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Re: [Xen-devel] [PATCH v3 12/20] xen/balloon: Don't rely on the page granularity is the same for Xen and Linux

On 07/08/15 17:46, Julien Grall wrote:
> For ARM64 guests, Linux is able to support either 64K or 4K page
> granularity. Although, the hypercall interface is always based on 4K
> page granularity.
> With 64K page granularity, a single page will be spread over multiple
> Xen frame.
> To avoid splitting the page into 4K frame, take advantage of the
> extent_order field to directly allocate/free chunk of the Linux page
> size.
> Note that PVMMU is only used for PV guest (which is x86) and the page
> granularity is always 4KB. Some BUILD_BUG_ON has been added to ensure
> that because the code has not been modified.
> +             /* We don't support PV MMU when Linux and Xen is using
> +              * different page granularity.
> +              */

You don't need this BUILD_BUG_ON() twice.


Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>


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