[Qemu-devel] [PATCH] e1000/rtl8139: forbid dealing with packets when VM is paused

[zhanghailiang]

For e1000/rtl8139, qemu can still send/receive packets when VM is paused.
If this happened in *migration's* last PAUSE VM stage, the new dirty RAM 
related to the packets will be missed.
To avoid this, do things like virtio-net, forbid sending/receiving packets when 
VM is suspend.

Signed-off-by: zhanghailiang <address@hidden>
---
 hw/net/e1000.c   | 5 +++--
 hw/net/rtl8139.c | 3 +++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index 8387443..94108fd 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -885,9 +885,10 @@ static int
 e1000_can_receive(NetClientState *nc)
 {
     E1000State *s = qemu_get_nic_opaque(nc);
-
+    int vmstat = runstate_is_running();
+       
     return (s->mac_reg[STATUS] & E1000_STATUS_LU) &&
-        (s->mac_reg[RCTL] & E1000_RCTL_EN) && e1000_has_rxbufs(s, 1);
+        (s->mac_reg[RCTL] & E1000_RCTL_EN) && e1000_has_rxbufs(s, 1) && vmstat;
 }
 
 static uint64_t rx_desc_base(E1000State *s)
diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
index 5329f44..3c60c84 100644
--- a/hw/net/rtl8139.c
+++ b/hw/net/rtl8139.c
@@ -799,7 +799,10 @@ static int rtl8139_can_receive(NetClientState *nc)
 {
     RTL8139State *s = qemu_get_nic_opaque(nc);
     int avail;
+    int vmstat = runstate_is_running();
 
+    if (!vmstat) 
+        return 0;
     /* Receive (drop) packets if card is disabled.  */
     if (!s->clock_enabled)
       return 1;
-- 
1.7.12.4