Friday, 11 July 2014

Xen DomU booting process [PV on HVM].


Centos:
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-Kernel loaded with parameter ide0=noprobe[it will prevent disk & NIC emulation, use xen pv drivers].

Linux version 2.6.32-431.el6.x86_64 (mockbuild@c6b8.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Fri Nov 22 03:15:09 UTC 2013
Command line: ro root=UUID=07a30ea1-f06a-44e5-a85a-6e346bb9e3af rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quieti console=ttyS0 ide0=noprobe

E.g.

Netfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated NICs.
Blkfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated disks.

Booting paravirtualized kernel on Xen
NR_CPUS:4096 nr_cpumask_bits:15 nr_cpu_ids:15 nr_node_ids:1

 Xen HVM callback vector for event delivery is enabled

Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)

pci_hotplug: PCI Hot Plug PCI Core version: 0.5
pciehp: PCI Express Hot Plug Controller Driver version: 0.4
acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5


input: Macintosh mouse button emulation as /devices/virtual/input/input2
xvda: xvda1 xvda2 xvda3

 xvda: xvda1 xvda2 xvda3

EXT4-fs (xvda2): INFO: recovery required on readonly filesystem
EXT4-fs (xvda2): write access will be enabled during recovery
EXT4-fs (xvda2): recovery complete
EXT4-fs (xvda2): mounted filesystem with ordered data mode. Opts:
dracut: Mounted root filesystem /dev/xvda2


Welcome to CentOS[screen]

Starting udev: udev: starting version 147

Initialising Xen virtual ethernet driver.

All services are  started.

That's all.










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