![]() The MMIO operations that read or populate packets are synchronous, so setting up one page to pass back and forth is feasible. These can be anywhere in physical memory, and are relatively short. The format for the latter is unimportant for the features described on this page - you need only know that the region can be interpreted as an array of 32-bit unsigned integers and offset 3 contains the IRQ mask.Ĭommunication between the guest and the host happens through packets in memory. BAR0 is the MMIO port and BAR1 is a memory region that contains some shared state for the device, such as a bit mask for what events the guest wishes to receive. ![]() The PCI device has the vendor ID 0x80EE, same as the VirtualBox implementation of the Bochs display adapter, and a device ID of 0xCAFE. ![]() A combination of memory-mapped packets, MMIO port writes, and IRQs allow the guest to communicate its feature support to the VM and for the VM to communicate events such as display changes and mouse movement. The Guest Additions package operates through a PCI/mmio device provided by the VM. ![]()
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