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From 6d52c264fa9a7a78ee532f45d24704491ce4c431 Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Wed, 1 Aug 2018 13:55:09 +0100
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Subject: [PATCH 05/21] migration: introduce control_save_page()
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20180801135522.11658-6-dgilbert@redhat.com>
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Patchwork-id: 81581
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O-Subject: [qemu-kvm RHEL8/virt212 PATCH 05/18] migration: introduce control_save_page()
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Bugzilla: 1594384
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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From: Xiao Guangrong <xiaoguangrong@tencent.com>
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Abstract the common function control_save_page() to cleanup the code,
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no logic is changed
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>
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Message-Id: <20180330075128.26919-6-xiaoguangrong@tencent.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 059ff0fb29dd3a56ac2843676915efc279938c6b)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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 migration/ram.c | 174 +++++++++++++++++++++++++++++---------------------------
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 1 file changed, 89 insertions(+), 85 deletions(-)
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diff --git a/migration/ram.c b/migration/ram.c
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index cd6d98a..8dc98a5 100644
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--- a/migration/ram.c
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+++ b/migration/ram.c
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@@ -975,6 +975,44 @@ static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
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     ram_discard_range(rbname, offset, pages << TARGET_PAGE_BITS);
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 }
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+/*
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+ * @pages: the number of pages written by the control path,
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+ *        < 0 - error
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+ *        > 0 - number of pages written
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+ *
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+ * Return true if the pages has been saved, otherwise false is returned.
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+ */
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+static bool control_save_page(RAMState *rs, RAMBlock *block, ram_addr_t offset,
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+                              int *pages)
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+{
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+    uint64_t bytes_xmit = 0;
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+    int ret;
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+
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+    *pages = -1;
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+    ret = ram_control_save_page(rs->f, block->offset, offset, TARGET_PAGE_SIZE,
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+                                &bytes_xmit);
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+    if (ret == RAM_SAVE_CONTROL_NOT_SUPP) {
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+        return false;
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+    }
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+
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+    if (bytes_xmit) {
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+        ram_counters.transferred += bytes_xmit;
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+        *pages = 1;
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+    }
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+
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+    if (ret == RAM_SAVE_CONTROL_DELAYED) {
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+        return true;
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+    }
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+
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+    if (bytes_xmit > 0) {
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+        ram_counters.normal++;
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+    } else if (bytes_xmit == 0) {
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+        ram_counters.duplicate++;
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+    }
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+
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+    return true;
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+}
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+
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 /**
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  * ram_save_page: send the given page to the stream
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  *
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@@ -991,56 +1029,36 @@ static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
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 static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage)
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 {
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     int pages = -1;
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-    uint64_t bytes_xmit;
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-    ram_addr_t current_addr;
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     uint8_t *p;
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-    int ret;
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     bool send_async = true;
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     RAMBlock *block = pss->block;
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     ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
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+    ram_addr_t current_addr = block->offset + offset;
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     p = block->host + offset;
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     trace_ram_save_page(block->idstr, (uint64_t)offset, p);
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-    /* In doubt sent page as normal */
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-    bytes_xmit = 0;
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-    ret = ram_control_save_page(rs->f, block->offset,
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-                           offset, TARGET_PAGE_SIZE, &bytes_xmit);
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-    if (bytes_xmit) {
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-        ram_counters.transferred += bytes_xmit;
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-        pages = 1;
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+    if (control_save_page(rs, block, offset, &pages)) {
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+        return pages;
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     }
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     XBZRLE_cache_lock();
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-
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-    current_addr = block->offset + offset;
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-
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-    if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
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-        if (ret != RAM_SAVE_CONTROL_DELAYED) {
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-            if (bytes_xmit > 0) {
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-                ram_counters.normal++;
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-            } else if (bytes_xmit == 0) {
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-                ram_counters.duplicate++;
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-            }
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-        }
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-    } else {
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-        pages = save_zero_page(rs, block, offset);
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-        if (pages > 0) {
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-            /* Must let xbzrle know, otherwise a previous (now 0'd) cached
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-             * page would be stale
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+    pages = save_zero_page(rs, block, offset);
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+    if (pages > 0) {
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+        /* Must let xbzrle know, otherwise a previous (now 0'd) cached
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+         * page would be stale
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+         */
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+        xbzrle_cache_zero_page(rs, current_addr);
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+        ram_release_pages(block->idstr, offset, pages);
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+    } else if (!rs->ram_bulk_stage &&
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+               !migration_in_postcopy() && migrate_use_xbzrle()) {
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+        pages = save_xbzrle_page(rs, &p, current_addr, block,
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+                                 offset, last_stage);
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+        if (!last_stage) {
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+            /* Can't send this cached data async, since the cache page
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+             * might get updated before it gets to the wire
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              */
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-            xbzrle_cache_zero_page(rs, current_addr);
