xen/arm: mm: Introduce _PAGE_PRESENT and _PAGE_POPULATE

At the moment, the flags are not enough to describe what kind of update
will done on the VA range. They need to be used in conjunction with the
enum xenmap_operation.

It would be more convenient to have all the information for the update
in a single place.

Two new flags are added to remove the relience on xenmap_operation:
    - _PAGE_PRESENT: Indicate whether we are adding/removing the mapping
    - _PAGE_POPULATE: Indicate whether we only populate page-tables

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

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 23e9565ddc280669819a1aa71d1f3323eac4f295..b13d9adf409ca8a314adce8a01bc28c2b2fe0262 100644 (file)
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1056,7 +1056,7 @@ int map_pages_to_xen(unsigned long virt,
 
 int populate_pt_range(unsigned long virt, unsigned long nr_mfns)
 {
-    return xen_pt_update(RESERVE, virt, INVALID_MFN, nr_mfns, 0);
+    return xen_pt_update(RESERVE, virt, INVALID_MFN, nr_mfns, _PAGE_POPULATE);
 }
 
 int destroy_xen_mappings(unsigned long v, unsigned long e)

diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h
index 2bcdb0f1a5cf3abd74ba696f0db8781549a1041f..37e1d9aadbd635a5724c6477e6bf3c1f41160f57 100644 (file)
--- a/xen/include/asm-arm/page.h
+++ b/xen/include/asm-arm/page.h
@@ -76,6 +76,8 @@
  *
  * [0:2] Memory Attribute Index
  * [3:4] Permission flags
+ * [5]   Page present
+ * [6]   Only populate page tables
  */
 #define PAGE_AI_MASK(x) ((x) & 0x7U)
 
@@ -86,12 +88,15 @@
 #define PAGE_XN_MASK(x) (((x) >> _PAGE_XN_BIT) & 0x1U)
 #define PAGE_RO_MASK(x) (((x) >> _PAGE_RO_BIT) & 0x1U)
 
+#define _PAGE_PRESENT    (1U << 5)
+#define _PAGE_POPULATE   (1U << 6)
+
 /*
  * _PAGE_DEVICE and _PAGE_NORMAL are convenience defines. They are not
  * meant to be used outside of this header.
  */
-#define _PAGE_DEVICE    _PAGE_XN
-#define _PAGE_NORMAL    MT_NORMAL
+#define _PAGE_DEVICE    (_PAGE_XN|_PAGE_PRESENT)
+#define _PAGE_NORMAL    (MT_NORMAL|_PAGE_PRESENT)
 
 #define PAGE_HYPERVISOR_RO      (_PAGE_NORMAL|_PAGE_RO|_PAGE_XN)
 #define PAGE_HYPERVISOR_RX      (_PAGE_NORMAL|_PAGE_RO)