linux-kernel - RE: [PATCH v8 06/13] arch/resctrl: Initialize the resource functions that are different

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Message-ID: <DM5PR12MB24713B1A0FB97FAF2CCCB9A895DA0@DM5PR12MB2471.namprd12.prod.outlook.com>
Date:   Wed, 21 Nov 2018 16:47:30 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     Borislav Petkov <bp@...en8.de>
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Subject: RE: [PATCH v8 06/13] arch/resctrl: Initialize the resource functions
 that are different



> -----Original Message-----
> From: Borislav Petkov <bp@...en8.de>
> Sent: Tuesday, November 20, 2018 6:05 AM
> To: Moger, Babu <Babu.Moger@....com>
> Cc: tglx@...utronix.de; mingo@...hat.com; corbet@....net;
> fenghua.yu@...el.com; reinette.chatre@...el.com; peterz@...radead.org;
> gregkh@...uxfoundation.org; davem@...emloft.net; akpm@...ux-
> foundation.org; hpa@...or.com; x86@...nel.org;
> mchehab+samsung@...nel.org; arnd@...db.de;
> kstewart@...uxfoundation.org; pombredanne@...b.com;
> rafael@...nel.org; kirill.shutemov@...ux.intel.com; tony.luck@...el.com;
> qianyue.zj@...baba-inc.com; xiaochen.shen@...el.com;
> pbonzini@...hat.com; Singh, Brijesh <brijesh.singh@....com>; Hurwitz,
> Sherry <sherry.hurwitz@....com>; dwmw2@...radead.org; Lendacky,
> Thomas <Thomas.Lendacky@....com>; luto@...nel.org; joro@...tes.org;
> jannh@...gle.com; vkuznets@...hat.com; rian@...m.mit.edu;
> jpoimboe@...hat.com; linux-kernel@...r.kernel.org; linux-
> doc@...r.kernel.org
> Subject: Re: [PATCH v8 06/13] arch/resctrl: Initialize the resource functions
> that are different
> 
> On Tue, Nov 20, 2018 at 10:59:18AM +0100, Borislav Petkov wrote:
> > So I'm wondering: instead of having mba_wrmsr_intel() and
> > mba_wrmsr_amd() and adding those per-vendor initialization functions,
> > why don't you push down the vendor differentiation into mba_wrmsr()?
> >
> > Then in that function you do
> >
> > 	if (vendor == X86_VENDOR_INTEL)
> > 		__mba_wrmsr_intel();
> > 	else if (vendor == X86_VENDOR_AMD)
> > 		__mba_wrmsr_amd();
> >
> > and so on and then you don't have to do any of that initialization dance
> > here and the struct rdt_resource assignment for the MBA will remain
> > nicely similar to the other ones...
> >
> > Hmmm?
> 
> Yeah, after having look at the patchset further, that might not be a
> good idea as you need to assign more per-vendor stuff than just an MSR
> accessor function...

Ok. No changes here. Thanks

> 
> --
> Regards/Gruss,
>     Boris.
> 
> Good mailing practices for 400: avoid top-posting and trim the reply.