linux-kernel - RE: [PATCH v5 08/10] x86/hyper-v: use hypercall for remote TLB flush

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Date:   Tue, 30 May 2017 19:17:46 +0000
From:   Jork Loeser <Jork.Loeser@...rosoft.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
CC:     "x86@...nel.org" <x86@...nel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        KY 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>,
        "Simon Xiao" <sixiao@...rosoft.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: RE: [PATCH v5 08/10] x86/hyper-v: use hypercall for remote TLB flush

> -----Original Message-----
> From: Andy Shevchenko [mailto:andy.shevchenko@...il.com]
> Sent: Tuesday, May 30, 2017 09:53
> To: Vitaly Kuznetsov <vkuznets@...hat.com>
> Cc: x86@...nel.org; devel@...uxdriverproject.org; linux-
> kernel@...r.kernel.org; KY 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 08/10] x86/hyper-v: use hypercall for remote TLB flush
> 
> On Tue, May 30, 2017 at 2:34 PM, Vitaly Kuznetsov <vkuznets@...hat.com>
> wrote:
> > +#define HV_FLUSH_ALL_PROCESSORS                        0x00000001
> > +#define HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES    0x00000002
> > +#define HV_FLUSH_NON_GLOBAL_MAPPINGS_ONLY      0x00000004
> > +#define HV_FLUSH_USE_EXTENDED_RANGE_FORMAT     0x00000008
> 
> BIT() ?

Certainly a matter of taste. Given that the Hyper-V spec lists these as hex numbers, I find the explicit numbers appropriate.

Regards,
Jork