linux-kernel - Re: [RFC PATCH 08/11] KVM: x86: Let moving encryption context be configurable

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Date:   Thu, 10 Aug 2023 16:03:16 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ackerley Tng <ackerleytng@...gle.com>, seanjc@...gle.com,
        tglx@...utronix.de, x86@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, shuah@...nel.org, andrew.jones@...ux.dev,
        ricarkol@...gle.com, chao.p.peng@...ux.intel.com, tabba@...gle.com,
        jarkko@...nel.org, yu.c.zhang@...ux.intel.com,
        vannapurve@...gle.com, erdemaktas@...gle.com,
        mail@...iej.szmigiero.name, vbabka@...e.cz, david@...hat.com,
        qperret@...gle.com, michael.roth@....com, wei.w.wang@...el.com,
        liam.merwick@...cle.com, isaku.yamahata@...il.com,
        kirill.shutemov@...ux.intel.com
Subject: Re: [RFC PATCH 08/11] KVM: x86: Let moving encryption context be
 configurable

On 8/8/23 01:01, Ackerley Tng wrote:
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 75d48379d94d..a1a28dd77b94 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6351,7 +6351,14 @@ static int kvm_vm_move_enc_context_from(struct kvm *kvm, unsigned int source_fd)
>   	if (r)
>   		goto out_mark_migration_done;
>   
> -	r = static_call(kvm_x86_vm_move_enc_context_from)(kvm, source_kvm);
> +	/*
> +	 * Different types of VMs will allow userspace to define if moving
> +	 * encryption context should be supported.
> +	 */
> +	if (kvm->arch.vm_move_enc_ctxt_supported &&
> +	    kvm_x86_ops.vm_move_enc_context_from) {
> +		r = static_call(kvm_x86_vm_move_enc_context_from)(kvm, source_kvm);
> +	}

Rather than "supported" this is more "required".  So  perhaps 
kvm->arch.use_vm_enc_ctxt_op?

Paolo