Subject: [PATCH 40/46] migration: ram_handle_compressed

From: Nigel Croxon <[email-masked]>
Date: Thu, 14 Nov 2013 22:53:16 +0100

RH-Author: Nigel Croxon <[email-masked]>
Message-id: <[email-masked]>
Patchwork-id: 55727
O-Subject: [RHEL7.0 PATCH 40/42] migration: ram_handle_compressed
Bugzilla: 1011720
RH-Acked-by: Orit Wasserman <[email-masked]>
RH-Acked-by: Amit Shah <[email-masked]>
RH-Acked-by: Paolo Bonzini <[email-masked]>

Bugzilla: 1011720
https://bugzilla.redhat.com/show_bug.cgi?id=1011720

>From commit ID:
commit d613a56f845788412a442c6b5aff88b38244f99a
Author: Isaku Yamahata <[email-masked]>
Date:   Sat Sep 21 01:23:37 2013 +0900

    migration: ram_handle_compressed

    ram_handle_compressed() should be aware of size > TARGET_PAGE_SIZE.
    migration-rdma can call it with larger size.

    Signed-off-by: Isaku Yamahata <[email-masked]>
    Signed-off-by: Juan Quintela <[email-masked]>
---
 arch_init.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

Signed-off-by: Michal Novotny <[email-masked]>
---
 arch_init.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index 5ce9c61..d71fb33 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -848,13 +848,14 @@ static inline void *host_from_stream_offset(QEMUFile *f,
  */
 void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
 {
-    if (ch != 0 || !is_zero_range(host, TARGET_PAGE_SIZE)) {
+    if (ch != 0 || !is_zero_range(host, size)) {
         memset(host, ch, size);
 #ifndef _WIN32
-        if (ch == 0 &&
-            (!kvm_enabled() || kvm_has_sync_mmu()) &&
-            getpagesize() <= TARGET_PAGE_SIZE) {
-            qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED);
+        if (ch == 0 && (!kvm_enabled() || kvm_has_sync_mmu())) {
+            size = size & ~(getpagesize() - 1);
+            if (size > 0) {
+                qemu_madvise(host, size, QEMU_MADV_DONTNEED);
+            }
         }
 #endif
     }
-- 
1.7.11.7