linux-kernel - Re: [PATCH v2 1/5] x86/kvm: rename HV_X64_MSR_APIC_ASSIST_PAGE to HV_X64_MSR_VP_ASSIST

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Message-ID: <20180307180442.GA16795@flask>
Date:   Wed, 7 Mar 2018 19:04:43 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Roman Kagan <rkagan@...tuozzo.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        Mohammed Gamal <mmorsy@...hat.com>,
        Cathy Avery <cavery@...hat.com>, Bandan Das <bsd@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] x86/kvm: rename HV_X64_MSR_APIC_ASSIST_PAGE to
 HV_X64_MSR_VP_ASSIST_PAGE

2018-03-07 19:48+0300, Roman Kagan:
> On Wed, Mar 07, 2018 at 05:19:44PM +0100, Radim Krčmář wrote:
> > 2018-02-26 18:11+0100, Vitaly Kuznetsov:
> > > diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h
> > > @@ -275,10 +275,10 @@ struct hv_tsc_emulation_status {
> > >  #define HVCALL_POST_MESSAGE			0x005c
> > >  #define HVCALL_SIGNAL_EVENT			0x005d
> > >  
> > > -#define HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE		0x00000001
> > > -#define HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT	12
> > > -#define HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_MASK	\
> > > -		(~((1ull << HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT) - 1))
> > 
> > Removing definitions from userspace api isn't a good idea.
> > 
> > I have no idea why hyper.h is a userspace api, though -- Linux doesn't
> > define any of those, so we could copy the definitions to a private
> > header, rename, and never look at this file again.
> 
> That was a thinko when it was moved to uapi, and it has already been
> identified as a problem, so now QEMU has its own header with the
> definitions it needs, and I'm unaware of any other userspace project
> that depends on this stuff.  So I've been planning to remove it from
> uapi but still haven't got around to posting the patch :(

Great, let's be bold here.