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

[Mark <mark@xxxxxxxxxxxxxxx>]

Hi,

We're trying to nest virtualisation using 64bit Xen inside a Hyper-V virtual machine.Â

When we enable CONFIG_HYPERV_STORAGE and boot with the Xen hypervisor

we can't see /dev/sda. If we boot the Linux kernel without Xen it works fine.Â

The full dmesg for booting with and without Xen is attached.

Without Xen, first the disk is deliberately ignored:Â

[ Â Â3.728055] ata_piix 0000:00:07.1: Hyper-V Virtual Machine detected, ATA device ignore set

And later picked up by hv_storevsc:Â

[ Â Â8.432089] scsi host0: storvsc_host_t

[  Â8.432946] scsi 0:0:0:0: Direct-Access   Msft   Virtual Disk   1.0 ÂPQ: 0 ANSI: 4

[ Â Â8.434538] scsi host1: storvsc_host_t

[ Â Â8.435324] 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?

Thanks,Â

Mark

Attachment: dmesg-without-xen.log
Description: Text Data

Attachment: dmesg-with-xen.log
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