From patchwork Mon Dec 5 23:23:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vishal Annapurve X-Patchwork-Id: 631206 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 BF40FC4708C for ; Mon, 5 Dec 2022 23:24:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231715AbiLEXX4 (ORCPT ); Mon, 5 Dec 2022 18:23:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231736AbiLEXXy (ORCPT ); Mon, 5 Dec 2022 18:23:54 -0500 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 8B710186C3 for ; Mon, 5 Dec 2022 15:23:52 -0800 (PST) Received: by mail-pl1-x649.google.com with SMTP id t1-20020a170902b20100b001893ac9f0feso14703503plr.4 for ; Mon, 05 Dec 2022 15:23:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=p+JG7vhmV9GUu5EiNhTdgbdj//f06sfIcTQ9m3fXDF0=; b=cixBn0wVZpdFwMZWW+rTFy8ERYpD6APzLj8RHuIbJ5ngkVGi2keKWhT8Wxchco4RCm 8h6OdOeqAItmKu6pa4r9cvPQvxcLjauSb8tOxOmF1GvkX6FoX4Jbuz+XAPqCv0Bp7/1m dZWTFEz7Urk9M44dTu7NigncLx7+GuQFcJijsb50bzrQShFoXXBOrMuUCG5kXfHP6UZk ZudLvzPyfP37ONSbGbfwaVy0CJkDtFs9mBvfNpSKuSv+iE6zoO/Y27JnVHepI+Cc/DDU gIxPEitwkxqdbt4c8Wd7/yskua2HUG8LJieH98GEin5IHa10RZgl/E73cfd+SI+hWJWv ECWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=p+JG7vhmV9GUu5EiNhTdgbdj//f06sfIcTQ9m3fXDF0=; b=sa/eUypcwfbNyaww67O9/RNN9PAnSfZUEXkLRi7L99bjN6itn69U2UOVAdTLQOhBQw EbwzQq/K+PZEa1VqVBkSrlXiStEw9mN8CcJ9nX9btecl5EPTV7xWtd3K7kEfHCQl6KgF FODiBvSHEZHn3CVVniXLfaIZAy+HyJTbeBvwAjkkHTiUzHgVrbeXsrBgzXbTc92SRz1z 1X8jfbU9rlaRuGMCQQu0aWZniGCgW30e92d8kdAHfbiUDZr7Z0eTnBdLvj/F5HhC0Y+n q3X23YftMFO1gso7aQXxl+NtZqEEaJBoRySQU8918NeahB82RoQKAo78nTyas+CZwhR5 SYTQ== X-Gm-Message-State: ANoB5pmEvQSLkA8rSAFwHTaTh+OOAd0rFQEDFu4gcWZcvxnsG4eJ0YR2 51tM2URlanxw2Kb3qPRMMvczIkgdEO9bhmR4 X-Google-Smtp-Source: AA0mqf6KPBWF+YgblauyfVp/6IydFfj7MSowsTXNyF+RFFBHcs3Vjvqo/a/3WkMMhqDAdiWVjR17YEUCPRY/6Mtw X-Received: from vannapurve2.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:41f8]) (user=vannapurve job=sendgmr) by 2002:a17:90b:3594:b0:219:5b3b:760 with SMTP id mm20-20020a17090b359400b002195b3b0760mr32134253pjb.50.1670282632092; Mon, 05 Dec 2022 15:23:52 -0800 (PST) Date: Mon, 5 Dec 2022 23:23:37 +0000 In-Reply-To: <20221205232341.4131240-1-vannapurve@google.com> Mime-Version: 1.0 References: <20221205232341.4131240-1-vannapurve@google.com> X-Mailer: git-send-email 2.39.0.rc0.267.gcb52ba06e7-goog Message-ID: <20221205232341.4131240-3-vannapurve@google.com> Subject: [V2 PATCH 2/6] KVM: Selftests: Add support for private memory From: Vishal Annapurve To: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: pbonzini@redhat.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, shuah@kernel.org, yang.zhong@intel.com, ricarkol@google.com, aaronlewis@google.com, wei.w.wang@intel.com, kirill.shutemov@linux.intel.com, corbet@lwn.net, hughd@google.com, jlayton@kernel.org, bfields@fieldses.org, akpm@linux-foundation.org, chao.p.peng@linux.intel.com, yu.c.zhang@linux.intel.com, jun.nakajima@intel.com, dave.hansen@intel.com, michael.roth@amd.com, qperret@google.com, steven.price@arm.com, ak@linux.intel.com, david@redhat.com, luto@kernel.org, vbabka@suse.cz, marcorr@google.com, erdemaktas@google.com, pgonda@google.com, nikunj@amd.com, seanjc@google.com, diviness@google.com, maz@kernel.org, dmatlack@google.com, axelrasmussen@google.com, maciej.szmigiero@oracle.com, mizhang@google.com, bgardon@google.com, ackerleytng@google.com, Vishal Annapurve Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add support for registering private memory with kvm using KVM_SET_USER_MEMORY_REGION ioctl. Helper function to query extended userspace mem region is introduced to allow memory conversion. vm_mem_backing_src types is extended to