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 F2B75C4332F for ; Mon, 30 Oct 2023 17:37:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231648AbjJ3RhG (ORCPT ); Mon, 30 Oct 2023 13:37:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233959AbjJ3RhC (ORCPT ); Mon, 30 Oct 2023 13:37:02 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 500FEA9 for ; Mon, 30 Oct 2023 10:36:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1698687374; 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:autocrypt:autocrypt; bh=3jYLwfXXzRbH81zwo7MCV6nGPuDVHVRPsAgIWckITik=; b=IcA+ZLnpKQJpkCRGDeb33JEkCn0qNxsf+T38lWM+J1FdtxfUv3d9OgweJu6+CVjKyNkrdb xFUFoD42L/cV+VNMIP9EugPeJNCCu6ePeotPp/6SdlzGexxjJrJaQcjpo4kSnAW0weezRq 9i8t5ffjdsjeJr6mTv6hFVPs4mNBzpg= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-533-6AZ6CbD7O3K3ItSxFDIcFw-1; Mon, 30 Oct 2023 13:36:13 -0400 X-MC-Unique: 6AZ6CbD7O3K3ItSxFDIcFw-1 Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-407d3e55927so33339385e9.1 for ; Mon, 30 Oct 2023 10:36:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698687372; x=1699292172; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=3jYLwfXXzRbH81zwo7MCV6nGPuDVHVRPsAgIWckITik=; b=Hhht/nDHj2YlO+8MbgdIq0LaR1kdsI2SSNFlp1/yZXcNtGXdLqzlBcVE5rCsgtico4 fm1IJpjlCriUxAax7hVgmuBBiGIbzSrTln5WFBVp6UPzTiL5fUBOQ/6Yn1yJjMZsXUXG cr3L2k4RGo+y9A0PHg2/BbohstvR1t9yRYGBPgNJauXGGNpEcQUes4rT2Aq7zbbo1co/ Q0PGbPtPgTyEJZUmVTAvUjvbDGU7pynyuHt4WW4pEj4W14or+m+d4/NUQcXVQ8s6HMt2 xq+9g3yWMJ7r/0ScodBl32ONI0alyDO/0TCC9nzF9tQohGjgA6B9hjuKAOqUClU9Iopd fx/A== X-Gm-Message-State: AOJu0YxILSqw83BLi1r06b9+2SsMaRVMXAXt3I9S6obj/myRFNhwtad/ YWKtX70w9VmbMWaNG9ya2x4BIzUY5sq/DroBVp6ghGFzeliucoQZjfXpHImIthdMgcIyaV5ipWc qdXlQmy0FZjzrdsml11YT2A== X-Received: by 2002:adf:ec4f:0:b0:32d:8357:42dd with SMTP id w15-20020adfec4f000000b0032d835742ddmr6883249wrn.68.1698687371990; Mon, 30 Oct 2023 10:36:11 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEboAELdFqaoOZREgnEhsC/lbRki6/0Jdh0l66f6RUru0wLk22AqSmUMVbSPZpU1ZFwEkh2hA== X-Received: by 2002:adf:ec4f:0:b0:32d:8357:42dd with SMTP id w15-20020adfec4f000000b0032d835742ddmr6883233wrn.68.1698687371568; Mon, 30 Oct 2023 10:36:11 -0700 (PDT) Received: from [192.168.1.174] ([151.81.68.207]) by smtp.googlemail.com with ESMTPSA id p14-20020a5d68ce000000b003253523d767sm8703507wrw.109.2023.10.30.10.36.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Oct 2023 10:36:10 -0700 (PDT) Message-ID: Date: Mon, 30 Oct 2023 18:36:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 23/35] KVM: x86: Add support for "protected VMs" that can utilize private memory Content-Language: en-US To: Sean Christopherson , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Viro , Christian Brauner , "Matthew Wilcox (Oracle)" , Andrew Morton Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Xiaoyao Li , Xu Yilun , Chao Peng , Fuad Tabba , Jarkko Sakkinen , Anish Moorthy , David Matlack , Yu Zhang , Isaku Yamahata , =?UTF-8?B?TWlja2HDq2wgU2FsYcO8?= =?UTF-8?Q?n?= , Vlastimil Babka , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" References: <20231027182217.3615211-1-seanjc@google.com> <20231027182217.3615211-24-seanjc@google.com> From: Paolo Bonzini Autocrypt: addr=pbonzini@redhat.com; keydata= xsEhBFRCcBIBDqDGsz4K0zZun3jh+U6Z9wNGLKQ0kSFyjN38gMqU1SfP+TUNQepFHb/Gc0E2 CxXPkIBTvYY+ZPkoTh5xF9oS1jqI8iRLzouzF8yXs3QjQIZ2SfuCxSVwlV65jotcjD2FTN04 hVopm9llFijNZpVIOGUTqzM4U55sdsCcZUluWM6x4HSOdw5F5Utxfp1wOjD/v92Lrax0hjiX DResHSt48q+8FrZzY+AUbkUS+Jm34qjswdrgsC5uxeVcLkBgWLmov2kMaMROT0YmFY6A3m1S P/kXmHDXxhe23gKb3dgwxUTpENDBGcfEzrzilWueOeUWiOcWuFOed/C3SyijBx3Av/lbCsHU Vx6pMycNTdzU1BuAroB+Y3mNEuW56Yd44jlInzG2UOwt9XjjdKkJZ1g0P9dwptwLEgTEd3Fo UdhAQyRXGYO8oROiuh+RZ1lXp6AQ4ZjoyH8WLfTLf5g1EKCTc4C1sy1vQSdzIRu3rBIjAvnC tGZADei1IExLqB3uzXKzZ1BZ+Z8hnt2og9hb7H0y8diYfEk2w3R7wEr+Ehk5NQsT2MPI2QBd wEv1/Aj1DgUHZAHzG1QN9S8wNWQ6K9DqHZTBnI1hUlkp22zCSHK/6FwUCuYp1zcAEQEAAc0j UGFvbG8gQm9uemluaSA8cGJvbnppbmlAcmVkaGF0LmNvbT7CwU0EEwECACMFAlRCcBICGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRB+FRAMzTZpsbceDp9IIN6BIA0Ol7MoB15E 11kRz/ewzryFY54tQlMnd4xxfH8MTQ/mm9I482YoSwPMdcWFAKnUX6Yo30tbLiNB8hzaHeRj jx12K+ptqYbg+cevgOtbLAlL9kNgLLcsGqC2829jBCUTVeMSZDrzS97ole/YEez2qFpPnTV0 VrRWClWVfYh+JfzpXmgyhbkuwUxNFk421s4Ajp3d8nPPFUGgBG5HOxzkAm7xb1cjAuJ+oi/K CHfkuN+fLZl/u3E/fw7vvOESApLU5o0icVXeakfSz0LsygEnekDbxPnE5af/9FEkXJD5EoYG SEahaEtgNrR4qsyxyAGYgZlS70vkSSYJ+iT2rrwEiDlo31MzRo6Ba2FfHBSJ7lcYdPT7bbk9 AO3hlNMhNdUhoQv7M5HsnqZ6unvSHOKmReNaS9egAGdRN0/GPDWr9wroyJ65ZNQsHl9nXBqE AukZNr5oJO5vxrYiAuuTSd6UI/xFkjtkzltG3mw5ao2bBpk/V/YuePrJsnPFHG7NhizrxttB nTuOSCMo45pfHQ+XYd5K1+Cv/NzZFNWscm5htJ0HznY+oOsZvHTyGz3v91pn51dkRYN0otqr bQ4tlFFuVjArBZcapSIe6NV8C4cEiSTOwE0EVEJx7gEIAMeHcVzuv2bp9HlWDp6+RkZe+vtl KwAHplb/WH59j2wyG8V6i33+6MlSSJMOFnYUCCL77bucx9uImI5nX24PIlqT+zasVEEVGSRF m8dgkcJDB7Tps0IkNrUi4yof3B3shR+vMY3i3Ip0e41zKx0CvlAhMOo6otaHmcxr35sWq1Jk tLkbn3wG+fPQCVudJJECvVQ//UAthSSEklA50QtD2sBkmQ14ZryEyTHQ+E42K3j2IUmOLriF dNr9NvE1QGmGyIcbw2NIVEBOK/GWxkS5+dmxM2iD4Jdaf2nSn3jlHjEXoPwpMs0KZsgdU0pP JQzMUMwmB1wM8JxovFlPYrhNT9MAEQEAAcLBMwQYAQIACQUCVEJx7gIbDAAKCRB+FRAMzTZp sadRDqCctLmYICZu4GSnie4lKXl+HqlLanpVMOoFNnWs9oRP47MbE2wv8OaYh5pNR9VVgyhD OG0AU7oidG36OeUlrFDTfnPYYSF/mPCxHttosyt8O5kabxnIPv2URuAxDByz+iVbL+RjKaGM GDph56ZTswlx75nZVtIukqzLAQ5fa8OALSGum0cFi4ptZUOhDNz1onz61klD6z3MODi0sBZN Aj6guB2L/+2ZwElZEeRBERRd/uommlYuToAXfNRdUwrwl9gRMiA0WSyTb190zneRRDfpSK5d usXnM/O+kr3Dm+Ui+UioPf6wgbn3T0o6I5BhVhs4h4hWmIW7iNhPjX1iybXfmb1gAFfjtHfL xRUr64svXpyfJMScIQtBAm0ihWPltXkyITA92ngCmPdHa6M1hMh4RDX+Jf1fiWubzp1voAg0 JBrdmNZSQDz0iKmSrx8xkoXYfA3bgtFN8WJH2xgFL28XnqY4M6dLhJwV3z08tPSRqYFm4NMP dRsn0/7oymhneL8RthIvjDDQ5ktUjMe8LtHr70OZE/TT88qvEdhiIVUogHdo4qBrk41+gGQh b906Dudw5YhTJFU3nC6bbF2nrLlB4C/XSiH76ZvqzV0Z/cAMBo5NF/w= In-Reply-To: <20231027182217.3615211-24-seanjc@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On 10/27/23 20:22, Sean Christopherson wrote: > Add a new x86 VM type, KVM_X86_SW_PROTECTED_VM, to serve as a development > and testing vehicle for Confidential (CoCo) VMs, and potentially to even > become a "real" product in the distant future, e.g. a la pKVM. > > The private memory support in KVM x86 is aimed at AMD's SEV-SNP and > Intel's TDX, but those technologies are extremely complex (understatement), > difficult to debug, don't support running as nested guests, and require > hardware that's isn't universally accessible. I.e. relying SEV-SNP or TDX > for maintaining guest private memory isn't a realistic option. > > At the very least, KVM_X86_SW_PROTECTED_VM will enable a variety of > selftests for guest_memfd and private memory support without requiring > unique hardware. > > Signed-off-by: Sean Christopherson Reviewed-by: Paolo Bonzini with one nit: > +--------------------- > + > +:Capability: KVM_CAP_MEMORY_ATTRIBUTES > +:Architectures: x86 > +:Type: system ioctl > + > +This capability returns a bitmap of support VM types. The 1-setting of bit @n s/support/supported/ Paolo