Dynamic routing through virtual appliances

1. A method comprising:

executing, by a processing device, a hypervisor;

identifying a first virtual machine comprising a first virtual appliance, a second virtual machine comprising a second virtual appliance, and a third virtual machine comprising a virtual server that provides a service to a client of the virtual server;

receiving from the client, by the processing device, a data packet that is addressed to the virtual server;

in response to receiving the data packet, routing, by the hypervisor, the packet to the virtual server via the first virtual appliance and the second virtual appliance, wherein the routing comprises:

writing, by the hypervisor, the data packet to a buffer in a shared memory;

mapping, by the hypervisor, the buffer to a memory space of the first virtual appliance;

receiving from the first virtual appliance, by the hypervisor, a first signal indicating that the first virtual appliance has completed operating on the data packet;

in response to the first signal, mapping, by the hypervisor, the buffer to a memory space of the second virtual appliance;

receiving from the second virtual appliance, by the hypervisor, a second signal indicating that the second virtual appliance has completed operating on the data packet; and

in response to the second signal, sending, by the hypervisor, the data packet to the virtual server.

2. The method of claim 1 wherein the routing of the data packet from the client to the virtual server is transparent to the client.

3. A non-transitory computer readable storage medium having instructions that, when executed by a processing device, cause the processing device to:

execute, by the processing device, a hypervisor;

identify a first virtual machine comprising a first virtual appliance, a second virtual machine comprising a second virtual appliance, and a third virtual machine comprising a virtual desktop that provides a service to a client of the virtual desktop;

receive from the client, by the processing device, a data packet that is addressed to the virtual desktop;

in response to receiving the data packet, route, by the hypervisor, the packet to the virtual desktop via the first virtual appliance and the second virtual appliance, wherein to route the packet the hypervisor is to:

write, by the hypervisor, the data packet to a buffer in a shared memory;

map, by the hypervisor, the buffer to a memory space of the first virtual appliance;

receive from the first virtual appliance, by the hypervisor, a first signal indicating that the first virtual appliance has completed operating on the data packet;

in response to the first signal, map, by the hypervisor, the buffer to a memory space of the second virtual appliance;

receive from the second virtual appliance, by the hypervisor, a second signal indicating that the second virtual appliance has completed operating on the data packet; and

in response to the second signal, send, by the hypervisor, the data packet to the virtual desktop.

4. The non-transitory computer readable storage medium of claim 3 , wherein the routing of the data packet from the client to the virtual desktop is transparent to the client.

5. A computing device comprising:

a memory to store instructions for a first virtual machine comprising a first virtual appliance, a second virtual machine comprising a second virtual appliance, and a third virtual machine comprising a virtual server that provides a service to a client of the virtual server; and

a processing device operatively coupled to the memory, wherein the processing device is to:

execute, by the processing device, a hypervisor;

receive from the client, by the processing device, a data packet that is addressed to the virtual server;

in response to receiving the data packet, route, by the hypervisor, the packet to the virtual server via the first virtual appliance and the second virtual appliance, wherein to route the packet, the hypervisor is to:

write the data packet to a buffer in a shared memory;

map the buffer to a memory space of the first virtual appliance;

receive, from the first virtual appliance, a first signal indicating that the first virtual appliance has completed operating on the data packet;

in response to the first signal, map the buffer to a memory space of the second virtual appliance;

receive, from the second virtual appliance, a second signal indicating that the second virtual appliance has completed operating on the data packet; and

in response to the second signal, send the data packet to the virtual server.

6. The computing device of claim 5 , wherein the routing of the data packet from the client to the virtual server is transparent to the client.

7. The method of claim 1 wherein the first signal received from the first virtual appliance is an interrupt.

8. The method of claim 1 wherein the data packet is modified by the operating on the data packet by the first virtual appliance, and wherein the hypervisor further receives from the first virtual appliance the modified data packet.

9. The method of claim 8 wherein the modified data packet is provided to the hypervisor by the first virtual appliance via a zero copy operation.

10. The non-transitory computer readable storage medium of claim 3 wherein the first signal received from the first virtual appliance is an interrupt.

11. The non-transitory computer readable storage medium of claim 3 wherein the data packet is modified by the operating on the data packet by the first virtual appliance, and wherein the hypervisor further receives from the first virtual appliance the modified data packet.

12. The non-transitory computer readable storage medium of claim 11 wherein the modified data packet is provided to the hypervisor by the first virtual appliance via a zero copy operation.

13. The computing device of claim 5 wherein the first signal received from the first virtual appliance is an interrupt.

14. The computing device of claim 5 wherein the data packet is modified by the operating on the data packet by the first virtual appliance, and wherein the hypervisor further receives from the first virtual appliance the modified data packet.

15. The computing device of claim 14 wherein the modified data packet is provided to the hypervisor by the first virtual appliance via a zero copy operation.