On Mon, 2019-06-17 at 11:06 +0200, Cédric Le Goater wrote: > On 17/06/2019 09:16, Suraj Jitindar Singh wrote: > > Series contains 2 patches to fix the host in kernel handling of the > > hcall > > h_set_dawr. > > > > First patch from Michael Neuling is just a resend added here for > > clarity. > > > > Michael Neuling (1): > > KVM: PPC: Book3S HV: Fix r3 corruption in h_set_dabr() > > > > Suraj Jitindar Singh (1): > > KVM: PPC: Book3S HV: Only write DAWR[X] when handling h_set_dawr > > in > > real mode > > > > Reviewed-by: Cédric Le Goater <clg@xxxxxxxx> > > and > > Tested-by: Cédric Le Goater <clg@xxxxxxxx> > > > but I see slowdowns in nested as if the IPIs were not delivered. Have > we > touch this part in 5.2 ? Hi, I've seen the same and tracked it down to decrementer exceptions not being delivered when the guest is using large decrementer. I've got a patch I'm about to send so I'll CC you. Another option is to disable the large decrementer with: -machine pseries,cap-large-decr=false Thanks, Suraj > > Thanks, > > C. >
