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Re: [Qemu-devel] Nesting QEMU Question


From: John Snow
Subject: Re: [Qemu-devel] Nesting QEMU Question
Date: Fri, 16 Dec 2016 12:58:31 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1


On 12/14/2016 10:03 PM, Joey Connelly wrote:
> Hey QEMU dev group,
> 
> I have a few questions related to nesting QEMU processes, but first here is
> my system setup:
> 
> 
> 
>    - *HOST MACHINE:* GNU/Linux release 4.5.5 (KVM version follows), Distro
>    Fedora 24, x86_64 arch, supports Intel VT-x, QEMU 2.6.2, libvirt 1.3.3
> 
> 
>    - *GUEST ISO:* GNU/Linux release 2.6.13 (KVM version follows), Distro
>    SliTaz 4.0, i686 32-bit arch, does not appear to support Intel VT-x, QEMU
>    0.12.5, does not have libvirt
> 

I'm not sure what you might mean by a guest OS having KVM and QEMU
packages but not "supporting" VT-x. KVM on Intel platforms _is_ the
support for VT-x.

You might be discovering that when you launch this guest environment
that it does not think your virtual CPU has VT-x, but that's a different
matter. Try searching around for how to enable Nested Virt for KVM.

"by default" this is off, AFAIK:

https://fedoraproject.org/wiki/How_to_enable_nested_virtualization_in_KVM

(Also, QEMU 0.12.5 is practically Precambrian in its age -- I have
massive reservations about your ability to use it to accomplish nested
virt...)

> 
> My question is primarily in response to this comment from your qemu-devel
> threads:
> 
> "qemu-system-x86_64 does not support KVM on a 32-bit host", Daniel Berrange.
> 
> https://lists.nongnu.org/archive/html/qemu-devel/2012-09/msg02186.html
> 
> 
> 
> 
> 
> *[QUESTION#1.]*
> 
> Since my guest OS is 32-bit, do I have to use qemu-system-i386 –enable-kvm
> on my host so that the guest can create a QEMU process of its own
> supporting KVM? Or are there additional qemu-system-i386 arguments I need
> from my host: –cpu <???> -machine <???>
> 
> 
> 
> 
> 
> *[QUESTION#2.]*
> 
> Since my guest OS does not support Intel VT-x, can I force this with
> qemu-system-i386 arguments? I’m not sure how exactly to do this.
> 
> 
> 
> Thanks,
> 
> -Joey
> 



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