Host Address Space Identifier For Non-Uniform Memory Access Locality In Virtual Machines

An apparatus, comprising:

• a memory;
• and
• a processing device communicably coupled to the memory, the processing device to:
• determine, by a guest executed by a processing device and managed by a hypervisor, that a memory page of the guest should be moved from a first virtual non-uniform memory access (NUMA) node of the guest to a second virtual NUMA node of the guest;
• update, by the guest in a guest page table, a guest physical address (GPA) of the memory page to include a host address space identifier (HASID) of the second virtual NUMA node;
• attempting to access the updated GPA;
• and
• responsive to a page fault resulting from attempting to access the updated GPA, exiting from the guest to the hypervisor.

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

• receive, at a hypervisor executed by the processing device, execution control from a virtual machine (VM) managed by the hypervisor, wherein a page fault corresponding to a guest physical address (GPA) triggered an exit to the hypervisor from the VM;
• decode, by the hypervisor, the GPA to identify a host address space identifier (HASID) located in upper bits of the GPA;
• determine, by the hypervisor in view of the HASID, whether to migrate a memory page associated with the GPA;
• and
• create, by the hypervisor, a new page table entry for the GPA in a host page table of the hypervisor.