Re: [Qemu-devel] [PATCH] dimm: Correct type of MemoryHotplugState->base

[Igor Mammedov <imammedo@redhat.com>]

On Thu, 21 Jan 2016 12:37:51 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> The 'base' field of MemoryHotplugState is ram_addr_t, which indicates that
> it exists in the abstract address space of RAM regions.
> 
> However, the actual usage of this field indicates that it is a concrete
> physical address (it's passed as an offset to memory_region_add_subgregion
> for example).
> 
> So, correct its type to 'hwaddr'.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>  include/hw/mem/pc-dimm.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> index d83bf30..218dfb0 100644
> --- a/include/hw/mem/pc-dimm.h
> +++ b/include/hw/mem/pc-dimm.h
> @@ -77,7 +77,7 @@ typedef struct PCDIMMDeviceClass {
>   * @mr: hotplug memory address space container
>   */
>  typedef struct MemoryHotplugState {
> -    ram_addr_t base;
> +    hwaddr base;
>      MemoryRegion mr;
>  } MemoryHotplugState;
>  

I agree with this fix but that's not the only place where
ram_addr_t needs to be replaced with hwaddr.
For example type of MachineState.[max]ram_size fields needs
to be changed as well. Because QEMU builds without CONFIG_XEN_BACKEND
on 32-bit hosts are broken since ram_addr_t is 32-bits there
while some targets assume and use it as 64-bit one.