linux-kernel - Re: [Xen-devel] KVM PV

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Date:   Mon, 2 Oct 2017 14:17:54 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     George Dunlap <george.dunlap@...rix.com>
Cc:     Lai Jiangshan <jiangshanlai+lkml@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Rusty Russell <rusty@...tcorp.com.au>, lguest@...ts.ozlabs.org,
        kvm@...r.kernel.org, the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Xen-devel] KVM PV

On 02/10/2017 12:36, George Dunlap wrote:
>>> Although I'm not business man, I don't think the top cloud provider[s]
>>> would allow nested virtualization, however mature nested virtualization
>>> is. Even xen-pv is unable to be nested in the aws and azure.
>>
>> Check the contributors to KVM nested virtualization, you might be surprised.
>>
>> Nested Xen PV is not possible because the Xen hypervisor cannot run as a PV guest.>> It's a technical limitation.
> 
> Minor correction: Xen can't run on AWS as a PV guest, but it can run
> as an L1 hypervisor inside any "fully virtualized" VM (as both AWS and
> Azure provide), and provide PV L2 guests.

Yes, that's what I meant.

Thanks George!

Paolo