[Qemu-devel] Re: [PATCH 2/2] qdev: add command line option to set global defaults for properties.

[Gerd Hoffmann <kraxel@redhat.com>]

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On 11/24/09 15:11, Michael S. Tsirkin wrote:
> On Tue, Nov 24, 2009 at 12:06:28PM +0100, Gerd Hoffmann wrote:
>> This patch adds infrastructure and command line option for setting
>> global defaults for device properties, i.e. you can for example use
>>
>>    -global virtio-blk-pci.vectors=0
>>
>> to turn off msi by default for all virtio block devices.  The config
>> file syntax is:
>>
>> [global]
>>    driver = "virtio-blk-pci"
>>    property = "vectors"
>>    value = "0"
>
> Where's this documented?

config file syntax is git-style, the details are not (yet) documented.

Easiest way to get one if you want to play with it is
   "qemu <all-your-vm-options-here> -writeconfig <filename>".

Note that not all command line options are covered.

I've attached a sample to this mail.  Needs a few patches sent to the 
list yesterday and today to actually work though.

> How would one figure out the command lines you give in
> the examples above?

"info qtree" in monitor prints the device names and properties for all 
devices used by the virtual machine.

"info qdm" and '-device ?' list all devices known to qemu.  The device 
properties are not listed there though (one of the items on my todo list).

cheers,
   Gerd

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# qemu config file

# The config file doesn't yet cover all possible options.
#
# minimum command line:
#   qemu -nodefaults -vga cirrus -readconfig $thisfile
#
# you might want to add these switches:
#   -enable-kvm -m <mem> -smp <cpus> -vnc <display> -monitor <chardev>
#
# create a new config file for your guest, for the bits already covered:
#   qemu <tons-of-switches-here> -writeconfig <name>.cfg

#####################################################
# host side configuration

[drive "hda"]
  if = "none"
  file = "/vmdisk/arch-x86.img"

[drive "hdc"]
  if = "none"
  media = "cdrom"

[drive "sda"]
  if = "none"
  file = "/vmdisk/test-lsi-1.img"

[drive "sdb"]
  if = "none"
  file = "/vmdisk/test-lsi-2.img"

[drive "vda"]
  if = "none"
  file = "/vmdisk/test-vio-1.img"

[chardev "ttyS0"]
  backend = "vc"
  cols = "100"
  rows = "50"

[netdev "eth0"]
  type = "user"

#####################################################
# guest devices

[device]
  driver = "ide-drive"
  bus = "ide.0"
  drive = "hda"

[device]
  driver = "ide-drive"
  bus = "ide.1"
  drive = "hdc"

[device]
  driver = "isa-serial"
  chardev = "ttyS0"

[device]
  driver = "e1000"
  netdev = "eth0"
  mac = "52:54:00:78:23:6f"
  addr = "06.0"

[device]
  driver = "AC97"
  addr = "05.0"

[device]
  driver = "virtio-balloon-pci"
  addr = "08.0"

[device]
  driver = "virtio-blk-pci"
  addr = "0c.0"
  drive = "vda"

[device "lsi"]
  driver = "lsi53c895a"
  addr = "0a.0"

[device]
  driver = "scsi-disk"
  bus = "lsi.0"
  scsi-id = "0"
  drive = "sda"

[device]
  driver = "scsi-disk"
  bus = "lsi.0"
  scsi-id = "2"
  drive = "sdb"