Re: [libvirt] pvpanic device should not be automatically included as an internal device

On 08/01/2013 04:23 PM, Paolo Bonzini wrote: >> Automatic devices with no command line argument have proven to be a >> nightmare for libvirt as well. Although the just-released libvirt 1.1.1 >> now supports the <on_crash> element for controlling the command line >> parameters of qemu related to how qemu will behave when the pvpanic >> device is triggered, I would also welcome having the ability to control >> whether the guest even has a pvpanic device exposed, just as we can >> control whether a guest has a memballoon device exposed. > > This is quite different from memballoon. > > pvpanic is a single I/O port, it doesn't use up a PCI slot (thus > causing conflicts with other devices at the same address). > > Perhaps this issue is simply fixed by making the _STA method > return 0x0B instead of 0x0F (i.e. turning off the "show in user > interface" bit). That may "fix" the issue of a windows guest showing the yellow ! mark, but what if, down the road, someone writes an actual windows driver that is aware of that port and how to make a windows BSOD write a panic notification to the port? How does a user go about installing such a driver if the device is not exposed in the user interface list of devices?