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135 lines
5.4 KiB
135 lines
5.4 KiB
From 5ea59b17866add54e5ae8c76d3cb472c67e1fa91 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Tue, 2 Aug 2022 08:19:49 +0200
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Subject: [PATCH 32/32] Revert "migration: Simplify unqueue_page()"
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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 112: Fix postcopy migration on s390x
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RH-Commit: [2/2] 3913c9ed3f27f4b66245913da29d0c46db0c6567 (thuth/qemu-kvm-cs9)
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RH-Bugzilla: 2099934
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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This reverts commit cfd66f30fb0f735df06ff4220e5000290a43dad3.
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The simplification of unqueue_page() introduced a bug that sometimes
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breaks migration on s390x hosts.
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The problem is not fully understood yet, but since we are already in
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the freeze for QEMU 7.1 and we need something working there, let's
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revert this patch for the upcoming release. The optimization can be
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redone later again in a proper way if necessary.
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2099934
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Message-Id: <20220802061949.331576-1-thuth@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 777f53c75983dd10756f5dbfc8af50fe11da81c1)
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Conflicts:
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migration/trace-events
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(trivial contextual conflict)
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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---
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migration/ram.c | 37 ++++++++++++++++++++++++++-----------
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migration/trace-events | 3 ++-
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2 files changed, 28 insertions(+), 12 deletions(-)
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diff --git a/migration/ram.c b/migration/ram.c
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index fb6db54642..ee40e4a718 100644
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--- a/migration/ram.c
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+++ b/migration/ram.c
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@@ -1548,7 +1548,6 @@ static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset)
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{
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struct RAMSrcPageRequest *entry;
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RAMBlock *block = NULL;
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- size_t page_size;
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if (!postcopy_has_request(rs)) {
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return NULL;
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@@ -1565,13 +1564,10 @@ static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset)
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entry = QSIMPLEQ_FIRST(&rs->src_page_requests);
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block = entry->rb;
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*offset = entry->offset;
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- page_size = qemu_ram_pagesize(block);
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- /* Each page request should only be multiple page size of the ramblock */
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- assert((entry->len % page_size) == 0);
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- if (entry->len > page_size) {
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- entry->len -= page_size;
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- entry->offset += page_size;
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+ if (entry->len > TARGET_PAGE_SIZE) {
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+ entry->len -= TARGET_PAGE_SIZE;
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+ entry->offset += TARGET_PAGE_SIZE;
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} else {
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memory_region_unref(block->mr);
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QSIMPLEQ_REMOVE_HEAD(&rs->src_page_requests, next_req);
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@@ -1579,9 +1575,6 @@ static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset)
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migration_consume_urgent_request();
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}
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- trace_unqueue_page(block->idstr, *offset,
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- test_bit((*offset >> TARGET_PAGE_BITS), block->bmap));
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-
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return block;
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}
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@@ -1956,8 +1949,30 @@ static bool get_queued_page(RAMState *rs, PageSearchStatus *pss)
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{
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RAMBlock *block;
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ram_addr_t offset;
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+ bool dirty;
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+
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+ do {
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+ block = unqueue_page(rs, &offset);
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+ /*
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+ * We're sending this page, and since it's postcopy nothing else
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+ * will dirty it, and we must make sure it doesn't get sent again
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+ * even if this queue request was received after the background
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+ * search already sent it.
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+ */
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+ if (block) {
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+ unsigned long page;
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+
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+ page = offset >> TARGET_PAGE_BITS;
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+ dirty = test_bit(page, block->bmap);
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+ if (!dirty) {
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+ trace_get_queued_page_not_dirty(block->idstr, (uint64_t)offset,
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+ page);
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+ } else {
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+ trace_get_queued_page(block->idstr, (uint64_t)offset, page);
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+ }
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+ }
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- block = unqueue_page(rs, &offset);
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+ } while (block && !dirty);
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if (!block) {
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/*
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diff --git a/migration/trace-events b/migration/trace-events
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index 1aec580e92..09d61ed1f4 100644
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--- a/migration/trace-events
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+++ b/migration/trace-events
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@@ -85,6 +85,8 @@ put_qlist_end(const char *field_name, const char *vmsd_name) "%s(%s)"
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qemu_file_fclose(void) ""
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# ram.c
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+get_queued_page(const char *block_name, uint64_t tmp_offset, unsigned long page_abs) "%s/0x%" PRIx64 " page_abs=0x%lx"
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+get_queued_page_not_dirty(const char *block_name, uint64_t tmp_offset, unsigned long page_abs) "%s/0x%" PRIx64 " page_abs=0x%lx"
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migration_bitmap_sync_start(void) ""
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migration_bitmap_sync_end(uint64_t dirty_pages) "dirty_pages %" PRIu64
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migration_bitmap_clear_dirty(char *str, uint64_t start, uint64_t size, unsigned long page) "rb %s start 0x%"PRIx64" size 0x%"PRIx64" page 0x%lx"
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@@ -110,7 +112,6 @@ ram_save_iterate_big_wait(uint64_t milliconds, int iterations) "big wait: %" PRI
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ram_load_complete(int ret, uint64_t seq_iter) "exit_code %d seq iteration %" PRIu64
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ram_write_tracking_ramblock_start(const char *block_id, size_t page_size, void *addr, size_t length) "%s: page_size: %zu addr: %p length: %zu"
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ram_write_tracking_ramblock_stop(const char *block_id, size_t page_size, void *addr, size_t length) "%s: page_size: %zu addr: %p length: %zu"
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-unqueue_page(char *block, uint64_t offset, bool dirty) "ramblock '%s' offset 0x%"PRIx64" dirty %d"
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# multifd.c
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multifd_new_send_channel_async(uint8_t id) "channel %u"
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--
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2.31.1
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