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migration: sync all address spaces 

Migrating a VM during reboot sometimes results in differences
between the source and destination in the SMRAM area.

This is because migration_bitmap_sync() only fetches from KVM
the dirty log of address_space_memory.  SMRAM memory slots
are ignored and the modifications to SMRAM are not sent to the
destination.

Reported-by: He Rongguang <herongguang.he@huawei.com>
Reviewed-by: He Rongguang <herongguang.he@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-09-22 16:08:31 +02:00
parent cc9d8a3b2c
commit 9c1f8f4493
3 changed files with 37 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/exec/memory.h
View File

@ -1188,12 +1188,11 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
hwaddr addr, uint64_t size);
/**
* address_space_sync_dirty_bitmap: synchronize the dirty log for all memory
* memory_global_dirty_log_sync: synchronize the dirty log for all memory
*
* Synchronizes the dirty page log for an entire address space.
* @as: the address space that contains the memory being synchronized
* Synchronizes the dirty page log for all address spaces.
*/
void address_space_sync_dirty_bitmap(AddressSpace *as);
void memory_global_dirty_log_sync(void);
/**
* memory_region_transaction_begin: Start a transaction.

46
memory.c
View File

@ -158,14 +158,10 @@ static bool memory_listener_match(MemoryListener *listener,
/* No need to ref/unref .mr, the FlatRange keeps it alive. */
#define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback, _args...) \
MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) { \
.mr = (fr)->mr, \
.address_space = (as), \
.offset_within_region = (fr)->offset_in_region, \
.size = (fr)->addr.size, \
.offset_within_address_space = int128_get64((fr)->addr.start), \
.readonly = (fr)->readonly, \
}), ##_args)
do { \
MemoryRegionSection mrs = section_from_flat_range(fr, as); \
MEMORY_LISTENER_CALL(callback, dir, &mrs, ##_args); \
} while(0)
struct CoalescedMemoryRange {
AddrRange addr;
@ -245,6 +241,19 @@ typedef struct AddressSpaceOps AddressSpaceOps;
#define FOR_EACH_FLAT_RANGE(var, view) \
for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
static inline MemoryRegionSection
section_from_flat_range(FlatRange *fr, AddressSpace *as)
{
return (MemoryRegionSection) {
.mr = fr->mr,
.address_space = as,
.offset_within_region = fr->offset_in_region,
.size = fr->addr.size,
.offset_within_address_space = int128_get64(fr->addr.start),
.readonly = fr->readonly,
};
}
static bool flatrange_equal(FlatRange *a, FlatRange *b)
{
return a->mr == b->mr
@ -2156,16 +2165,27 @@ bool memory_region_present(MemoryRegion *container, hwaddr addr)
return mr && mr != container;
}
void address_space_sync_dirty_bitmap(AddressSpace *as)
void memory_global_dirty_log_sync(void)
{
MemoryListener *listener;
AddressSpace *as;
FlatView *view;
FlatRange *fr;
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
QTAILQ_FOREACH(listener, &memory_listeners, link) {
if (!listener->log_sync) {
continue;
}
/* Global listeners are being phased out. */
assert(listener->address_space_filter);
as = listener->address_space_filter;
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
MemoryRegionSection mrs = section_from_flat_range(fr, as);
listener->log_sync(listener, &mrs);
}
flatview_unref(view);
}
flatview_unref(view);
}
void memory_global_dirty_log_start(void)

2
migration/ram.c
View File

@ -626,7 +626,7 @@ static void migration_bitmap_sync(void)
}
trace_migration_bitmap_sync_start();
address_space_sync_dirty_bitmap(&address_space_memory);
memory_global_dirty_log_sync();
qemu_mutex_lock(&migration_bitmap_mutex);
rcu_read_lock();