Input output memory management unit based zero copy virtual machine to virtual machine communication

摘要

In an example embodiment, a hypervisor exposes a virtual input-output memory management unit (IOMMU) to a first virtual machine. The first virtual machine includes a first guest operating system (OS). The hypervisor exposes a first virtual device to the first virtual machine. The hypervisor exposes a shared memory device to a second virtual machine. The second virtual machine includes a second guest OS. The hypervisor detects that the first guest OS modified the virtual IOMMU to provide access to a memory page of the first virtual machine. The hypervisor receives a base address from the second virtual machine. The base address is programmed into the shared memory device by the second virtual machine. The hypervisor maps the memory page into the second virtual machine at a page address, which is determined from the base address and a bus address.