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[Qemu-devel] [5433] Add dirty tracking for live migration
From: |
Anthony Liguori |
Subject: |
[Qemu-devel] [5433] Add dirty tracking for live migration |
Date: |
Mon, 06 Oct 2008 14:02:03 +0000 |
Revision: 5433
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5433
Author: aliguori
Date: 2008-10-06 14:02:03 +0000 (Mon, 06 Oct 2008)
Log Message:
-----------
Add dirty tracking for live migration
This patch adds a dirty tracking bit for live migration. We use 0x08 because
kqemu uses 0x04.
Signed-off-by: Anthony Liguori <address@hidden>
Modified Paths:
--------------
trunk/cpu-all.h
trunk/exec.c
Modified: trunk/cpu-all.h
===================================================================
--- trunk/cpu-all.h 2008-10-06 13:55:43 UTC (rev 5432)
+++ trunk/cpu-all.h 2008-10-06 14:02:03 UTC (rev 5433)
@@ -904,8 +904,10 @@
int cpu_memory_rw_debug(CPUState *env, target_ulong addr,
uint8_t *buf, int len, int is_write);
-#define VGA_DIRTY_FLAG 0x01
-#define CODE_DIRTY_FLAG 0x02
+#define VGA_DIRTY_FLAG 0x01
+#define CODE_DIRTY_FLAG 0x02
+#define KQEMU_DIRTY_FLAG 0x04
+#define MIGRATION_DIRTY_FLAG 0x08
/* read dirty bit (return 0 or 1) */
static inline int cpu_physical_memory_is_dirty(ram_addr_t addr)
@@ -928,6 +930,10 @@
int dirty_flags);
void cpu_tlb_update_dirty(CPUState *env);
+int cpu_physical_memory_set_dirty_tracking(int enable);
+
+int cpu_physical_memory_get_dirty_tracking(void);
+
void dump_exec_info(FILE *f,
int (*cpu_fprintf)(FILE *f, const char *fmt, ...));
Modified: trunk/exec.c
===================================================================
--- trunk/exec.c 2008-10-06 13:55:43 UTC (rev 5432)
+++ trunk/exec.c 2008-10-06 14:02:03 UTC (rev 5433)
@@ -38,6 +38,7 @@
#include "qemu-common.h"
#include "tcg.h"
#include "hw/hw.h"
+#include "osdep.h"
#if defined(CONFIG_USER_ONLY)
#include <qemu.h>
#endif
@@ -113,6 +114,7 @@
int phys_ram_fd;
uint8_t *phys_ram_base;
uint8_t *phys_ram_dirty;
+static int in_migration;
static ram_addr_t phys_ram_alloc_offset = 0;
#endif
@@ -1809,6 +1811,17 @@
}
}
+int cpu_physical_memory_set_dirty_tracking(int enable)
+{
+ in_migration = enable;
+ return 0;
+}
+
+int cpu_physical_memory_get_dirty_tracking(void)
+{
+ return in_migration;
+}
+
static inline void tlb_update_dirty(CPUTLBEntry *tlb_entry)
{
ram_addr_t ram_addr;
@@ -2964,9 +2977,19 @@
io_index = (pd >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
io_mem_write[io_index][2](io_mem_opaque[io_index], addr, val);
} else {
- ptr = phys_ram_base + (pd & TARGET_PAGE_MASK) +
- (addr & ~TARGET_PAGE_MASK);
+ unsigned long addr1 = (pd & TARGET_PAGE_MASK) + (addr &
~TARGET_PAGE_MASK);
+ ptr = phys_ram_base + addr1;
stl_p(ptr, val);
+
+ if (unlikely(in_migration)) {
+ if (!cpu_physical_memory_is_dirty(addr1)) {
+ /* invalidate code */
+ tb_invalidate_phys_page_range(addr1, addr1 + 4, 0);
+ /* set dirty bit */
+ phys_ram_dirty[addr1 >> TARGET_PAGE_BITS] |=
+ (0xff & ~CODE_DIRTY_FLAG);
+ }
+ }
}
}
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