From patchwork Wed Mar 12 17:58:13 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fuad Tabba X-Patchwork-Id: 14013726 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 D7B79C28B2E for ; Wed, 12 Mar 2025 17:58:30 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 27321280002; Wed, 12 Mar 2025 13:58:29 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2231C280001; Wed, 12 Mar 2025 13:58:29 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0C4CF280002; Wed, 12 Mar 2025 13:58:29 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id DF303280001 for ; Wed, 12 Mar 2025 13:58:28 -0400 (EDT) Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 356161C78C7 for ; Wed, 12 Mar 2025 17:58:29 +0000 (UTC) X-FDA: 83213658738.08.270D989 Received: from mail-wm1-f74.google.com (mail-wm1-f74.google.com [209.85.128.74]) by imf17.hostedemail.com (Postfix) with ESMTP id 7178D40008 for ; Wed, 12 Mar 2025 17:58:27 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=JX1nH77r; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf17.hostedemail.com: domain of 3QcvRZwUKCGQVCDDCIQQING.EQONKPWZ-OOMXCEM.QTI@flex--tabba.bounces.google.com designates 209.85.128.74 as permitted sender) smtp.mailfrom=3QcvRZwUKCGQVCDDCIQQING.EQONKPWZ-OOMXCEM.QTI@flex--tabba.bounces.google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1741802307; a=rsa-sha256; cv=none; b=BNmP8Q3n9B6Ogoq4JNb/fwjCB3BLL3Ws+Qwmo7+7tjAOjSiKRcmXPVZjmtmLKEgwufpHaH Yg6VWVcO6I0Ifh3x0Ebp8X/WoZTXPzfTu2U+obcvqZe0z5uM6Saffzpz7LnnRqJIi469+p tqLQ76BBz63Pl7ORFQACmP5yqwoQIRA= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=JX1nH77r; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf17.hostedemail.com: domain of 3QcvRZwUKCGQVCDDCIQQING.EQONKPWZ-OOMXCEM.QTI@flex--tabba.bounces.google.com designates 209.85.128.74 as permitted sender) smtp.mailfrom=3QcvRZwUKCGQVCDDCIQQING.EQONKPWZ-OOMXCEM.QTI@flex--tabba.bounces.google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1741802307; 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=T+kF5w3og5RX654YVuAmymqDU+eQn2jhpTLFEYKtVFM=; b=gfMQyulHd+D2DcQ1RxVQJZAjMvLY6msqjDy87Dwf7IunHJvrZcoi7kOZLhu6bq8+QcVhUC d/3QkcZGn5cGFwNqqezrAGX1pVgwfhrxJ6+qSxNWg8yYhjP2/CBHwM8UemZ1wYmfXmiCFK ESw2OCpgKjmuVM8a6ZsFb6KKxOzDp8o= Received: by mail-wm1-f74.google.com with SMTP id 5b1f17b1804b1-43cf3168b87so490885e9.2 for ; Wed, 12 Mar 2025 10:58:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1741802306; x=1742407106; darn=kvack.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=T+kF5w3og5RX654YVuAmymqDU+eQn2jhpTLFEYKtVFM=; b=JX1nH77rmiZKcpHkfj9+shUDZyPPDIuYBW3DdUmtpZeErdjg0b6gADZ1NR2jXTDdMr Yi48MxZMalviUcVOxUugeeyr6LA/UD5SdvyilnIZrnK1MH7yT3P8P/bY1EA/v1GJDu3U Ssgj0FgtV9gxPvkQmEF4ecewM/uFsIQfhMPckCZGQ5pebUB6dLVaJL1FZbjRsryvTSxU 7I7dSoIhcBneVkRcZoi2itmGF9DSO9NIBvCo/TB70oc7Zw1xqFbva0dbYHxPl996od/i E8qUwiRCsehrthpY4DdhkBsBIAkDLOvr5MGRGSN0Eq4iJtRv/bH8WTsIVTgQ/2gbafw0 GUvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741802306; x=1742407106; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=T+kF5w3og5RX654YVuAmymqDU+eQn2jhpTLFEYKtVFM=; b=vhv+d23Umrw9tcXZKGC6UBZUA5Ry9mfjaNgjRq0n3AZEI+WRsYv0k0UmxKUdiPkEgb OnR/pxPIwsLudDD+Gn11GnkijFxdC20Q1w0vDrl1S7C986OG+Q6CwL4AHoJAcB0tILc9 22P5hg3+a0U7wsVSUhLHrh9mmeRsYKNO2jwt/jews3fY6szzMBEns0HoF7U32Vas10xS 4Vafz05FP0W4+yjtq7v4LKJvd8vVIykHnvicSS411cm7rrdKGSnI0f4C8QFnT6tJMcPD 1uTpyL7K0rnyk2Q+L60s3H3nZMKBKPbnmXH1U6gha6/SobV0q5fbnmtP4klk5S7Z9z1x 