[RFC PATCH 14/26] migration: Introduce gpa_inside_migration_helper_shared_area

[Dov Murik <dovmurik@linux.vnet.ibm.com>]

The gpa_inside_migration_helper_shared_area will be used to skip
migrating RAM pages that are used by the migration helper at the target.

Signed-off-by: Dov Murik <dovmurik@linux.vnet.ibm.com>
---
 migration/confidential-ram.h | 2 ++
 migration/confidential-ram.c | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/migration/confidential-ram.h b/migration/confidential-ram.h
index ebe4073bce..9a1027bdaf 100644
--- a/migration/confidential-ram.h
+++ b/migration/confidential-ram.h
@@ -8,6 +8,8 @@
 #include "exec/cpu-common.h"
 #include "qemu-file.h"
 
+bool gpa_inside_migration_helper_shared_area(ram_addr_t gpa);
+
 void cgs_mh_init(void);
 void cgs_mh_cleanup(void);
 
diff --git a/migration/confidential-ram.c b/migration/confidential-ram.c
index fe317ee74b..0b821af774 100644
--- a/migration/confidential-ram.c
+++ b/migration/confidential-ram.c
@@ -68,6 +68,12 @@ static CGSMigHelperState cmhs = {0};
 #define MH_SHARED_CMD_PARAMS_ADDR    0x820000
 #define MH_SHARED_IO_PAGE_HDR_ADDR   (MH_SHARED_CMD_PARAMS_ADDR + 0x800)
 #define MH_SHARED_IO_PAGE_ADDR       (MH_SHARED_CMD_PARAMS_ADDR + 0x1000)
+#define MH_SHARED_LAST_BYTE          (MH_SHARED_CMD_PARAMS_ADDR + 0x1fff)
+
+bool gpa_inside_migration_helper_shared_area(ram_addr_t gpa)
+{
+    return gpa >= MH_SHARED_CMD_PARAMS_ADDR && gpa <= MH_SHARED_LAST_BYTE;
+}
 
 void cgs_mh_init(void)
 {
-- 
2.20.1