Public bug reported:
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In working on the ec2/uec ramdisk-less boot [1] I recently verified that
the -virtual kernel has sufficient disk drivers to boot on hardware
presented by UEC.
I'd like to request that we have driver support built in to -virtual for
the other reasonable kvm interfaces. kvm man page shows the following as
options for '-drive if=':
ide, scsi, sd, mtd, floppy, pflash, virtio.
I quickly tested vmlinuz-2.6.32-7-server kernel for amd64 and found:
- - [X] kvm if=ide (this is the same as '-hda <file>')
- - [ ] kvm if=scsi (used by eucalyptus)
- - [ ] kvm if=sd
- - [ ] kvm if=mtd
- - [ ] kvm if=floppy
- - [ ] kvm if=pflash
- - [ ] kvm if=virtio
The 'X' marks success. I previously believed 'scsi' to have worked, but
couldn't get it to function today. Of the list above, the ones that I
think are 'reasonable' or relavant are:
ide
scsi
virtio
To test, I had disk.img.dist as a root filesystem that would boot. Then:
$ qemu-img create -f qcow2 -b disk.img.dist disk.img
$ kvm -drive file=disk.img,bus=0,index=0,if=${iface} \
-kernel lucid-uec-amd64-vmlinuz-virtual \
-append "quiet nosplash single"
Note: I'm not certain on the correctness of 'bus=0,index=0' or
effectiveness for all drivers.
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[1] https://wiki.ubuntu.com/ServerLucidCloudKernelRamdisk
affects ubuntu/linux
assignee jjohansen
importance low
subscribe smoser
subscribe kirkland
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** Affects: linux (Ubuntu)
Importance: Low
Assignee: John Johansen (jjohansen)
Status: New
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support ramdiskless boot for relavant kvm drive interfaces in -virtual
https://bugs.launchpad.net/bugs/494565
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