Re: [Xen-devel] [PATCH] xen: arm: implement domain_page_map_to_mfn

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 28 Jan 2013, Ian Campbell wrote:
> This was recently (re?)introduced on x86 in 26447:f831d8dcf18f and is
> now used in generic code (specifically tmem in 26454:38847c15d8cd).
> 
> This fixes the build on ARM.
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Cc: Jan Beulich <JBeulich@xxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Cc: Tim Deegan <tim@xxxxxxx>


Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

>  xen/arch/arm/mm.c |   12 ++++++++++++
>  1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
> index 9c5c334..7621d1b 100644
> --- a/xen/arch/arm/mm.c
> +++ b/xen/arch/arm/mm.c
> @@ -208,6 +208,18 @@ void unmap_domain_page(const void *va)
>      local_irq_restore(flags);
>  }
>  
> +unsigned long domain_page_map_to_mfn(const void *va)
> +{
> +    lpae_t *map = xen_second + second_linear_offset(DOMHEAP_VIRT_START);
> +    int slot = ((unsigned long) va - DOMHEAP_VIRT_START) >> SECOND_SHIFT;
> +    unsigned long offset = ((unsigned long)va>>THIRD_SHIFT) & 
> LPAE_ENTRY_MASK;
> +
> +    ASSERT(slot >= 0 && slot < DOMHEAP_ENTRIES);
> +    ASSERT(map[slot].pt.avail != 0);
> +
> +    return map[slot].pt.base + offset;
> +}
> +
>  void __init arch_init_memory(void)
>  {
>      /*
> -- 
> 1.7.9.1
> 

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