From nobody Mon Feb 9 06:34:45 2026 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 E8261C001DC for ; Tue, 18 Jul 2023 23:53:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231703AbjGRXxx (ORCPT ); Tue, 18 Jul 2023 19:53:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231700AbjGRXwy (ORCPT ); Tue, 18 Jul 2023 19:52:54 -0400 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 767753A9C for ; Tue, 18 Jul 2023 16:50:22 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id d9443c01a7336-1b8a4571c1aso33129845ad.0 for ; Tue, 18 Jul 2023 16:50:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1689724163; x=1692316163; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=rKvKKloUVvRbyK7Yz9l+FaUDBRsuXKkZHJmkKN7bi2Y=; b=EcELT5GqQbnbtfycTUnPewJaz2g/HV9AKkO3JNwzTK5uuMisxIn1WXx7YTmbjsQ+XX SDXAGUMBTiOn2FUH3qvEgk9rfsh+jdvFnBl1T8a1rL9ik/6x/Jikv7649Is1PpM4BQ17 UtlDaSpo7OWPyOfIwkwyTxKFboN5htIa080od6JiwJUwpVFyOuq3uvwYJALuMoIA26MB r8Co4xPfs/9EJrO92UTiJyXzb+Jvnd6fmIjfIYKkVG9a/mBtJLUwQ6N3rJdy7g4z22zt Ygw1MQq7binRXHRVL1uS1Skbzt/nZzsALBROODqMohefttmXusLD/6T0/f1hYzjMb7FW vGvw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689724163; x=1692316163; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=rKvKKloUVvRbyK7Yz9l+FaUDBRsuXKkZHJmkKN7bi2Y=; b=RhI0oqQXc8B7Ku1XXSdhnkViS5deGlovynfTlJDr+07T3G4Nn9pP83EolQ58wTfNZk caRS+1WbIxXw5P8TohMsFhvJsA8cDP6Wn+29zexFMZEk1uCt4FM7yI1kI9nZU/qbA9bP 05PseVVNN2FIZ8N1NCsvV4qhDAnVJmhK7t0fslfAoYcgP7N+GrC1mHQBFaAtI0Frj+TI YceccPWt7Pf9xnThgOQm7hlfyxM5ZqLPpvsNSCVWEC5W6Cbq8KmiNeSqGoVTMs6RHH06 tUMAEYdsOQLKn4XMf6z+SZGXfA94sLUDTLRLesLgFoV1bA/I/oej5C6AxCLoq+7CN7mf J4fg== X-Gm-Message-State: ABy/qLZjMupcUbFYSRaBJ6BHiv6wOEvUDDIxBc/iSmBx7yPgHAgMCRIn erXL7mt8LQUL8i6UYnqyRJuCUpmxGNE= X-Google-Smtp-Source: APBJJlFbJO/Hk1I/Rl2qqMZ4yuUcIy3+1AWTLJTDX9bCulv0CF4luI/t69zZ9PixxI+uL49XmU3+g1rdNDk= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:902:ec8c:b0:1b8:95fc:d0f with SMTP id x12-20020a170902ec8c00b001b895fc0d0fmr7824plg.7.1689724163589; Tue, 18 Jul 2023 16:49:23 -0700 (PDT) Reply-To: Sean Christopherson Date: Tue, 18 Jul 2023 16:45:10 -0700 In-Reply-To: <20230718234512.1690985-1-seanjc@google.com> Mime-Version: 1.0 References: <20230718234512.1690985-1-seanjc@google.com> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog Message-ID: <20230718234512.1690985-28-seanjc@google.com> Subject: [RFC PATCH v11 27/29] KVM: selftests: Expand set_memory_region_test to validate guest_memfd() From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , "Matthew Wilcox (Oracle)" , Andrew Morton , Paul Moore , James Morris , "Serge E. Hallyn" 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-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Chao Peng , Fuad Tabba , Jarkko Sakkinen , Yu Zhang , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , Vlastimil Babka , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Chao Peng Expand set_memory_region_test to exercise various positive and negative testcases for private memory. - Non-guest_memfd() file descriptor for private memory - guest_memfd() from different VM - Overlapping bindings - Unaligned bindings Signed-off-by: Chao Peng Co-developed-by: Ackerley Tng Signed-off-by: Ackerley Tng [sean: trim the testcases to remove duplicate coverage] Signed-off-by: Sean Christopherson --- .../selftests/kvm/include/kvm_util_base.h | 10 ++ .../selftests/kvm/set_memory_region_test.c | 99 +++++++++++++++++++ 2 files changed, 109 insertions(+) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/te= sting/selftests/kvm/include/kvm_util_base.h index 334df27a6f43..39b38c75b99c 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -789,6 +789,16 @@ static inline struct kvm_vm *vm_create_barebones(void) return ____vm_create(VM_SHAPE_DEFAULT); } =20 +static inline struct kvm_vm *vm_create_barebones_protected_vm(void) +{ + const struct vm_shape shape =3D { + .mode =3D VM_MODE_DEFAULT, + .type =3D KVM_X86_SW_PROTECTED_VM, + }; + + return ____vm_create(shape); +} + static