Re: Hot-adding disk on VM

[Daniel Bareiro <daniel-listas@gmx.net>]

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Hi, Dustin.

On Sunday, 11 October 2009 21:25:19 -0500,
Dustin Kirkland wrote:

> >> According to I see in this document [1], is necessary that is loaded
> >> two modules in the guest: acpiphp and pci_hotplug.
> >>
> >> The pci_hotplug module is loaded. Nevertheless, in spite of existing
> >> the acpiphp module, cannot be loaded:
> >>
> >> chandra:~# lsmod|grep pci_hotplug
> >> pci_hotplug            23460  0
> >>
> >> chandra:~# modprobe acpiphp
> >> FATAL: Error inserting acpiphp
> >> (/lib/modules/2.6.26-2-686/kernel/drivers/pci/hotplug/acpiphp.ko): No such device
> >>
> >> chandra:~# locate acpiphp | grep 686
> >> /lib/modules/2.6.26-2-686/kernel/drivers/pci/hotplug/acpiphp.ko
> >> /lib/modules/2.6.26-2-686/kernel/drivers/pci/hotplug/acpiphp_ibm.ko
> >>
> >>
> >> Which could be being the problem?
> >
> > I was doing other tests this time with Linux 2.6.31.2 compiled by myself
> > from the sources of kernel.org. This time with loading the acpiphp
> > module, the pci_hotplug module was loaded automatically without I get
> > some type of error message.
> >
> > central:~# lsmod | grep acpiphp
> > central:~#
> > central:~# modprobe acpiphp
> > central:~#
> > central:~# lsmod | grep acpiphp
> > acpiphp                22140  0
> > pci_hotplug            29024  1 acpiphp
> >
> >
> > Then, I tried to add a disk of the following way in host:
> >
> > (qemu) pci_add auto storage file=/dev/vm/central-test,if=virtio
> > OK domain 0, bus 0, slot 5, function 0
> >
> > In the guest:
> >
> > Oct 11 18:09:01 central kernel: [  833.403875] pci 0000:00:02.0: BAR 6: bogus alignment [0x0-0x0] flags 0x2
> > Oct 11 18:09:01 central kernel: [  833.406337] decode_hpp: Could not get hotplug parameters. Use defaults
> > Oct 11 18:09:01 central kernel: [  833.430492] virtio-pci 0000:00:05.0: enabling device (0000 -> 0001)
> > Oct 11 18:09:01 central kernel: [  833.452268] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 10
> > Oct 11 18:09:01 central kernel: [  833.454668] virtio-pci 0000:00:05.0: PCI INT A -> Link[LNKA] -> GSI 10 (level, high) -> IRQ 10
> > Oct 11 18:09:01 central kernel: [  833.500051] Clocksource tsc unstable (delta = -148257950 ns)
> > Oct 11 18:09:01 central kernel: [  833.566755]  vda: vda1
> >
> >
> > Then I attempt to remove the device assuring previously that it is not
> > being used in guest:
> >
> > (qemu) pci_del 5
> >
> >
> > In the guest:
> >
> > Oct 11 18:13:32 central kernel: [ 1104.144179] virtio-pci 0000:00:05.0: PCI INT A disabled
> >
> >
> > But if I want to add the device again, I get a segmentation fault of the
> > process that handles this virtual machine:
> >
> > (qemu) pci_add auto storage file=/dev/vm/central-test,if=virtio
> > Connection closed by foreign host.
 
> I can actually confirm this behavior.  I've been struggling with this
> for a couple of days now.  CC'ing QEMU, as I've discussed this a bit
> with Anthony Liguori.  There's at least two related bugs we've been
> tracking:

>  * https://bugs.edge.launchpad.net/ubuntu/+source/qemu-kvm/+bug/432154
>  * https://bugs.edge.launchpad.net/ubuntu/+source/qemu-kvm/+bug/419590

According to I see in Launchpad, there is a fix released for Qemu and
qemu-kvm (Ubuntu).

I'm using KVM-88 compiled from the source code obtained of the KVM
official site. How I could apply these fix? There is some KVM version
that includes these corrections in the official site?

Thanks for your reply.

Regards,
Daniel
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