On 02/06/20 02:11, Jim Mattson wrote: > I can only assume that no one cares that KVM_GET_SREGS/KVM_SET_SREGS > is broken for PAE mode guests (i.e. KVM_GET_SREGS doesn't capture the > PDPTRs and KVM_SET_SREGS re-reads them from memory). > > Presumably, since AMD's nested paging is broken for PAE mode guests, > the kvm community has made the decision not to get things right for > Intel either. Can anyone confirm? This was all before my time. Yes, pretty much. The PDPTRs are not part of the saved state, we just treat them as a small third level in the radix tree. Of course, for nested VMX they are properly synced to the VMCS12 and serialized by KVM_SET_NESTED_STATE. Out of curiosity are there OSes that rely on the PDPTRs remaining cached until the next CR3 load? Paolo
