linux-kernel - Re: [RFC PATCH 0/7] x86/intel_rdt: Restoration of Cache Pseudo-Locked regions

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Message-ID: <20180803155131.GZ2476@hirez.programming.kicks-ass.net>
Date:   Fri, 3 Aug 2018 17:51:31 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Reinette Chatre <reinette.chatre@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, fenghua.yu@...el.com,
        Tony Luck <tony.luck@...el.com>,
        vikas.shivappa@...ux.intel.com, gavin.hindman@...el.com,
        jithu.joseph@...el.com, dave.hansen@...el.com, mingo@...hat.com,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/7] x86/intel_rdt: Restoration of Cache
 Pseudo-Locked regions

On Fri, Aug 03, 2018 at 08:40:25AM -0700, Reinette Chatre wrote:

> > Can we just get rid of WBINVD?
> 
> While directed at me I am not able to answer this. native_wbinvd() is
> used in a few areas that appear important to me.

Some, like the crusty AGP gart or boot time mem_encrypt usage is fine,
the former nobody cares about, the latter is not interresting because
boot-time.

But others like the drm_cache usage is utter nonense and should really
be replaced like we already do in cpa_flush_array() for PREEMPT, and
this should really be made unconditional.