linux-kernel - Re: [PATCH v9 0/7] KVM: x86: Allow Qemu/KVM to use PVH entry point

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20181211131825.GD27375@zn.tnic>
Date:   Tue, 11 Dec 2018 14:18:25 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Maran Wilson <maran.wilson@...cle.com>
Cc:     x86@...nel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com, jgross@...e.com, boris.ostrovsky@...cle.com,
        bp@...e.de, dave.hansen@...ux.intel.com, davem@...emloft.net,
        gregkh@...uxfoundation.org, hpa@...or.com, jpoimboe@...hat.com,
        kirill.shutemov@...ux.intel.com, luto@...nel.org,
        mchehab@...nel.org, mingo@...hat.com, rdunlap@...radead.org,
        tglx@...utronix.de, thomas.lendacky@....com, hch@...radead.org,
        roger.pau@...rix.com, rkrcmar@...hat.com
Subject: Re: [PATCH v9 0/7] KVM: x86: Allow Qemu/KVM to use PVH entry point

On Mon, Dec 10, 2018 at 11:05:34AM -0800, 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.

How would I do that, practically?

Looking at those here:

>  * Qemu and qboot RFC patches have been posted to show one example of how
>    this functionality can be used. Some preliminary numbers are available
>    in those cover letters showing the KVM guest boot time improvement.
>       Qemu:
>       http://lists.nongnu.org/archive/html/qemu-devel/2018-12/msg00957.html
>       qboot:
>       http://lists.nongnu.org/archive/html/qemu-devel/2018-12/msg00953.html

I might still need to do some dancing to get stuff going.

Thx.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.