Implementations disclosed describe a system and a method to execute a virtual machine on a processing device, receive a request to access a memory page identified by a guest virtual memory address (GVA) in an address space of the virtual machine, translate the GVA to a guest physical memory address (GPA) using a guest page table (GPT) comprising a GPT entry mapping the GVA to the GPA, translate the GPA to a host physical address (HPA) of the memory page, store, in a translation lookaside buffer (TLB), a TLB entry mapping the GVA to the HPA, modify the GPT entry to designate the memory page as accessed, detect an attempt by an application to modify the GPT entry; generate, in response to the attempt to modify the GPT entry, a page fault; and flush, in response to the page fault, the TLB entry.

Examples of the present disclosure provide apparatuses and methods related to a translation lookaside buffer in memory. An example method comprises receiving a command including a virtual address from a host translating the virtual address to a physical address on volatile memory of a memory device using a translation lookaside buffer (TLB).

A method, computer program product, and computer system are disclosed that in one or more embodiments includes issuing, from an issuing processor in the computer system, an address translation invalidation instruction with a return marker, wherein the address translation invalidation instruction is to invalidate one or more address translation entries in one or more storage locations in the computer system and wherein the return marker comprises an instruction to return information to the issuing processor indicating the identity of each processor where an invalidated entry was located. The method, product, and system in an embodiment further includes broadcasting the address translation invalidation instruction with the return marker to one or more storage locations of one or more of the processors in the computer system other than the issuing processor; invalidating the address translation entry corresponding to the broadcasted address translation invalidation instruction; and returning to the issuing processor information on each storage location corresponding to the invalidated address translation entry. In one or more embodiments, the returned information is used to determine the performance of the computing system, identifying the storage locations where data was located.

A processor core, a processor, an apparatus, and a method are disclosed. The processor core is coupled to a translation lookaside buffer and a first memory. The processor core further includes a memory processing module that includes: an instruction processing unit, adapted to identify a virtual memory operation instruction and send the virtual memory operation instruction to a bus request transceiver module; the bus request transceiver module, adapted to send the virtual memory operation instruction to an external interconnection unit; a forwarding request transceiver unit, adapted to receive the virtual memory operation instruction broadcast by the interconnection unit and send the virtual memory operation instruction to the virtual memory operation unit; and the virtual memory operation unit, adapted to perform a virtual memory operation according to the virtual memory operation instruction. An initiation core sends the virtual memory operation instruction to the interconnection unit. The interconnection unit determines, based on an operation address, to broadcast the virtual memory operation instruction to at least one of a plurality of processor cores, so that all the cores can process the virtual memory operation instruction using the same hardware logic, thereby reducing hardware logic of the processor core.

Embodiments described herein provide a scalable coherency tracking implementation that utilizes shared virtual memory to manage data coherency. In one embodiment, coherency tracking granularity is reduced relative to existing coherency tracking solutions, with coherency tracking storage memory moved to memory as a page table metadata. For example and in one embodiment, storage for coherency state is moved from dedicated hardware blocks to system memory, effectively providing a directory structure that is limitless in size.

Facilitating page table entry (PTE) maintenance in processor-based devices is disclosed. In this regard, a processor-based device includes processing elements (PEs) configured to support two new coherence states: walker-readable (W) and modified walker accessible (M.sub.W). The W coherence state indicates that read access to a corresponding coherence granule by hardware table walkers (HTWs) is permitted, but all write operations and all read operations by non-HTW agents are disallowed. The M.sub.W coherence state indicates that cached copies of the coherence granule visible only to HTWs may exist in other caches. In some embodiments, each PE is also configured to support a special page table entry (SP-PTE) field store instruction for modifying SP-PTE fields of a PTE, indicating to the PE's local cache that the corresponding coherence granule should transition to the M.sub.W state, and indicating to remote local caches that copies of the coherence granule should update their coherence state.

Examples of the present disclosure provide apparatuses and methods related to a translation lookaside buffer in memory. An example method comprises receiving a command including a virtual address from a host translating the virtual address to a physical address on volatile memory of a memory device using a translation lookaside buffer (TLB).

An apparatus comprises processing circuitry to process data access operations specifying a virtual address of data to be loaded from or stored to a data store, and proxy identifier determining circuitry to determine a proxy identifier for a data access operation to be processed by the data access circuitry, the proxy identifier having fewer bits than a physical address corresponding to the virtual address specified by the data access operation. The processing circuitry comprises at least one buffer to buffer information (including the proxy identifier) associated with one or more pending data access operations awaiting processing. Address translation circuitry determines the physical address corresponding to the virtual address specified for a data access operation after that data access operation has progressed beyond said at least one buffer.

One disclosed embodiment includes a method for memory management. The method includes receiving a first request to clear one or more entries of a translation lookaside buffer (TLB), receiving a second request to clear one or more entries of the TLB, bundling the first request with the second request, determining that a processor associated with the TLB transitioned to an inactive mode, and dropping the bundled first and second requests based on the determination.

A system for generating predictions for a hardware table walk to find a map of a given virtual address to a corresponding physical address is disclosed. The system includes a plurality of memories, which each includes respective plurality of entries, each of which includes a prediction of a particular one of a plurality of buffers which includes a portion of a virtual to physical address translation map. A first circuit may generate a plurality of hash values to retrieve a plurality of predictions from the plurality of memories, where each has value depends on a respective address and information associated with a respective thread. A second circuit may select a particular prediction of the retrieved predictions to use based on a history of previous predictions.