Non-interrupting portable page request interface

A system, comprising:

• a memory;
• input/output memory management unit (IOMMU) coupled to the memory;
• and
• a processing device operatively coupled to the IOMMU, the processing device configured to:
• generate a first bit sequence;
• generate a second sequence by applying a predetermined transformation to the first bit sequence;
• write the second bit sequence to a memory buffer;
• read a first value from the memory buffer;
• write the first bit sequence to the memory buffer;
• read a second value from the memory buffer;
• and
• responsive to determining that the second value does not match the first value, associate a writable attribute with an IOMMU page table entry associated with the memory buffer.

A method comprising:

• running, by a host computer system, a hypervisor managing a virtual machine in communication with a peripheral device, wherein the peripheral device comprises an input/output memory management unit (IOMMU);
• appending, to a page table of the IOMMU, a plurality of records referencing present memory pages associated with a task running on the virtual machine;
• and
• appending, to the page table of the IOMMU, a plurality of records referencing read-only memory pages associated with the task, wherein the read-only memory pages are indicated as read-only in the page table.