[PATCH v4 10/29] arm64: enable the Permission Overlay Extension for EL0

[Dave Martin]

On Thu, Aug 01, 2024 at 05:04:03PM +0100, Joey Gouly wrote:
> On Thu, Jul 25, 2024 at 04:49:08PM +0100, Dave Martin wrote:
> > On Fri, May 03, 2024 at 02:01:28PM +0100, Joey Gouly wrote:
> > > Expose a HWCAP and ID_AA64MMFR3_EL1_S1POE to userspace, so they can be used to
> > > check if the CPU supports the feature.
> > > 
> > > Signed-off-by: Joey Gouly <joey.gouly at arm.com>
> > > Cc: Catalin Marinas <catalin.marinas at arm.com>
> > > Cc: Will Deacon <will at kernel.org>
> > > ---
> > > 
> > > This takes the last bit of HWCAP2, is this fine? What can we do about more features in the future?
> > > 
> > > 
> > >  Documentation/arch/arm64/elf_hwcaps.rst |  2 ++
> > >  arch/arm64/include/asm/hwcap.h          |  1 +
> > >  arch/arm64/include/uapi/asm/hwcap.h     |  1 +
> > >  arch/arm64/kernel/cpufeature.c          | 14 ++++++++++++++
> > >  arch/arm64/kernel/cpuinfo.c             |  1 +
> > >  5 files changed, 19 insertions(+)
> > > 
> > > diff --git a/Documentation/arch/arm64/elf_hwcaps.rst b/Documentation/arch/arm64/elf_hwcaps.rst
> > > index 448c1664879b..694f67fa07d1 100644
> > > --- a/Documentation/arch/arm64/elf_hwcaps.rst
> > > +++ b/Documentation/arch/arm64/elf_hwcaps.rst
> > > @@ -365,6 +365,8 @@ HWCAP2_SME_SF8DP2
> > >  HWCAP2_SME_SF8DP4
> > >      Functionality implied by ID_AA64SMFR0_EL1.SF8DP4 == 0b1.
> > >  
> > > +HWCAP2_POE
> > > +    Functionality implied by ID_AA64MMFR3_EL1.S1POE == 0b0001.
> > 
> > Nit: unintentionally dropped blank line before the section heading?
> 
> Now there's only one blank line, I think
> c1932cac7902a8b0f7355515917dedc5412eb15d unintentionally added 2 blank lines,
> before that it was always 1!

Hmmm, true.  Not a big deal, I guess.

Cheers
---Dave