[Xen-devel] Re: [PATCH] x86: fix guest migration after c/s 20892:d311d1efc25e

[Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>]

On Fri, 2011-07-15 at 09:55 +0100, Jan Beulich wrote:
> Guests would not manage to run successfully after being migrated to a
> host having sufficiently much more memory than the host they were
> originally started on.
> 
> Subsequently the plan is to re-enable the changes behavior under the
> control of a guest kernel announced feature flag.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Thanks Jan, I think this is a good workaround for the time being.

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

> 
> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -4861,7 +4861,7 @@ long arch_memory_op(int op, XEN_GUEST_HA
>              .max_mfn = MACH2PHYS_NR_ENTRIES - 1
>          };
>  
> -        if ( !mem_hotplug )
> +        if ( !mem_hotplug && current->domain == dom0 )
>              mapping.max_mfn = max_page - 1;
>          if ( copy_to_guest(arg, &mapping, 1) )
>              return -EFAULT;
> 
> 
> 



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