[PATCH v4 04/15] exec: Factor out setting ram settings (madvise ...) into qemu_ram_apply_settings()

[David Hildenbrand <david@redhat.com>]

Factor all settings out into qemu_ram_apply_settings().

For memory_try_enable_merging(), the important bit is that it won't be
called with XEN - which is now still the case as new_block->host will
remain NULL.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 exec.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/exec.c b/exec.c
index 3e980e14e0..13a0ca91fb 100644
--- a/exec.c
+++ b/exec.c
@@ -2069,6 +2069,21 @@ static int memory_try_enable_merging(void *addr, size_t len)
     return qemu_madvise(addr, len, QEMU_MADV_MERGEABLE);
 }
 
+static void qemu_ram_apply_settings(void *host, size_t length)
+{
+    memory_try_enable_merging(host, length);
+    qemu_ram_setup_dump(host, length);
+    qemu_madvise(host, length, QEMU_MADV_HUGEPAGE);
+    /*
+     * MADV_DONTFORK is also needed by KVM in absence of synchronous MMU
+     * Configure it unless the machine is a qtest server, in which case KVM is
+     * not used and it may be forked (eg for fuzzing purposes).
+     */
+    if (!qtest_enabled()) {
+        qemu_madvise(host, length, QEMU_MADV_DONTFORK);
+    }
+}
+
 /*
  * Resizing RAM while migrating can result in the migration being canceled.
  * Care has to be taken if the guest might have already detected the memory.
@@ -2227,7 +2242,6 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared)
                 qemu_mutex_unlock_ramlist();
                 return;
             }
-            memory_try_enable_merging(new_block->host, new_block->max_length);
         }
     }
 
@@ -2265,17 +2279,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared)
                                         DIRTY_CLIENTS_ALL);
 
     if (new_block->host) {
-        qemu_ram_setup_dump(new_block->host, new_block->max_length);
-        qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_HUGEPAGE);
-        /*
-         * MADV_DONTFORK is also needed by KVM in absence of synchronous MMU
-         * Configure it unless the machine is a qtest server, in which case
-         * KVM is not used and it may be forked (eg for fuzzing purposes).
-         */
-        if (!qtest_enabled()) {
-            qemu_madvise(new_block->host, new_block->max_length,
-                         QEMU_MADV_DONTFORK);
-        }
+        qemu_ram_apply_settings(new_block->host, new_block->max_length);
         ram_block_notify_add(new_block->host, new_block->used_length,
                              new_block->max_length);
     }
-- 
2.24.1