Event notification support for nested virtual machines

A system, comprising:

• a memory;
• a processing device operatively coupled to the memory, the processing device configured to:
• run a Level 0 hypervisor managing a Level 1 virtual machine running a Level 1 hypervisor, wherein the Level 1 hypervisor manages a Level 2 virtual machine,
• generate, by the Level 1 hypervisor, a virtual device and an input/output (I/O) translation table comprising an I/O translation table entry associated with the virtual device, wherein the I/O translation table entry maps a Level 2 guest virtual address of a Level 2 address space associated with the Level 2 virtual machine to a corresponding Level 1 guest virtual address of a Level 1 address space associated with the Level 1 virtual machine;
• associate the I/O translation table entry with a Level 1 virtual machine context maintained by at least one of the Level 0 hypervisor or Level 1 hypervisor;
• and
• responsive to detecting, by the Level 0 hypervisor, an event notification from the Level 2 virtual machine, cause a central processing unit (CPU) to use the I/O translation table to execute access to the Level 1 guest virtual address.

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

• run a Level 0 hypervisor managing a Level 1 virtual machine running a Level 1 hypervisor, wherein the Level 1 hypervisor manages a Level 2 virtual machine,
• generate, by the Level 1 hypervisor, a virtual device and an input/output (I/O) translation table comprising an I/O translation table entry associated with the virtual device, wherein the I/O translation table entry maps a Level 2 guest virtual address of a Level 2 address space associated with the Level 2 virtual machine to a corresponding Level 1 guest virtual address of a Level 1 address space associated with the Level 1 virtual machine;
• associate the I/O translation table entry with a Level 1 virtual machine context maintained by at least one of the Level 0 hypervisor or Level 1 hypervisor;
• and
• responsive to detecting, by the Level 0 hypervisor, an event notification from the Level 2 virtual machine, cause a central processing unit (CPU) to use the I/O translation table to execute access to the Level 1 guest virtual address.