linux-kernel - Re: [PATCH v5 04/10] x86/hyper-v: fast hypercall implementation

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Message-ID: <CAHp75VegeMnMMZf0QEkSmVSJC4sC3By+sJ=W_FYFmx1R5Y0e2g@mail.gmail.com>
Date:   Tue, 30 May 2017 19:31:11 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     "x86@...nel.org" <x86@...nel.org>, devel@...uxdriverproject.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jork Loeser <Jork.Loeser@...rosoft.com>,
        Simon Xiao <sixiao@...rosoft.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v5 04/10] x86/hyper-v: fast hypercall implementation

On Tue, May 30, 2017 at 2:34 PM, Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
> Hyper-V supports 'fast' hypercalls when all parameters are passed through
> registers. Implement an inline version of a simpliest of these calls:
> hypercall with one 8-byte input and no output.

> +       u64 hv_status, control = (u64)code | BIT(16); /* 'fast' flag */

It might make sense to define magic with appropriate name.

-- 
With Best Regards,
Andy Shevchenko