[Xen-devel] Re: [Qemu-devel] [PATCH 08/12] qemu_ram_ptr_length: take ram_addr_t as arguments

[Vasily Khoruzhick <anarsoul@xxxxxxxxx>]

On Tuesday 05 July 2011 19:51:09 Alexander Graf wrote:
> From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> 
> qemu_ram_ptr_length should take ram_addr_t as argument rather than
> target_phys_addr_t because is doing comparisons with RAMBlock addresses.
> 
> cpu_physical_memory_map should create a ram_addr_t address to pass to
> qemu_ram_ptr_length from PhysPageDesc phys_offset.
> 
> Remove code after abort() in qemu_ram_ptr_length.
> 
> Changes in v2:
> 
> - handle 0 size in qemu_ram_ptr_length;
> 
> - rename addr1 to raddr;
> 
> - initialize raddr to ULONG_MAX.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Reviewed-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
> Signed-off-by: Alexander Graf <agraf@xxxxxxx>

Tested-by: Vasily Khoruzhick <anarsoul@xxxxxxxxx>

> ---
>  cpu-common.h |    2 +-
>  exec.c       |   21 ++++++++++++++-------
>  2 files changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/cpu-common.h b/cpu-common.h
> index b027e43..e4fcded 100644
> --- a/cpu-common.h
> +++ b/cpu-common.h
> @@ -65,7 +65,7 @@ void qemu_ram_free_from_ptr(ram_addr_t addr);
>  void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
>  /* This should only be used for ram local to a device.  */
>  void *qemu_get_ram_ptr(ram_addr_t addr);
> -void *qemu_ram_ptr_length(target_phys_addr_t addr, target_phys_addr_t
> *size); +void *qemu_ram_ptr_length(ram_addr_t addr, ram_addr_t *size);
>  /* Same but slower, to use for migration, where the order of
>   * RAMBlocks must not change. */
>  void *qemu_safe_ram_ptr(ram_addr_t addr);
> diff --git a/exec.c b/exec.c
> index 5604946..c0673c2 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -3167,8 +3167,11 @@ void *qemu_safe_ram_ptr(ram_addr_t addr)
> 
>  /* Return a host pointer to guest's ram. Similar to qemu_get_ram_ptr
>   * but takes a size argument */
> -void *qemu_ram_ptr_length(target_phys_addr_t addr, target_phys_addr_t
> *size) +void *qemu_ram_ptr_length(ram_addr_t addr, ram_addr_t *size)
>  {
> +    if (*size == 0) {
> +        return NULL;
> +    }
>      if (xen_enabled()) {
>          return xen_map_cache(addr, *size, 1);
>      } else {
> @@ -3184,9 +3187,6 @@ void *qemu_ram_ptr_length(target_phys_addr_t addr,
> target_phys_addr_t *size)
> 
>          fprintf(stderr, "Bad ram offset %" PRIx64 "\n", (uint64_t)addr);
>          abort();
> -
> -        *size = 0;
> -        return NULL;
>      }
>  }
> 
> @@ -4052,7 +4052,9 @@ void *cpu_physical_memory_map(target_phys_addr_t
> addr, target_phys_addr_t page;
>      unsigned long pd;
>      PhysPageDesc *p;
> -    target_phys_addr_t addr1 = addr;
> +    ram_addr_t raddr = ULONG_MAX;
> +    ram_addr_t rlen;
> +    void *ret;
> 
>      while (len > 0) {
>          page = addr & TARGET_PAGE_MASK;
> @@ -4080,13 +4082,18 @@ void *cpu_physical_memory_map(target_phys_addr_t
> addr, *plen = l;
>              return bounce.buffer;
>          }
> +        if (!todo) {
> +            raddr = (pd & TARGET_PAGE_MASK) + (addr & ~TARGET_PAGE_MASK);
> +        }
> 
>          len -= l;
>          addr += l;
>          todo += l;
>      }
> -    *plen = todo;
> -    return qemu_ram_ptr_length(addr1, plen);
> +    rlen = todo;
> +    ret = qemu_ram_ptr_length(raddr, &rlen);
> +    *plen = rlen;
> +    return ret;
>  }
> 
>  /* Unmaps a memory region previously mapped by cpu_physical_memory_map().

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