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-            ram_release_pages(block->idstr, offset, pages);
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-        } else if (!rs->ram_bulk_stage &&
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-                   !migration_in_postcopy() && migrate_use_xbzrle()) {
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-            pages = save_xbzrle_page(rs, &p, current_addr, block,
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-                                     offset, last_stage);
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-            if (!last_stage) {
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-                /* Can't send this cached data async, since the cache page
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-                 * might get updated before it gets to the wire
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-                 */
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-                send_async = false;
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-            }
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+            send_async = false;
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         }
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     }
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@@ -1175,63 +1193,49 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss,
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                                     bool last_stage)
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 {
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     int pages = -1;
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-    uint64_t bytes_xmit = 0;
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     uint8_t *p;
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-    int ret;
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     RAMBlock *block = pss->block;
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     ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
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     p = block->host + offset;
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-    ret = ram_control_save_page(rs->f, block->offset,
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-                                offset, TARGET_PAGE_SIZE, &bytes_xmit);
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-    if (bytes_xmit) {
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-        ram_counters.transferred += bytes_xmit;
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-        pages = 1;
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+    if (control_save_page(rs, block, offset, &pages)) {
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+        return pages;
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     }
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-    if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
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-        if (ret != RAM_SAVE_CONTROL_DELAYED) {
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-            if (bytes_xmit > 0) {
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-                ram_counters.normal++;
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-            } else if (bytes_xmit == 0) {
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-                ram_counters.duplicate++;
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-            }
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+
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+    /* When starting the process of a new block, the first page of
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+     * the block should be sent out before other pages in the same
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+     * block, and all the pages in last block should have been sent
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+     * out, keeping this order is important, because the 'cont' flag
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+     * is used to avoid resending the block name.
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+     */
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+    if (block != rs->last_sent_block) {
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+        flush_compressed_data(rs);
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+        pages = save_zero_page(rs, block, offset);
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+        if (pages > 0) {
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+            ram_release_pages(block->idstr, offset, pages);
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+        } else {
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+            /*
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+             * Make sure the first page is sent out before other pages.
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+             *
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+             * we post it as normal page as compression will take much
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+             * CPU resource.
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+             */
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+            ram_counters.transferred += save_page_header(rs, rs->f, block,
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+                                            offset | RAM_SAVE_FLAG_PAGE);
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+            qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE,
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+                                  migrate_release_ram() &
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+                                  migration_in_postcopy());
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+            ram_counters.transferred += TARGET_PAGE_SIZE;
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+            ram_counters.normal++;
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+            pages = 1;
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         }
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     } else {
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-        /* When starting the process of a new block, the first page of
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-         * the block should be sent out before other pages in the same
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-         * block, and all the pages in last block should have been sent
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-         * out, keeping this order is important, because the 'cont' flag
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-         * is used to avoid resending the block name.
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-         */
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-        if (block != rs->last_sent_block) {
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-            flush_compressed_data(rs);
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-            pages = save_zero_page(rs, block, offset);
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-            if (pages > 0) {
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-                ram_release_pages(block->idstr, offset, pages);
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-            } else {
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-                /*
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-                 * Make sure the first page is sent out before other pages.
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-                 *
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-                 * we post it as normal page as compression will take much
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-                 * CPU resource.
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-                 */
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-                ram_counters.transferred += save_page_header(rs, rs->f, block,
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-                                                offset | RAM_SAVE_FLAG_PAGE);
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-                qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE,
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-                                      migrate_release_ram() &
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-                                      migration_in_postcopy());
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-                ram_counters.transferred += TARGET_PAGE_SIZE;
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-                ram_counters.normal++;
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-                pages = 1;
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-            }
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+        pages = save_zero_page(rs, block, offset);
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+        if (pages == -1) {
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+            pages = compress_page_with_multi_thread(rs, block, offset);
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         } else {
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-            pages = save_zero_page(rs, block, offset);
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-            if (pages == -1) {
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-                pages = compress_page_with_multi_thread(rs, block, offset);
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-            } else {
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-                ram_release_pages(block->idstr, offset, pages);
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-            }
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+            ram_release_pages(block->idstr, offset, pages);
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         }
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     }
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-- 
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1.8.3.1
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