Re: [Xen-devel] [PATCH v2 6/6] x86/viridian: implement the crash MSRs

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: 21 March 2017 15:42
> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> Cc: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>; Wei Liu
> <wei.liu2@xxxxxxxxxx>; Ian Jackson <Ian.Jackson@xxxxxxxxxx>; xen-
> devel@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH v2 6/6] x86/viridian: implement the crash MSRs
> 
> >>> On 20.03.17 at 18:08, <paul.durrant@xxxxxxxxxx> wrote:
> > @@ -619,6 +636,36 @@ int wrmsr_viridian_regs(uint32_t idx, uint64_t val)
> >              update_reference_tsc(d, 1);
> >          break;
> >
> > +    case HV_X64_MSR_CRASH_P0:
> > +    case HV_X64_MSR_CRASH_P1:
> > +    case HV_X64_MSR_CRASH_P2:
> > +    case HV_X64_MSR_CRASH_P3:
> > +    case HV_X64_MSR_CRASH_P4:
> > +        BUILD_BUG_ON(HV_X64_MSR_CRASH_P4 -
> HV_X64_MSR_CRASH_P0 >=
> > +                     ARRAY_SIZE(v->arch.hvm_vcpu.viridian.crash_param));
> > +
> > +        idx -= HV_X64_MSR_CRASH_P0;
> > +        v->arch.hvm_vcpu.viridian.crash_param[idx] = val;
> > +        break;
> > +
> > +    case HV_X64_MSR_CRASH_CTL:
> > +    {
> > +        HV_CRASH_CTL_REG_CONTENTS ctl;
> > +
> > +        ctl.AsUINT64 = val;
> > +
> > +        if ( !ctl.CrashNotify )
> > +            break;
> > +
> > +        gprintk(XENLOG_INFO, "VIRIDIAN CRASH: %lx %lx %lx %lx %lx\n",
> > +                v->arch.hvm_vcpu.viridian.crash_param[0],
> > +                v->arch.hvm_vcpu.viridian.crash_param[1],
> > +                v->arch.hvm_vcpu.viridian.crash_param[2],
> > +                v->arch.hvm_vcpu.viridian.crash_param[3],
> > +                v->arch.hvm_vcpu.viridian.crash_param[4]);
> 
> With default log level settings this message will go nowhere. If that's
> intended, I don't mind, but I think XENLOG_WARNING (or simply no
> log level) would be better here.

Oh, I thought INFO was on by default. Please change it to WARNING... it seems 
appropriate.

> 
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> Let me know whether you want me to make the adjustment while
> committing.
> 

Thanks but since I'm going to send a v3 anyway, I'll fix it.

  Paul

> Jan


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