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https://github.com/Ponce/slackbuilds
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77 lines
3 KiB
Text
77 lines
3 KiB
Text
kernel-xen.sh: This script builds the Linux Kernel for a Xen Hypervisor.
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Kernel configuration files included here are based on generic Slackware config
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files. For 32bit systems, SMP config was used. To run "make menuconfig" before
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compiling Xen kernel, use:
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MENUCONFIG=yes ./kernel-xen.sh
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Originally, booting Xen kernel with LILO bootloader is not supported, and GRUB
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has to be used. With mbootpack this has changed, and LILO can be used as well.
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Basically, mbootpack takes Linux kernel, initrd and Xen VMM, and packages them
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up into a file that looks like a bzImage Linux kernel. This script will select
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LILO by default, changing to GRUB is easy:
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BOOTLOADER=grub ./kernel-xen.sh
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Slackware generic kernel requires initrd image, this script assumes root is on
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/dev/sda2 and filesystem is ext4, changes are made with:
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ROOTMOD=ext3 ROOTFS=ext3 ROOTDEV=/dev/sda5 ./kernel-xen.sh
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When using LILO bootloader, this is what the lilo.conf should have:
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image = /boot/vmlinuz-xen
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root = /dev/sda2
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label = XenLinux
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append="dom0_mem=512M -- nomodeset"
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read-only
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Everything on the left side of "--" is passed to Xen kernel, and what's on the
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right, goes to Linux kernel.
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When using GRUB, /boot/grub/menu.lst should have these:
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title Slackware XenLinux 14.2
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root (hd0,0)
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kernel /boot/xen.gz dom0_mem=524288 console=vga
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module /boot/vmlinuz-xen root=/dev/sda2 ro console=tty0 nomodeset
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module /boot/initrd-xen.gz
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Booting Xen on a native EFI system is also an option, but the only clean
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solution at this time requires a modified binutils package. More experienced
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user can add "x86_64-pep" to the list of enabled targets and build/replace
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binutils on their system. Subsequently, building Xen will now also create a
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Xen EFI binary.
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To make things a bit easier, a copy of Xen EFI binary can be found here:
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http://slackware.hr/~mario/xen/xen-4.8.1.efi.gz
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If an automatic boot to Xen kernel is desired, the binary should be renamed and
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copied to the following location: /boot/efi/EFI/BOOT/bootx64.efi
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Downloaded binary should be unpacked first, and the config file should be
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present in the same directory (same file name, minus the suffix).
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For example: "xen.cfg" or "bootx64.cfg", and its contents:
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[global]
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default=xen
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[xen]
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options=dom0_mem=min:512M,max:512M,512M
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kernel=vmlinuz-xen root=/dev/sda2 ro console=tty0 nomodeset
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ramdisk=initrd-xen.gz
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There are some other EFI bootloaders, for example ELILO comes with the support
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for VMM images, but their x86 support is lacking. GRUB2 apparently supports
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only the chainloader method; however, the stock Slackware version is too old
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for this task. rEFInd should work, but the Xen EFI method was satisfactory to
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the author :-)
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Troubleshooting dom0 crashes, freezes, blank screen and such:
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* Use /proc/fb to find an out of range device id, for example this can be
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added to Linux kernel: fbcon=map:9
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* Look in dmesg/lsmod for potential framebuffer devices to blacklist
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* Compile Linux kernel with CONFIG_FB=n
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* Use another VGA card :-)
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