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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25148C433F5 for ; Wed, 6 Apr 2022 00:21:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1583528AbiDEXxH (ORCPT ); Tue, 5 Apr 2022 19:53:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1392301AbiDENtq (ORCPT ); Tue, 5 Apr 2022 09:49:46 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 21E4811177E for ; Tue, 5 Apr 2022 05:52:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649163155; 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=iuSjdFs27sBmSFtBNQcfSgEVjf1hmX+hk7DMTekqxb8=; b=VlzU6C+sB/1eKhzYAZPNvLMGjwj29JMdvQQHeE56JAN1pidwUAfGSaRAGfjrJjc1N9WH5j E7mDuktAkpddDoqOZV/ddLA69sSwqYumIvCQpqCuBaaJPoLW6XO+sfwgubzCMEzbgdfGvu jvV9I7+5UID5dfHNYcwiHDNUl9oJf6E= Received: from mail-qt1-f198.google.com (mail-qt1-f198.google.com [209.85.160.198]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-568-bql5SGCHNWGPqIoQMvOeyg-1; Tue, 05 Apr 2022 08:52:34 -0400 X-MC-Unique: bql5SGCHNWGPqIoQMvOeyg-1 Received: by mail-qt1-f198.google.com with SMTP id y23-20020ac85257000000b002e06697f2ebso8745350qtn.16 for ; Tue, 05 Apr 2022 05:52:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=iuSjdFs27sBmSFtBNQcfSgEVjf1hmX+hk7DMTekqxb8=; b=6zbILJob9N2U4HP/cqV2lPTiyVnbOcWVluy7Hjx12bSQO4qFat0JubxI5egQBK2coB HiUQZTLfyk2Be3DGjF1ur5t6lnLRwjYqGbwQWXX3+STgqgxB5x2doRosALJdvnLWODzO ApvlLLrW/ybXYdaINcMiAjarxFf+mJVz/uuMZWCsE7KjepuJ3NO1c3R8iOfrClD9bQwX ZEueOsaR77S4y9SW2/AODp2aBLlNHcxeklUNUY8yU9BgnNlKlgSTiWmTb8LbtNBrP/Yz xDoOFKNmJ+a4mT4IZrH/0NizHKD0UM0HDoaDYwBpnDnKrOWyizlQG14caqzCTwWXP72Y ELeQ== X-Gm-Message-State: AOAM5306v8KpXirMyM/wGcT2I2+yy3XHK1U+TqkvIZiHn6zOkIwDn871 FJE7kvWfq9rj38FaJfaqTBV8aupXbN91Jw4ts3qx7+NAKEdqnaeloSRE493BSt1Yadv08tjKURt 7EUZaFobyLgPKQbS8vKHP9kLJ X-Received: by 2002:ad4:5aa3:0:b0:443:9ba7:3f27 with SMTP id u3-20020ad45aa3000000b004439ba73f27mr2768353qvg.63.1649163153774; Tue, 05 Apr 2022 05:52:33 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw+DHckKgCo4PomCz5tT74b9OII0g4hXHShOTcpaeQjClTAlXuwMZZykBkAFfOfWWQXnZb1aQ== X-Received: by 2002:ad4:5aa3:0:b0:443:9ba7:3f27 with SMTP id u3-20020ad45aa3000000b004439ba73f27mr2768343qvg.63.1649163153551; Tue, 05 Apr 2022 05:52:33 -0700 (PDT) Received: from [10.32.181.87] (nat-pool-mxp-t.redhat.com. [149.6.153.186]) by smtp.googlemail.com with ESMTPSA id 21-20020ac85715000000b002e1ce9605ffsm11295736qtw.65.2022.04.05.05.52.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Apr 2022 05:52:33 -0700 (PDT) Message-ID: <586be87a-4f81-ea43-2078-a6004b4aba08@redhat.com> Date: Tue, 5 Apr 2022 14:52:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [RFC PATCH v5 026/104] KVM: TDX: x86: Add vm ioctl to get TDX systemwide parameters Content-Language: en-US To: isaku.yamahata@intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: isaku.yamahata@gmail.com, Jim Mattson , erdemaktas@google.com, Connor Kuehl , Sean Christopherson References: <5ff08ce32be458581afe59caa05d813d0e4a1ef0.1646422845.git.isaku.yamahata@intel.com> From: Paolo Bonzini In-Reply-To: <5ff08ce32be458581afe59caa05d813d0e4a1ef0.1646422845.git.isaku.yamahata@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/4/22 20:48, isaku.yamahata@intel.com wrote: > Implement a VM-scoped subcomment to get system-wide parameters. Although > this is system-wide parameters not per-VM, this subcomand is VM-scoped > because > - Device model needs TDX system-wide parameters after creating KVM VM. > - This subcommands requires to initialize TDX module. For lazy > initialization of the TDX module, vm-scope ioctl is better. Since there was agreement to install the TDX module on load, please place this ioctl on the /dev/kvm file descriptor. At least for SEV, there were cases where the system-wide parameters are needed outside KVM, so it's better to avoid requiring a VM file descriptor. Thanks, Paolo