Re: [Xen-devel] Dom0 kernel 3.18.10 with CONFIG_HYPERV_STORAGE and Xen 4.5.0 nested inside Hyper-V

[Mark <mark@xxxxxxxxxxxxxxx>]

On 27 March 2015 at 09:48, Jan Beulich <JBeulich@xxxxxxxx> wrote:

>>> On 26.03.15 at 20:37, <mark@xxxxxxxxxxxxxxx> wrote:
> Without Xen, first the disk is deliberately ignored:
>
> [Â Â 3.728055] ata_piix 0000:00:07.1: Hyper-V Virtual Machine detected, ATA
> device ignore set
>
> And later picked up by hv_storevsc:
>
> [Â Â 8.432089] scsi host0: storvsc_host_t
> [  8.432946] scsi 0:0:0:0: Direct-Access  ÂMsft  ÂVirtual Disk
> 1.0Â PQ: 0 ANSI: 4
> [Â Â 8.434538] scsi host1: storvsc_host_t
> [Â Â 8.435324] sd 0:0:0:0: Attached scsi generic sg0 type 0
>
> Any ideas why sda is never attached under Xen or how I can further diagnose
> this?

Perhaps that's a result of the kernel assuming to run on exactly one
kind of hypervisor (i.e. Xen _or_ Hyper-V, but not both layered on
top of each other)?

Jan

Hi Jan,
Are you saying that this isn't going to work by design?
I appreciate it's unusual to have the nested virtualisation.
We're doing this as we have an existing system that uses Xen to hosta number of VMs which is usually installed on physical hardware.
We have had some clients want to install this system inside a virtualmachine on their existing infrastructure. This seems to function fineunder VMware but not Hyper-V.
As requested by Andrew I've attached the xl dmesg output, though I seenothing obvious in it. I built Xen by doing 'make dist debug=y'.Â
What I did notice was that inside the /sys directory tree without Xenthere were lots of files with a file name containing 'vmbus' but veryfew with Xen. So I wonder if something is going wrong with thehv_vmbus driver.
I'm no expert on xen/kernel development but I'm willing to look intothis further if anyone is able to give me any pointers.
Thanks,Â
Mark

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