On Sat, Dec 11, 2021, Paolo Bonzini wrote: > On 12/11/21 07:56, Maxim Levitsky wrote: > > > This apparently wasn't validated against a simple use case, let > > > alone against things like migration with nested VMs, multliple L2s, > > > etc... > > > > I did validate the *SREGS2* against all the cases I could (like > > migration, EPT/NPT disabled/etc. I even started testing SMM to see > > how it affects PDPTRs, and patched seabios to use PAE paging. I still > > could have missed something. > > Don't worry, I think Sean was talking about patch 16 and specifically > digging at me (who deserved it completely). Yes, patch 16. My goal wasn't to dig at anyone, I just wanted to dramatically emphasize how ridiculousy fragile and complex the PDPTR crud is due to the number of edge cases.
