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

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Message-ID: <ba4121bd-cad7-49f3-d53c-d1b03d95ca39@redhat.com>
Date:   Fri, 5 Mar 2021 16:13:30 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ashish Kalra <ashish.kalra@....com>,
        Nathan Tempelman <natet@...gle.com>
Cc:     thomas.lendacky@....com, x86@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, srutherford@...gle.com,
        seanjc@...gle.com, rientjes@...gle.com, brijesh.singh@....com
Subject: Re: [RFC] KVM: x86: Support KVM VMs sharing SEV context

On 05/03/21 15:04, Ashish Kalra wrote:
>> +	/* Mirrors of mirrors should work, but let's not get silly */
>> +	if (is_mirroring_enc_context(kvm)) {
>> +		ret = -ENOTTY;
>> +		goto failed;
>> +	}
> How will A->B->C->... type of live migration work if mirrors of
> mirrors are not supported ?

Each host would only run one main VM and one mirror, wouldn't it?

Paolo