From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29CBDC433E0 for ; Fri, 5 Mar 2021 15:14:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3AE96508F for ; Fri, 5 Mar 2021 15:14:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229701AbhCEPNg (ORCPT ); Fri, 5 Mar 2021 10:13:36 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:60108 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229637AbhCEPNg (ORCPT ); Fri, 5 Mar 2021 10:13:36 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1614957215; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=asQEDK/IFlF1AzTuh7B6Z7PmHKHnowQYucM/TtzqZLc=; b=duOYCxHJaWN5UetkXmSatKuTgtT26bQUNXjKJA1sSFaZKCUclpKTQVstSvou6yDllNn1I9 277+dfbUZq2d81DJAH6aT1gbDNPRnpcWzt5ziflXq8RpwW2Vdzo0XLaUge+5+IqoOuW74l e403N48Qvf9LfbqDeYM8UDI4FKmC9N4= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-109-Re5f6JtnMQKLLrTuCL7JsQ-1; Fri, 05 Mar 2021 10:13:34 -0500 X-MC-Unique: Re5f6JtnMQKLLrTuCL7JsQ-1 Received: by mail-wm1-f70.google.com with SMTP id o9so525823wmq.9 for ; Fri, 05 Mar 2021 07:13:33 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=asQEDK/IFlF1AzTuh7B6Z7PmHKHnowQYucM/TtzqZLc=; b=IBvS0vvZWw7c+cndqHUamlqPT9xwjt3ELvQxSHlrXRv9o/KomHEMs7MrAWLIOBsvyo ZoZyt/D2QXo3ILC+PmN6oD4twpLut1K5Y956DMsUWe/ezycaJ4lNjCv8FGcZyBjwWOxg +8ba0W/q9VNEUB5lQ9eJoTMZG8PuesAE2+1T1GusMbgVrAsgw3MDCX2qnGNPyCgGHyTi f+xrF2V2l9SfOiJMqXWzd2KOjkuSeFu6nyMTtWlrPC3Kj1E04q//AniWwZ8czPkwWUCC Tt82RgYzKGQRqr3Fbr93wsvhF6rtObmqx4MHbpfzj4U8XHu+wgACGZGNqcPAZOYugrsA nyHg== X-Gm-Message-State: AOAM5325PeSojX+RRIAAjjJrH7KtRHdmvMbZN5A2X1wCW48teb/7yYmH GY6/qKqMTCmlDYNN20PJBG56a4kvOLnVouXhVfu5Ar9BW/gi0vOkyTjlcPEkFl2zPxzKHJtMIM2 a2dgwT7vRtdIY X-Received: by 2002:a05:6000:250:: with SMTP id m16mr10096780wrz.325.1614957213007; Fri, 05 Mar 2021 07:13:33 -0800 (PST) X-Google-Smtp-Source: ABdhPJxh+5UfU/c1pKkqPKD4eP6McHeuqr7RK32/Td72w0GoL12d9wQEN1qTVtQpkkZESPLSpJa3Ew== X-Received: by 2002:a05:6000:250:: with SMTP id m16mr10096752wrz.325.1614957212735; Fri, 05 Mar 2021 07:13:32 -0800 (PST) Received: from ?IPv6:2001:b07:6468:f312:c8dd:75d4:99ab:290a? ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id n6sm5213171wrt.1.2021.03.05.07.13.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 05 Mar 2021 07:13:31 -0800 (PST) Subject: Re: [RFC] KVM: x86: Support KVM VMs sharing SEV context To: Ashish Kalra , Nathan Tempelman Cc: thomas.lendacky@amd.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, srutherford@google.com, seanjc@google.com, rientjes@google.com, brijesh.singh@amd.com References: <20210224085915.28751-1-natet@google.com> <20210305140409.GA2116@ashkalra_ubuntu_server> From: Paolo Bonzini Message-ID: Date: Fri, 5 Mar 2021 16:13:30 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <20210305140409.GA2116@ashkalra_ubuntu_server> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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