On Mon, May 14, 2012 at 4:05 PM, Marc Zyngier <marc.zyngier at arm.com> wrote:
> The KVM hypervisor mmu code requires requires access to the
> mem_type prot_pte field when setting up page tables pointing
> to a device. Unfortunately, the mem_type structure is opaque.
>
> Add an accessor (get_mem_type_prot_pte()) to retrieve the
> prot_pte value.
>
> Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
> ---
> ?arch/arm/include/asm/mach/map.h | ? ?1 +
> ?arch/arm/mm/mmu.c ? ? ? ? ? ? ? | ? ?6 ++++++
> ?2 files changed, 7 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h
> index b36f365..9de40a7 100644
> --- a/arch/arm/include/asm/mach/map.h
> +++ b/arch/arm/include/asm/mach/map.h
> @@ -36,6 +36,7 @@ extern void iotable_init(struct map_desc *, int);
>
> ?struct mem_type;
> ?extern const struct mem_type *get_mem_type(unsigned int type);
> +extern pteval_t get_mem_type_prot_pte(unsigned int type);
> ?/*
> ?* external interface to remap single page with appropriate type
> ?*/
> diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
> index 825a8a2..26b3cda 100644
> --- a/arch/arm/mm/mmu.c
> +++ b/arch/arm/mm/mmu.c
> @@ -298,6 +298,12 @@ const struct mem_type *get_mem_type(unsigned int type)
> ?}
> ?EXPORT_SYMBOL(get_mem_type);
>
> +pteval_t get_mem_type_prot_pte(unsigned int type)
> +{
> + ? ? ? return get_mem_type(type)->prot_pte;
> +}
> +EXPORT_SYMBOL(get_mem_type_prot_pte);
> +
> ?/*
> ?* Adjust the PMD section entries according to the CPU in use.
> ?*/
> --
fine with me, I'll include it as a preparatory independent patch
before the KVM series.
-Christoffer
