[PATCH v1 5/6] xen/riscv: add new p2m types and helper macros for type classification

[Oleksii Kurochko]

- Extended p2m_type_t with additional types: p2m_ram_ro, p2m_mmio_direct_dev,
  p2m_map_foreign_{rw,ro}, p2m_grant_map_{rw,ro}.
- Added macros to classify memory types: P2M_RAM_TYPES, P2M_GRANT_TYPES,
  P2M_FOREIGN_TYPES.
- Introduced helper predicates: p2m_is_ram(), p2m_is_foreign(),
  p2m_is_any_ram().

Signed-off-by: Oleksii Kurochko <oleksii.kuroc...@gmail.com>
---
 xen/arch/riscv/include/asm/p2m.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/xen/arch/riscv/include/asm/p2m.h b/xen/arch/riscv/include/asm/p2m.h
index 8b46210768..0fcfec7f03 100644
--- a/xen/arch/riscv/include/asm/p2m.h
+++ b/xen/arch/riscv/include/asm/p2m.h
@@ -80,8 +80,36 @@ struct p2m_domain {
 typedef enum {
     p2m_invalid = 0,    /* Nothing mapped here */
     p2m_ram_rw,         /* Normal read/write domain RAM */
+    p2m_ram_ro,         /* Read-only; writes are silently dropped */
+    p2m_mmio_direct_dev,/* Read/write mapping of genuine Device MMIO area */
+    p2m_map_foreign_rw, /* Read/write RAM pages from foreign domain */
+    p2m_map_foreign_ro, /* Read-only RAM pages from foreign domain */
+    p2m_grant_map_rw,   /* Read/write grant mapping */
+    p2m_grant_map_ro,   /* Read-only grant mapping */
 } p2m_type_t;
 
+/* We use bitmaps and mask to handle groups of types */
+#define p2m_to_mask(t_) BIT(t_, UL)
+
+/* RAM types, which map to real machine frames */
+#define P2M_RAM_TYPES (p2m_to_mask(p2m_ram_rw) | \
+                       p2m_to_mask(p2m_ram_ro))
+
+/* Grant mapping types, which map to a real frame in another VM */
+#define P2M_GRANT_TYPES (p2m_to_mask(p2m_grant_map_rw) | \
+                         p2m_to_mask(p2m_grant_map_ro))
+
+/* Foreign mappings types */
+#define P2M_FOREIGN_TYPES (p2m_to_mask(p2m_map_foreign_rw) | \
+                           p2m_to_mask(p2m_map_foreign_ro))
+
+/* Useful predicates */
+#define p2m_is_ram(t_) (p2m_to_mask(t_) & P2M_RAM_TYPES)
+#define p2m_is_foreign(t_) (p2m_to_mask(t_) & P2M_FOREIGN_TYPES)
+#define p2m_is_any_ram(t_) (p2m_to_mask(t_) & \
+                            (P2M_RAM_TYPES | P2M_GRANT_TYPES | \
+                             P2M_FOREIGN_TYPES))
+
 #include <xen/p2m-common.h>
 
 static inline int get_page_and_type(struct page_info *page,
-- 
2.49.0