On Tue, Mar 09, 2021, Jim Mattson wrote: > On Tue, Mar 9, 2021 at 9:10 AM Sean Christopherson <seanjc@xxxxxxxxxx> > wrote: > > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > > index 50810d471462..32cf8287d4a7 100644 > > --- a/arch/x86/kvm/vmx/vmx.c > > +++ b/arch/x86/kvm/vmx/vmx.c > > @@ -6580,8 +6580,8 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx > > *vmx) > > int i, nr_msrs; > > struct perf_guest_switch_msr *msrs; > > > > + /* Note, nr_msrs may be garbage if perf_guest_get_msrs() returns > > NULL. */ > > > > You could drop the scary comment with a profligate initialization of > nr_msrs to 0. Yeah, I considered that as well. I opted for the scary comment because I wanted to dissuade future patches from modifying this code without taking into account the non-obvious behavior.
