On 21/06/2017 09:06, Ladi Prosek wrote: > On AMD hardware, Hyper-V doesn't work nested on KVM if L1 is started with > more than one vCPU. The problem is in NMI which is heavily used by Windows > on SMP systems. > > This series fixes a couple of related issues with the current NMI singlestep > logic and makes Windows with Hyper-V happy. > > v1->v2: > > * simplified patch 4 to call smp_send_reschedule instead of intercepting iret > (Paolo) > > * added patch 5 to suppress singlestep on GIF=0 and nested exit (Paolo) > > * dropped most of the cover letter blurb because we now singlestep only over > iret, as originally intended (Radim) > > * still left nmi_singlestep_guest_rflags and the defensive code accessing it > in -- it shouldn't be needed if we really singlestep only over iret but it > is more robust this way (Radim) > > * ran eventinj.flat, found no regression (baseline appears to be broken on > nested, I'll look into it separately) (Paolo) Queued, thanks! Paolo
