From patchwork Fri Oct 27 18:22:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13439047 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 88BB5C25B48 for ; Fri, 27 Oct 2023 18:46:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235116AbjJ0SqV (ORCPT ); Fri, 27 Oct 2023 14:46:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232615AbjJ0SqU (ORCPT ); Fri, 27 Oct 2023 14:46:20 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8F1D1712 for ; Fri, 27 Oct 2023 11:23:35 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-59b5a586da6so22568777b3.1 for ; Fri, 27 Oct 2023 11:23:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1698431011; x=1699035811; darn=vger.kernel.org; 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=sbbTeqIjFnESn/3c//KYIg/yBP25ARIIaxIo9NdR+Rs=; b=Qw6WSuDYMKlXoZNL//7NttWV+f/h0XS9ecZBkKBuo9Z7djWQrBQgPUdxxP2+0o3Nm1 C0SbyRJGUGOr7B3YaQBYLnYR0nP3OqJjmUanH4n1HfFBsPKBmGfaVkCT5N++dmI6qYkS jTNemriUA9g1t+DncIGY4vVXdWhS2tK3tn6fGFmsaseZDECcAnqliEQYcSZAKB7DJupd MlJT6zRO8PVlcM11JXMb8CQLo8HHHcSipR2qALydyJjtldhNbrin1Z9pAmNsaGWL9G/c M2f5n80fMMEKN6njw3YRP3MI4OrR4fIp7o23XuMz3MRIVF0kxMFt6tK74LznNNzEFLZX qCYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698431011; x=1699035811; 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=sbbTeqIjFnESn/3c//KYIg/yBP25ARIIaxIo9NdR+Rs=; b=gqGg4eVCiIO2RAs8XT4RPjFmkEEVMjdF9R5xGRDW1S1hwwr+eDydtQICRvAgq6YinW hlPb944MZ/Hg1xpmZ5cYLyamzwkRq9SZOrUpiu+RnWZ3nGUZn9SJWDu5iypCuPqRwYXd usjH72D0tNzN6h3PrQ2afZdz2PYO8lFFvtuh2mSCKVh6xEZ6sXaxRsirvmReswmjECjQ e0W2fF646HCT18f6eCt8BK7HhL2/UETCo2uWw6TLEKlgD8YF+ip+UvrR/XxA15EikbWg YIjIDYZWjmY3soSCc/5h2VV3Zkm2mbfRWFP5rexpKJH/hV1yFl2+mgryLZtHzF2Kligp R/Kw== X-Gm-Message-State: AOJu0YxO0NfQ2nF1Fwt3ZgXuWy/YAFNomvmB/yPRAY3p72asxbY2RKaY ZUyC4SZh4d5C13JdM8//A3DcsRR/etk= X-Google-Smtp-Source: AGHT+IHBWIjPxzRJgKiud97ZCtykjvc4+klLDW+Sn0Y068ZaDLScSJEVBpBXvLWKn1zDVFylTXJJKJ/wubw= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a0d:ca0f:0:b0:59b:e663:23b0 with SMTP id m15-20020a0dca0f000000b0059be66323b0mr102894ywd.4.1698431011148; Fri, 27 Oct 2023 11:23:31 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 27 Oct 2023 11:22:15 -0700 In-Reply-To: <20231027182217.3615211-1-seanjc@google.com> Mime-Version: 1.0 References: <20231027182217.3615211-1-seanjc@google.com> X-Mailer: git-send-email 2.42.0.820.g83a721a137-goog Message-ID: <20231027182217.3615211-34-seanjc@google.com> Subject: [PATCH v13 33/35] 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 , 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?q?Micka=C3=ABl_Sala?= =?utf-8?q?=C3=BCn?= " , Vlastimil Babka , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org 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 | 100 ++++++++++++++++++ 2 files changed, 110 insertions(+) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index 8ec122f5fcc8..e4d2cd9218b2 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -819,6 +819,16 @@ static inline struct kvm_vm *vm_create_barebones(void) return ____vm_create(VM_SHAPE_DEFAULT); } +static inline struct kvm_vm *vm_create_barebones_protected_vm(void) +{ + const struct vm_shape shape = { + .mode = VM_MODE_DEFAULT, + .type = 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/testing/selftests/kvm/set_memory_region_test.c index b32960189f5f..ca83e3307a98 100644 --- a/tools/testing/selftests/kvm/set_memory_region_test.c +++ b/tools/testing/selftests/kvm/set_memory_region_test.c @@ -385,6 +385,98 @@ static void test_add_max_memory_regions(void) kvm_vm_free(vm); } + +static void test_invalid_guest_memfd(struct kvm_vm *vm, int memfd, + size_t offset, const char *msg) +{ + int r = __vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_PRIVATE, + MEM_REGION_GPA, MEM_REGION_SIZE, + 0, memfd, offset); + TEST_ASSERT(r == -1 && errno == 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 = 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 = kvm_memfd_alloc(MEM_REGION_SIZE, false); + test_invalid_guest_memfd(vm, memfd, 0, "Regular memfd() should fail"); + close(memfd); + + vm2 = vm_create_barebones_protected_vm(); + memfd = vm_create_guest_memfd(vm2, MEM_REGION_SIZE, 0); + test_invalid_guest_memfd(vm, memfd, 0, "Other VM's guest_memfd() should fail"); + + 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 = vm_create_guest_memfd(vm, MEM_REGION_SIZE, 0); + for (i = 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 = vm_create_barebones_protected_vm(); + + memfd = 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 = __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 == -1 && errno == EEXIST, "%s", + "Overlapping guest_memfd() bindings should fail with EEXIST"); + + /* And now the back half of the other slot. */ + r = __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 == -1 && errno == 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__ @@ -401,6 +493,14 @@ int main(int argc, char *argv[]) test_add_max_memory_regions(); + if (kvm_has_cap(KVM_CAP_GUEST_MEMFD) && + (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 = atoi_positive("Number of iterations", argv[1]);