Il 10/03/2014 13:45, Alexey Kardashevskiy ha scritto:
As I was told in this list before, even with -nodefaults, QEMU should not
create a machine which is known for not working or not being supported.
Having VGA and not having any input device is kind of such a config, no?
-nodefaults is exactly the opposite of that: no magic whatsoever. No VGA,
no serial, nothing.
qemu-system-x86_64 -enable-kvm -nographic -nodefaults -monitor stdio
"info qtree" shows a whole bunch of devices like "i440FX-pcihost",
"isa-fdc", "piix3-ide", "vmmouse", "vmport" (what are the last two?). I was
told here that 8042 is to emulate A20, ok, but others - I do not really
understand. "q35" is bit different than "pc" but not smaller. The point was
made that there is no point in emulating a machine which does not exist in
the real world. Has it changed recently?
-nodefaults should be the bare minimum that is necessary for the VM
firmware to work. On x86, isa-fdc/vmmouse/vmport are there only for
backwards compatibility reasons.
And especially, with -nodefaults adding a VGA means just that: adding a VGA.
Usual issue - libvirt expects keyboard with VGA and x86 provides this as it
always has keyboard. PPC does not have such default.
I don't think it's even a libvirt bug. Then in the libvirt XML you
should have:
<devices>
<input type='keyboard' bus='usb'/>
</devices>
explicitly. If libvirt uses -nodefaults, it's up to virt-manager or
oVirt or whatever management layer you're using to add all the necessary
controllers (USB in this case) and devices (keyboard) for the machine to
be usable.
Paolo
