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Re: [Qemu-devel] [Crucial bug] Qemu-2.0.0 do not support virtio-net hot

From: Andreas Färber
Subject: Re: [Qemu-devel] [Crucial bug] Qemu-2.0.0 do not support virtio-net hot plug/unplug exceed two times
Date: Tue, 06 May 2014 15:58:04 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

Am 06.05.2014 15:41, schrieb Gonglei (Arei):
>> Am 06.05.2014 14:52, schrieb Gonglei (Arei):
>>> Step 1: I executed "device_add virtio-net-pci,id=net1"
>>> with "info pci", I found the net1, showing as below:
>>> Bus  0, device   4, function 0:
>>>     Ethernet controller: PCI device 1af4:1000
>>>       IRQ 0.
>>>       BAR0: I/O at 0xffffffffffffffff [0x001e].
>>>       BAR1: 32 bit memory at 0xffffffffffffffff [0x00000ffe].
>>>       BAR6: 32 bit memory at 0xffffffffffffffff [0x0003fffe].
>>>       id "net1"
>>> Step 2: I executed " device_del net1", but the net1 still existed.
>>>> In QMP, you get a DEVICE_DELETED event when the unplug completes.
>> See
>>>> qmp/qmp-events.txt.
>>> Actually, I don't get the event, as the net1 can't be unplug.
>>> BTW, when I execute step 1 "device_add virtio-net-pci,id=net1", I don't find
>> the
>>> Ethernet controller of virtio-net by "lspci " in the guest OS.
>>> TBH, the command execution failed despite we can see net1 with "info pci".
>> Sounds like the acpiphp kernel module is not loaded inside the guest?
> OMG, thank you so much. Good catch.

In that case check your /etc/modprobe.conf file in the SLES guest. From
at least SLES 11 SP2 on you should have an entry like this (here SP3):

alias dmi:bvnQEMU:bvrQEMU:* acpiphp

The exact values changed between SeaBIOS versions at some point.


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