Re: [Qemu-devel] [PATCH v7 3/6] target/ppc: Handle NMI guest exit

[David Gibson]

On Thu, Apr 04, 2019 at 02:40:45PM +0530, Aravinda Prasad wrote:
> 
> 
> On Monday 25 March 2019 11:52 AM, David Gibson wrote:
> > On Fri, Mar 22, 2019 at 12:03:58PM +0530, Aravinda Prasad wrote:
> >> Memory error such as bit flips that cannot be corrected
> >> by hardware are passed on to the kernel for handling.
> >> If the memory address in error belongs to guest then
> >> the guest kernel is responsible for taking suitable action.
> >> Patch [1] enhances KVM to exit guest with exit reason
> >> set to KVM_EXIT_NMI in such cases. This patch handles
> >> KVM_EXIT_NMI exit.
> >>
> >> [1] https://www.spinics.net/lists/kvm-ppc/msg12637.html
> >>     (e20bbd3d and related commits)
> >>
> >> Signed-off-by: Aravinda Prasad <address@hidden>
> >> ---
> >>  hw/ppc/spapr_events.c  |   22 ++++++++++++++++++++++
> >>  include/hw/ppc/spapr.h |    1 +
> >>  target/ppc/kvm.c       |   16 ++++++++++++++++
> >>  target/ppc/kvm_ppc.h   |    2 ++
> >>  4 files changed, 41 insertions(+)
> >>
> 
> [...]
> 
> >> diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
> >> index 2427c8e..a593448 100644
> >> --- a/target/ppc/kvm.c
> >> +++ b/target/ppc/kvm.c
> >> @@ -1738,6 +1738,11 @@ int kvm_arch_handle_exit(CPUState *cs, struct 
> >> kvm_run *run)
> >>          ret = 0;
> >>          break;
> >>  
> >> +    case KVM_EXIT_NMI:
> >> +        DPRINTF("handle NMI exception\n");
> > 
> > tracepoints are generally preferred to new DPRINTFs.
> 
> I see DPRINTFs used in all other exit reasons in this function. Do you
> want me to change this particular exit case to tracepoints? I think it
> is better to keep this DPRINTF as of now and change all the DPRINTFs to
> tracepoints in a separate patch set.

Ah, good point.  Tracepoints are generally preferred, but since
DPRINTFs are in use here, stick with that (at some point it would be
good to change the whole file, but that's out of scope here).

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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