Cache behavior for secure memory repartitioning systems

A method, comprising:

• receiving, by a processing device, a memory access request to a page in a memory device communicably coupled to the processing device, the memory access request comprising a first guarded attribute (GA) indicator indicating whether the page is a secure page belonging to an enclave;
• determining, by the processing device, whether the first GA indicator matches a second GA indicator in a cache line entry corresponding to the page, the cache line entry comprised in a cache;
• responsive to a determination that the first GA indicator matches the second GA indicator, returning first data in the cache line entry for the page;
• and
• responsive to a determination that the first GA indicator does not match the second GA indicator, applying, by the processing device, an eviction policy to the cache line entry based on whether the cache line is indicated as a dirty cache line and accessing second data in the memory device for the page.

An system comprising:

• a memory device to store pages;
• and
• a processing device operably coupled to the memory device, the processing device comprising a cache and a memory encryption engine, and the processing device to:
• receive a memory access request to a page in the memory device, the memory access request comprising a first guarded attribute (GA) indicator indicating whether the page is a secure page belonging to an enclave;
• determine whether the first GA indicator matches a second GA indicator in a cache line entry corresponding to the page, the cache line entry comprised in a cache;
• responsive to a determination that the first GA indicator matches the second GA indicator, return first data in the cache line entry for the page;
• and
• responsive to a determination that the first GA indicator does not match the second GA indicator, apply an eviction policy to the cache line entry based on whether the cache line is indicated as a dirty cache line and accessing second data in the memory device for the page.