linux-kernel - Re: [PATCH 3/3] KVM: PPC: Book3S: Add support for hwrng found on some powernv systems

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Date:	Tue, 1 Oct 2013 18:36:15 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, tytso@....edu,
	herbert@...dor.apana.org.au, gleb@...hat.com, agraf@...e.de,
	kvm-ppc@...r.kernel.org, linuxppc-dev@...abs.org,
	Paul Mackerras <paulus@...ba.org>, kvm@...r.kernel.org,
	mpm@...enic.com, pbonzini@...hat.com
Subject: Re: [PATCH 3/3] KVM: PPC: Book3S: Add support for hwrng found on
 some powernv systems

On Fri, Sep 27, 2013 at 07:45:45PM +0530, Anshuman Khandual wrote:
> On 09/26/2013 12:01 PM, Michael Ellerman wrote:
> > +int powernv_hwrng_present(void)
> > +{
> > +	return __raw_get_cpu_var(powernv_rng) != NULL;
> > +}
> > +
> >  static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val)
> >  {
> >  	unsigned long parity;
> > @@ -42,6 +48,17 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val)
> >  	return val;
> >  }
> > 
> > +int powernv_get_random_real_mode(unsigned long *v)
> > +{
> > +	struct powernv_rng *rng;
> > +
> > +	rng = __raw_get_cpu_var(powernv_rng);
> > +
> > +	*v = rng_whiten(rng, in_rm64(rng->regs_real));
> > +
> 
> Will it be in_be64() instead of in_rm64() ? Its failing the build here. Except this
> all individual patches build correctly.

No it's definitely not in_be64() - that will checkstop your machine :)

I added in_rm64() in a previous patch, "Add real mode cache inhibited
IO accessors" - I just didn't want to spam the KVM guys with those
patches as well.

Thanks for the review & testing.

cheers
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