linux-kernel - Re: [RFC PATCH v4 7/7] KVM: x86: Allow Qemu/KVM to use PVH entry point

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Message-ID: <db421f9a-f0e5-ee15-3348-20f806f7a852@suse.com>
Date:   Thu, 1 Mar 2018 08:31:17 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Maran Wilson <maran.wilson@...cle.com>, pbonzini@...hat.com,
        boris.ostrovsky@...cle.com, roger.pau@...rix.com,
        andrew.cooper3@...rix.com, hch@...radead.org, JBeulich@...e.com,
        x86@...nel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        rkrcmar@...hat.com, jpoimboe@...hat.com, bp@...e.de,
        kirill.shutemov@...ux.intel.com, thomas.lendacky@....com,
        luto@...nel.org, dave.hansen@...ux.intel.com, davem@...emloft.net,
        gregkh@...uxfoundation.org, mchehab@...nel.org,
        linus.walleij@...aro.org, rdunlap@...radead.org
Subject: Re: [RFC PATCH v4 7/7] KVM: x86: Allow Qemu/KVM to use PVH entry
 point

On 28/02/18 19:28, 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 enables Qemu to use that same entry point for booting KVM
> guests.
> 
> Signed-off-by: Maran Wilson <maran.wilson@...cle.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen