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memory: Fix up memory_region_{add|del}_coalescing 

The old memory_region_{add|clear}_coalescing() has some defects
because they both changed mr->coalesced before updating the regions
using memory_region_update_coalesced_range_as().  Then when the
regions were updated in memory_region_update_coalesced_range_as() the
mr->coalesced will always be either one more or one less.  So:

- For memory_region_add_coalescing: it'll always trying to remove the
  newly added coalesced region while it shouldn't, and,

- For memory_region_clear_coalescing: when it calls the update there
  will be no coalesced ranges on mr->coalesced because they were all
  removed before hand so the update will probably do nothing for real.

Let's fix this.  Now we've got flat_range_coalesced_io_notify() to
notify a single CoalescedMemoryRange instance change, so use it in the
existing memory_region_update_coalesced_range() logic by only notify
either an addition or deletion.  Then we hammer both the
memory_region_{add|clear}_coalescing() to use it.

Fixes: 3ac7d43a6f
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20190820141328.10009-5-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2019-08-20 22:13:28 +08:00 committed by Paolo Bonzini
parent 264ef5a5c5
commit b960fc1796
1 changed files with 17 additions and 19 deletions
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36
memory.c
View File

@ -2243,27 +2243,26 @@ void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize, Error **errp
qemu_ram_resize(mr->ram_block, newsize, errp);
}
static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
/*
* Call proper memory listeners about the change on the newly
* added/removed CoalescedMemoryRange.
*/
static void memory_region_update_coalesced_range(MemoryRegion *mr,
CoalescedMemoryRange *cmr,
bool add)
{
AddressSpace *as;
FlatView *view;
FlatRange *fr;
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->mr == mr) {
flat_range_coalesced_io_del(fr, as);
flat_range_coalesced_io_add(fr, as);
}
}
flatview_unref(view);
}
static void memory_region_update_coalesced_range(MemoryRegion *mr)
{
AddressSpace *as;
QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
memory_region_update_coalesced_range_as(mr, as);
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->mr == mr) {
flat_range_coalesced_io_notify(fr, as, cmr, add);
}
}
flatview_unref(view);
}
}
@ -2281,7 +2280,7 @@ void memory_region_add_coalescing(MemoryRegion *mr,
cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
memory_region_update_coalesced_range(mr);
memory_region_update_coalesced_range(mr, cmr, true);
memory_region_set_flush_coalesced(mr);
}
@ -2299,10 +2298,9 @@ void memory_region_clear_coalescing(MemoryRegion *mr)
while (!QTAILQ_EMPTY(&mr->coalesced)) {
cmr = QTAILQ_FIRST(&mr->coalesced);
QTAILQ_REMOVE(&mr->coalesced, cmr, link);
memory_region_update_coalesced_range(mr, cmr, false);
g_free(cmr);
}
memory_region_update_coalesced_range(mr);
}
void memory_region_set_flush_coalesced(MemoryRegion *mr)