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

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Message-ID: <CANRm+Cx2ZUxtF++B8bf+U9X0Lz_iSwdQpOSG8MBydJKcR2Cx_w@mail.gmail.com>
Date:   Fri, 6 Oct 2017 15:47:39 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     Nadav Amit <nadav.amit@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        George Dunlap <george.dunlap@...rix.com>,
        Lai Jiangshan <jiangshanlai+lkml@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Rusty Russell <rusty@...tcorp.com.au>, lguest@...ts.ozlabs.org,
        kvm <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

2017-10-03 3:11 GMT+08:00 Nadav Amit <nadav.amit@...il.com>:
> Paolo Bonzini <pbonzini@...hat.com> wrote:
>
>> 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!
>
> BTW: If anyone missed, Google already announced that they started supporting
> nested virtualization.
>
> https://cloudplatform.googleblog.com/2017/09/introducing-nested-virtualization-for.html

Awesome!

Regards,
Wanpeng Li