Exit-less movement of guest memory assigned to a device in a virtualized environment

A system comprising:

• a memory;
• a processing device, operatively coupled to the memory, to:
• detect an instruction for triggering a move or copy of a memory page residing at a first memory location that is mapped to a virtual address space of a virtual machine being hosted by a host computer system;
• un-map the first memory location from the virtual address space of the virtual machine;
• responsive to determining that a direct memory access (DMA) write indicator associated with a hardware device assigned to the virtual machine is set indicating that a DMA write operation is in progress, defer the move or copy of the memory page from the first memory location to a second memory location until an occurrence of a triggering event;
• and
• map, for use by an input/output memory management unit (IOMMU), the second memory location to the virtual address space of the virtual machine.

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

• detect, by the processing device, an instruction for triggering a move or copy of a memory page residing at a first memory location that is mapped to a virtual address space of a virtual machine being hosted by a host computer system;
• un-map the first memory location from the virtual address space of the virtual machine;
• responsive to determining that a direct memory access (DMA) write indicator associated with a hardware device assigned to the virtual machine is set indicating that a DMA write operation is in progress, defer the move or copy of the memory page from the first memory location to a second memory location until an occurrence of a triggering event;
• and
• map, for use by an input/output memory management unit (IOMMU), the second memory location to the virtual address space of the virtual machine.