Re: [Qemu-devel] [PATCH] s390x/kvm: add tracepoint to ioeventfd interface

[Cornelia Huck <cohuck@redhat.com>]

On Tue, 12 Feb 2019 16:52:09 +0100
Philippe Mathieu-Daudé <philmd@redhat.com> wrote:

> Hi Cornelia,
> 
> On 2/12/19 4:30 PM, Cornelia Huck wrote:
> > Trace when assigning/unassigning.
> > 
> > Signed-off-by: Cornelia Huck <cohuck@redhat.com>
> > ---
> >  target/s390x/kvm.c        | 2 ++
> >  target/s390x/trace-events | 1 +
> >  2 files changed, 3 insertions(+)
> > 
> > diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
> > index 15fdc168e1c5..7d61bd109092 100644
> > --- a/target/s390x/kvm.c
> > +++ b/target/s390x/kvm.c
> > @@ -1886,6 +1886,8 @@ int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch,
> >          .addr = sch,
> >          .len = 8,
> >      };
> > +    trace_kvm_s390_assign_subch_ioeventfd(kick.fd, kick.addr, assign,
> > +                                          kick.datamatch);
> >      if (!kvm_check_extension(kvm_state, KVM_CAP_IOEVENTFD)) {
> >          return -ENOSYS;
> >      }
> > diff --git a/target/s390x/trace-events b/target/s390x/trace-events
> > index a84e316e4937..bdc22f42cdbb 100644
> > --- a/target/s390x/trace-events
> > +++ b/target/s390x/trace-events
> > @@ -14,6 +14,7 @@ ioinst_chsc_cmd(uint16_t cmd, uint16_t len) "IOINST: chsc command 0x%04x, len 0x
> >  kvm_enable_cmma(int rc) "CMMA: enabling with result code %d"
> >  kvm_clear_cmma(int rc) "CMMA: clearing with result code %d"
> >  kvm_failed_cpu_state_set(int cpu_index, uint8_t state, const char *msg) "Warning: Unable to set cpu %d state %" PRIu8 " to KVM: %s"
> > +kvm_s390_assign_subch_ioeventfd(int fd, uint32_t addr, bool assign, int datamatch) "fd: %d sch: @0x%x assign: %d vq: %d"  
> 
> I noticed all s390x related trace events don't specify 's390' in the
> event name, maybe you can simply strip it. If you agree, feel free to
> apply that change directly yourself, no need for v2 ;)

Yeah; not exactly sure why the other events do that, though... I can
strip it if others agree.

> 
> Regardless the name used:
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Thanks!

> 
> >  
> >  # target/s390x/cpu.c
> >  cpu_set_state(int cpu_index, uint8_t state) "setting cpu %d state to %" PRIu8
> >