Re: [PATCH v2 1/2] s390/setup: set control program code via diag 318

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On Thu, 24 Jan 2019 09:32:36 +0100
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:

> On 06.12.2018 23:30, Collin Walling wrote:
> > The s390x diagnose 318 instruction sets the control program name code (CPNC)
> > and control program version code (CPVC) to provide useful information
> > regarding the OS during debugging. The CPNC is explicitly set to 4 to
> > indicate a Linux/KVM environment.
> > 
> > The CPVC is a 7-byte value containing:  
> [...]
> >  /*
> > + * Issue diagnose 318 to set the control program name and
> > + * version codes.
> > + */
> > +static void __init setup_control_program_code(void)
> > +{
> > +	union diag318_info diag318_info = {
> > +		.cpnc = CPNC_LINUX,
> > +		.cpvc_linux = LINUX_VERSION_CODE,
> > +		.cpvc_distro = {0},
> > +	};  
> 
> As we still discuss the encoding of the structure, I would like to set
> cpvc_linux to 0 when applying the patch. We can then settle the detailed
> structure later on.

So, setting cpvc_linux to something != 0 would indicate that
cpvc_distro is meaningful? Makes sense, I guess.

> 
> Ok?
> 




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