inline struct kvm_vm *vm_create(uint32_t nr_runnable_vcpus) { return __vm_create(VM_SHAPE_DEFAULT, nr_runnable_vcpus, 0); diff --git a/tools/testing/selftests/kvm/set_memory_region_test.c b/tools/t= esting/selftests/kvm/set_memory_region_test.c index a849ce23ca97..ca2ca6947376 100644 --- a/tools/testing/selftests/kvm/set_memory_region_test.c +++ b/tools/testing/selftests/kvm/set_memory_region_test.c @@ -382,6 +382,98 @@ static void test_add_max_memory_regions(void) kvm_vm_free(vm); } =20 + +static void test_invalid_guest_memfd(struct kvm_vm *vm, int memfd, + size_t offset, const char *msg) +{ + int r =3D __vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_PRIVA= TE, + MEM_REGION_GPA, MEM_REGION_SIZE, + 0, memfd, offset); + TEST_ASSERT(r =3D=3D -1 && errno =3D=3D EINVAL, "%s", msg); +} + +static void test_add_private_memory_region(void) +{ + struct kvm_vm *vm, *vm2; + int memfd, i; + + pr_info("Testing ADD of KVM_MEM_PRIVATE memory regions\n"); + + vm =3D vm_create_barebones_protected_vm(); + + test_invalid_guest_memfd(vm, vm->kvm_fd, 0, "KVM fd should fail"); + test_invalid_guest_memfd(vm, vm->fd, 0, "VM's fd should fail"); + + memfd =3D kvm_memfd_alloc(MEM_REGION_SIZE, false); + test_invalid_guest_memfd(vm, vm->fd, 0, "Regular memfd() should fail"); + close(memfd); + + vm2 =3D vm_create_barebones_protected_vm(); + memfd =3D vm_create_guest_memfd(vm2, MEM_REGION_SIZE, 0); + test_invalid_guest_memfd(vm, memfd, 0, "Other VM's guest_memfd() should f= ail"); + + vm_set_user_memory_region2(vm2, MEM_REGION_SLOT, KVM_MEM_PRIVATE, + MEM_REGION_GPA, MEM_REGION_SIZE, 0, memfd, 0); + close(memfd); + kvm_vm_free(vm2); + + memfd =3D vm_create_guest_memfd(vm, MEM_REGION_SIZE, 0); + for (i =3D 1; i < PAGE_SIZE; i++) + test_invalid_guest_memfd(vm, memfd, i, "Unaligned offset should fail"); + + vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_PRIVATE, + MEM_REGION_GPA, MEM_REGION_SIZE, 0, memfd, 0); + close(memfd); + + kvm_vm_free(vm); +} + +static void test_add_overlapping_private_memory_regions(void) +{ + struct kvm_vm *vm; + int memfd; + int r; + + pr_info("Testing ADD of overlapping KVM_MEM_PRIVATE memory regions\n"); + + vm =3D vm_create_barebones_protected_vm(); + + memfd =3D vm_create_guest_memfd(vm, MEM_REGION_SIZE * 4, 0); + + vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_PRIVATE, + MEM_REGION_GPA, MEM_REGION_SIZE * 2, 0, memfd, 0); + + vm_set_user_memory_region2(vm, MEM_REGION_SLOT + 1, KVM_MEM_PRIVATE, + MEM_REGION_GPA * 2, MEM_REGION_SIZE * 2, + 0, memfd, MEM_REGION_SIZE * 2); + + /* + * Delete the first memslot, and then attempt to recreate it except + * with a "bad" offset that results in overlap in the guest_memfd(). + */ + vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_PRIVATE, + MEM_REGION_GPA, 0, NULL, -1, 0); + + /* Overlap the front half of the other slot. */ + r =3D __vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_PRIVATE, + MEM_REGION_GPA * 2 - MEM_REGION_SIZE, + MEM_REGION_SIZE * 2, + 0, memfd, 0); + TEST_ASSERT(r =3D=3D -1 && errno =3D=3D EEXIST, "%s", + "Overlapping guest_memfd() bindings should fail with EEXIST"); + + /* And now the back half of the other slot. */ + r =3D __vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_PRIVATE, + MEM_REGION_GPA * 2 + MEM_REGION_SIZE, + MEM_REGION_SIZE * 2, + 0, memfd, 0); + TEST_ASSERT(r =3D=3D -1 && errno =3D=3D EEXIST, "%s", + "Overlapping guest_memfd() bindings should fail with EEXIST"); + + close(memfd); + kvm_vm_free(vm); +} + int main(int argc, char *argv[]) { #ifdef __x86_64__ @@ -398,6 +490,13 @@ int main(int argc, char *argv[]) =20 test_add_max_memory_regions(); =20 + if (kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM)) { + test_add_private_memory_region(); + test_add_overlapping_private_memory_regions(); + } else { + pr_info("Skipping tests for KVM_MEM_PRIVATE memory regions\n"); + } + #ifdef __x86_64__ if (argc > 1) loops =3D atoi_positive("Number of iterations", argv[1]); --=20 2.41.0.255.g8b1d071c50-goog