Re: [Xen-devel] [PATCH v2 09/23] xen/arm: Introduce xen_ulong_t for unsigned long

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Aug 06, 2012 at 03:27:12PM +0100, Stefano Stabellini wrote:
> All the original Xen headers have xen_ulong_t as unsigned long type, however
> when they have been imported in Linux, xen_ulong_t has been replaced with
> unsigned long. That might work for x86 and ia64 but it does not for arm.
> Bring back xen_ulong_t and let each architecture define xen_ulong_t as they
> see fit.
> 
> Also explicitly size pointers (__DEFINE_GUEST_HANDLE) to 64 bit.

Looks ok to me.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> ---
>  arch/arm/include/asm/xen/interface.h  |    8 ++++++--
>  arch/ia64/include/asm/xen/interface.h |    1 +
>  arch/x86/include/asm/xen/interface.h  |    1 +
>  include/xen/interface/memory.h        |   12 ++++++------
>  include/xen/interface/physdev.h       |    4 ++--
>  include/xen/interface/version.h       |    2 +-
>  include/xen/interface/xen.h           |    6 +++---
>  7 files changed, 20 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/arm/include/asm/xen/interface.h 
> b/arch/arm/include/asm/xen/interface.h
> index f904dcc..1d3030c 100644
> --- a/arch/arm/include/asm/xen/interface.h
> +++ b/arch/arm/include/asm/xen/interface.h
> @@ -9,8 +9,11 @@
>  
>  #include <linux/types.h>
>  
> +#define uint64_aligned_t uint64_t __attribute__((aligned(8)))
> +
>  #define __DEFINE_GUEST_HANDLE(name, type) \
> -     typedef type * __guest_handle_ ## name
> +     typedef struct { union { type *p; uint64_aligned_t q; }; }  \
> +        __guest_handle_ ## name
>  
>  #define DEFINE_GUEST_HANDLE_STRUCT(name) \
>       __DEFINE_GUEST_HANDLE(name, struct name)
> @@ -21,13 +24,14 @@
>       do {                                            \
>               if (sizeof(hnd) == 8)                   \
>                       *(uint64_t *)&(hnd) = 0;        \
> -             (hnd) = val;                            \
> +             (hnd).p = val;                          \
>       } while (0)
>  
>  #ifndef __ASSEMBLY__
>  /* Explicitly size integers that represent pfns in the interface with
>   * Xen so that we can have one ABI that works for 32 and 64 bit guests. */
>  typedef uint64_t xen_pfn_t;
> +typedef uint64_t xen_ulong_t;
>  /* Guest handles for primitive C types. */
>  __DEFINE_GUEST_HANDLE(uchar, unsigned char);
>  __DEFINE_GUEST_HANDLE(uint,  unsigned int);
> diff --git a/arch/ia64/include/asm/xen/interface.h 
> b/arch/ia64/include/asm/xen/interface.h
> index 686464e..7c83445 100644
> --- a/arch/ia64/include/asm/xen/interface.h
> +++ b/arch/ia64/include/asm/xen/interface.h
> @@ -71,6 +71,7 @@
>   * with Xen so that we could have one ABI that works for 32 and 64 bit
>   * guests. */
>  typedef unsigned long xen_pfn_t;
> +typedef unsigned long xen_ulong_t;
>  /* Guest handles for primitive C types. */
>  __DEFINE_GUEST_HANDLE(uchar, unsigned char);
>  __DEFINE_GUEST_HANDLE(uint, unsigned int);
> diff --git a/arch/x86/include/asm/xen/interface.h 
> b/arch/x86/include/asm/xen/interface.h
> index 555f94d..28fc621 100644
> --- a/arch/x86/include/asm/xen/interface.h
> +++ b/arch/x86/include/asm/xen/interface.h
> @@ -51,6 +51,7 @@
>   * with Xen so that on ARM we can have one ABI that works for 32 and 64
>   * bit guests. */
>  typedef unsigned long xen_pfn_t;
> +typedef unsigned long xen_ulong_t;
>  /* Guest handles for primitive C types. */
>  __DEFINE_GUEST_HANDLE(uchar, unsigned char);
>  __DEFINE_GUEST_HANDLE(uint,  unsigned int);
> diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
> index abbbff0..b5c3098 100644
> --- a/include/xen/interface/memory.h
> +++ b/include/xen/interface/memory.h
> @@ -34,7 +34,7 @@ struct xen_memory_reservation {
>      GUEST_HANDLE(xen_pfn_t) extent_start;
>  
>      /* Number of extents, and size/alignment of each (2^extent_order pages). 
> */
> -    unsigned long  nr_extents;
> +    xen_ulong_t  nr_extents;
>      unsigned int   extent_order;
>  
>      /*
> @@ -92,7 +92,7 @@ struct xen_memory_exchange {
>       *     command will be non-zero.
>       *  5. THIS FIELD MUST BE INITIALISED TO ZERO BY THE CALLER!
>       */
> -    unsigned long nr_exchanged;
> +    xen_ulong_t nr_exchanged;
>  };
>  
>  DEFINE_GUEST_HANDLE_STRUCT(xen_memory_exchange);
> @@ -148,8 +148,8 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
>   */
>  #define XENMEM_machphys_mapping     12
>  struct xen_machphys_mapping {
> -    unsigned long v_start, v_end; /* Start and end virtual addresses.   */
> -    unsigned long max_mfn;        /* Maximum MFN that can be looked up. */
> +    xen_ulong_t v_start, v_end; /* Start and end virtual addresses.   */
> +    xen_ulong_t max_mfn;        /* Maximum MFN that can be looked up. */
>  };
>  DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t);
>  
> @@ -169,7 +169,7 @@ struct xen_add_to_physmap {
>      unsigned int space;
>  
>      /* Index into source mapping space. */
> -    unsigned long idx;
> +    xen_ulong_t idx;
>  
>      /* GPFN where the source mapping page should appear. */
>      xen_pfn_t gpfn;
> @@ -186,7 +186,7 @@ struct xen_translate_gpfn_list {
>      domid_t domid;
>  
>      /* Length of list. */
> -    unsigned long nr_gpfns;
> +    xen_ulong_t nr_gpfns;
>  
>      /* List of GPFNs to translate. */
>      GUEST_HANDLE(ulong) gpfn_list;
> diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h
> index 9ce788d..bc3ae14 100644
> --- a/include/xen/interface/physdev.h
> +++ b/include/xen/interface/physdev.h
> @@ -56,7 +56,7 @@ struct physdev_eoi {
>  #define PHYSDEVOP_pirq_eoi_gmfn_v2       28
>  struct physdev_pirq_eoi_gmfn {
>      /* IN */
> -    unsigned long gmfn;
> +    xen_ulong_t gmfn;
>  };
>  
>  /*
> @@ -108,7 +108,7 @@ struct physdev_set_iobitmap {
>  #define PHYSDEVOP_apic_write          9
>  struct physdev_apic {
>       /* IN */
> -     unsigned long apic_physbase;
> +     xen_ulong_t apic_physbase;
>       uint32_t reg;
>       /* IN or OUT */
>       uint32_t value;
> diff --git a/include/xen/interface/version.h b/include/xen/interface/version.h
> index e8b6519..30280c9 100644
> --- a/include/xen/interface/version.h
> +++ b/include/xen/interface/version.h
> @@ -45,7 +45,7 @@ struct xen_changeset_info {
>  
>  #define XENVER_platform_parameters 5
>  struct xen_platform_parameters {
> -    unsigned long virt_start;
> +    xen_ulong_t virt_start;
>  };
>  
>  #define XENVER_get_features 6
> diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
> index 42834a3..ec32115 100644
> --- a/include/xen/interface/xen.h
> +++ b/include/xen/interface/xen.h
> @@ -274,9 +274,9 @@ DEFINE_GUEST_HANDLE_STRUCT(mmu_update);
>   * NB. The fields are natural register size for this architecture.
>   */
>  struct multicall_entry {
> -    unsigned long op;
> -    long result;
> -    unsigned long args[6];
> +    xen_ulong_t op;
> +    xen_ulong_t result;
> +    xen_ulong_t args[6];
>  };
>  DEFINE_GUEST_HANDLE_STRUCT(multicall_entry);
>  
> -- 
> 1.7.2.5

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