Difference between revisions of "User:Renich/Funtoo on KVM/Qemu and Virtio"

Latest revision as of 08:57, June 6, 2014

Warning

This article is still in development

Funtoo is KVM/Qemu ready.

In order for it to work, you need to make sure that you've enabled Virtio support on the kernel.

Pre-Requisites

You are following the Funtoo Linux Installation Guide.
You figured out how to use Genkernel by reading the Genkernel Quick Start Tutorial.
You are using the most current vanilla-sources

Procedure

Carry on until you reach the Configuring and installing the linux kernel section.

Step 1: Install Genkernel

emerge sys-kernel/genkernel

Step 2: Install the vanilla sources

emerge sys-kernel/vanilla-sources

Step 3: Start configuring and building the kernel

genkernel --all-ramdisk-modules --menuconfig all

Step 4: Search and enable the essential Virtio drivers

To be able to search for all Virtio options, just type / on the TUI (Terminal User Interface) and, then, type 'virtio'. Please, consult: KVM's website in order to get a list of options available in the Kernel's config.

Note

The console will let you know what is available. Pay special attention to the location section.

Step 5: Continue with Funtoo Linux Installation Guide

=== Step 6: boot.conf After installing boot-update, edit /etc/boot.conf and make it look something like:

...
"Funtoo Linux genkernel" {
        kernel kernel[-v]
        initrd initramfs[-v]
        params += real_root=auto
        params += real_rootfstype=btrfs
        params += real_rootflags=subvol=root
        params += doload=virtio_pci,virtio_blk,virtio_net
}

Basically, we added some parameters so we ensure our virtual machine boots.

real_rootfstype: This flag helps GRUB determine the fs type.

real_rootflags: This flag adds the BtrFS flags we need in case we used a sub volume for the root fs.

doload: Will take of loading the virtio drivers needed for your image to be functional.

Please, remember to run Boot-Update once you're done.

Testing

Boot the Guest

You should be able to boot the guest without problems. If you're using virt-manager, then just hit "play" on the Guest. If you're a commandline dude, please, issue the following command:

qemu-kvm -boot c -drive file=/var/lib/libvirt/images/funtoo.img,if=virtio -m 512

@@ Line 1: / Line 1: @@
-{{Fancynote | This article is still in development}}
+{{fancywarning | This article is still in development}}
-Funtoo is [[KVM]]/[[wikipedia:Qemu | Qemu]] ready.
+Funtoo is [[KVM]]/[[wikipedia:Qemu|Qemu]] ready.
 In order for it to work, you need to make sure that you've enabled Virtio support on the kernel.
@@ Line 20: / Line 20: @@
 === Step 3: Start configuring and building the kernel ===
-  genkernel --menuconfig all
+  genkernel --all-ramdisk-modules --menuconfig all
 === Step 4: Search and enable the essential Virtio drivers ===
@@ Line 29: / Line 29: @@
 === Step 5: Continue with [[Funtoo_Linux_Installation#Installing_a_Bootloader | Funtoo Linux Installation]] Guide ===
-== Testing ==
+=== Step 6: boot.conf
-=== Boot the Guest ===
+After installing boot-update, edit /etc/boot.conf and make it look something like:
-You should be able to boot the guest without problems. If you're using virt-manager, then just hit "play" on the Guest. If you're a commandline dude, please, issue the following command:
+ ...
+ "Funtoo Linux genkernel" {
+         kernel kernel[-v]
+         initrd initramfs[-v]
+         params += real_root=auto
+         params += real_rootfstype=btrfs
+         params += real_rootflags=subvol=root
+         params += doload=virtio_pci,virtio_blk,virtio_net
+ }
- qemu-kvm -boot c -drive file=/var/lib/libvirt/images/funtoo.img,if=virtio -m 512
+Basically, we added some parameters so we ensure our virtual machine boots.
-== Troubleshooting ==
+;real_rootfstype
+:This flag helps [[wikipedia:GNU_GRUB|GRUB]] determine the fs type.
-=== Determining root device fails ===
+;real_rootflags
-For some reason, on kernel 3.4.5, it fails to load the modules automatically. You can workaround it by adding:
+:This flag adds the [[BTRFS_Fun|BtrFS]] flags we need in case we used a sub volume for the root fs.
- doload=virtio_pci,virtio_blk
+;doload
+: Will take of loading the virtio drivers needed for your image to be functional.
-to the kernel line; at the grub prompt; at boot time. It should look something like this:
+Please, remember to run [[Package:Boot-Update|Boot-Update]] once you're done.
-<pre>
+== Testing ==
-set timeout=3
+=== Boot the Guest ===
-set default=0
+You should be able to boot the guest without problems. If you're using virt-manager, then just hit "play" on the Guest. If you're a commandline dude, please, issue the following command:
-menuentry "Funtoo Linux genkernel - kernel-genkernel-x86_64-3.4.5" {
+ qemu-kvm -boot c -drive file=/var/lib/libvirt/images/funtoo.img,if=virtio -m 512
-  insmod part_gpt
-  insmod ext2
-  set root=(hd0,2)
-  search --no-floppy --fs-uuid --set 22b809f0-86be-422a-8bdd-6f4362da83ed
-  linux /kernel-genkernel-x86_64-3.4.5 real_root=/dev/vda4 doload=virtio_pci,virtio_blk
-  initrd /initramfs-genkernel-x86_64-3.4.5
-  set gfxpayload=keep
-}
-</pre>
-Once you boot, a permanent workaround should look like this:
+== Troubleshooting ==
-<pre>
-mount /dev/vda2 /boot
-cat /boot/grub/grub.cfg
-set timeout=3
-set default=0
-menuentry "Funtoo Linux genkernel - kernel-genkernel-x86_64-3.4.5" {
-  insmod part_gpt
-  insmod ext2
-  insmod virtio_pci
-  insmod virtio_blk
-  insmod virtio_net
-  set root=(hd0,2)
-  search --no-floppy --fs-uuid --set 22b809f0-86be-422a-8bdd-6f4362da83ed
-  linux /kernel-genkernel-x86_64-3.4.5 real_root=/dev/vda4 doload=virtio_pci,virtio_blk
-  initrd /initramfs-genkernel-x86_64-3.4.5
-  set gfxpayload=keep
-}
-</pre>
 == Reference ==