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Re: [Qemu-devel] [PATCH] Fix calculation of number of bits in the migrat


From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH] Fix calculation of number of bits in the migration bitmap
Date: Wed, 31 Oct 2012 13:24:16 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121016 Thunderbird/16.0.1

On 10/31/2012 01:19 PM, Orit Wasserman wrote:
> The number of bits is off by one, for example if last_ram_offset
> is 0x1000 (the guest has one page) we get 0 bits instead of 1.
> 
> Signed-off-by: Orit Wasserman <address@hidden>
> ---
>  arch_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch_init.c b/arch_init.c
> index b75a4c5..a80c3c8 100644
> --- a/arch_init.c
> +++ b/arch_init.c
> @@ -565,7 +565,7 @@ static void reset_ram_globals(void)
>  static int ram_save_setup(QEMUFile *f, void *opaque)
>  {
>      RAMBlock *block;
> -    int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS;
> +    int64_t ram_pages = (last_ram_offset() >> TARGET_PAGE_BITS) + 1;
>  

The original code calculates 1 for your example case.


-- 
error compiling committee.c: too many arguments to function



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