* Benjamin Herrenschmidt (b...@kernel.crashing.org) wrote:
> On Fri, 2012-03-23 at 16:22 -0500, Robert Jennings wrote:
> > This patch changes the architecture vector to advertise support for a
> > lower minimum virtual processor entitled capacity. The default
> > minimum without this patch is 10%, this patch specifies 5%. This will
> > allow 20 LPARs per CPU rather than only 10.
>
> Any reason why we don't just put 1% in there and thus don't have to
> change again when pHyp decides to lower their minimum ? :-)
>
> (Can you test that it works, ie, that pHyp doesn't barf if we put 1% and
> properly uses 5% in that case ?)
Thanks Ben, makes good sense.
I'm in the process of validating this and I'll post reply or a new
version of the patch when I get it completed.
--Rob Jennings
> > Signed-off-by: Robert Jennings <r...@linux.vnet.ibm.com>
> > ---
> > arch/powerpc/kernel/prom_init.c | 8 ++++++--
> > 1 files changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/powerpc/kernel/prom_init.c
> > b/arch/powerpc/kernel/prom_init.c
> > index eca626e..3d882ea 100644
> > --- a/arch/powerpc/kernel/prom_init.c
> > +++ b/arch/powerpc/kernel/prom_init.c
> > @@ -689,6 +689,9 @@ static void __init early_cmdline_parse(void)
> > #define OV3_VMX 0x40 /* VMX/Altivec */
> > #define OV3_DFP 0x20 /* decimal FP */
> >
> > +/* Option vector 4: IBM PAPR implementation */
> > +#define OV4_MIN_ENT_CAP 0x05 /* minimum VP entitled capacity
> > */
> > +
> > /* Option vector 5: PAPR/OF options supported */
> > #define OV5_LPAR 0x80 /* logical partitioning supported */
> > #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
> > @@ -753,8 +756,9 @@ static unsigned char ibm_architecture_vec[] = {
> > OV3_FP | OV3_VMX | OV3_DFP,
> >
> > /* option vector 4: IBM PAPR implementation */
> > - 2 - 2, /* length */
> > + 3 - 2, /* length */
> > 0, /* don't halt */
> > + OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
> >
> > /* option vector 5: PAPR/OF options */
> > 13 - 2, /* length */
> > @@ -771,7 +775,7 @@ static unsigned char ibm_architecture_vec[] = {
> > * must match by the macro below. Update the definition if
> > * the structure layout changes.
> > */
> > -#define IBM_ARCH_VEC_NRCORES_OFFSET 100
> > +#define IBM_ARCH_VEC_NRCORES_OFFSET 101
> > W(NR_CPUS), /* number of cores supported */
> >
> > /* option vector 6: IBM PAPR hints */
>
>
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