xen boot arguments

gxy_0202

Xen systems are typically booted with GrUB. The GrUB
"kernel" is Xen itself. The kernel image for domain 0 is given to grub
as the first "module". An initrd for domain 0, if required, is
specified as a further module. A number of options can be passed to Xen
on the command line.

For an up-to-date list see the
user manual
. Options available on version 3.0 are (with examples for common options):

   Parameter
   Description
   Default
   dom0_mem=131072
   Initial domain 0 memory allocation in kBytes
   16000kBytes
   mem=131072
   Set the physical RAM address limit. (beyond is ignored)
   16000kBytes
   dom0_vcpus_pin
   Pins domain 0 VCPUs on their respective
   
   com1=115200,8n1 com2=
  
Serial console details for Xen (Linux will need its own serial console
configuration if required). Format is
,DPS,,.
   
   console=com1
   Comma-separated list of console outputs (see also
xencons=
)
   com1,vga
   sync_console
   Force synchronous console output.
   async, except on major errors
   vga=text-80x50
   VGA console mode and options  
   vga=text-80x25
   conswitch
   Specify how to switch serial-console input between Xen and DOM0.  
   Ctrl-A three times|
   noacpi
   ACPI tables are not parsed
   Tables are parsed
   noreboot
  Don't reboot the machine automatically on errors.
   reboot on errors
   nosmp
   Disables secondary processors
   SMP Enabled
   ignorebiostables
   ACPI and MP tables are ignored (implies noacpi, nosmp)
   Tables are parsed
   watchdog
   Run a watchdog NMI on each processor
   Not run
   physdev_dom0_hide=
   List of PCI slots to hide from domain 0, Format is '(%02x:%02x.%1x)(%02x:%02x.%1x)' and so on.
   
   badpage=
   Comma-separated list of hexadecimal page numbers containing bad bytes. e.g. 'badpage=0x3f45,0x8a321'
   
   sched=bvt
   Scheduler - see Users' Manual
   sched=credit
   leveltrigger=
   Force an IO-APIC-routed IRQ to be level-triggered. Example: 'leveltrigger=4,5,6,20 edgetrigger=21'
   
   edgetrigger=
   Force an IO-APIC-routed IRQ to be edge-triggered. Example: 'leveltrigger=4,5,6,20 edgetrigger=21'
   
   nmi=
   One of: fatal:  Xen prints diagnostic message and then hangs. dom0:   The NMI is virtualised to DOM0. ignore: The NMI error is cleared and ignored.
   dom0
   pbd=
   Name of serial port for Xen pervasive debugger (and enable pdb)
   Disabled
   conswitch=a
  
A character pair controlling console switching. CTRL+ is
used to switch console input between Xen and DOM0. Char 2: If this
character is 'x', then do not auto-switch to DOM0 when it boots. Any
other value, or omitting the char, enables auto-switch
   a
   tbuf_size=
   Trace buffer size (in pages)
   10
   xenheap_megabytes=
   x86-64 only. Size of Xen heap in megabytes, excluding the pfn_info table and allocation bitmap
   defined: XENHEAP_DEFAULT_MB as 16
   noirqbalance
   Disable software IRQ balancing and affinity.
   
   apic_verbosity
   Print more detailed information about local APIC and IOAPIC
   
   lapic / nolapic
   Force / Ignore use of local APIC
   auto
   apic
   Specify NUMA platform...
   
   Old options (version 2.0)
  noht
   Disables Hyper-Threading
   HT Enabled
XenLinux Boot Options :
In addition to the standard Linux kernel boot options, we support:  
* `xencons=tty'  Read
http://www.cl.cam.ac.uk/research/srg/netos/xen/readmes/user/user.html
's
XenLinux
Boot Options
               
               
               

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