On Tue, Aug 1, 2017 at 10:57 PM, Segher Boessenkool
wrote:
> On Mon, Jul 31, 2017 at 07:10:15PM +1000, Michael Ellerman wrote:
>> And ___PPC_RA() is not quite right. The L field is only 2 bits wide, not
>> the 5 that ___PPC_RA() allows.
>>
>> We don't have a __PPC_L() macro, because L fields vary
On Mon, Jul 31, 2017 at 07:10:15PM +1000, Michael Ellerman wrote:
> And ___PPC_RA() is not quite right. The L field is only 2 bits wide, not
> the 5 that ___PPC_RA() allows.
>
> We don't have a __PPC_L() macro, because L fields vary in size and
> location. So I think you're best of open coding it,
Hi Matt,
A few comments inline ...
Matt Brown writes:
> Currently ppc_md.get_random_seed uses the powernv_get_random_long function.
> A guest calling this function would have to go through the hypervisor. The
This is not quite right. The powernv routine is only ever used on bare
metal. In a gue
Matt Brown writes:
> On Tue, Jul 11, 2017 at 7:34 PM, Daniel Axtens wrote:
>>> @@ -67,6 +69,21 @@ int powernv_get_random_real_mode(unsigned long *v)
>>> return 1;
>>> }
>>>
>>> +int powernv_get_random_darn(unsigned long *v)
>>
>> This is only referenced in this file so it should probably b
On Tue, Jul 11, 2017 at 7:34 PM, Daniel Axtens wrote:
> Hi Matt,
>
>> Currently ppc_md.get_random_seed uses the powernv_get_random_long function.
>> A guest calling this function would have to go through the hypervisor. The
>> 'darn' instruction, introduced in POWER9, allows us to bypass this by
>
Hi Matt,
> Currently ppc_md.get_random_seed uses the powernv_get_random_long function.
> A guest calling this function would have to go through the hypervisor. The
> 'darn' instruction, introduced in POWER9, allows us to bypass this by
> directly obtaining a value from the mmio region.
>
> This pa
Currently ppc_md.get_random_seed uses the powernv_get_random_long function.
A guest calling this function would have to go through the hypervisor. The
'darn' instruction, introduced in POWER9, allows us to bypass this by
directly obtaining a value from the mmio region.
This patch adds a function f