contain additional guest memory source types to cover the cases where guest memory can be backed by both anonymous memory and restricted memfd. Signed-off-by: Vishal Annapurve --- .../selftests/kvm/include/kvm_util_base.h | 12 +++- .../testing/selftests/kvm/include/test_util.h | 4 ++ tools/testing/selftests/kvm/lib/kvm_util.c | 58 +++++++++++++++++-- tools/testing/selftests/kvm/lib/test_util.c | 11 ++++ 4 files changed, 78 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index c7685c7038ff..4ad99f295f2a 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -31,7 +31,10 @@ typedef uint64_t vm_paddr_t; /* Virtual Machine (Guest) physical address */ typedef uint64_t vm_vaddr_t; /* Virtual Machine (Guest) virtual address */ struct userspace_mem_region { - struct kvm_userspace_memory_region region; + union { + struct kvm_userspace_memory_region region; + struct kvm_userspace_memory_region_ext region_ext; + }; struct sparsebit *unused_phy_pages; int fd; off_t offset; @@ -196,7 +199,7 @@ static inline bool kvm_has_cap(long cap) #define kvm_do_ioctl(fd, cmd, arg) \ ({ \ - static_assert(!_IOC_SIZE(cmd) || sizeof(*arg) == _IOC_SIZE(cmd), ""); \ + static_assert(!_IOC_SIZE(cmd) || sizeof(*arg) >= _IOC_SIZE(cmd), ""); \ ioctl(fd, cmd, arg); \ }) @@ -384,6 +387,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags); void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa); void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot); + struct kvm_vcpu *__vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id); vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min); vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min); @@ -715,6 +719,10 @@ struct kvm_userspace_memory_region * kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start, uint64_t end); +struct kvm_userspace_memory_region_ext * +kvm_userspace_memory_region_ext_find(struct kvm_vm *vm, uint64_t start, + uint64_t end); + #define sync_global_to_guest(vm, g) ({ \ typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g)); \ memcpy(_p, &(g), sizeof(g)); \ diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h index 80d6416f3012..aea80071f2b8 100644 --- a/tools/testing/selftests/kvm/include/test_util.h +++ b/tools/testing/selftests/kvm/include/test_util.h @@ -103,6 +103,8 @@ enum vm_mem_backing_src_type { VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB, VM_MEM_SRC_SHMEM, VM_MEM_SRC_SHARED_HUGETLB, + VM_MEM_SRC_ANONYMOUS_AND_RESTRICTED_MEMFD, + VM_MEM_SRC_ANON_HTLB2M_AND_RESTRICTED_MEMFD, NUM_SRC_TYPES, }; @@ -110,7 +112,9 @@ enum vm_mem_backing_src_type { struct vm_mem_backing_src_alias { const char *name; + /* Flags applicable for normal host accessible guest memory */ uint32_t flag; + uint32_t need_restricted_memfd; }; #define MIN_RUN_DELAY_NS 200000UL diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 1d26a2160178..dba693d6446a 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -32,6 +32,11 @@ int open_path_or_exit(const char *path, int flags) return fd; } +static int memfd_restricted(unsigned int flags) +{ + return syscall(__NR_memfd_restricted, flags); +} + /* * Open KVM_DEV_PATH if available, otherwise exit the entire program. * @@ -582,6 +587,35 @@ __weak void vcpu_arch_free(struct kvm_vcpu *vcpu) } +/* + * KVM Userspace Memory Region Ext Find + * + * Input Args: + * vm - Virtual Machine + * start - Starting VM physical address + * end - Ending VM physical address, inclusive. + * + * Output Args: None + * + * Return: + * Pointer to overlapping ext region, NULL if no such region. + * + * Public interface to userspace_mem_region_find. Allows tests to look up + * the memslot datastructure