On Mon, Jun 27, 2016 at 02:01:24AM +0000, Wang, Wei W wrote: > On Sun 6/19/2016 10:14 PM, Wei Wang wrote: > > This RFC proposes a design of vhost-pci, which is a new virtio device type. > > The vhost-pci device is used for inter-VM communication. > > > > Changes in v2: > > 1. changed the vhost-pci driver to use a controlq to send acknowledgement > > messages to the vhost-pci server rather than writing to the device > > configuration space; > > > > 2. re-organized all the data structures and the description layout; > > > > 3. removed the VHOST_PCI_CONTROLQ_UPDATE_DONE socket message, which > > is redundant; > > > > 4. added a message sequence number to the msg info structure to identify > > socket > > messages, and the socket message exchange does not need to be blocking; > > > > 5. changed to used uuid to identify each VM rather than using the QEMU > > process > > id > > > > One more point should be added is that the server needs to send periodic > socket messages to check if the driver VM is still alive. I will add this > message support in next version. (*v2-AR1*)
Either the driver VM could go down or the device VM (server) could go down. In both cases there must be a way to handle the situation. If the server VM goes down it should be possible for the driver VM to resume either via hotplug of a new device or through messages reinitializing the dead device when the server VM restarts. Stefan
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