Re: [PATCH] libkvm: fix physical_memory calculation

[Avi Kivity <avi@qumranet.com>]

Jan Kiszka wrote:
> This looks bogus, but it is so far without practical impact (phys_start
> is always 0 when we do the calculation).
>
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
>  libkvm/libkvm.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: b/libkvm/libkvm.c
> ===================================================================
> --- a/libkvm/libkvm.c
> +++ b/libkvm/libkvm.c
> @@ -550,7 +550,7 @@ int kvm_register_userspace_phys_mem(kvm_
>  	int r;
>  
>  	if (!kvm->physical_memory)
> -		kvm->physical_memory = userspace_addr - phys_start;
> +		kvm->physical_memory = userspace_addr + phys_start;
>  
>   

I think it's correct. The intent (probably) was that 
kvm->physical_memory[x] would refer to the contents of physical memory 
address x.

In another way, it's incorrect, since nothing guarantees (now) that 
memory is contiguous.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.


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