You can share a cache on a physical CPU without having shared address space. KVM virtual machines making use of Extended Page Tables or Nested Page Tables do n

You can share a cache on a physical CPU without having shared address space. KVM virtual machines making use of Extended Page Tables or Nested Page Tables do not share an address space with their host or other guests, however, they are susceptible to Spectre v2, for example. (This was the PZ PoC for variant 2)