Virtual device translation for nested virtual machines

A system comprising:

• a memory device;
• and
• a processing device, operatively coupled with the memory device, to:
• run, by a host computer system, a hypervisor managing a first virtual machine;
• receive, by the hypervisor, a request to create a second virtual machine nested within the first virtual machine;
• determine whether the request to create the second virtual machine includes a request to use a physical address as a virtual address for a peripheral device;
• and
• initialize a first data structure for address translation of the physical addresses of the second virtual machine corresponding to virtual addresses of the peripheral device to host virtual addresses when the request to create the second virtual machine includes the request to use the physical address as the virtual address for the peripheral device, wherein the first data structure includes an offset based on a difference between a first starting address on a memory buffer associated with a host physical address and a second starting address on the memory buffer associated with a host virtual address that is based on an addition of the offset to a guest physical address of the first virtual machine,
• receive, by the peripheral device, a request from the second virtual machine;
• determine, by a processing device of the host computer system, whether the physical address referenced by the request corresponds to the virtual address of the peripheral device;
• and
• responsive to determining that the physical address referenced by the request corresponds to the virtual address of the peripheral device, using the first data structure for address translation of the physical address referenced by the request to the host virtual address.

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

• run, by a host computer system, a hypervisor managing a first virtual machine;
• responsive to receipt of, by the hypervisor, a request to create a second virtual machine nested within the first virtual machine, initialize a first data structure for address translation of physical addresses of the second virtual machine corresponding to virtual addresses of a peripheral device, wherein the first data structure includes an offset based on a difference between a first starting address on a memory buffer associated with a host physical address and a second starting address on the memory buffer associated with a host virtual address that is based on an addition of the offset to a guest physical address of the first virtual machine;
• receive an identity of the peripheral device associated with the second virtual machine and at least one guest memory address allocated to the second virtual machine;
• receive, by the peripheral device, a request from the second virtual machine;
• determine whether a physical address referenced by the request corresponds to a virtual address of the peripheral device;
• and
• responsive to a determination that the physical address referenced by the request corresponds to the virtual address of the peripheral device, determine, by the processing device, based on the at least one guest memory address associated with the physical address referenced by the request, the host virtual address corresponding to the physical address of the second virtual machine, wherein the first data structure is utilized for address translation of the physical address referenced by the request to the host virtual address.