Signed-off-by: zhanghailiang <address@hidden>
---
include/migration/migration.h | 4 ++--
migration/migration.c | 2 +-
migration/postcopy-ram.c | 17 ++++++++++++++++-
migration/ram.c | 37 +++++++++++++++++++++++++++++++------
4 files changed, 50 insertions(+), 10 deletions(-)
diff --git a/include/migration/migration.h b/include/migration/migration.h
index ef4c071..435de31 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -127,7 +127,7 @@ struct MigrationSrcPageRequest {
RAMBlock *rb;
hwaddr offset;
hwaddr len;
-
+ uint8_t *pages_copy_addr;
QSIMPLEQ_ENTRY(MigrationSrcPageRequest) next_req;
};
@@ -333,7 +333,7 @@ void global_state_store_running(void);
void flush_page_queue(MigrationState *ms);
int ram_save_queue_pages(MigrationState *ms, const char *rbname,
- ram_addr_t start, ram_addr_t len);
+ ram_addr_t start, ram_addr_t len, bool copy_pages);
PostcopyState postcopy_state_get(void);
/* Set the state and return the old state */
diff --git a/migration/migration.c b/migration/migration.c
index 3765c3b..bf4c7a1 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1248,7 +1248,7 @@ static void migrate_handle_rp_req_pages(MigrationState
*ms, const char* rbname,
return;
}
- if (ram_save_queue_pages(ms, rbname, start, len)) {
+ if (ram_save_queue_pages(ms, rbname, start, len, false)) {
mark_source_rp_bad(ms);
}
}
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 61392d3..2cf477d 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -543,13 +543,28 @@ static void *postcopy_ram_fault_thread(void *opaque)
MigrationState *ms = container_of(us, MigrationState,
userfault_state);
ret = ram_save_queue_pages(ms, qemu_ram_get_idstr(rb), rb_offset,
- hostpagesize);
+ hostpagesize, true);
if (ret < 0) {
error_report("%s: Save: %"PRIx64 " failed!",
__func__, (uint64_t)msg.arg.pagefault.address);
break;
}
+
+ /* Note: In the setup process, snapshot_thread may modify VM's
+ * write-protected pages, we should not block it there, or there
+ * will be an deadlock error.
+ */
+ if (migration_in_setup(ms)) {
+ uint64_t host = msg.arg.pagefault.address;
+
+ host &= ~(hostpagesize - 1);
+ ret = ram_set_pages_wp(host, getpagesize(), true,
+ us->userfault_fd);
+ if (ret < 0) {
+ error_report("Remove page's write-protect failed");
+ }
+ }
}
}
trace_postcopy_ram_fault_thread_exit();
diff --git a/migration/ram.c b/migration/ram.c
index 8656719..747f9aa 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -233,6 +233,7 @@ struct PageSearchStatus {
ram_addr_t offset;
/* Set once we wrap around */
bool complete_round;
+ uint8_t *pages_copy;
};
typedef struct PageSearchStatus PageSearchStatus;
@@ -742,7 +743,12 @@ static int ram_save_page(QEMUFile *f, PageSearchStatus
*pss,
RAMBlock *block = pss->block;
ram_addr_t offset = pss->offset;
- p = block->host + offset;
+ /* If we have a copy of this page, use the backup page first */
+ if (pss->pages_copy) {
+ p = pss->pages_copy;
+ } else {
+ p = block->host + offset;
+ }
/* In doubt sent page as normal */
bytes_xmit = 0;
@@ -926,7 +932,12 @@ static int ram_save_compressed_page(QEMUFile *f,
PageSearchStatus *pss,
RAMBlock *block = pss->block;
ram_addr_t offset = pss->offset;
- p = block->host + offset;
+ /* If we have a copy of this page, use the backup first */
+ if (pss->pages_copy) {
+ p = pss->pages_copy;
+ } else {
+ p = block->host + offset;
+ }
bytes_xmit = 0;
ret = ram_control_save_page(f, block->offset,
@@ -1043,7 +1054,7 @@ static bool find_dirty_block(QEMUFile *f,
PageSearchStatus *pss,
* Returns: block (or NULL if none available)
*/
static RAMBlock *unqueue_page(MigrationState *ms, ram_addr_t *offset,
- ram_addr_t *ram_addr_abs)
+ ram_addr_t *ram_addr_abs, uint8
**pages_copy_addr)
{
RAMBlock *block = NULL;
@@ -1055,7 +1066,7 @@ static RAMBlock *unqueue_page(MigrationState *ms,
ram_addr_t *offset,
*offset = entry->offset;
*ram_addr_abs = (entry->offset + entry->rb->offset) &
TARGET_PAGE_MASK;
-
+ *pages_copy_addr = entry->pages_copy_addr;
if (entry->len > TARGET_PAGE_SIZE) {
entry->len -= TARGET_PAGE_SIZE;
entry->offset += TARGET_PAGE_SIZE;
@@ -1086,9 +1097,10 @@ static bool get_queued_page(MigrationState *ms,
PageSearchStatus *pss,
RAMBlock *block;
ram_addr_t offset;
bool dirty;
+ uint8 *pages_backup_addr = NULL;
do {
- block = unqueue_page(ms, &offset, ram_addr_abs);
+ block = unqueue_page(ms, &offset, ram_addr_abs, &pages_backup_addr);
/*
* We're sending this page, and since it's postcopy nothing else
* will dirty it, and we must make sure it doesn't get sent again
@@ -1130,6 +1142,7 @@ static bool get_queued_page(MigrationState *ms,
PageSearchStatus *pss,
*/
pss->block = block;
pss->offset = offset;
+ pss->pages_copy = pages_backup_addr;
}
return !!block;
@@ -1166,7 +1179,7 @@ void flush_page_queue(MigrationState *ms)
* Return: 0 on success
*/
int ram_save_queue_pages(MigrationState *ms, const char *rbname,
- ram_addr_t start, ram_addr_t len)
+ ram_addr_t start, ram_addr_t len, bool copy_pages)
{
RAMBlock *ramblock;
@@ -1206,6 +1219,17 @@ int ram_save_queue_pages(MigrationState *ms, const char
*rbname,
new_entry->rb = ramblock;
new_entry->offset = start;
new_entry->len = len;
+ if (copy_pages) {
+ /* Fix me: Better to realize a memory pool */
+ new_entry->pages_copy_addr = g_try_malloc0(len);
+
+ if (!new_entry->pages_copy_addr) {
+ error_report("%s: Failed to alloc memory", __func__);
+ return -1;
+ }
+
+ memcpy(new_entry->pages_copy_addr, ramblock_ptr(ramblock, start), len);
+ }
memory_region_ref(ramblock->mr);
qemu_mutex_lock(&ms->src_page_req_mutex);
@@ -1342,6 +1366,7 @@ static int ram_find_and_save_block(QEMUFile *f, bool
last_stage,
pss.block = last_seen_block;
pss.offset = last_offset;
pss.complete_round = false;
+ pss.pages_copy = NULL;
if (!pss.block) {
pss.block = QLIST_FIRST_RCU(&ram_list.blocks);
--
1.8.3.1