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


  • To: Joao Martins <joao.m.martins@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
  • From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
  • Date: Wed, 20 Feb 2019 22:09:00 +0100
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  • Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Radim Krčmář <rkrcmar@xxxxxxxxxx>, x86@xxxxxxxxxx, Ankur Arora <ankur.a.arora@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
  • Delivery-date: Wed, 20 Feb 2019 21:09:30 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 20/02/19 21:15, 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).

I am a bit worried by the last patches, they seem really brittle and
prone to breakage.  I don't know Xen well enough to understand if the
lack of support for GNTMAP_host_map is fixable, but if not, you have to
define a completely different hypercall.

Of course, tests are missing.  You should use the
tools/testing/selftests/kvm/ framework, and ideally each patch should
come with coverage for the newly-added code.

Thanks,

Paolo

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