Re: [Qemu-devel] [PATCH] fix warnings on i386 build

[Anthony Liguori]

Glauber Costa wrote:
> i386 builds of kvm shouts warnings about type mismatches
> this patch fixes them.
>
> Signed-off-by: Glauber Costa <address@hidden>
> ---
>  kvm-all.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kvm-all.c b/kvm-all.c
> index 18e9361..d3fcf8b 100644
> --- a/kvm-all.c
> +++ b/kvm-all.c
> @@ -338,7 +338,7 @@ void kvm_set_phys_mem(target_phys_addr_t start_addr,
>  
>              /* Not splitting */
>              if ((phys_offset - (start_addr - mem->guest_phys_addr)) == 
> -                ((uint8_t *)mem->userspace_addr - phys_ram_base))
> +                (mem->userspace_addr - (ram_addr_t)phys_ram_base))
>   

This isn't quite right.  There's no reason ram_addr_t has to be 64-bit.  
If it were 32-bit, this would break badly.

I think a better fix is:

(ram_addr_t)((uint8_t *)mem->userspace_addr - phys_ram_base))


A proper fix would probably be to introduce a real KVMSlot structure 
that used the proper types instead of uint64_t.

Regards,

Anthony Liguori

>                  return;
>  
>              /* unregister whole slot */
> @@ -349,7 +349,7 @@ void kvm_set_phys_mem(target_phys_addr_t start_addr,
>              /* register prefix slot */
>              mem_start = slot.guest_phys_addr;
>              mem_size = start_addr - slot.guest_phys_addr;
> -            mem_offset = (uint8_t *)slot.userspace_addr - phys_ram_base;
> +            mem_offset = slot.userspace_addr - (ram_addr_t)phys_ram_base;
>              if (mem_size)
>                  kvm_set_phys_mem(mem_start, mem_size, mem_offset);
>  
>