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memory: Introduce log_sync_global() to memory listener

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Some of the memory listener may want to do log synchronization without
being able to specify a range of memory to sync but always globally.
Such a memory listener should provide this new method instead of the
log_sync() method.

Obviously we can also achieve similar thing when we put the global
sync logic into a log_sync() handler. However that's not efficient
enough because otherwise memory_global_dirty_log_sync() may do the
global sync N times, where N is the number of flat ranges in the
address space.

Make this new method be exclusive to log_sync().

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210506160549.130416-2-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2021-05-06 12:05:40 -04:00 committed by Paolo Bonzini
parent 70cbae429e
commit b87eaa9b82
2 changed files with 35 additions and 10 deletions
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12
include/exec/memory.h
View file

@ -616,6 +616,18 @@ struct MemoryListener {
*/
void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
/**
* @log_sync_global:
*
* This is the global version of @log_sync when the listener does
* not have a way to synchronize the log with finer granularity.
* When the listener registers with @log_sync_global defined, then
* its @log_sync must be NULL. Vice versa.
*
* @listener: The #MemoryListener.
*/
void (*log_sync_global)(MemoryListener *listener);
/**
* @log_clear:
*

33
softmmu/memory.c
View file

@ -2055,6 +2055,10 @@ void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
memory_region_get_dirty_log_mask(mr));
}
/*
* If memory region `mr' is NULL, do global sync. Otherwise, sync
* dirty bitmap for the specified memory region.
*/
static void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
{
MemoryListener *listener;
@ -2068,18 +2072,24 @@ static void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
* address space once.
*/
QTAILQ_FOREACH(listener, &memory_listeners, link) {
if (!listener->log_sync) {
continue;
}
as = listener->address_space;
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->dirty_log_mask && (!mr || fr->mr == mr)) {
MemoryRegionSection mrs = section_from_flat_range(fr, view);
listener->log_sync(listener, &mrs);
if (listener->log_sync) {
as = listener->address_space;
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->dirty_log_mask && (!mr || fr->mr == mr)) {
MemoryRegionSection mrs = section_from_flat_range(fr, view);
listener->log_sync(listener, &mrs);
}
}
flatview_unref(view);
} else if (listener->log_sync_global) {
/*
* No matter whether MR is specified, what we can do here
* is to do a global sync, because we are not capable to
* sync in a finer granularity.
*/
listener->log_sync_global(listener);
}
flatview_unref(view);
}
}
@ -2767,6 +2777,9 @@ void memory_listener_register(MemoryListener *listener, AddressSpace *as)
{
MemoryListener *other = NULL;
/* Only one of them can be defined for a listener */
assert(!(listener->log_sync && listener->log_sync_global));
listener->address_space = as;
if (QTAILQ_EMPTY(&memory_listeners)
|| listener->priority >= QTAILQ_LAST(&memory_listeners)->priority) {