Freeze with KVM_CLOCK, undocumented dependency VIRTIO_BLK -> VIRTIO_PCI

[Bernhard Schmidt <berni@birkenwald.de>]

Hi,

apologies if those questions have already been answered, I did not find
anything specific that should still be visible.

I'm currently testing KVM (kvm-0.70 package from Debian unstable,
rebuilt on Ubuntu Hardy) on a Athlon64 in i386 mode and found two small
issues while trying to build a small kernel for my guest systems
(2.6.26-rc6).

a) when I enable KVM_CLOCK in the kernel configuration the guest system
freezes after

PCI: Found IRQ 11 for device 0000:00:04.0
 vda: vda1 vda2
TCP cubic registered
NET: Registered protocol family 10
NET: Registered protocol family 17
Using IPI Shortcut mode

when I disable KVM_CLOCK it mounts the filesystem and boots just fine

Using IPI Shortcut mode
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.

b) apparently VIRTIO_BLK works only when VIRTIO_PCI and thus PCI is
enabled in the kernel. Otherwise the vda* device is not visible and the
guest does not find its root filesystem.

Is this expected? If yes, is it possible to add the appropriate
dependency in the kernel configuration or amend the description
accordingly?

Thanks,
Bernhard