Re: [Xen-devel] [PATCH v8 04/15] xen: add function for obtaining highest possible memory address

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.09.17 at 08:34, <jgross@xxxxxxxx> wrote:
> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -6312,6 +6312,17 @@ int pv_ro_page_fault(unsigned long addr, struct 
> cpu_user_regs *regs)
>      return 0;
>  }
>  
> +unsigned long arch_get_upper_mfn_bound(void)
> +{
> +    unsigned long max_mfn;
> +
> +    max_mfn = mem_hotplug ? PFN_DOWN(mem_hotplug) : max_page;

Taking into account the code in the caller of this function as well
as the ARM counterpart I find the use of max_page here odd. I'd
prefer if get_upper_mfn_bound() went away altogether, and it's
sole caller (which strangely enough doesn't get introduced here)
called the arch function directly. Additionally, with the caller being
a sysctl, how is that supposed to help a PV DomU kernel in their
choice of grant table version?

Jan


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