In the general case, the guest device is connected to a controller
device. For instance, the IDE controller provides two IDE buses, each
-of which can have up to two ide-drive devices, and each ide-drive
-device is a guest part, and is connected to a host part.
+of which can have up to two devices, and each device is a guest part,
+and is connected to a host part.
Except we sometimes lump controller, bus(es) and drive device(s) all
together into a single device. For instance, the ISA floppy
* if=floppy
- -global isa-fdc.driveA=DRIVE-ID
- -global isa-fdc.driveB=DRIVE-ID
+ -device floppy,unit=UNIT,drive=DRIVE-ID
- This is -global instead of -device, because the floppy controller is
- created automatically, and we want to configure that one, not create
- a second one (which isn't possible anyway).
-
- Without any -global isa-fdc,... you get an empty driveA and no
- driveB. You can use -nodefaults to suppress the default driveA, see
+ Without any -device floppy,... you get an empty unit 0 and no unit
+ 1. You can use -nodefaults to suppress the default unit 0, see
"Default Devices".
* if=virtio
* if=pflash, if=mtd, if=sd, if=xen are not yet available with -device
-For USB devices, the old way is actually different:
+For USB devices, the old way was actually different:
-usbdevice disk:format=FMT:FILENAME
-Provides much less control than -drive's OPTS... The new way fixes
-that:
+"Was" because "disk:" is gone since v2.12.0.
+
+The old way provided much less control than -drive's OPTS... The new
+way fixes that:
-device usb-storage,drive=DRIVE-ID,removable=RMB
This lets you control I/O ports and IRQs.
-* -usbdevice serial::chardev becomes -device usb-serial,chardev=dev.
-
* -usbdevice braille doesn't support LEGACY-CHARDEV syntax. It always
uses "braille". With -device, this useful default is gone, so you
have to use something like
-device usb-braille,chardev=braille -chardev braille,id=braille
-* -virtioconsole becomes
- -device virtio-serial-pci,class=C,vectors=V,ioeventfd=IOEVENTFD,max_ports=N
- -device virtconsole,is_console=NUM,nr=NR,name=NAME
+* -usbdevice serial::chardev is gone since v2.12.0. It became
+ -device usb-serial,chardev=dev.
LEGACY-CHARDEV translates to -chardev HOST-OPTS... as follows:
-net nic,netdev=NET-ID,macaddr=MACADDR,model=MODEL,name=ID,addr=STR,vectors=V
-Except for USB it looks like this:
+Except for USB it looked like this:
-usbdevice net:netdev=NET-ID,macaddr=MACADDR,name=ID
+"Looked" because "net:" is gone since v2.12.0.
+
The new way is -device:
-device DEVNAME,netdev=NET-ID,mac=MACADDR,DEV-OPTS...
Some PCI devices aren't available with -net nic, e.g. i82558a.
-To connect to a VLAN instead of an ordinary host part, replace
-netdev=NET-ID by vlan=VLAN.
-
=== Graphics Devices ===
Host and guest part of graphics devices have always been separate.
* mouse -device usb-mouse
* tablet -device usb-tablet
* wacom-tablet -device usb-wacom-tablet
+* u2f -device u2f-{emulated,passthru}
+* braille See "Character Devices"
+
+Until v2.12.0, we additionally had
+
* host:... See "Host Device Assignment"
* disk:... See "Block Devices"
* serial:... See "Character Devices"
-* braille See "Character Devices"
* net:... See "Network Devices"
-* bt:... not yet available with -device
=== Watchdog Devices ===
=== Host Device Assignment ===
QEMU supports assigning host PCI devices (qemu-kvm only at this time)
-and host USB devices.
-
-The old way to assign a host PCI device is
-
- -pcidevice host=ADDR,dma=none,id=ID
-
-The new way is
-
- -device pci-assign,host=ADDR,iommu=IOMMU,id=ID
+and host USB devices. PCI devices can only be assigned with -device:
-The old dma=none becomes iommu=off with -device.
+ -device vfio-pci,host=ADDR,id=ID
-The old way to assign a host USB device is
+The old way to assign a USB host device
-usbdevice host:auto:BUS.ADDR:VID:PRID
-where any of BUS, ADDR, VID, PRID can be the wildcard *.
+was removed in v2.12.0. Any of BUS, ADDR, VID, PRID could be the
+wildcard *.
The new way is
-device usb-host,hostbus=BUS,hostaddr=ADDR,vendorid=VID,productid=PRID
-Omitted options match anything, just like the old way's wildcard.
+Omitted options match anything.
=== Default Devices ===
some DEVNAMEs:
default device suppressing DEVNAMEs
- CD-ROM ide-cd, ide-drive, scsi-cd
- isa-fdc's driveA isa-fdc
+ CD-ROM ide-cd, ide-hd, scsi-cd, scsi-hd
+ floppy floppy, isa-fdc
parallel isa-parallel
serial isa-serial
- VGA VGA, cirrus-vga, vmware-svga
- virtioconsole virtio-serial-pci, virtio-serial-s390, virtio-serial
+ VGA VGA, cirrus-vga, isa-vga, isa-cirrus-vga,
+ vmware-svga, qxl-vga, virtio-vga, ati-vga,
+ vhost-user-vga
The default NIC is connected to a default part created along with it.
It is *not* suppressed by configuring a NIC with -device (you may call
projects / mirror_qemu.git / blobdiff