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cpu_physical_memory_sync_dirty_bitmap: Fix alignment check

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This code has an optimised, word aligned version, and a boring
unaligned version.  Recently 084140bd49 fixed a missing offset
addition from the core of both versions.  However, the offset isn't
necessarily aligned and thus the choice between the two versions
needs fixing up to also include the offset.

Symptom:
  A few stuck unsent pages during migration; not normally noticed
unless under very low bandwidth in which case the migration may get
stuck never ending and never performing a 2nd sync; noticed by
a hanging postcopy-test on a very heavily loaded system.

Fixes: 084140bd49

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reported-by: Alex Benneé <alex.benee@linaro.org>
Tested-by: Alex Benneé <alex.benee@linaro.org>

--
v2
  Move 'page' inside the if (Comment from Paolo)
Message-Id: <20170724165125.29887-1-dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2017-07-24 17:51:25 +01:00 committed by Paolo Bonzini
parent 452589b6b4
commit f70d3451fe
1 changed files with 4 additions and 3 deletions
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7
include/exec/ram_addr.h
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@ -377,19 +377,20 @@ uint64_t cpu_physical_memory_sync_dirty_bitmap(RAMBlock *rb,
uint64_t *real_dirty_pages)
{
ram_addr_t addr;
unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
unsigned long word = BIT_WORD((start + rb->offset) >> TARGET_PAGE_BITS);
uint64_t num_dirty = 0;
unsigned long *dest = rb->bmap;
/* start address is aligned at the start of a word? */
if (((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) {
if (((word * BITS_PER_LONG) << TARGET_PAGE_BITS) ==
(start + rb->offset)) {
int k;
int nr = BITS_TO_LONGS(length >> TARGET_PAGE_BITS);
unsigned long * const *src;
unsigned long word = BIT_WORD((start + rb->offset) >> TARGET_PAGE_BITS);
unsigned long idx = (word * BITS_PER_LONG) / DIRTY_MEMORY_BLOCK_SIZE;
unsigned long offset = BIT_WORD((word * BITS_PER_LONG) %
DIRTY_MEMORY_BLOCK_SIZE);
unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
rcu_read_lock();