On Tue, Feb 23, 2021, Jim Mattson wrote: > On Tue, Feb 23, 2021 at 2:51 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > > > On Fri, Feb 19, 2021, David Edmondson wrote: > > > If the VM entry/exit controls for loading/saving MSR_EFER are either > > > not available (an older processor or explicitly disabled) or not > > > used (host and guest values are the same), reading GUEST_IA32_EFER > > > from the VMCS returns an inaccurate value. > > > > > > Because of this, in dump_vmcs() don't use GUEST_IA32_EFER to decide > > > whether to print the PDPTRs - do so if the EPT is in use and CR4.PAE > > > is set. > > > > This isn't necessarily correct either. In a way, it's less correct as PDPTRs > > are more likely to be printed when they shouldn't, assuming most guests are > > 64-bit guests. It's annoying to calculate the effective guest EFER, but so > > awful that it's worth risking confusion over PDTPRs. > > I still prefer a dump_vmcs that always dumps every VMCS field. I'm a-ok with that approach.
