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

[Gleb Natapov]

On Wed, Mar 14, 2012 at 06:58:47PM +0800, Wen Congyang wrote:
> 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...
> 
So what?

--
                        Gleb.