[Qemu-devel] [PATCH] e1000: pre-initialize RAH/RAL registers

["Gabriel L. Somlo" <gsomlo@gmail.com>]

Some guest operating systems' drivers (Mac OS X in particular) fail to
properly initialize the Receive Address registers (probably expecting
them to be pre-initialized by an earlier component, such as a proprietary
BIOS). This patch pre-initializes the RA registers, allowing OS X
networking to function properly. Other guest operating systems are not
affected, and free to (re)initialize these registers during boot.

Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
---
 hw/e1000.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/hw/e1000.c b/hw/e1000.c
index e4f1ffe..6478ff3 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -278,6 +278,10 @@ static void e1000_reset(void *opaque)
     if (d->nic->nc.link_down) {
         e1000_link_down(d);
     }
+
+  /* Some guests expect pre-initialized RAH/RAL (AddrValid flag + MACaddr) */
+  d->mac_reg[RA+1] = E1000_RAH_AV;
+  memmove(&d->mac_reg[RA], &d->conf.macaddr, sizeof(struct MACAddr));
 }
 
 static void
-- 
1.7.7.6