virtio & minimal .config

hi there

i've read http://kvm.qumranet.com/kvmwiki/Virtio?highlight=%28virtio%29
about virtio. To test it, i got a new 2.6.25-rc2 kernel and kvm-60 (both on debian).

has anybody out there a minimalistic .config to build a minimal guest kernel image with virtio enabled?

all my tries with virtio ended up with a kernel panic not finding the harddisk... Is virtio for the disk supported by kvm-60 and do i need to enable it on the command line? Without my own virtio enabled kernel things work just fine.

Thanks
- Thomas

PS: maybe a kvm-users mailinglist was more apropriate for this question.

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Quoted 3 lines

has anybody out there a minimalistic .config to build a minimal guest kernel image with virtio enabled?

I usually do a make defconfig, enable the CONFIG_VIRTIO_* options in .config, then do a make oldconfig and answer 'y' to all of the questions.

Quoted 5 lines

all my tries with virtio ended up with a kernel panic not finding the harddisk... Is virtio for the disk supported by kvm-60 and do i need to enable it on the command line? Without my own virtio enabled kernel things work just fine.

Please post your command line for launching KVM. Make sure you have a root parameter like "root=/dev/vda1".

Hi Anthony

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has anybody out there a minimalistic .config to build a minimal guest kernel image with virtio enabled?

I usually do a make defconfig, enable the CONFIG_VIRTIO_* options in .config, then do a make oldconfig and answer 'y' to all of the questions.

ok, i'll give it a try. But "make defconfig" will make a new .config. So i think there won't ever be any 'y' to give to "make oldconfig"?

anyhow. after "make defconfig" there was no "CONFIG_VIRTIO_BLK" in it. But in "make menuconfig" i found and enabled it (also CONFIG_VIRTIO_NIC). (maybe some issues of -rc2)

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all my tries with virtio ended up with a kernel panic not finding the harddisk... Is virtio for the disk supported by kvm-60 and do i need to enable it on the command line? Without my own virtio enabled kernel things work just fine.

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Please post your command line for launching KVM. Make sure you have a root parameter like "root=/dev/vda1".

the "vda1" thing i didn't know. thanks. will also give it a try - tomorrow.

Is "virtio" block device replacing SATA/SCSI - are the SCSI/SATA drivers needed on guest?

thanks
- Thomas

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Please post your command line for launching KVM. Make sure you have a root parameter like "root=/dev/vda1".

the "vda1" thing i didn't know. thanks. will also give it a try - tomorrow.

Quoted 3 lines

Is "virtio" block device replacing SATA/SCSI - are the SCSI/SATA drivers needed on guest?

The virtio block driver should be the only block driver you need in the guest unless you want to give the guest a cdrom (which requires IDE). The virtio block protocol should support everything needed to expose a CDROM to a guest but we haven't implemented backend support for it yet.

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Quoted 5 lines

Please post your command line for launching KVM. Make sure you have a root parameter like "root=/dev/vda1".

the "vda1" thing i didn't know. thanks. will also give it a try - tomorrow.

Quoted 3 lines

Is "virtio" block device replacing SATA/SCSI - are the SCSI/SATA drivers needed on guest?

The virtio block driver should be the only block driver you need in the guest unless you want to give the guest a cdrom (which requires IDE). The virtio block protocol should support everything needed to expose a CDROM to a guest but we haven't implemented backend support for it yet.