[RFC for-4.8 4/6] xen/arm: Add helper functions to map RWX memory regions

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Create a helper function to map regions as MEMORY with
cached attributes and read-write-execute permissions.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 xen/arch/arm/p2m.c        | 26 ++++++++++++++++++++++++++
 xen/include/asm-arm/p2m.h | 10 ++++++++++
 2 files changed, 36 insertions(+)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index db21433..7e788f9 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1219,6 +1219,32 @@ int p2m_populate_ram(struct domain *d,
                              d->arch.p2m.default_access);
 }
 
+int map_regions_rwx_cache(struct domain *d,
+                         unsigned long start_gfn,
+                         unsigned long nr,
+                         unsigned long mfn)
+{
+    return apply_p2m_changes(d, INSERT,
+                             pfn_to_paddr(start_gfn),
+                             pfn_to_paddr(start_gfn + nr),
+                             pfn_to_paddr(mfn),
+                             MATTR_MEM, 0, p2m_ram_rw,
+                             p2m_access_rwx);
+}
+
+int unmap_regions_rwx_cache(struct domain *d,
+                           unsigned long start_gfn,
+                           unsigned long nr,
+                           unsigned long mfn)
+{
+    return apply_p2m_changes(d, REMOVE,
+                             pfn_to_paddr(start_gfn),
+                             pfn_to_paddr(start_gfn + nr),
+                             pfn_to_paddr(mfn),
+                             MATTR_MEM, 0, p2m_invalid,
+                             p2m_access_rwx);
+}
+
 int map_regions_rw_cache(struct domain *d,
                          unsigned long start_gfn,
                          unsigned long nr,
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index d240d1e..294050e 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -144,6 +144,16 @@ int p2m_cache_flush(struct domain *d, xen_pfn_t start_mfn, xen_pfn_t end_mfn);
 /* Setup p2m RAM mapping for domain d from start-end. */
 int p2m_populate_ram(struct domain *d, paddr_t start, paddr_t end);
 
+int map_regions_rwx_cache(struct domain *d,
+                          unsigned long start_gfn,
+                          unsigned long nr_mfns,
+                          unsigned long mfn);
+
+int unmap_regions_rwx_cache(struct domain *d,
+                            unsigned long start_gfn,
+                            unsigned long nr_mfns,
+                            unsigned long mfn);
+
 int map_regions_rw_cache(struct domain *d,
                          unsigned long start_gfn,
                          unsigned long nr_mfns,
-- 
2.5.0


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