Re: [PATCH v5 3/9] x86/split_lock: Re-define the kernel param option for split_lock_detect

[Thomas Gleixner]

Sean Christopherson <sean.j.christopherson@xxxxxxxxx> writes:
> On Tue, Mar 24, 2020 at 11:40:18AM +0100, Thomas Gleixner wrote:
>> 
>> It's very much about whether the host is split lock clean.
>> 
>> If your host kernel is not, then this wants to be fixed first. If your
>> host application is broken, then either fix it or use "warn".
>
> The "kvm only" option was my suggestion.  The thought was to provide a way
> for users to leverage KVM to debug/test kernels without having to have a
> known good kernel and/or to minimize the risk of crashing their physical
> system.  E.g. debug a misbehaving driver by assigning its associated device
> to a guest.

warn is giving you that, right? I won't crash the host because the #AC
triggers in guest context.

Thanks,

        tglx