linux-kernel - Re: [PATCH 3/3] KVM: VMX: Extend VMX's #AC interceptor to handle split lock #AC in guest

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Date:   Thu, 2 Apr 2020 22:40:03 +0000
From:   Nadav Amit <namit@...are.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     Sean Christopherson <sean.j.christopherson@...el.com>,
        x86 <x86@...nel.org>, "Kenneth R . Crudup" <kenny@...ix.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Tony Luck <tony.luck@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jessica Yu <jeyu@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>, kvm <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Doug Covelli <dcovelli@...are.com>
Subject: Re: [PATCH 3/3] KVM: VMX: Extend VMX's #AC interceptor to handle
 split lock #AC in guest

> On Apr 2, 2020, at 3:27 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> 
>  As I just verified, it's possible to load the vmware module parallel
>  to the KVM/VMX one.
> 
> So either we deal with it in some way or just decide that SLD and HV
> modules which do not have the MOD_INFO(sld_safe) magic cannot be loaded
> when SLD is enabled on the host. I'm fine with the latter :)
> 
> What a mess.

[ +Doug ]

Just to communicate the information that was given to me: we do intend to
fix the SLD issue in VMware and if needed to release a minor version that
addresses it. Having said that, there are other hypervisors, such as
virtualbox or jailhouse, which would have a similar issue.