ping Just to remind, this one is an important bugfix. It fixes host-guest tracing with the latest kernels, where new KVM debug info is exposed through the debugfs. On Fri, Dec 10, 2021 at 1:55 PM Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx> wrote: > > Guest's TSC fraction bits have sens only if there is TSC scaling. In > case of default value for TSC scaling, fraction bits should not be used > in TSC guest clock calculation. > > Fixes: https://lore.kernel.org/linux-trace-devel/20211014150204.2485499-3-tz.stoyanov@xxxxxxxxx/ > (trace-cmd library: Extend host-guest time sync with fraction bits) > > Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx> > --- > lib/trace-cmd/trace-timesync-kvm.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/lib/trace-cmd/trace-timesync-kvm.c b/lib/trace-cmd/trace-timesync-kvm.c > index 8d531922..12a22d4c 100644 > --- a/lib/trace-cmd/trace-timesync-kvm.c > +++ b/lib/trace-cmd/trace-timesync-kvm.c > @@ -415,7 +415,7 @@ static int kvm_clock_host(struct tracecmd_time_sync *tsync, > kvm_scaling = 1; > } > > - if (kvm->vcpu_frac && kvm->vcpu_frac[cpu]) > + if (kvm->vcpu_frac && kvm->vcpu_frac[cpu] && kvm_scaling != 1) > ret = read_ll_from_file(kvm->vcpu_frac[cpu], &kvm_frac); > msg = (char *)&packet; > size = sizeof(packet); > -- > 2.33.1 > -- Tzvetomir (Ceco) Stoyanov VMware Open Source Technology Center
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