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

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Message-ID: <875zeinecr.fsf@nanos.tec.linutronix.de>
Date:   Thu, 02 Apr 2020 16:37:08 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Kenneth R. Crudup" <kenny@...ix.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        "Peter Zijlstra \(Intel\)" <peterz@...radead.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

"Kenneth R. Crudup" <kenny@...ix.com> writes:

> On Thu, 2 Apr 2020, Thomas Gleixner wrote:
>
>> As Peter and myself don't have access to a SLD enabled machine, the
>> KVM/VMX part is untested. The module scan part works.
>
> I just applied both of these patches to my (Linus' tip) tree, and unfortunately
> VMWare still hangs if split_lock_detect= is set to anything but "off".
>
> Was there anything else I'd needed to do?

Hmm. Not really. Does dmesg show the warning when the VMWare module loads?
Something like:

  x86/split lock detection: disabled due to VMLAUNCH in module: ....

Thanks,

        tglx