* [Qemu-devel] [RFC PATCH 7/6] savevm: Create a new continue flag to avoid resending block name
[not found] <0100608191447.4451.47795.stgit@localhost.localdomain>
@ 2010-06-08 21:11 ` Alex Williamson
2010-06-08 21:32 ` [Qemu-devel] " Alex Williamson
0 siblings, 1 reply; 3+ messages in thread
From: Alex Williamson @ 2010-06-08 21:11 UTC (permalink / raw)
To: qemu-devel, anthony; +Cc: chrisw, alex.williamson, kvm, quintela
Allows us to compress the protocol a bit.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
arch_init.c | 77 +++++++++++++++++++++++++++++++++--------------------------
1 files changed, 43 insertions(+), 34 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index 5780195..8ae6a10 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -87,6 +87,7 @@ const uint32_t arch_type = QEMU_ARCH;
#define RAM_SAVE_FLAG_MEM_SIZE 0x04
#define RAM_SAVE_FLAG_PAGE 0x08
#define RAM_SAVE_FLAG_EOS 0x10
+#define RAM_SAVE_FLAG_CONTINUE 0x20
static int is_dup_page(uint8_t *page, uint8_t ch)
{
@@ -120,6 +121,7 @@ static int ram_save_block(QEMUFile *f)
do {
if (cpu_physical_memory_get_dirty(current_addr, MIGRATION_DIRTY_FLAG)) {
uint8_t *p;
+ int cont = (block == last_block) ? RAM_SAVE_FLAG_CONTINUE : 0;
cpu_physical_memory_reset_dirty(current_addr,
current_addr + TARGET_PAGE_SIZE,
@@ -128,13 +130,17 @@ static int ram_save_block(QEMUFile *f)
p = block->host + offset;
if (is_dup_page(p, *p)) {
- qemu_put_be64(f, offset | RAM_SAVE_FLAG_COMPRESS);
- qemu_put_buffer(f, (uint8_t *)block->name, sizeof(block->name));
+ qemu_put_be64(f, offset | cont | RAM_SAVE_FLAG_COMPRESS);
+ if (!cont)
+ qemu_put_buffer(f, (uint8_t *)block->name,
+ sizeof(block->name));
qemu_put_byte(f, *p);
bytes_sent = 1;
} else {
- qemu_put_be64(f, offset | RAM_SAVE_FLAG_PAGE);
- qemu_put_buffer(f, (uint8_t *)block->name, sizeof(block->name));
+ qemu_put_be64(f, offset | cont | RAM_SAVE_FLAG_PAGE);
+ if (!cont)
+ qemu_put_buffer(f, (uint8_t *)block->name,
+ sizeof(block->name));
qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
bytes_sent = TARGET_PAGE_SIZE;
}
@@ -284,6 +290,33 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
return (stage == 2) && (expected_time <= migrate_max_downtime());
}
+static inline void *host_from_stream_offset(QEMUFile *f,
+ ram_addr_t offset,
+ int flags)
+{
+ static RAMBlock *block = NULL;
+ char name[64];
+
+ if (flags & RAM_SAVE_FLAG_CONTINUE) {
+ if (!block) {
+ fprintf(stderr, "Ack, bad migration stream!\n");
+ return NULL;
+ }
+
+ return block->host + offset;
+ }
+
+ qemu_get_buffer(f, (uint8_t *)name, sizeof(name));
+
+ QLIST_FOREACH(block, &ram.blocks, next) {
+ if (!strncmp(name, block->name, sizeof(name)))
+ return block->host + offset;
+ }
+
+ fprintf(stderr, "Can't find block %s!\n", name);
+ return NULL;
+}
+
int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
@@ -337,23 +370,11 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
void *host;
uint8_t ch;
- if (version_id == 3) {
+ if (version_id == 3)
host = qemu_get_ram_ptr(addr);
- } else {
- RAMBlock *block;
- char name[64];
-
- qemu_get_buffer(f, (uint8_t *)name, sizeof(name));
+ else
+ host = host_from_stream_offset(f, addr, flags);
- QLIST_FOREACH(block, &ram.blocks, next) {
- if (!strncmp(name, block->name, sizeof(name)))
- break;
- }
- if (!block)
- return -EINVAL;
-
- host = block->host + addr;
- }
ch = qemu_get_byte(f);
memset(host, ch, TARGET_PAGE_SIZE);
#ifndef _WIN32
@@ -365,23 +386,11 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
} else if (flags & RAM_SAVE_FLAG_PAGE) {
void *host;
- if (version_id == 3) {
+ if (version_id == 3)
host = qemu_get_ram_ptr(addr);
- } else {
- RAMBlock *block;
- char name[64];
+ else
+ host = host_from_stream_offset(f, addr, flags);
- qemu_get_buffer(f, (uint8_t *)name, sizeof(name));
-
- QLIST_FOREACH(block, &ram.blocks, next) {
- if (!strncmp(name, block->name, sizeof(name)))
- break;
- }
- if (!block)
- return -EINVAL;
-
- host = block->host + addr;
- }
qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
}
if (qemu_file_has_error(f)) {
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