[PATCH 0/2] Fix handling of h_set_dawr
Suraj Jitindar Singh
sjitindarsingh at gmail.com
Thu Jun 20 11:45:16 AEST 2019
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 at kaod.org>
>
> and
>
> Tested-by: Cédric Le Goater <clg at kaod.org>
>
>
> 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.
>
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