From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH 2/6] xen/arm: implement get_maximum_gpfn
	hypercall
Date: Thu, 10 Apr 2014 18:28:01 +0100
Message-ID: <5346D4A1.5030909@citrix.com>
References: <1397148539-19084-1-git-send-email-w1.huang@samsung.com>
	<1397148539-19084-3-git-send-email-w1.huang@samsung.com>
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To: Wei Huang <w1.huang@samsung.com>
Cc: ian.campbell@citrix.com, stefano.stabellini@eu.citrix.com, julien.grall@linaro.org, jaeyong.yoo@samsung.com, xen-devel@lists.xen.org, yjhyun.yoo@samsung.com
List-Id: xen-devel@lists.xenproject.org

On 10/04/14 17:48, Wei Huang wrote:
> From: Jaeyong Yoo <jaeyong.yoo@samsung.com>
>
> This patchi implements get_maximum_gpfn by using the memory map
> info in arch_domain (from set_memory_map hypercall).
>
> Signed-off-by: Evgeny Fedotov <e.fedotov@samsung.com>

Common implementation and a specific arch_get_maximum_gpfn() ?

~Andrew

> ---
>  xen/arch/arm/mm.c        | 19 ++++++++++++++++++-
>  xen/include/asm-arm/mm.h |  2 ++
>  2 files changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
> index 362bc8d..14b4686 100644
> --- a/xen/arch/arm/mm.c
> +++ b/xen/arch/arm/mm.c
> @@ -947,7 +947,11 @@ int page_is_ram_type(unsigned long mfn, unsigned long mem_type)
>  
>  unsigned long domain_get_maximum_gpfn(struct domain *d)
>  {
> -    return -ENOSYS;
> +    paddr_t end;
> +
> +    get_gma_start_end(d, NULL, &end);
> +
> +    return (unsigned long) (end >> PAGE_SHIFT);
>  }
>  
>  void share_xen_page_with_guest(struct page_info *page,
> @@ -1235,6 +1239,19 @@ int is_iomem_page(unsigned long mfn)
>          return 1;
>      return 0;
>  }
> +
> +/*
> + * Return start and end addresses of guest
> + */
> +void get_gma_start_end(struct domain *d, paddr_t *start, paddr_t *end)
> +{
> +    if ( start )
> +        *start = GUEST_RAM_BASE;
> +
> +    if ( end )
> +        *end = GUEST_RAM_BASE + ((paddr_t) d->max_pages << PAGE_SHIFT);
> +}
> +
>  /*
>   * Local variables:
>   * mode: C
> diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
> index b8d4e7d..341493a 100644
> --- a/xen/include/asm-arm/mm.h
> +++ b/xen/include/asm-arm/mm.h
> @@ -341,6 +341,8 @@ static inline void put_page_and_type(struct page_info *page)
>      put_page(page);
>  }
>  
> +void get_gma_start_end(struct domain *d, paddr_t *start, paddr_t *end);
> +
>  #endif /*  __ARCH_ARM_MM__ */
>  /*
>   * Local variables: