associated with the fast access address, wherein the one or more memory locations store information associated with the MMIO instruction; identifying, by the hypervisor, the MMIO instruction based on the stored information; and executing, by the hypervisor, the MMIO instruction on behalf of the guest.