8Dig== X-Forwarded-Encrypted: i=1; AJvYcCVMxCmXr74+Y9gvwABJpqDfJ6vic23D4qPjJqPuFh40Jtbm3E4SHeaqsQMLTi887UWyeWr8748CVQ==@kvack.org X-Gm-Message-State: AOJu0Yx//Mkp/f2weyZJSGlDIgg9LTVdsQqevoisRktAA23j1xCa5oW0 SJu0FEcsc5xwZPUazj8OtC3tb6yyI69zZNGDDaH38l5NhhTeICJv16gRLsN5WIlARIAFAA2GGg= = X-Google-Smtp-Source: AGHT+IGKQg3O4SCw85tnpOl0usGIncjUMzcuT/BH9Y2E5wJm1iFi5IZwbAkFv8L1tYWF+lXsTpj6WD6wJQ== X-Received: from wmbgz9-n2.prod.google.com ([2002:a05:600c:8889:20b0:43c:fcbd:f2eb]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:3658:b0:43c:f1b8:16ad with SMTP id 5b1f17b1804b1-43d09ecf46dmr33038605e9.30.1741802305683; Wed, 12 Mar 2025 10:58:25 -0700 (PDT) Date: Wed, 12 Mar 2025 17:58:13 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.49.0.rc0.332.g42c0ae87b1-goog Message-ID: <20250312175824.1809636-1-tabba@google.com> Subject: [PATCH v6 00/10] 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: 7178D40008 X-Stat-Signature: ohcx19pwrxyp93soa51cju9dmu87hps5 X-Rspamd-Server: rspam06 X-HE-Tag: 1741802307-189267 X-HE-Meta: U2FsdGVkX19OIsmms7ezUONzCq5AJ+Omn/EgaqK4/WQChiGJrZHSxUkt0MyzwXCqdGbRlrBWX5FrSWatyA3n44N9SLdsM/7Rw5sDxtB7Pv96/cs9orxnnLF3t4cDdyPDePWhB2+YCubxbvC/ITmj4JpwoQefQkxa8PCmPMfwlsksFc5EzEYj18KUxDeSNgQwFbj9PD561hRyxvM1SDz0JIQg+qIew29hGAs0rfgXR787q17I8EUlG/bOKFtuBIoQJ8FBWwmd4VrVa3r6WiYDAsLu1c3TESquwKEcpp1T+tmvqL37JM9EKg4cPaZs4WW+5QOOpAcWhA42m1nPI8Dyx2ZYDtbpKnXS9AQG/6zV57EDvmFu2Kl5L34MR9Z2Tosb1hQqPJ+qmdmScUqmgsFJZ66zTHHcfxcStkx8WEEtMcxeTK4Y7azaLP7KbsVp8EfJZYjkskuFG5CZdO6P2yjC7rPn3DgXS1i+Ui6EFCruSgfgA7IY3egntvqhXa7VRES55LQ4N+yhx0q3SFDi8ryhOSwIcizgLKr/LUCtm8sw09K8PXQcpTa4+BmR2FGNusq9HTB8Wy+Cg9kG0G+nGps53qT/Ya9jYJRuxl5dMxJBcaTQF1ZDH74YptSoX4EhepKQmYqNYoxqnCw3BxWtPLNQrCTG4CM+NU1y9fGMU/sR++8hdyRRjfWQvAcecCodCGXzu/CPzVbKnF1ER9wT7A+j5dLAHaI60Jwcy/d/4sL/19Z/wbKwr93BKHBh3fpTs5fWXt1dACJD68B3fzQc7ZYloMCYA+1Cbn7KEQ0WKW7kRm1m5OuVRgnDc/pTdchqPPjjqwDk5iyHhsmst/aB1GDkLeaQ4T90UaYVEiiw5brj3ckspolVthDoJfaax33pRq99afcQSriOxV4zwTHSk8nCCQv8Mf4X0qHR1TwQksNowBJqYj3JN+PajjGHy5I1KmbRrbbc7lJqbaDMWrDeRCG vn2/+Rj6 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000039, 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 v5 [1]: - Added handling of folio_put() when KVM is configured as a module - KVM_GMEM_SHARED_MEM is orthogonal to KVM_GENERIC_MEMORY_ATTRIBUTES (Ackerley) - kvm_gmem_offset_is_shared() takes folio as parameter to check locking (Kirill) - Refactoring and fixes from comments on previous version - Rebased on Linux 6.14-rc6 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 working on respinning the series that tracks folio sharing [5]. I'll post that one soon. Cheers, /fuad [1] https://lore.kernel.org/all/20250303171013.3548775-1-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 (10): mm: Consolidate freeing of typed folios on final folio_put() KVM: guest_memfd: Handle final folio_put() of guest_memfd pages KVM: guest_memfd: Handle kvm_gmem_handle_folio_put() for KVM as a module 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 | 10 ++ 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 | 50 +++++++- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/guest_memfd_test.c | 75 +++++++++++- virt/kvm/Kconfig | 4 + virt/kvm/guest_memfd.c | 110 ++++++++++++++++++ virt/kvm/kvm_main.c | 9 +- 15 files changed, 354 insertions(+), 46 deletions(-) base-commit: 80e54e84911a923c40d7bee33a34c1b4be148d7a