- #QEMU COMMAND LINE SERIAL NUMBER#
- #QEMU COMMAND LINE DRIVERS#
- #QEMU COMMAND LINE PC#
- #QEMU COMMAND LINE WINDOWS#
In case you don't care about data integrity over host failures, use cache=unsafe. If performance is more important than correctness,Ĭache=writeback should be used with qcow2.
#QEMU COMMAND LINE DRIVERS#
Some block drivers perform badly with cache=writethrough, most notably, qcow2.
QEMU may still perform an internal copy of the data. This will attempt to do disk IO directly to the guests memory. The host page cache can be avoided entirely with cache=none. When using the -snapshot option, writeback caching is used by If your host crashes or loses power, then the guest may experience data corruption. This is safe as long as you trust your host. Writeback caching will report data writes as completed as soon as the data is present in the host page cache. Notification will be sent to the guest only when the data has been reported as written by the storage subsystem. This means that the host page cache will be used to read and write data but write
#QEMU COMMAND LINE SERIAL NUMBER#
Serial= serial This option specifies the serial number to assign to the device.Īddr= addr Specify the controller's PCI address (if=virtio only).Ĭopy-on-read= copy-on-read copy-on-read is "on" or "off" and enables whether to copy read backing file sectors into the image file.īy default, writethrough caching is used for all block device. Can be used to specifiy format=raw to avoid interpreting an untrusted format įormat= format Specify which disk format will be used rather than detecting the format. Snapshot= snapshot snapshot is "on" or "off" and allows to enable snapshot for given drive (see -snapshot).Ĭache= cache cache is "none", "writeback", "unsafe", or "writethrough" and controls how the host cache is used to access block data.Īio= aio aio is "threads", or "native" and selects between pthread based disk I/O and native Linux AIO. Media= media This option defines the type of the media: disk or cdrom.Ĭyls= c ,heads= h ,secs= s These options have the same definition as they have in -hdachs. Index= index This option defines where is connected the drive by using an index in the list of available connectors of a given interface type.
Available types are: ide, scsi, sd, mtd, floppy, pflash, virtio.īus= bus ,unit= unit These options define where is connected the drive by defining the bus number and the unit id. If= interface This option defines on which type on interface the drive is connected. If the filename contains comma, you must double it (for instance, "file=my,file" to use file Valid options are:įile= file This option defines which disk image to use with this drive. You can use the host CD-ROM by using /dev/cdrom as cdrom file Use file as CD-ROM image (you cannot use -hdc and -cdrom at the same time). hda file -hdb file -hdc file -hdd file Use file as hard disk 0, 1, 2 or 3 image. You can use the host floppy by using /dev/fd0 as filename. fda file -fdb file Use file as floppy disk 0/1 image. If mem and cpus are omitted, resources are split equally. numa opts Simulate a multi node NUMA system. maxcpus specifies the maximum number of hotpluggable CPUs. If any on the three values is given, the total number of CPUs n can be
#QEMU COMMAND LINE PC#
For the PC target, the number of cores per socket, the number of threads per cores and the total On the PC target, up to 255 CPUs are supported. smp n Simulate an SMP system with n CPUs. cpu model Select CPU model (-cpu ? for list and additional feature selection) M machine Select the emulated machine ( "-M ?" for list) version Display version information and exit
#QEMU COMMAND LINE WINDOWS#
ĬS4231A is the chip used in Windows Sound System and GUSMAX productsĭisk_image is a raw hard disk image for IDE hard disk 0. Qemu dos.img -device gus,irq=5Or some other unclaimed IRQ. Have working GUS qemu dos.img -soundhw gus -parallel noneAlternatively: Not that, by default, GUS shares IRQ (7) with parallel ports and so qemu must be told to not have parallel ports to QEMU uses GUS emulation( GUSEMU32 ) by Tibor " QEMU uses YM3812 emulation by Tatsuyuki Satoh. QEMU uses the PC BIOS from the Bochs project and the Plex86/Bochs LGPL VGA BIOS. Note that adlib, gus and cs4231a are only available when QEMU was configured with -audio-card-list option containing the name(s) of required PCI UHCI USB controller and a virtual USB hub. Intel 82801AA AC97 Audio compatible sound cardĪdlib( OPL2 ) - Yamaha YM3812 compatible chip I440FX host PCI bridge and PIIX3 PCI to ISA bridgeĬirrus CLGD 5446 PCI VGA card or dummy VGA card with Bochs VESA extensions (hardware level,Ģ PCI IDE interfaces with hard disk and CD-ROM support The QEMU PC System emulator simulates the following peripherals: