linux-kernel - Re: [PATCH] KVM: x86: VMX: Make smaller physical guest address space support user-configurable

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Date:   Wed, 23 Sep 2020 17:19:46 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     Mohammed Gamal <mgamal@...hat.com>, joro@...tes.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com
Subject: Re: [PATCH] KVM: x86: VMX: Make smaller physical guest address space
 support user-configurable

On 23/09/20 16:32, Jim Mattson wrote:
> You don’t buy my argument that this should be per-VM, then? I’d bet that
> we have very close to 0 customers who care about emulating the reserved
> bits properly for 46-but wide VMs, but there may be someone out there
> using shadow paging in a nested kvm. 
> 

I do buy it but I prefer not to have a released version of Linux where
this is enabled by default.  I procrastinated hoping to cobble something
together but I didn't have time.

Paolo