[Qemu-devel] Re: [patch uq/master 5/8] Export qemu_ram_addr_from_host

[Anthony Liguori <anthony@codemonkey.ws>]

On 10/04/2010 01:54 PM, Marcelo Tosatti wrote:
> To be used by next patches.
>
> Signed-off-by: Marcelo Tosatti<mtosatti@redhat.com>
>
> Index: qemu/cpu-common.h
> ===================================================================
> --- qemu.orig/cpu-common.h
> +++ qemu/cpu-common.h
> @@ -47,6 +47,7 @@ void qemu_ram_free(ram_addr_t addr);
>   /* This should only be used for ram local to a device.  */
>   void *qemu_get_ram_ptr(ram_addr_t addr);
>   /* This should not be used by devices.  */
> +int do_qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr);
>    

This is not a great name for a function.  A better way to do this would 
be to make the existing qemu_ram_addr_from_host() -> 
qemu_ram_addr_from_host_nofail().

Regards,

Anthony Liguori

>   ram_addr_t qemu_ram_addr_from_host(void *ptr);
>
>   int cpu_register_io_memory(CPUReadMemoryFunc * const *mem_read,
> Index: qemu/exec.c
> ===================================================================
> --- qemu.orig/exec.c
> +++ qemu/exec.c
> @@ -2938,23 +2938,31 @@ void *qemu_get_ram_ptr(ram_addr_t addr)
>       return NULL;
>   }
>
> -/* Some of the softmmu routines need to translate from a host pointer
> -   (typically a TLB entry) back to a ram offset.  */
> -ram_addr_t qemu_ram_addr_from_host(void *ptr)
> +int do_qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr)
>   {
>       RAMBlock *block;
>       uint8_t *host = ptr;
>
>       QLIST_FOREACH(block,&ram_list.blocks, next) {
>           if (host - block->host<  block->length) {
> -            return block->offset + (host - block->host);
> +            *ram_addr = block->offset + (host - block->host);
> +            return 0;
>           }
>       }
> +    return -1;
> +}
>
> -    fprintf(stderr, "Bad ram pointer %p\n", ptr);
> -    abort();
> +/* Some of the softmmu routines need to translate from a host pointer
> +   (typically a TLB entry) back to a ram offset.  */
> +ram_addr_t qemu_ram_addr_from_host(void *ptr)
> +{
> +    ram_addr_t ram_addr;
>
> -    return 0;
> +    if (do_qemu_ram_addr_from_host(ptr,&ram_addr)) {
> +        fprintf(stderr, "Bad ram pointer %p\n", ptr);
> +        abort();
> +    }
> +    return ram_addr;
>   }
>
>   static uint32_t unassigned_mem_readb(void *opaque, target_phys_addr_t addr)
>
>
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