Il 21/09/2012 16:08, Juan Quintela ha scritto:
> From: Umesh Deshpande <udesh...@redhat.com>
>
> This will be used to detect if last_block might have become invalid
> across different calls to ram_save_live.
>
> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
> Signed-off-by: Umesh Deshpande <udesh...@redhat.com>
> Signed-off-by: Juan Quintela <quint...@redhat.com>
> ---
> arch_init.c | 7 ++++++-
> cpu-all.h | 1 +
> exec.c | 4 ++++
> 3 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/arch_init.c b/arch_init.c
> index d96e888..eb33fdd 100644
> --- a/arch_init.c
> +++ b/arch_init.c
> @@ -336,6 +336,7 @@ static RAMBlock *last_block;
> static ram_addr_t last_offset;
> static unsigned long *migration_bitmap;
> static uint64_t migration_dirty_pages;
> +static uint32_t last_version;
>
> static inline bool migration_bitmap_test_and_reset_dirty(MemoryRegion *mr,
> ram_addr_t offset)
> @@ -406,7 +407,6 @@ static void migration_bitmap_sync(void)
> }
> }
>
> -
> /*
> * ram_save_block: Writes a page of memory to the stream f
> *
> @@ -558,6 +558,7 @@ static void reset_ram_globals(void)
> {
> last_block = NULL;
> last_offset = 0;
> + last_version = ram_list.version;
> sort_ram_list();
> }
>
> @@ -613,6 +614,10 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
> uint64_t expected_downtime;
> MigrationState *s = migrate_get_current();
>
> + if (ram_list.version != last_version) {
> + reset_ram_globals();
> + }
> +
> bytes_transferred_last = bytes_transferred;
> bwidth = qemu_get_clock_ns(rt_clock);
>
Assuming ram_save_iterate() will take the RAM lock throughout, that's ok.
> diff --git a/cpu-all.h b/cpu-all.h
> index 3e67019..6576229 100644
> --- a/cpu-all.h
> +++ b/cpu-all.h
> @@ -497,6 +497,7 @@ typedef struct RAMBlock {
>
> typedef struct RAMList {
> uint8_t *phys_dirty;
> + uint32_t version;
> QLIST_HEAD(, RAMBlock) blocks_mru;
> QLIST_HEAD(, RAMBlock) blocks;
> } RAMList;
> diff --git a/exec.c b/exec.c
> index 0db2beb..e9d1509 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -2583,6 +2583,8 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size,
> void *host,
> QLIST_INSERT_HEAD(&ram_list.blocks, new_block, next);
> QLIST_INSERT_HEAD(&ram_list.blocks_mru, new_block, next_mru);
>
> + ram_list.version++;
> +
> ram_list.phys_dirty = g_realloc(ram_list.phys_dirty,
> last_ram_offset() >>
> TARGET_PAGE_BITS);
> memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
> @@ -2610,6 +2612,7 @@ void qemu_ram_free_from_ptr(ram_addr_t addr)
> if (addr == block->offset) {
> QLIST_REMOVE(block, next);
> QLIST_REMOVE(block, next_mru);
> + ram_list.version++;
> g_free(block);
> return;
> }
> @@ -2624,6 +2627,7 @@ void qemu_ram_free(ram_addr_t addr)
> if (addr == block->offset) {
> QLIST_REMOVE(block, next);
> QLIST_REMOVE(block, next_mru);
> + ram_list.version++;
> if (block->flags & RAM_PREALLOC_MASK) {
> ;
> } else if (mem_path) {
>
Reviewed-by: Paolo Bonzini <pbonz...@gnu.org>
