On Sat, Sep 15, 2012 at 04:34:36PM +0100, Christoffer Dall wrote:
> From: Marc Zyngier <marc.zyngier@xxxxxxx>
>
> The KVM hypervisor mmu code 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@xxxxxxx>
> Signed-off-by: Christoffer Dall <c.dall@xxxxxxxxxxxxxxxxxxxxxx>
> ---
> arch/arm/include/asm/mach/map.h | 1 +
> arch/arm/mm/mmu.c | 6 ++++++
> 2 files changed, 7 insertions(+)
>
> diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h
> index a6efcdd..3787c9f 100644
> --- a/arch/arm/include/asm/mach/map.h
> +++ b/arch/arm/include/asm/mach/map.h
> @@ -37,6 +37,7 @@ 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 4c2d045..76bf4f5 100644
> --- a/arch/arm/mm/mmu.c
> +++ b/arch/arm/mm/mmu.c
> @@ -301,6 +301,12 @@ 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);
> +
get_mem_type can return NULL, so you should probably pass the error through
rather than dereferencing it.
Will
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