[Qemu-devel] Re: qemu-kvm-0.11 regression, crashes on older guests with virtio network

[Michael S. Tsirkin]

On Thu, Oct 29, 2009 at 04:38:22PM +0200, Avi Kivity wrote:
> On 10/29/2009 02:23 PM, Michael S. Tsirkin wrote:
>> On Thu, Oct 29, 2009 at 09:16:43AM +0000, Mark McLoughlin wrote:
>>    
>>> I agree we shouldn't exit in this scenario
>>>      
>> virtio in qemu generally seems to handle guest errors
>> by calling exit(2). This probably makes it easier to notice
>> the problems, but is likely not the right thing to do.
>>    
>
> Right, the thinking was the guest is shooting itself in the foot and  
> hitting, but a guest can delegate control of a device to unprivileged  
> code (for example device assignment in kvm),

When we emulate iommu, yes.

> which would allow this unprivileged code to kill the guest.

With usb emulation, we can have:
drivers/usb/class/usblp.c:343:static const char *usblp_messages[] = {
"ok", "out of paper", "off-line", "on fire" };

> -- 
> error compiling committee.c: too many arguments to function