linux-kernel - Re: linux-next: manual merge of the kvm tree with Linus' and the tip trees

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Date:   Mon, 15 Jan 2018 19:36:54 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        KVM <kvm@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: linux-next: manual merge of the kvm tree with Linus' and the
 tip trees

On Mon, 15 Jan 2018, Thomas Gleixner wrote:
> On Mon, 15 Jan 2018, Stephen Rothwell wrote:
> > Hi all,
> > --- a/arch/x86/include/asm/cpufeatures.h
> > +++ b/arch/x86/include/asm/cpufeatures.h
> > @@@ -202,11 -201,9 +202,11 @@@
> >   #define X86_FEATURE_HW_PSTATE		( 7*32+ 8) /* AMD HW-PState */
> >   #define X86_FEATURE_PROC_FEEDBACK	( 7*32+ 9) /* AMD ProcFeedbackInterface */
> >   #define X86_FEATURE_SME			( 7*32+10) /* AMD Secure Memory Encryption */
> >  -#define X86_FEATURE_SEV			( 7*32+11) /* AMD Secure Encrypted Virtualization */
> >  -
> >  +#define X86_FEATURE_PTI			( 7*32+11) /* Kernel Page Table Isolation enabled */
> >  +#define X86_FEATURE_RETPOLINE		( 7*32+12) /* Generic Retpoline mitigation for Spectre variant 2 */
> >  +#define X86_FEATURE_RETPOLINE_AMD	( 7*32+13) /* AMD Retpoline mitigation for Spectre variant 2 */
> >   #define X86_FEATURE_INTEL_PPIN		( 7*32+14) /* Intel Processor Inventory Number */
> > - #define X86_FEATURE_INTEL_PT		( 7*32+15) /* Intel Processor Trace */
> 
> Where is that patch which moves INTEL_PT ?
> 
> commit 632218d8dee296c8b397c13b7b3b4be090a1c043
> Author: Paolo Bonzini <pbonzini@...hat.com>
> Date:   Mon Dec 11 04:30:50 2017 +0800
> 
>     x86: cpufeature: move processor tracing out of scattered features
>     
>     Processor tracing is already enumerated in word 9 (CPUID[7,0].EBX),
>     so do not duplicate it in the scattered features word.
>     
>     Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> 
> Can KVM folks please stop doing random changes to the cpufeatures code
> without talking to x86 maintainers and Borislav?
> 
> This wants to go through TIP or at least reviewed and acked.

In fact it needs to go through TIP. We spent a lot of effort to make the
backporting of all this mess simple and this is just shooting a hole in it.

Please drop that change and we sort something out how it can be done proper.

Dammit, we have a well established process for stuff like that.

Thanks,

	tglx