@item snapshot=@var{snapshot}
@var{snapshot} is "on" or "off" and allows to enable snapshot for given drive (see @option{-snapshot}).
@item cache=@var{cache}
-@var{cache} is "on" or "off" and allows to disable host cache to access data.
+@var{cache} is "none", "writeback", or "writethrough" and controls how the host cache is used to access block data.
@item format=@var{format}
Specify which disk @var{format} will be used rather than detecting
the format. Can be used to specifiy format=raw to avoid interpreting
an untrusted format header.
@end table
+By default, writethrough caching is used for all block device. This means that
+the host page cache will be used to read and write data but write notification
+will be sent to the guest only when the data has been reported as written by
+the storage subsystem.
+
+Writeback caching will report data writes as completed as soon as the data is
+present in the host page cache. This is safe as long as you trust your host.
+If your host crashes or loses power, then the guest may experience data
+corruption. When using the @option{-snapshot} option, writeback caching is
+used by default.
+
+The host page can be avoided entirely with @option{cache=none}. This will
+attempt to do disk IO directly to the guests memory. QEMU may still perform
+an internal copy of the data.
+
Instead of @option{-cdrom} you can use:
@example
qemu -drive file=file,index=2,media=cdrom
a suffix of ``M'' or ``G'' can be used to signify a value in megabytes or
gigabytes respectively.
+@item -cpu @var{model}
+Select CPU model (-cpu ? for list and additional feature selection)
+
@item -smp @var{n}
Simulate an SMP system with @var{n} CPUs. On the PC target, up to 255
CPUs are supported. On Sparc32 target, Linux limits the number of usable CPUs
@item sendkey @var{keys}
-Send @var{keys} to the emulator. Use @code{-} to press several keys
-simultaneously. Example:
+Send @var{keys} to the emulator. @var{keys} could be the name of the
+key or @code{#} followed by the raw value in either decimal or hexadecimal
+format. Use @code{-} to press several keys simultaneously. Example:
@example
sendkey ctrl-alt-f1
@end example
to provide high security. The password can be fairly easily brute-forced by
a client making repeat connections. For this reason, a VNC server using password
authentication should be restricted to only listen on the loopback interface
-or UNIX domain sockets. Password ayuthentication is requested with the @code{password}
+or UNIX domain sockets. Password authentication is requested with the @code{password}
option, and then once QEMU is running the password is set with the monitor. Until
the monitor is used to set the password all clients will be rejected.
@node Sparc32 System emulator
@section Sparc32 System emulator
-Use the executable @file{qemu-system-sparc} to simulate a SPARCstation
-5, SPARCstation 10, SPARCstation 20, SPARCserver 600MP (sun4m
-architecture), SPARCstation 2 (sun4c architecture), SPARCserver 1000,
-or SPARCcenter 2000 (sun4d architecture). The emulation is somewhat
-complete. SMP up to 16 CPUs is supported, but Linux limits the number
-of usable CPUs to 4.
+Use the executable @file{qemu-system-sparc} to simulate the following
+Sun4m architecture machines:
+@itemize @minus
+@item
+SPARCstation 4
+@item
+SPARCstation 5
+@item
+SPARCstation 10
+@item
+SPARCstation 20
+@item
+SPARCserver 600MP
+@item
+SPARCstation LX
+@item
+SPARCstation Voyager
+@item
+SPARCclassic
+@item
+SPARCbook
+@end itemize
+
+The emulation is somewhat complete. SMP up to 16 CPUs is supported,
+but Linux limits the number of usable CPUs to 4.
+
+It's also possible to simulate a SPARCstation 2 (sun4c architecture),
+SPARCserver 1000, or SPARCcenter 2000 (sun4d architecture), but these
+emulators are not usable yet.
-QEMU emulates the following sun4m/sun4d peripherals:
+QEMU emulates the following sun4m/sun4c/sun4d peripherals:
@itemize @minus
@item
@item
Lance (Am7990) Ethernet
@item
-Non Volatile RAM M48T08
+Non Volatile RAM M48T02/M48T08
@item
Slave I/O: timers, interrupt controllers, Zilog serial ports, keyboard
and power/reset logic
1275-1994 (referred to as Open Firmware) compliant firmware.
A sample Linux 2.6 series kernel and ram disk image are available on
-the QEMU web site. Please note that currently NetBSD, OpenBSD or
-Solaris kernels don't work.
+the QEMU web site. There are still issues with NetBSD and OpenBSD, but
+some kernel versions work. Please note that currently Solaris kernels
+don't work probably due to interface issues between OpenBIOS and
+Solaris.
@c man begin OPTIONS
-prom-env 'boot-device=sd(0,2,0):d' -prom-env 'boot-args=linux single'
@end example
-@item -M [SS-5|SS-10|SS-20|SS-600MP|SS-2|SS-1000|SS-2000]
+@item -M [SS-4|SS-5|SS-10|SS-20|SS-600MP|LX|Voyager|SPARCClassic|SPARCbook|SS-2|SS-1000|SS-2000]
Set the emulated machine type. Default is SS-5.
@node Sparc64 System emulator
@section Sparc64 System emulator
-Use the executable @file{qemu-system-sparc64} to simulate a Sun4u or
-Sun4v machine. The emulator is not usable for anything yet.
+Use the executable @file{qemu-system-sparc64} to simulate a Sun4u
+(UltraSPARC PC-like machine), Sun4v (T1 PC-like machine), or generic
+Niagara (T1) machine. The emulator is not usable for anything yet, but
+it can launch some kernels.
QEMU emulates the following peripherals:
@item
PCI VGA compatible card with VESA Bochs Extensions
@item
+PS/2 mouse and keyboard
+@item
Non Volatile RAM M48T59
@item
PC-compatible serial ports
@item
2 PCI IDE interfaces with hard disk and CD-ROM support
+@item
+Floppy disk
@end itemize
@c man begin OPTIONS
@table @option
-@item -M [sun4u|sun4v]
+@item -prom-env string
+
+Set OpenBIOS variables in NVRAM, for example:
+
+@example
+qemu-system-sparc64 -prom-env 'auto-boot?=false'
+@end example
+
+@item -M [sun4u|sun4v|Niagara]
Set the emulated machine type. The default is sun4u.
@subsection Command line options
@example
-usage: qemu-i386 [-h] [-d] [-L path] [-s size] program [arguments...]
+usage: qemu-i386 [-h] [-d] [-L path] [-s size] [-cpu model] [-g port] program [arguments...]
@end example
@table @option
Set the x86 elf interpreter prefix (default=/usr/local/qemu-i386)
@item -s size
Set the x86 stack size in bytes (default=524288)
+@item -cpu model
+Select CPU model (-cpu ? for list and additional feature selection)
@end table
Debug options:
Activate log (logfile=/tmp/qemu.log)
@item -p pagesize
Act as if the host page size was 'pagesize' bytes
+@item -g port
+Wait gdb connection to port
@end table
Environment variables:
The binary format is detected automatically.
+@command{qemu-sparc} can execute Sparc32 binaries (Sparc32 CPU, 32 bit ABI).
+
@command{qemu-sparc32plus} can execute Sparc32 and SPARC32PLUS binaries
(Sparc64 CPU, 32 bit ABI).
projects / mirror_qemu.git / blobdiff