Sharing data via virtual machine to host device bridging

A method, comprising:

• reading, by a first driver, a first descriptor available in a first ring supplied by an assigned device including data storage, wherein a first virtual machine (VM) includes a quest device, a second VM includes the first driver and a virtual host device for use by the guest device, and the second VM is in communication with the assigned device via the first driver and in communication with the guest device via a second driver in the second VM;
• reading, by the second driver, a second descriptor available in a second ring supplied by the guest device, wherein the assigned device, via the first ring, is in communication with the guest device, via the second ring, where the guest device communicates directly with the virtual host device on a data path, through the second VM, without a hypervisor executing on the data path;
• translating, by the second driver after reading the second descriptor, an address in the first VM of the guest device using an offset within a register of the virtual host device;
• performing, by the first driver after reading the first descriptor, a first operation on at least one first packet within the first ring of the assigned device;
• and
• performing, by the second driver, a second operation on at least one second packet within the second ring of the guest device in the first VM based on the translated address without the hypervisor executing on the data path, wherein the second VM is configured to access the register of the virtual host device to write the second descriptor used in the second ring of the quest device and access a register of a pass-through device in the second VM to write the first descriptor used in a first ring supplied by the assigned device.

A non-transitory machine readable medium storing a program, which when executed by a processor, causes the processor to:

• read, by a first driver, a first descriptor available in a first ring supplied by an assigned device including data storage, wherein a first virtual machine (VM) includes a guest device, a second VM includes the first driver and a virtual host device for use by the guest device, and the second VM is in communication with the assigned device via the first driver and in communication with the quest device via a second driver in the second VM;
• read, by the second driver, a second descriptor available in a second ring supplied by the guest device, wherein the assigned device, via the first ring, is in communication with the guest device, via the second ring, where the guest device communicates directly with the virtual host device on a data path, through the second VM, without a hypervisor executing on the data path;
• translate, by the second driver after reading the second descriptor, an address in the first VM of the guest device using an offset within a register of the virtual host device;
• perform, by the first driver after reading the first descriptor, a first operation on at least one first packet within the first ring of the assigned device;
• and
• perform, by the second driver, a second operation on at least one second packet within the second ring of the guest device in the first VM based on the translated address without the hypervisor executing on the data path, wherein the second VM is configured to access the register of the virtual host device to write the second descriptor used in the second ring of the quest device and access a register of a pass-through device in the second VM to write the first descriptor used in a first ring supplied by the assigned device.