mirror of
https://github.com/xen-project/xen.git
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Keir Fraser
a2c7db64f5
This fetches GRUB1 sources, applies the {graphical, print function,
save default, and ext3_256byte} patches from debian, and applies a
patch to make it work on x86_64 and port it to Mini-OS. By using
libxc, PV-GRUB can then "kexec" the loaded kernel from inside the
domain itself, hence permitting to avoid the security-concerned
pygrub.
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
137 lines
3.2 KiB
Plaintext
137 lines
3.2 KiB
Plaintext
To compile
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==========
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Just run make -j 4, that will download / patch / compile
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Then make install to install the result.
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Also, run make and make install in $XEN_ROOT/tools/fs-back
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IOEMU stubdom
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=============
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This boosts HVM performance by putting ioemu in its own lightweight domain.
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General Configuration
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=====================
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In your HVM config "hvmconfig",
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- use /usr/lib/xen/bin/stubdom-dm as dm script:
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device_model = '/usr/lib/xen/bin/stubdom-dm'
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- comment the disk statement:
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#disk = [ 'file:/tmp/install.iso,hdc:cdrom,r', 'phy:/dev/sda6,hda,w', 'file:/tmp/test,hdb,r' ]
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- disable anything related to dom0, like pty serial assignments
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Create /etc/xen/stubdom-hvmconfig (where "hvmconfig" is the name of your HVM
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guest) with
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kernel = "/usr/lib/xen/boot/ioemu-stubdom.gz"
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vif = [ '', 'ip=10.0.1.1,mac=aa:00:00:12:23:34']
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disk = [ 'file:/tmp/install.iso,hdc:cdrom,r', 'phy:/dev/sda6,hda,w', 'file:/tmp/test,hdb,r' ]
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where
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- the first vif ('') is reserved for VNC (see below)
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- 'ip=10.0.1.1,mac= etc...' is the same net configuration as in the hvmconfig
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script,
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- and disk = is the same block configuration as in the hvmconfig script.
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Display Configuration
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=====================
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There are three posibilities
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* Using SDL
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- In hvmconfig, disable vnc and sdl:
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vnc = 0
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sdl = 0
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- In stubdom-hvmconfig, set an sdl vfb:
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vfb = [ 'type=sdl' ]
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* Using a VNC server in the stub domain
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- In hvmconfig, set vnclisten to "172.30.206.1" for instance. Do not use a
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host name as Mini-OS does not have a name resolver. Do not use 127.0.0.1 since
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then you will not be able to connect to it.
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vnc = 1
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vnclisten = "172.30.206.1"
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- In stubdom-hvmconfig, fill the reserved vif with the same IP, for instance:
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vif = [ 'ip=172.30.206.1', 'ip=10.0.1.1,mac=aa:00:00:12:23:34']
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* Using a VNC server in dom0
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- In hvmconfig, disable vnc and sdl:
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vnc = 0
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sdl = 0
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- In stubdom-hvmconfig, set a vnc vfb:
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vfb = [ 'type=vnc' ]
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and any other parameter as wished.
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To run
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======
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mkdir -p /exports/usr/share/qemu
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ln -s /usr/share/qemu/keymaps /exports/usr/share/qemu
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mkdir -p /exports/var/lib
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ln -s /var/lib/xen /exports/var/lib
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/usr/sbin/fs-backend &
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xm create hvmconfig
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PV-GRUB
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=======
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This replaces pygrub to boot domU images safely: it runs the regular grub
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inside the created domain itself and uses regular domU facilities to read the
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disk / fetch files from network etc. ; it eventually loads the PV kernel and
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chain-boots it.
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Configuration
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=============
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In your PV config,
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- use /usr/lib/xen/boot/pv-grub.gz as kernel:
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kernel = "/usr/lib/xen/boot/pv-grub.gz"
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- set the path to menu.lst, as seen from the domU, in extra:
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extra = "(hd0,0)/boot/grub/menu.lst"
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you can also use a tftp path (dhcp will be automatically performed):
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extra = "(nd)/somepath/menu.lst"
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or you can set it in option 150 of your dhcp server and leave extra empty
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Limitations
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===========
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- You can not boot a 64bit kernel with a 32bit-compiled PV-GRUB and vice-versa.
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To cross-compile a 32bit PV-GRUB,
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export XEN_TARGET_ARCH=x86_32
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- bootsplash is supported, but the ioemu backend does not yet support restart
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for use by the booted kernel.
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