On Fri, 8 Sep 2017 15:44:54 -0700 Ram Pai <linux...@us.ibm.com> wrote:
> cleanup the bits corresponding to a key in the AMR, and IAMR > register, when the key is newly allocated/activated or is freed. > We dont want some residual bits cause the hardware enforce > unintended behavior when the key is activated or freed. > > Signed-off-by: Ram Pai <linux...@us.ibm.com> > --- > arch/powerpc/include/asm/pkeys.h | 12 ++++++++++++ > 1 files changed, 12 insertions(+), 0 deletions(-) > > diff --git a/arch/powerpc/include/asm/pkeys.h > b/arch/powerpc/include/asm/pkeys.h > index 5a83ed7..53bf13b 100644 > --- a/arch/powerpc/include/asm/pkeys.h > +++ b/arch/powerpc/include/asm/pkeys.h > @@ -54,6 +54,8 @@ static inline bool mm_pkey_is_allocated(struct mm_struct > *mm, int pkey) > mm_set_pkey_is_allocated(mm, pkey)); > } > > +extern void __arch_activate_pkey(int pkey); > +extern void __arch_deactivate_pkey(int pkey); > /* > * Returns a positive, 5-bit key on success, or -1 on failure. > */ > @@ -80,6 +82,12 @@ static inline int mm_pkey_alloc(struct mm_struct *mm) > > ret = ffz((u32)mm_pkey_allocation_map(mm)); > mm_set_pkey_allocated(mm, ret); > + > + /* > + * enable the key in the hardware > + */ > + if (ret > 0) > + __arch_activate_pkey(ret); > return ret; > } > > @@ -91,6 +99,10 @@ static inline int mm_pkey_free(struct mm_struct *mm, int > pkey) > if (!mm_pkey_is_allocated(mm, pkey)) > return -EINVAL; > > + /* > + * Disable the key in the hardware > + */ > + __arch_deactivate_pkey(pkey); > mm_set_pkey_free(mm, pkey); > > return 0; I think some of these patches can be merged, too much fine granularity is hurting my ability to see the larger function/implementation. Balbir Singh.
