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Remove uses of ram.last_offset (aka last_ram_offset)

Browse source 
We currently need this either to allocate the next ram_addr_t for a
new block, or for total memory to be migrated.  Both of which we can
calculate without need of this to keep us in a contiguous address space.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Alex Williamson 2010-06-25 11:08:38 -06:00 committed by Anthony Liguori
parent f292787d9a
commit d17b5288d9
3 changed files with 30 additions and 13 deletions
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23
arch_init.c
View file

@ -108,9 +108,10 @@ static int ram_save_block(QEMUFile *f)
static ram_addr_t current_addr = 0;
ram_addr_t saved_addr = current_addr;
ram_addr_t addr = 0;
uint64_t total_ram = ram_bytes_total();
int bytes_sent = 0;
while (addr < ram_list.last_offset) {
while (addr < total_ram) {
if (cpu_physical_memory_get_dirty(current_addr, MIGRATION_DIRTY_FLAG)) {
uint8_t *p;
@ -133,7 +134,7 @@ static int ram_save_block(QEMUFile *f)
break;
}
addr += TARGET_PAGE_SIZE;
current_addr = (saved_addr + addr) % ram_list.last_offset;
current_addr = (saved_addr + addr) % total_ram;
}
return bytes_sent;
@ -145,8 +146,9 @@ static ram_addr_t ram_save_remaining(void)
{
ram_addr_t addr;
ram_addr_t count = 0;
uint64_t total_ram = ram_bytes_total();
for (addr = 0; addr < ram_list.last_offset; addr += TARGET_PAGE_SIZE) {
for (addr = 0; addr < total_ram; addr += TARGET_PAGE_SIZE) {
if (cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) {
count++;
}
@ -167,7 +169,13 @@ uint64_t ram_bytes_transferred(void)
uint64_t ram_bytes_total(void)
{
return ram_list.last_offset;
RAMBlock *block;
uint64_t total = 0;
QLIST_FOREACH(block, &ram_list.blocks, next)
total += block->length;
return total;
}
int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
@ -188,10 +196,11 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
}
if (stage == 1) {
uint64_t total_ram = ram_bytes_total();
bytes_transferred = 0;
/* Make sure all dirty bits are set */
for (addr = 0; addr < ram_list.last_offset; addr += TARGET_PAGE_SIZE) {
for (addr = 0; addr < total_ram; addr += TARGET_PAGE_SIZE) {
if (!cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) {
cpu_physical_memory_set_dirty(addr);
}
@ -200,7 +209,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
/* Enable dirty memory tracking */
cpu_physical_memory_set_dirty_tracking(1);
qemu_put_be64(f, ram_list.last_offset | RAM_SAVE_FLAG_MEM_SIZE);
qemu_put_be64(f, total_ram | RAM_SAVE_FLAG_MEM_SIZE);
}
bytes_transferred_last = bytes_transferred;
@ -259,7 +268,7 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
addr &= TARGET_PAGE_MASK;
if (flags & RAM_SAVE_FLAG_MEM_SIZE) {
if (addr != ram_list.last_offset) {
if (addr != ram_bytes_total()) {
return -EINVAL;
}
}

1
cpu-all.h
View file

@ -870,7 +870,6 @@ typedef struct RAMBlock {
typedef struct RAMList {
uint8_t *phys_dirty;
ram_addr_t last_offset;
QLIST_HEAD(ram, RAMBlock) blocks;
} RAMList;
extern RAMList ram_list;

19
exec.c
View file

@ -2767,6 +2767,17 @@ static void *file_ram_alloc(ram_addr_t memory, const char *path)
}
#endif
static ram_addr_t find_ram_offset(ram_addr_t size)
{
RAMBlock *block;
ram_addr_t last = 0;
QLIST_FOREACH(block, &ram_list.blocks, next)
last = MAX(last, block->offset + block->length);
return last;
}
ram_addr_t qemu_ram_alloc(ram_addr_t size)
{
RAMBlock *new_block;
@ -2800,18 +2811,16 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
madvise(new_block->host, size, MADV_MERGEABLE);
#endif
}
new_block->offset = ram_list.last_offset;
new_block->offset = find_ram_offset(size);
new_block->length = size;
QLIST_INSERT_HEAD(&ram_list.blocks, new_block, next);
ram_list.phys_dirty = qemu_realloc(ram_list.phys_dirty,
(ram_list.last_offset + size) >> TARGET_PAGE_BITS);
memset(ram_list.phys_dirty + (ram_list.last_offset >> TARGET_PAGE_BITS),
(new_block->offset + size) >> TARGET_PAGE_BITS);
memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
0xff, size >> TARGET_PAGE_BITS);
ram_list.last_offset += size;
if (kvm_enabled())
kvm_setup_guest_memory(new_block->host, size);