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Re: [Xen-devel] [PATCH v7 0/7] KVM: x86: Allow Qemu/KVM to use PVH entry point
- To: Maran Wilson <maran.wilson@xxxxxxxxxx>, x86@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, jgross@xxxxxxxx
- From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
- Date: Mon, 19 Nov 2018 19:25:43 +0100
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- Cc: luto@xxxxxxxxxx, rkrcmar@xxxxxxxxxx, linus.walleij@xxxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, hch@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxx, Stefano Garzarella <sgarzare@xxxxxxxxxx>, thomas.lendacky@xxxxxxx, Stefan Hajnoczi <stefanha@xxxxxxxxxx>, jpoimboe@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, mchehab@xxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, rdunlap@xxxxxxxxxxxxx, George Kennedy <george.kennedy@xxxxxxxxxx>, Liam Merwick <liam.merwick@xxxxxxxxxx>, davem@xxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, roger.pau@xxxxxxxxxx
- Delivery-date: Mon, 19 Nov 2018 18:25:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 16/11/18 18:17, Maran Wilson wrote:
> On 11/16/2018 2:46 AM, Paolo Bonzini wrote:
>> On 17/04/18 01:09, Maran Wilson wrote:
>>> For certain applications it is desirable to rapidly boot a KVM virtual
>>> machine. In cases where legacy hardware and software support within the
>>> guest is not needed, Qemu should be able to boot directly into the
>>> uncompressed Linux kernel binary without the need to run firmware.
>>>
>>> There already exists an ABI to allow this for Xen PVH guests and the ABI
>>> is supported by Linux and FreeBSD:
>>>
>>> https://xenbits.xen.org/docs/unstable/misc/pvh.html
>>>
>>> This patch series would enable Qemu to use that same entry point for
>>> booting KVM guests.
>> Hi Maran, what happened to this series (and to the QEMU work)?
>
> Hi Paolo,
>
> Thank you for the reminder. Sorry, I have been wanting to continue this
> work for a while now, but our team has been pulled in other directions
> and this one ended up getting temporarily pushed down the priority stack.
>
> Let me discuss with my management and get back to you. I do want (and
> intend) to support and push this over the finish line.
>
> In the meantime, if there are any folks out there with a specific
> business need for getting this done sooner rather than later
Well, we are interested in using this to avoid the decompression cost of
booting a "container-like" VM image. I'm not sure what we will do about
that, but certainly getting this included in the upstream projects would
be a prerequisite.
If you really prefer to discuss things offlist, feel free to include me,
Stefan and Stefano.
Paolo
> and are
> able to invest a bit of time to collaborate on the remaining Qemu work,
> please feel free to ping me offline. We have some preliminary Qemu
> patches, but there is some additional work needed before they are ready
> wider review.
>
> Thanks,
> -Maran
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