linux-kernel - Re: [RFC] KVM: x86: Support KVM VMs sharing SEV context

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Date:   Tue, 16 Mar 2021 18:58:42 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Nathan Tempelman <natet@...gle.com>
Cc:     Thomas Lendacky <thomas.lendacky@....com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Steve Rutherford <srutherford@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ashish Kalra <Ashish.Kalra@....com>
Subject: Re: [RFC] KVM: x86: Support KVM VMs sharing SEV context

On 16/03/21 18:52, Sean Christopherson wrote:
>> I don't
>> know that holding the fd instead of the kvm makes that much better though,
>> are there advantages to that I'm not seeing?
> If there's no kvm pointer, it's much more difficult for someone to do the wrong
> thing, and any such shenanigans stick out like a sore thumb in patches, which
> makes reviewing future changes easier.

On the other hand holding the fd open complicates the code, reference 
counting rules are already hard enough.

I think we only need a replacement for "mirror", what about "dependent"? 
  "is_dependent_enc_context" seems clear enough.

Paolo