xen/arm: p2m: Allow to flush cache on any RAM region

Currently, we only allow to flush cache on regions mapped as p2m_ram_{rw,ro}.

There are no real problem in cache flushing any RAM regions such as grants
and foreign mapping. Therefore, relax the check to allow flushing the
cache on any RAM region.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/arm/p2m.c

@@ -1539,7 +1539,7 @@ int p2m_cache_flush_range(struct domain *d, gfn_t start, gfn_t end)
         next_gfn = gfn_next_boundary(start, order);
 
         /* Skip hole and non-RAM page */
-        if ( mfn_eq(mfn, INVALID_MFN) || !p2m_is_ram(t) )
+        if ( mfn_eq(mfn, INVALID_MFN) || !p2m_is_any_ram(t) )
             continue;
 
         /* XXX: Implement preemption */