Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked

[Wen Congyang]

At 03/14/2012 06:52 PM, Avi Kivity Wrote:
> On 03/14/2012 12:52 PM, Wen Congyang wrote:
>>>
>>>> If so, is this channel visible to guest userspace? If the channle is 
>>>> visible to guest
>>>> userspace, the program running in userspace may write the same message to 
>>>> the channel.
>>>
>>> Access control is via permissions.  You can have udev scripts assign
>>> whatever uid and gid to the port of your interest.  By default, all
>>> ports are only accessible to the root user.
>>
>> We should also prevent root user writing message to this channel if it is
>> used for panicked notification.
>>
> 
> Why?  root can easily cause a panic.
> 

root user can write the same message to virtio-serial while the guest is 
running...

Thanks
Wen Congyang