linux-kernel - Re: [patch 0/2] x86: Prevent Split-Lock-Detection wreckage on VMX hypervisors

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Message-ID: <alpine.DEB.2.21.2004020747010.10453@xps-7390>
Date:   Thu, 2 Apr 2020 07:53:04 -0700 (PDT)
From:   "Kenneth R. Crudup" <kenny@...ix.com>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jessica Yu <jeyu@...nel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Nadav Amit <namit@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [patch 0/2] x86: Prevent Split-Lock-Detection wreckage on VMX
 hypervisors

> > (Also, what "thing" exactly did you want?)

On Thu, 2 Apr 2020, Peter Zijlstra wrote:

> All the .ko files that come with vmware.

Ah, gotcha. One thing you/VMWare may want to look at is it turns out that
"vmw_vmci", part of the kernel tree (CONFIG_VMWARE_VMCI) has to be compiled
into the kernel as a module so udev can properly create the Misc device node
(I'd tried making it a built-in and messing with udev rules and the other,
compiled-in-later VMWare module loading system didn't seem to like that).

Maybe some sort of mitigation for this can be done there, putting it back in-tree?

But anyway, I'll send you a .tar.bz2 in a little bit.

	-Kenny

-- 
Kenneth R. Crudup  Sr. SW Engineer, Scott County Consulting, Silicon Valley