On 03/06/2010 01:52 AM, Cam Macdonell wrote:
Support an inter-vm shared memory device that maps a shared-memory object as a PCI device in the guest. This patch also supports interrupts between guest by communicating over a unix domain socket. This patch applies to the qemu-kvm repository. This device now creates a qemu character device and sends 1-bytes messages to trigger interrupts. Writes are trigger by writing to the "Doorbell" register on the shared memory PCI device. The lower 8-bits of the value written to this register are sent as the 1-byte message so different meanings of interrupts can be supported. Interrupts are supported between multiple VMs by using a shared memory server -ivshmem<size in MB>,[unix:<path>][file] Interrupts can also be used between host and guest as well by implementing a listener on the host that talks to shared memory server. The shared memory server passes file descriptors for the shared memory object and eventfds (our interrupt mechanism) to the respective qemu instances.
Can you provide a spec that describes the device? This would be useful for maintaining the code, writing guest drivers, and as a framework for review.
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