Bug 444155 - mkinitrd: support booting from KVM virtio devices
mkinitrd: support booting from KVM virtio devices
Product: Fedora
Classification: Fedora
Component: mkinitrd (Show other bugs)
All Linux
low Severity low
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Assigned To: Peter Jones
Fedora Extras Quality Assurance
Depends On:
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Reported: 2008-04-25 10:21 EDT by Mark McLoughlin
Modified: 2009-06-10 03:50 EDT (History)
4 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2009-06-10 03:50:47 EDT
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
0001-mkinitrd-handle-KVM-virtio-devices.patch (1.01 KB, patch)
2008-04-25 10:21 EDT, Mark McLoughlin
no flags Details | Diff

  None (edit)
Description Mark McLoughlin 2008-04-25 10:21:01 EDT
If you run kvm-qemu with e.g. --drive if=virtio,boot=on,file=foo.img then the
guest must use the KVM virtio drivers to mount the root device.

KVM exposes its virtio devices to the guest over PCI, requiring the guest to use
the virtio_pci driver for device enumeration. The actual block device driver is

Currently, if you boot using virtio and then try and create new initrd, the
initrd will include virtio_blk, but not virtio_net.

virtio_blk is to virtio_pci as standard disk drives is to the core PCI code, and
as virtio_blk is to lguest's device enumeration code and as xen_blkfront is to

Where virtio_pci differs from the others, though, is that it's a module and not
built in.
Comment 1 Mark McLoughlin 2008-04-25 10:21:01 EDT
Created attachment 303790 [details]
Comment 2 Mark McLoughlin 2008-04-25 10:38:41 EDT
(In reply to comment #0)

> Currently, if you boot using virtio and then try and create new initrd, the
> initrd will include virtio_blk, but not virtio_net.

... "but not virtio_pci" is what I meant
Comment 3 Jeremy Katz 2008-04-25 11:27:23 EDT
Applied and building for F9
Comment 4 Mark McLoughlin 2008-04-25 13:26:44 EDT
Just to be sure, I tried a kvm virtio install without this fix and it failed to
boot after the install because virtio_pci wasn't loaded

Tried again with the fix and it works fine
Comment 5 Bug Zapper 2008-05-14 06:09:26 EDT
Changing version to '9' as part of upcoming Fedora 9 GA.
More information and reason for this action is here:
Comment 6 Bug Zapper 2009-06-09 20:26:23 EDT
This message is a reminder that Fedora 9 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 9.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
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Comment 7 Mark McLoughlin 2009-06-10 03:50:47 EDT
Long since fixed

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