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migration/ram: Fix populate_read_range()

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Unfortunately, commit f7b9dcfbcf broke populate_read_range(): the loop
end condition is very wrong, resulting in that function not populating the
full range. Lets' fix that.

Fixes: f7b9dcfbcf ("migration/ram: Factor out populating pages readable in ram_block_populate_pages()")
Cc: qemu-stable@nongnu.org
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit 5f19a4491941fdc5c5b50ce4ade6ffffe0f591b4)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
David Hildenbrand 2023-01-05 13:45:24 +01:00 committed by Michael Tokarev
parent ee2ec0ac52
commit eca533b60a
1 changed files with 3 additions and 1 deletions
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4
migration/ram.c
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@ -1765,13 +1765,15 @@ out:
static inline void populate_read_range(RAMBlock *block, ram_addr_t offset,
ram_addr_t size)
{
const ram_addr_t end = offset + size;
/*
* We read one byte of each page; this will preallocate page tables if
* required and populate the shared zeropage on MAP_PRIVATE anonymous memory
* where no page was populated yet. This might require adaption when
* supporting other mappings, like shmem.
*/
for (; offset < size; offset += block->page_size) {
for (; offset < end; offset += block->page_size) {
char tmp = *((char *)block->host + offset);
/* Don't optimize the read out */