From owner-freebsd-virtualization@freebsd.org  Mon Aug 17 13:41:22 2015
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From: Bart Derda <bede@bsd.scene.pl>
Subject: Re: 10.2-RELEASE guest in Hyper-V boot failed.
Date: Mon, 17 Aug 2015 13:37:53 +0000 (UTC)
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hshh <hunreal@...> writes:

> 
> After upgrade to 10.2-RELEASE from 10.1, my FreeBSD guest hang on boot.
> Kernel can not find out rootfs.
> All daX devices size is 0MB !!
> Someone has this issue too,
> https://forums.freebsd.org/threads/10-2-cant-see-hdd-on-hyper-v-2k8r2.52797/


I had the same situations - I checked LINT file and added "options HYPERV"
to my (10.1) kernel config - after that everything is ok.