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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id B03EFC4332F for ; Mon, 30 Oct 2023 17:34:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4BD916B026A; Mon, 30 Oct 2023 13:34:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 46DAD6B026B; Mon, 30 Oct 2023 13:34:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 340A16B026C; Mon, 30 Oct 2023 13:34:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 240AD6B026A for ; Mon, 30 Oct 2023 13:34:32 -0400 (EDT) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 026001206C3 for ; Mon, 30 Oct 2023 17:34:31 +0000 (UTC) X-FDA: 81402827184.04.3298404 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf26.hostedemail.com (Postfix) with ESMTP id B278614001F for ; Mon, 30 Oct 2023 17:34:29 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=RVt+8XMS; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf26.hostedemail.com: domain of pbonzini@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=pbonzini@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1698687269; h=from:from:sender: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:dkim-signature; bh=5fMqrw+qFhssxj8qhYVvLd8lvq+1o5oZc/SrI7TORTQ=; b=CyiGOd0lfSPBFw+fZqW7Rr6yruL5p+kAvvXTenhwhn9GXMhp60cIYkegEYzlNW59JTJLNb TXJDZfyFlUGw6zkgmA8q6DLOzv6sBG7RPPXHm8oWPH/UFlCPpwHzcpJLQ3EazouAN6BSVt tN2h9szQKLlLOGt1ws19WGfUo6iDjB0= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=RVt+8XMS; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf26.hostedemail.com: domain of pbonzini@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=pbonzini@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1698687269; a=rsa-sha256; cv=none; b=buW0o3Mn8YRc8/jzH9OJdgJoeNN2mLfqEVdTTi05t0QdFsdXd6+sycA1Acl8MgFM2KUby3 bUyXLfu6UXSjrRpezOnnZZW/10jG8MZakQPPJiUaVoXE4fPkoJXlCSqTmsy8xbeHrISZU3 JtLJpw+JcE0Wp4+mvFzxSVhzLnPezbY= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1698687269; 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=5fMqrw+qFhssxj8qhYVvLd8lvq+1o5oZc/SrI7TORTQ=; b=RVt+8XMSOYQy/gH6SQsnIzBG75V3/xY/ExM3XUSj+JyEdUgQWvT5asn8PobKhXPoCUTEyD IseAF7UkDEJdQKDUqIxFdOJKXOno9STy/QrUgAAeI3Pia6wIOmh//Hvh+eRGwOeqCWLyu3 5aCHVXxRF47UVe6FvOuA75Wzy+KdiIY= 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-390-Y_FJUQp8Ou2_iN4bDjWm7Q-1; Mon, 30 Oct 2023 13:34:17 -0400 X-MC-Unique: Y_FJUQp8Ou2_iN4bDjWm7Q-1 Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-4083865e0b7so33793515e9.3 for ; Mon, 30 Oct 2023 10:34:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698687256; x=1699292056; 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=5fMqrw+qFhssxj8qhYVvLd8lvq+1o5oZc/SrI7TORTQ=; b=IEc17NejDRT/kK2tE5OLxOsNce7kYiuIajUoyD9vUFKUhCqzuiWNqo8xtPL4DY9GSz f+/TUx2AdxV2Z6I9F3GIW93Ndjq3nqr2E5I9U5EH66Hr3f0zd2jjOMXSJSIelLM5FX5V oeBRXRATC97ujMDXorjfmvXzkWkM2hueZpCQZAgky9jk/PsnONDoqpY2A3lkBOp8+ZDM JblrWKqvU3poGWlBWurOqJqs0lubkHSQ4tn8OR2Dgw/ujum6myDQA3sMWYYY+ZzGoi/x dY5jmjQ2iyJFk60lkQ2E0Ugt4VZwTLHLVki++Za/Xvwl6Zg4zHcsD9VbKVMEw9EvNaxc WvTQ== X-Gm-Message-State: AOJu0Yz6qlibx4NKLEuu7sU6cf48ie7QNzfs75X/n5d16eBrnhkuFTkA D0bo5M+hAWfBcLifKbyff7/6Z3FBLB5zRxRk5n6zZB0nMqm7n79OvEBG3hkOLx84OCojfOBlCLY p+oLVMtXxcgM= X-Received: by 2002:a5d:674c:0:b0:32d:bc7d:c431 with SMTP id l12-20020a5d674c000000b0032dbc7dc431mr8595470wrw.1.1698687256655; Mon, 30 Oct 2023 10:34:16 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGoSwHjCgF60i9p5iHFG+4s/5oKx7xoJBSRpuzoczO/1s/n65Z43CGXqwQnwC+DGZUjQ2L04A== X-Received: by 2002:a5d:674c:0:b0:32d:bc7d:c431 with SMTP id l12-20020a5d674c000000b0032dbc7dc431mr8595455wrw.1.1698687256340; Mon, 30 Oct 2023 10:34:16 -0700 (PDT) Received: from [192.168.1.174] ([151.81.68.207]) by smtp.googlemail.com with ESMTPSA id o26-20020a5d58da000000b0032d2489a399sm8695806wrf.49.2023.10.30.10.34.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Oct 2023 10:34:15 -0700 (PDT) Message-ID: <9bc69994-c98f-48e4-b956-08a8d98a6e6d@redhat.com> Date: Mon, 30 Oct 2023 18:34:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 22/35] KVM: Allow arch code to track number of memslot address spaces per VM 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> <20231027182217.3615211-23-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: <20231027182217.3615211-23-seanjc@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: B278614001F X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: r8g6mj85b5kycrod8pee6exbnnfk6qbt X-HE-Tag: 1698687269-601705 X-HE-Meta: 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 H5Xpeqp7 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/27/23 20:22, Sean Christopherson wrote: > Let x86 track the number of address spaces on a per-VM basis so that KVM > can disallow SMM memslots for confidential VMs. Confidentials VMs are > fundamentally incompatible with emulating SMM, which as the name suggests > requires being able to read and write guest memory and register state. > > Disallowing SMM will simplify support for guest private memory, as KVM > will not need to worry about tracking memory attributes for multiple > address spaces (SMM is the only "non-default" address space across all > architectures). Reviewed-by: Paolo Bonzini