[Xen-devel] PV and FV networks cannot coexist on HVM guest.

["Zhao, Yunfeng" <yunfeng.zhao@xxxxxxxxx>]

HVM guest cannot load VNIF module if it is already loaded PV network
driver.
And following error messages will be printed on hvm guest console.

vif vif-0: 2 parsing device/vif/0/mac
netif_release_rx_bufs: fix me for copying receiver.
------------[ cut here ]------------
kernel BUG at net/core/dev.c:3073!
invalid opcode: 0000 [#1]
Modules linked in: xen_vnif xen_vbd xenbus xen_platform_pci ipv6
dm_mirror dm_multipath dm_mod 8139cp mii floppy ext3 jbd
CPU:    0
EIP:    0060:[<c0280069>]    Not tainted VLI
EFLAGS: 00010206   (2.6.16.29 #1)
EIP is at unregister_netdevice+0x78/0x1e6
eax: 00000005   ebx: d4f20000   ecx: 00000000   edx: db940000
esi: 00000005   edi: c4852627   ebp: e08cada0   esp: db940f34
ds: 007b   es: 007b   ss: 0068
Process xenwatch (pid: 3906, threadinfo=db940000 task=dec1e000)
Stack: <0>d4f20000 00000005 c4852627 c02801e6 dd346000 e08c783d dd346000
e0936a7f
       22222222 22222222 c4852608 c4852680 dd346010 c4852680 e09360e0
e09360af
       db940000 dd7a3eec e09361fe 00000000 dec1e000 c0126f92 db940fac
db940fac
Call Trace:
 [<c02801e6>] unregister_netdev+0xf/0x15
 [<e08c783d>] netfront_closing+0xe/0x16 [xen_vnif]
 [<e0936a7f>] otherend_changed+0x92/0x9a [xenbus]
 [<e09360e0>] xenwatch_thread+0x0/0x134 [xenbus]
 [<e09360af>] xenwatch_handle_callback+0x12/0x43 [xenbus]
 [<e09361fe>] xenwatch_thread+0x11e/0x134 [xenbus]
 [<c0126f92>] autoremove_wake_function+0x0/0x2d
 [<c0126f92>] autoremove_wake_function+0x0/0x2d
 [<c0126b45>] kthread+0x75/0x9d
 [<c0126ad0>] kthread+0x0/0x9d
 [<c01012a1>] kernel_thread_helper+0x5/0xb
Code: 83 c4 0c 8b 83 9c 01 00 00 85 c0 75 19 53 53 68 bd e4 30 c0 e8 83
78 e9 ff 83 c4 0c b8 ed ff ff ff e9 6f 01 00 00 83 f8 02 74 08 <0f> 0b
01 0c 2a e0 30 c0 f6 43 5c 01 74 07 89 d8 e8 30 de ff ff
 BUG: xenwatch/3906, lock held at task exit time!
 [e093d740] {xenwatch_mutex}
.. held by:          xenwatch: 3906 [dec1e000, 110]
... acquired at:               xenwatch_thread+0xac/0x134 [xenbus]

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