for a given range of guest physical memory. + */ +struct kvm_userspace_memory_region_ext * +kvm_userspace_memory_region_ext_find(struct kvm_vm *vm, uint64_t start, + uint64_t end) +{ + struct userspace_mem_region *region; + + region = userspace_mem_region_find(vm, start, end); + if (!region) + return NULL; + + return ®ion->region_ext; +} + /* * VM VCPU Remove * @@ -881,6 +915,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, struct userspace_mem_region *region; size_t backing_src_pagesz = get_backing_src_pagesz(src_type); size_t alignment; + int restricted_memfd = -1; TEST_ASSERT(vm_adjust_num_guest_pages(vm->mode, npages) == npages, "Number of guest pages is not compatible with the host. " @@ -978,14 +1013,24 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, /* As needed perform madvise */ if ((src_type == VM_MEM_SRC_ANONYMOUS || - src_type == VM_MEM_SRC_ANONYMOUS_THP) && thp_configured()) { + src_type == VM_MEM_SRC_ANONYMOUS_THP || + src_type == VM_MEM_SRC_ANONYMOUS_AND_RESTRICTED_MEMFD) && + thp_configured()) { ret = madvise(region->host_mem, npages * vm->page_size, - src_type == VM_MEM_SRC_ANONYMOUS ? MADV_NOHUGEPAGE : MADV_HUGEPAGE); + (src_type == VM_MEM_SRC_ANONYMOUS_THP) ? + MADV_HUGEPAGE : MADV_NOHUGEPAGE); TEST_ASSERT(ret == 0, "madvise failed, addr: %p length: 0x%lx src_type: %s", region->host_mem, npages * vm->page_size, vm_mem_backing_src_alias(src_type)->name); } + if (vm_mem_backing_src_alias(src_type)->need_restricted_memfd) { + restricted_memfd = memfd_restricted(0); + TEST_ASSERT(restricted_memfd != -1, + "Failed to create restricted memfd"); + flags |= KVM_MEM_PRIVATE; + } + region->unused_phy_pages = sparsebit_alloc(); sparsebit_set_num(region->unused_phy_pages, guest_paddr >> vm->page_shift, npages); @@ -994,13 +1039,16 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, region->region.guest_phys_addr = guest_paddr; region->region.memory_size = npages * vm->page_size; region->region.userspace_addr = (uintptr_t) region->host_mem; - ret = __vm_ioctl(vm, KVM_SET_USER_MEMORY_REGION, ®ion->region); + region->region_ext.restricted_fd = restricted_memfd; + region->region_ext.restricted_offset = 0; + ret = ioctl(vm->fd, KVM_SET_USER_MEMORY_REGION, ®ion->region_ext); TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed,\n" " rc: %i errno: %i\n" " slot: %u flags: 0x%x\n" - " guest_phys_addr: 0x%lx size: 0x%lx", + " guest_phys_addr: 0x%lx size: 0x%lx restricted fd: %d\n", ret, errno, slot, flags, - guest_paddr, (uint64_t) region->region.memory_size); + guest_paddr, (uint64_t) region->region.memory_size, + restricted_memfd); /* Add to quick lookup data structures */ vm_userspace_mem_region_gpa_insert(&vm->regions.gpa_tree, region); diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index 5c22fa4c2825..d33b98bfe8a3 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -271,6 +271,16 @@ const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i) */ .flag = MAP_SHARED, }, + [VM_MEM_SRC_ANONYMOUS_AND_RESTRICTED_MEMFD] = { + .name = "anonymous_and_restricted_memfd", + .flag = ANON_FLAGS, + .need_restricted_memfd = 1, + }, + [VM_MEM_SRC_ANON_HTLB2M_AND_RESTRICTED_MEMFD] = { + .name = "anonymous_hugetlb_2mb_and_restricted_memfd", + .flag = ANON_HUGE_FLAGS | MAP_HUGE_2MB, + .need_restricted_memfd = 1, + }, }; _Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES, "Missing new backing src types?"); @@ -289,6 +299,7 @@ size_t get_backing_src_pagesz(uint32_t i) switch (i) { case VM_MEM_SRC_ANONYMOUS: case VM_MEM_SRC_SHMEM: + case VM_MEM_SRC_ANONYMOUS_AND_RESTRICTED_MEMFD: return getpagesize(); case VM_MEM_SRC_ANONYMOUS_THP: return get_trans_hugepagesz();