On Tue, Mar 23, 2021 at 11:02:28AM +1000, Nicholas Piggin wrote: > The code being executed in KVM_GUEST_MODE_SKIP is hypervisor code with > MSR[IR]=0, so the faults of concern are the d-side ones caused by access > to guest context by the hypervisor. > > Instruction breakpoint interrupts are not a concern here. It's unlikely > any good would come of causing breaks in this code, but skipping the > instruction that caused it won't help matters (e.g., skip the mtmsr that > sets MSR[DR]=0 or clears KVM_GUEST_MODE_SKIP). > > Reviewed-by: Daniel Axtens <dja@xxxxxxxxxx> > Reviewed-by: Fabiano Rosas <farosas@xxxxxxxxxxxxx> > Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx> It might be worth noting in the commit message that the 0x1300 interrupt was dropped from the architecture a long time ago and is not generated by P7, P8, P9 or P10. Acked-by: Paul Mackerras <paulus@xxxxxxxxxx>
