On Wed, Aug 23, 2023 at 3:20 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > I don't anticipate anything beyond the memory fault case. We essentially already > treat incomplete exits to userspace as KVM bugs. MMIO is the only other case I > can think of where KVM doesn't complete an exit to usersapce, but that one is > essentially getting grandfathered in because of x86's flawed MMIO handling. > Userspace memory faults also get grandfathered in because of paravirt ABIs, i.e. > KVM is effectively required to ignore some faults due to external forces. Well that's good to hear. Are you sure that we don't want to add even just a dedicated u8 to indicate the speculative exit reason though? I'm just thinking that the different structs in speculative_exit will be mutually exclusive, whereas flags/bitfields usually indicate non-mutually exclusive conditions.
