Non-migrated memory is useful for devices that do not want to take memory
region data with them on migration.
As suggested by Avi, an alternative approach could add a "flags" parameter to
cpu_register_physical_memory() rather than explicityly call
cpu_mark_pages_no_migrate(). However, having a separate function doesn't
require changes to existing call sites.
Cam
---
arch_init.c | 29 +++++++++++++++++------------
cpu-all.h | 2 ++
cpu-common.h | 2 ++
exec.c | 12 ++++++++++++
4 files changed, 33 insertions(+), 12 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index cfc03ea..c2fcad3 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -118,18 +118,22 @@ static int ram_save_block(QEMUFile *f)
current_addr + TARGET_PAGE_SIZE,
MIGRATION_DIRTY_FLAG);
- p = qemu_get_ram_ptr(current_addr);
-
- if (is_dup_page(p, *p)) {
- qemu_put_be64(f, current_addr | RAM_SAVE_FLAG_COMPRESS);
- qemu_put_byte(f, *p);
- } else {
- qemu_put_be64(f, current_addr | RAM_SAVE_FLAG_PAGE);
- qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
- }
+ if (!cpu_physical_memory_get_dirty(current_addr,
+ NO_MIGRATION_FLAG)) {
+ p = qemu_get_ram_ptr(current_addr);
+ printf("migrating: %ld\n", (long)current_addr);
+
+ if (is_dup_page(p, *p)) {
+ qemu_put_be64(f, current_addr | RAM_SAVE_FLAG_COMPRESS);
+ qemu_put_byte(f, *p);
+ } else {
+ qemu_put_be64(f, current_addr | RAM_SAVE_FLAG_PAGE);
+ qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
+ }
- found = 1;
- break;
+ found = 1;
+ break;
+ }
}
addr += TARGET_PAGE_SIZE;
current_addr = (saved_addr + addr) % last_ram_offset;
@@ -146,7 +150,8 @@ static ram_addr_t ram_save_remaining(void)
ram_addr_t count = 0;
for (addr = 0; addr < last_ram_offset; addr += TARGET_PAGE_SIZE) {
- if (cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) {
+ if (!cpu_physical_memory_get_dirty(addr, NO_MIGRATION_FLAG) &&
+ cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) {
count++;
}
}
diff --git a/cpu-all.h b/cpu-all.h
index a4bb4fb..8e2e8c4 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -885,6 +885,8 @@ extern int mem_prealloc;
#define CODE_DIRTY_FLAG 0x02
#define MIGRATION_DIRTY_FLAG 0x08
+#define NO_MIGRATION_FLAG 0x10
+
#define DIRTY_ALL_FLAG (VGA_DIRTY_FLAG | CODE_DIRTY_FLAG |
MIGRATION_DIRTY_FLAG)
/* read dirty bit (return 0 or 1) */
diff --git a/cpu-common.h b/cpu-common.h
index 4b0ba60..a1ebbbe 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -39,6 +39,8 @@ static inline void
cpu_register_physical_memory(target_phys_addr_t start_addr,
cpu_register_physical_memory_offset(start_addr, size, phys_offset, 0);
}
+void cpu_mark_pages_no_migrate(ram_addr_t start, uint64_t size);
+
ram_addr_t cpu_get_physical_page_desc(target_phys_addr_t addr);
ram_addr_t qemu_ram_map(ram_addr_t size, void *host);
ram_addr_t qemu_ram_alloc(ram_addr_t);
diff --git a/exec.c b/exec.c
index 07dc8b6..8c8053f 100644
--- a/exec.c
+++ b/exec.c
@@ -2781,6 +2781,18 @@ static void *file_ram_alloc(ram_addr_t memory, const
char *path)
}
#endif
+void cpu_mark_pages_no_migrate(ram_addr_t start, uint64_t length)
+{
+ int i, len;
+ uint8_t *p;
+
+ len = length >> TARGET_PAGE_BITS;
+ p = phys_ram_flags + (start >> TARGET_PAGE_BITS);
+ for (i = 0; i < len; i++) {
+ p[i] |= NO_MIGRATION_FLAG;
+ }
+}
+
ram_addr_t qemu_ram_map(ram_addr_t size, void *host)
{
RAMBlock *new_block;
--
1.6.3.2.198.g6096d
