linux-kernel - Re: [Xen-devel] [PATCH RFC 00/39] x86/KVM: Xen HVM guest support

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Message-ID: <20190220233941.GA5279@mail-itl>
Date:   Thu, 21 Feb 2019 00:39:41 +0100
From:   Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>
To:     Joao Martins <joao.m.martins@...cle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        x86@...nel.org, Ankur Arora <ankur.a.arora@...cle.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Xen-devel] [PATCH RFC 00/39] x86/KVM: Xen HVM guest support

On Wed, Feb 20, 2019 at 08:15:30PM +0000, Joao Martins wrote:
>  2. PV Driver support (patches 17 - 39)
> 
>  We start by redirecting hypercalls from the backend to routines
>  which emulate the behaviour that PV backends expect i.e. grant
>  table and interdomain events. Next, we add support for late
>  initialization of xenbus, followed by implementing
>  frontend/backend communication mechanisms (i.e. grant tables and
>  interdomain event channels). Finally, introduce xen-shim.ko,
>  which will setup a limited Xen environment. This uses the added
>  functionality of Xen specific shared memory (grant tables) and
>  notifications (event channels).

Does it mean backends could be run in another guest, similarly as on
real Xen? AFAIK virtio doesn't allow that as virtio backends need
arbitrary write access to guest memory. But grant tables provide enough
abstraction to do that safely.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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