[Xen-devel] [PATCH][VT] fix bug that service os&vmx guest can't communicate with each other.

[Edwin Zhai <edwin.zhai@xxxxxxxxx>]

fix bug that service os&vmx guest can't communicate with each other.
Signed-off-by: Edwin Zhai <edwin.zhai@xxxxxxxxx>
Signed-off-by: Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>

diff -r 04ca47c298b5 -r a80889c7da99 tools/ioemu/hw/pcnet.c
--- a/tools/ioemu/hw/pcnet.c    Thu Sep  1 21:30:51 2005
+++ b/tools/ioemu/hw/pcnet.c    Mon Sep  5 09:33:29 2005
@@ -380,10 +380,13 @@
     return sizeof(s->buffer)-16;
 }
 
+#define MIN_BUF_SIZE 60
+
 static void pcnet_receive(void *opaque, const uint8_t *buf, int size)
 {
     PCNetState *s = opaque;
     int is_padr = 0, is_bcast = 0, is_ladr = 0;
+    uint8_t buf1[60];
 
     if (CSR_DRX(s) || CSR_STOP(s) || CSR_SPND(s) || !size)
         return;
@@ -391,6 +394,14 @@
 #ifdef PCNET_DEBUG
     printf("pcnet_receive size=%d\n", size);
 #endif
+
+    /* if too small buffer, then expand it */
+    if (size < MIN_BUF_SIZE) {
+        memcpy(buf1, buf, size);
+        memset(buf1 + size, 0, MIN_BUF_SIZE - size);
+        buf = buf1;
+        size = MIN_BUF_SIZE;
+    }
 
     if (CSR_PROM(s) 
         || (is_padr=padr_match(s, buf, size)) 


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