On Fri, 2024-03-15 at 10:23 +1300, Huang, Kai wrote: > We have 3 page tables as you mentioned: > > PT: page table > - Shared PT is visible to KVM and it is used by CPU. > - Private PT is used by CPU but it is invisible to KVM. > - Dummy PT is visible to KVM but not used by CPU. It is used to > propagate PT change to the actual private PT which is used by CPU. > > If I recall correctly, we used to call the last one "mirrored > (private) > page table". > > I lost the tracking when we changed to use "dummy page table", but it > seems to me "mirrored" is better than "dummy" because the latter > means > it is useless but in fact it is used to propagate changes to the real > private page table used by hardware. Mirrored makes sense to me. So like: Private - Table actually mapping private alias, in TDX module Shared - Shared alias table, visible in KVM Mirror - Mirroring private, visible in KVM > > Btw, one nit, perhaps: > > "Shared PT is visible to KVM and it is used by CPU." -> "Shared PT is > visible to KVM and it is used by CPU for shared mappings". > > To make it more clearer it is used for "shared mappings". > > But this may be unnecessary to others, so up to you. Yep, this seems clearer.
