xen/balloon: Don't rely on the page granularity is the same for Xen and Linux
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. Signed-off-by:Julien Grall <julien.grall@citrix.com> Reviewed-by:
Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by:
David Vrabel <david.vrabel@citrix.com>
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