linux-kernel - Re: [PATCH v4 00/10] PCID and improved laziness

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Date:   Wed, 13 Sep 2017 09:45:34 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
        x86@...nel.org, linux-kernel <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, mgorman@...e.de, linux-mm@...ck.org,
        nadav.amit@...il.com, riel@...hat.com,
        "Hansen, Dave" <dave.hansen@...el.com>, arjan@...ux.intel.com,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Yu, Fenghua" <fenghua.yu@...el.com>
Subject: Re: [PATCH v4 00/10] PCID and improved laziness


* Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Andy Lutomirski <luto@...capital.net> wrote:
> 
> > I'm on my way to LPC, so I can't  easily work on this right this instant.
> > 
> > Can you try this branch, though?
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?h=x86/fixes&id=cb88ae619b4c3d832d224f2c641849dc02aed864
> 
> Any objections against me applying these fixes directly and getting them to Linus 
> later today, to not widen the window of breakage any further?
> 
> I'll also apply:
> 
>    x86/mm/64: Initialize CR4.PCIDE early

So now that I've looked at the branch, I think I'll apply these three:

  cb88ae619b4c: x86/mm/64: Initialize CR4.PCIDE early
  6ec68017784f: x86/hibernate/64: Mask off CR3's PCID bits in the saved CR3
  5d1298206d7b: x86/mm: Get rid of VM_BUG_ON in switch_tlb_irqs_off()

The first one is that likely fixed the crash that Sai Praneeth Prakhya reported.

Thanks,

	Ingo