linux-kernel - RE: [PATCH 00/15] hyperv: more stuff to uapi + cleanup

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Message-ID: <DM5PR03MB24900C255854B0BB9288DC6AA0930@DM5PR03MB2490.namprd03.prod.outlook.com>
Date:   Wed, 21 Dec 2016 18:00:17 +0000
From:   KY Srinivasan <kys@...rosoft.com>
To:     Roman Kagan <rkagan@...tuozzo.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "Haiyang Zhang" <haiyangz@...rosoft.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "Denis V . Lunev" <den@...nvz.org>
Subject: RE: [PATCH 00/15] hyperv: more stuff to uapi + cleanup



> -----Original Message-----
> From: Roman Kagan [mailto:rkagan@...tuozzo.com]
> Sent: Tuesday, December 20, 2016 7:56 AM
> To: Paolo Bonzini <pbonzini@...hat.com>; Radim Krčmář
> <rkrcmar@...hat.com>; KY Srinivasan <kys@...rosoft.com>; Vitaly
> Kuznetsov <vkuznets@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>; Ingo Molnar
> <mingo@...hat.com>; H. Peter Anvin <hpa@...or.com>; x86@...nel.org;
> Haiyang Zhang <haiyangz@...rosoft.com>; kvm@...r.kernel.org; linux-
> kernel@...r.kernel.org; devel@...uxdriverproject.org; Denis V . Lunev
> <den@...nvz.org>; Roman Kagan <rkagan@...tuozzo.com>
> Subject: [PATCH 00/15] hyperv: more stuff to uapi + cleanup
> 
> Expose more Hyper-V-related definitions in the uapi header for
> consumption by userspace.
> 
> While doing so, get rid of a number of duplications between the KVM and
> the guest driver code.  Also a few other cleanups are made which are not
> strictly necessary for the main purpose of the series but appear
> reasonable to do at the same time.
> 
> The most controversial is the last patch which modifies the stuff
> already published in the uapi header, in the hope that no userspace
> applications have started relying on it; I'm ok dropping it if this is
> unacceptable.

Roman,

First, let me thank you. Broadly, this patch-set can be broken into
1. Moving existing definitions around - (to make it possible to share these
between Hyper-V guest drivers and KVM)
2. Cleanup of the existing code in the VMBUS driver (under drivers/hv).

To the extent possible, I want to take all non-KVM code through Greg's tree.
We can then modify the KVM code to use these common definitions. Currently, I too
am working on restructuring VMBUS driver code to fully isolate all x86 dependencies.
I can work with you on integration as I too am moving things around.

Regards,

K. Y 

> 
> Roman Kagan (15):
>   hyperv: consolidate TSC ref page definitions
>   hyperv: uapi-fy synic event flags definitions
>   hyperv: use standard bitops
>   hyperv: define VMBus message type
>   hyperv: GFP_ATOMIC -> GFP_KERNEL
>   hyperv: avoid unnecessary vmalloc
>   hyperv: dedup cpuid definitions
>   hyperv: dedup crash msr related definitions
>   hyperv: unify Hyper-V msr definitions
>   hyperv: uapi-fy PostMessage and SignalEvent hypercall structures
>   hyperv: uapi-fy monitored notification structures
>   hyperv: move VMBus connection ids to uapi
>   hyperv: move function close to its only callsite
>   hyperv_vmbus: drop unused definitions
>   hyperv: redefine hv_message without bitfields
> 
>  arch/x86/include/asm/kvm_host.h    |   2 +-
>  arch/x86/include/uapi/asm/hyperv.h | 101 +++++++---
>  drivers/hv/hyperv_vmbus.h          | 399 +------------------------------------
>  include/linux/hyperv.h             |  24 +--
>  arch/x86/kvm/hyperv.c              |  14 +-
>  drivers/hv/channel.c               |   8 +-
>  drivers/hv/channel_mgmt.c          |  30 +--
>  drivers/hv/connection.c            |  65 ++----
>  drivers/hv/hv.c                    | 300 +++++++++++++---------------
>  drivers/hv/vmbus_drv.c             |  67 +++----
>  10 files changed, 288 insertions(+), 722 deletions(-)
> 
> --
> 2.9.3