'Sharing a TLB entry between two logical CPUs (Intel)
I wondered if it is possible if two threads belonging to the same program with the same PCID can share the TLB entry when they are scheduled to run on the same physical CPU?
I already looked into the SDM (https://www.intel.com/content/www/us/en/developer/articles/technical/intel-sdm.html); page 3115 (TLB and HT) does not mention any sharing mechanism. But another part of the document states that before accessing the TLB entry, the PCID value is checked, and if it is equal, the value is used. However, there is also a bit for the current thread set next to the PCID identifier.
My question: is the PCID value used with priority over the CPU-thread bit or is it necessary that both values match?
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