Select CPU model (@code{-cpu help} for list and additional feature selection)
ETEXI
+DEF("accel", HAS_ARG, QEMU_OPTION_accel,
+ "-accel [accel=]accelerator[,thread=single|multi]\n"
+ " select accelerator ('-accel help for list')\n"
+ " thread=single|multi (enable multi-threaded TCG)", QEMU_ARCH_ALL)
+STEXI
+@item -accel @var{name}[,prop=@var{value}[,...]]
+@findex -accel
+This is used to enable an accelerator. Depending on the target architecture,
+kvm, xen, or tcg can be available. By default, tcg is used. If there is more
+than one accelerator specified, the next one is used if the previous one fails
+to initialize.
+@table @option
+@item thread=single|multi
+Controls number of TCG threads. When the TCG is multi-threaded there will be one
+thread per vCPU therefor taking advantage of additional host cores. The default
+is to enable multi-threading where both the back-end and front-ends support it and
+no incompatible TCG features have been enabled (e.g. icount/replay).
+@end table
+ETEXI
+
DEF("smp", HAS_ARG, QEMU_OPTION_smp,
"-smp [cpus=]n[,maxcpus=cpus][,cores=cores][,threads=threads][,sockets=sockets]\n"
" set the number of CPUs to 'n' [default=1]\n"
@item -numa node[,mem=@var{size}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}]
@itemx -numa node[,memdev=@var{id}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}]
@findex -numa
-Simulate a multi node NUMA system. If @samp{mem}, @samp{memdev}
-and @samp{cpus} are omitted, resources are split equally. Also, note
-that the -@option{numa} option doesn't allocate any of the specified
-resources. That is, it just assigns existing resources to NUMA nodes. This
-means that one still has to use the @option{-m}, @option{-smp} options
-to allocate RAM and VCPUs respectively, and possibly @option{-object}
-to specify the memory backend for the @samp{memdev} suboption.
+Define a NUMA node and assign RAM and VCPUs to it.
+
+@var{firstcpu} and @var{lastcpu} are CPU indexes. Each
+@samp{cpus} option represent a contiguous range of CPU indexes
+(or a single VCPU if @var{lastcpu} is omitted). A non-contiguous
+set of VCPUs can be represented by providing multiple @samp{cpus}
+options. If @samp{cpus} is omitted on all nodes, VCPUs are automatically
+split between them.
+
+For example, the following option assigns VCPUs 0, 1, 2 and 5 to
+a NUMA node:
+@example
+-numa node,cpus=0-2,cpus=5
+@end example
+
+@samp{mem} assigns a given RAM amount to a node. @samp{memdev}
+assigns RAM from a given memory backend device to a node. If
+@samp{mem} and @samp{memdev} are omitted in all nodes, RAM is
+split equally between them.
+
+@samp{mem} and @samp{memdev} are mutually exclusive. Furthermore,
+if one node uses @samp{memdev}, all of them have to use it.
+
+Note that the -@option{numa} option doesn't allocate any of the
+specified resources, it just assigns existing resources to NUMA
+nodes. This means that one still has to use the @option{-m},
+@option{-smp} options to allocate RAM and VCPUs respectively.
-@samp{mem} and @samp{memdev} are mutually exclusive. Furthermore, if one
-node uses @samp{memdev}, all of them have to use it.
ETEXI
DEF("add-fd", HAS_ARG, QEMU_OPTION_add_fd,
(floppy 1 and 2), c (first hard disk), d (first CD-ROM), n-p (Etherboot
from network adapter 1-4), hard disk boot is the default. To apply a
particular boot order only on the first startup, specify it via
-@option{once}.
+@option{once}. Note that the @option{order} or @option{once} parameter
+should not be used together with the @option{bootindex} property of
+devices, since the firmware implementations normally do not support both
+at the same time.
Interactive boot menus/prompts can be enabled via @option{menu=on} as far
as firmware/BIOS supports them. The default is non-interactive boot.
using @file{/dev/cdrom} as filename (@pxref{host_drives}).
ETEXI
+DEF("blockdev", HAS_ARG, QEMU_OPTION_blockdev,
+ "-blockdev [driver=]driver[,node-name=N][,discard=ignore|unmap]\n"
+ " [,cache.direct=on|off][,cache.no-flush=on|off]\n"
+ " [,read-only=on|off][,detect-zeroes=on|off|unmap]\n"
+ " [,driver specific parameters...]\n"
+ " configure a block backend\n", QEMU_ARCH_ALL)
+
DEF("drive", HAS_ARG, QEMU_OPTION_drive,
"-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]\n"
" [,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off]\n"
qemu-system-i386 -drive if=ide,index=1,media=cdrom
@end example
-You can connect a SCSI disk with unit ID 6 on the bus #0:
-@example
-qemu-system-i386 -drive file=file,if=scsi,bus=0,unit=6
-@end example
-
Instead of @option{-fda}, @option{-fdb}, you can use:
@example
qemu-system-i386 -drive file=file,index=0,if=floppy
DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev,
"-fsdev fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]\n"
- " [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]\n",
+ " [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]\n"
+ " [[,throttling.bps-total=b]|[[,throttling.bps-read=r][,throttling.bps-write=w]]]\n"
+ " [[,throttling.iops-total=i]|[[,throttling.iops-read=r][,throttling.iops-write=w]]]\n"
+ " [[,throttling.bps-total-max=bm]|[[,throttling.bps-read-max=rm][,throttling.bps-write-max=wm]]]\n"
+ " [[,throttling.iops-total-max=im]|[[,throttling.iops-read-max=irm][,throttling.iops-write-max=iwm]]]\n"
+ " [[,throttling.iops-size=is]]\n",
QEMU_ARCH_ALL)
STEXI
" [,streaming-video=[off|all|filter]][,disable-copy-paste]\n"
" [,disable-agent-file-xfer][,agent-mouse=[on|off]]\n"
" [,playback-compression=[on|off]][,seamless-migration=[on|off]]\n"
- " [,gl=[on|off]]\n"
+ " [,gl=[on|off]][,rendernode=<file>]\n"
" enable spice\n"
" at least one of {port, tls-port} is mandatory\n",
QEMU_ARCH_ALL)
@item gl=[on|off]
Enable/disable OpenGL context. Default is off.
+@item rendernode=<file>
+DRM render node for OpenGL rendering. If not specified, it will pick
+the first available. (Since 2.9)
+
@end table
ETEXI
@example
qemu -m 512 -object memory-backend-file,id=mem,size=512M,mem-path=/hugetlbfs,share=on \
-numa node,memdev=mem \
- -chardev socket,path=/path/to/socket \
+ -chardev socket,id=chr0,path=/path/to/socket \
-netdev type=vhost-user,id=net0,chardev=chr0 \
-device virtio-net-pci,netdev=net0
@end example
qemu-system-i386 --drive file=sheepdog://192.0.2.1:30000/MyVirtualMachine
@end example
-See also @url{http://http://www.osrg.net/sheepdog/}.
+See also @url{https://sheepdog.github.io/sheepdog/}.
@item GlusterFS
GlusterFS is a user space distributed file system.
projects / mirror_qemu.git / blobdiff