From patchwork Tue Mar 18 16:18:14 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fuad Tabba X-Patchwork-Id: 14021234 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 5F505C282EC for ; Tue, 18 Mar 2025 16:18:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 36C01280002; Tue, 18 Mar 2025 12:18:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 34231280001; Tue, 18 Mar 2025 12:18:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 231BD280002; Tue, 18 Mar 2025 12:18:27 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 034A2280001 for ; Tue, 18 Mar 2025 12:18:26 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 217C31CC7EF for ; Tue, 18 Mar 2025 16:18:28 +0000 (UTC) X-FDA: 83235179496.25.5B94F9A Received: from mail-wr1-f74.google.com (mail-wr1-f74.google.com [209.85.221.74]) by imf28.hostedemail.com (Postfix) with ESMTP id 82B19C0027 for ; Tue, 18 Mar 2025 16:18:26 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=oMo5fYkQ; spf=pass (imf28.hostedemail.com: domain of 30ZzZZwUKCLYpWXXWckkcha.Ykihejqt-iigrWYg.knc@flex--tabba.bounces.google.com designates 209.85.221.74 as permitted sender) smtp.mailfrom=30ZzZZwUKCLYpWXXWckkcha.Ykihejqt-iigrWYg.knc@flex--tabba.bounces.google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742314706; 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:in-reply-to: references:dkim-signature; bh=Ir59kQogB5jFvbq+93QLyhoRValCx40G+m5aMnPBZOw=; b=02iNsfRX+UHtqppK0M/Z/1sGhTK3CnEsJHbwXBfAIxnoLc9Bvaru3SV9wveQ/LD+nZ1jfX kde3EgiNsnw0L23cczCzyACoaTnGxsf7r+D/UQGWgwVo5wVREN/TKYHqK5kE1VHy21h9+z cNFu5xet8DlxnBazgS6La1wRaztX3DI= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=oMo5fYkQ; spf=pass (imf28.hostedemail.com: domain of 30ZzZZwUKCLYpWXXWckkcha.Ykihejqt-iigrWYg.knc@flex--tabba.bounces.google.com designates 209.85.221.74 as permitted sender) smtp.mailfrom=30ZzZZwUKCLYpWXXWckkcha.Ykihejqt-iigrWYg.knc@flex--tabba.bounces.google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742314706; a=rsa-sha256; cv=none; b=VStdHphrK2CJe93bTslb8KNnU8rVCSmlyK/gdD3sqSsd8ri0zPHU13kNO9fghPsAIZPN0N ge3oFjbyE0KTSs0FSCWrfPYXLy3nJxQHlKLCJT4S4Z8rjl/M4TPJoPIFkEUKzXgXnL6Jrt Jyt9tr1oIii1CcyNirDAhZwWSZh3L0s= Received: by mail-wr1-f74.google.com with SMTP id ffacd0b85a97d-3912a0439afso2631381f8f.3 for ; Tue, 18 Mar 2025 09:18:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1742314705; x=1742919505; darn=kvack.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=Ir59kQogB5jFvbq+93QLyhoRValCx40G+m5aMnPBZOw=; b=oMo5fYkQtjEcsJSXf6/hHuh9G2oHxaSpuGki3I9XH81xwCYkvlA6HS1adq9VWngso5 xZEY3L6w+9dtX50FeqXjP7eVIBMpppzxReaxiKaVTvaIuh65JBtOqp+r/Gg0S2kRp3hk g1b+BVEKayG8EW/fIKVjPn6ZQFSjbNeMIJIUZCyzuISIq05EDa+GwxTEG3LcLUNZZU6M rchy+hVqvfIKVG0IwxiSgIwAuaAqJJdZ5Q2CJLnCRv7DW/ptJkqPNc6Hf6k6ReN6uZgj H4Hwb4ah2GoFYYIXNaPBxI+A6hDGjtgemmR2J1JdaKV+D9VDgAKAo/VvtS9cnFjf3tBv GSLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742314705; x=1742919505; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Ir59kQogB5jFvbq+93QLyhoRValCx40G+m5aMnPBZOw=; b=JHPHUb2I00IN+I6jFciS8L7/bI7IRbT/dNy6hp2NiV1G9EoL6ii3Koqihrn+45c6Vv TFoKcWs8BgqyinP5KzBnFpbs3Q85rsM7QHjUVCp19FJaxjyBHEmZ6+Cl2he1QOOUFR71 BlMy15EhN6O1xvzkKh4NMNRDcoqtjKgIWlS37nsrYoUBrGaTdEJLBhaWI2TX9TOPjgyh qwaxwOS0PBeRkEQEWXS9xPnUPqKKSu7tkXhgBeQtpNxO/DcO1AHN+JlT445NaIQzWjWK ScE0/FJBnpAPD/OwbCTHIDpiqbcn3MY9BeEXqWqAZgkKUHJ44sbhEfBP5EHSoVhUtRYE +JQw== X-Forwarded-Encrypted: i=1; AJvYcCXsSg3HT4kIHMxaCt+AEPmw9DWOHk74ht6rqC9rQRSG3YshdnO8cfWvl4oaUUuEeVVft0Hv0pMPLA==@kvack.org X-Gm-Message-State: AOJu0Yz5KuGZvwCH8uIDUqnveuttODWQkYomy+9Z6oNwT9EVoiZ4IGF/ 8extAHgXD4y5k+nFBt9tly2iD77BxfvA4Bp5qzf1uXdgSSihex01s6W6ZmIKc6qsXKYqxIZTKQ= = X-Google-Smtp-Source: AGHT+IHb487+BvontEArNfyNxjH1CxF20OtRn/FgWb9LSiqLeRuLnLUB21OFCh3NW6hXbiFjnsY3KBFrYg== X-Received: from wmbgx13.prod.google.com ([2002:a05:600c:858d:b0:43b:bd03:5d2]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a5d:648c:0:b0:390:f6aa:4e80 with SMTP id ffacd0b85a97d-3996b4a1e7fmr4379310f8f.53.1742314705084; Tue, 18 Mar 2025 09:18:25 -0700 (PDT) Date: Tue, 18 Mar 2025 16:18:14 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.49.0.rc1.451.g8f38331e32-goog Message-ID: <20250318161823.4005529-1-tabba@google.com> Subject: [PATCH v7 0/9] KVM: Mapping guest_memfd backed memory at the host for software protected VMs From: Fuad Tabba To: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org Cc: pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, david@redhat.com, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, tabba@google.com X-Rspam-User: X-Rspamd-Queue-Id: 82B19C0027 X-Rspamd-Server: rspam08 X-Stat-Signature: ct6ni356pacpnyjhyqteiqfibur8dghw X-HE-Tag: 1742314706-275799 X-HE-Meta: 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 VtOdW5rs 7mYECPRCUSRhzbU6/HPY+YZdIve1fZqg5r2NbWhUM7uv5hSKJ9VcBK2lh8sJDMVXVNqQjBTnwCziosssgjk+1rMmF6Eq0PQSRPN+Ow0xdSP6cAbY1EvFl4E6oA698vyNC1lWpfjhsNg0GyuMKsCRpj9J1E1/U+xQGCCWha0GlUZcF2jX1YP2bFhyzi7A2ct8ojalXeGkXGZKVxTec51k9BRth9zORMq5qxAZFSdhicGuwtOJItHbCF2VhAnw57XBQsIMxqF3phSMjFy6Hf8abfsr8p/dPYQUgyQ/zAxsyz3c2ht5x8QUwhlCeDj9Ww4MEF7qKNi4jzmqz4ZYMPDSOp0dc29u9yYczQcnMCKpqe79+KxQ= X-Bogosity: Ham, tests=bogofilter, spamicity=0.002199, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Main changes since v6 [1]: - Fix and simplify handling of final folio_put() callback in case underlying file is no longer associated with guestmem, e.g., KVM module unloaded (Ackerley, Vlastimil) - Removed dependency on folio lock when not needed (Ackerley) - Carried acks (DavidH, Vlastimil) - Rebased on Linux 6.14-rc7 The purpose of this series is to serve as a base for _restricted_ mmap() support for guest_memfd backed memory at the host [2]. It allows experimentation with what that support would be like in the safe environment of software and non-confidential VM types. For more background and for how to test this series, please refer to v2 [3]. Note that an updated version of kvmtool that works with this series is available here [4]. I'm done respinning the series that tracks folio sharing [5]. I'll post that one right after this one. Cheers, /fuad [1] https://lore.kernel.org/all/20250312175824.1809636-1-tabba@google.com/ [2] https://lore.kernel.org/all/20250117163001.2326672-1-tabba@google.com/ [3] https://lore.kernel.org/all/20250129172320.950523-1-tabba@google.com/ [4] https://android-kvm.googlesource.com/kvmtool/+/refs/heads/tabba/guestmem-6.14 [5] https://lore.kernel.org/all/20250117163001.2326672-1-tabba@google.com/ Fuad Tabba (9): mm: Consolidate freeing of typed folios on final folio_put() KVM: guest_memfd: Handle final folio_put() of guest_memfd pages KVM: guest_memfd: Allow host to map guest_memfd() pages KVM: guest_memfd: Handle in-place shared memory as guest_memfd backed memory KVM: x86: Mark KVM_X86_SW_PROTECTED_VM as supporting guest_memfd shared memory KVM: arm64: Refactor user_mem_abort() calculation of force_pte KVM: arm64: Handle guest_memfd()-backed guest page faults KVM: arm64: Enable mapping guest_memfd in arm64 KVM: guest_memfd: selftests: guest_memfd mmap() test when mapping is allowed arch/arm64/include/asm/kvm_host.h | 12 ++ arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/mmu.c | 76 +++++++----- arch/x86/include/asm/kvm_host.h | 5 + arch/x86/kvm/Kconfig | 3 +- include/linux/kvm_host.h | 23 +++- include/linux/page-flags.h | 31 +++++ include/uapi/linux/kvm.h | 1 + mm/debug.c | 1 + mm/swap.c | 52 ++++++++- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/guest_memfd_test.c | 75 +++++++++++- virt/kvm/Kconfig | 4 + virt/kvm/guest_memfd.c | 109 ++++++++++++++++++ virt/kvm/kvm_main.c | 9 +- 15 files changed, 357 insertions(+), 46 deletions(-) base-commit: 4701f33a10702d5fc577c32434eb62adde0a1ae1