On Thu, 27 Jan 2011, Alex wrote:

[..]
> the HVM kernel just panics and I remember seeing something along the lines of
> "do something smart?"
> 
> does this patch you mention fix that?

Yes. See http://www.freebsd.org/cgi/query-pr.cgi?pr=154302

The patch is also attached to this mail.

Best Regards,
--
Janne Snabb / EPIPE Communications
sn...@epipe.com - http://epipe.com/
--- sys/dev/xen/netfront/netfront.c.orig        2010-12-21 17:09:25.000000000 
+0000
+++ sys/dev/xen/netfront/netfront.c     2011-01-17 10:11:06.000000000 +0000
@@ -401,13 +401,14 @@
 xen_net_read_mac(device_t dev, uint8_t mac[])
 {
        int error, i;
        char *s, *e, *macstr;
 
-       error = xs_read(XST_NIL, xenbus_get_node(dev), "mac", NULL,
-           (void **) &macstr);
-       if (error)
+       if ((error = xs_read(XST_NIL, xenbus_get_node(dev), "mac", NULL,
+           (void **) &macstr)) != 0 &&
+           (error = xs_read(XST_NIL, xenbus_get_otherend_path(dev), 
+           "mac", NULL, (void **) &macstr)) != 0)
                return (error);
 
        s = macstr;
        for (i = 0; i < ETHER_ADDR_LEN; i++) {
                mac[i] = strtoul(s, &e, 16);
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