From patchwork Thu Sep 14 01:55:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13384086 X-Patchwork-Delegate: paul@paul-moore.com 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 774C6EE0212 for ; Thu, 14 Sep 2023 02:00:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234664AbjINCAq (ORCPT ); Wed, 13 Sep 2023 22:00:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58782 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234381AbjINB7r (ORCPT ); Wed, 13 Sep 2023 21:59:47 -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 EB7B43A9F for ; Wed, 13 Sep 2023 18:56:26 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id d9443c01a7336-1c1fe87fc29so4092085ad.0 for ; Wed, 13 Sep 2023 18:56:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1694656586; x=1695261386; 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=yQPra1dQiB3SthC1x0t7SGlDkIN4vOXtCvjVK4W5apc=; b=TdMYbtuFLGzrg9+YhxzJTvOj/Bg4p2VNaAzd3I3qEOPE5gO/Tf07JdQStwpG7ufQ0L FShE8UrgqImO8b6MqtuI7k0aw8W1SvFDDmRqx2wvqCl31oqLexq3VGFfJhCwu87BND9T A376jl/pWr4/WoD3DrXDCcRZsgscbNXeIG7CbXXHInwEPhw2/ULsvkOBDhkhGszV6QWM 9S7y1JtR4OQoCC4BskE2ncXU+M2CWBXHs6KmUlb8+dIFavtm6JYXnJCyg1JkpE3Ng/MY HGLgwkPYvQ1gLm+sjzgQBN0rnwlLXn12EKVuKLCwtV89+M4pYF2/3nE0s1jWvoQhmoQL v7iQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694656586; x=1695261386; 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=yQPra1dQiB3SthC1x0t7SGlDkIN4vOXtCvjVK4W5apc=; b=Oygks9Y7naTvvsl4KjyMusY0rQkOc73IBhJmD4iF6cfPLKwlpNZ9qlAdyQ3iTRRIcA OB/hFfq0g1FGrKjIp8z8A6CSLZfr+2/JkHCqtNaKa5RPTXrQe26ePJC3tsdyxET+GsYA 6ErFbUNMyVxlUYXkdFMny8yfwSU3kG9ZufYm4xUA9JVKmH/maUYV/+OApcfjKiLTU8Zk UqJmlFkA9F/t+osDstRnJjQwycxPaet++dBoqQQByocOUkVhccFII/eFCSBY6eTdpWII T0zi70E2gQp2HSxi/r2xnTYeOi7hWJODZgrHT4c7lMA/vtl1whnRxzr0CoEQ8Nf6843E vNCQ== X-Gm-Message-State: AOJu0YwH5FtiXcUp/VKRNwDj/Wbqwl+ZVmkiaaU+f+0pOur5oSz2zy29 ezh8ci3cG4k8bKng8pqDjsCqdJo99MY= X-Google-Smtp-Source: AGHT+IFAHhW5BZGO1uppfpot1pEr0aAhGs0ZmH0MKLDsA+afIocjRRcxvAD33MR5tv+EpN9UJvITdXcpd9o= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:902:da8e:b0:1c0:e87e:52b9 with SMTP id j14-20020a170902da8e00b001c0e87e52b9mr204011plx.12.1694656585587; Wed, 13 Sep 2023 18:56:25 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 13 Sep 2023 18:55:23 -0700 In-Reply-To: <20230914015531.1419405-1-seanjc@google.com> Mime-Version: 1.0 References: <20230914015531.1419405-1-seanjc@google.com> X-Mailer: git-send-email 2.42.0.283.g2d96d420d3-goog Message-ID: <20230914015531.1419405-26-seanjc@google.com> Subject: [RFC PATCH v12 25/33] KVM: selftests: Add helpers to convert guest memory b/w private and shared 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 , Anish Moorthy , Yu Zhang , Isaku Yamahata , Xu Yilun , 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: From: Vishal Annapurve Add helpers to convert memory between private and shared via KVM's memory attributes, as well as helpers to free/allocate guest_memfd memory via fallocate(). Userspace, i.e. tests, is NOT required to do fallocate() when converting memory, as the attributes are the single source of true. The fallocate() helpers are provided so that tests can mimic a userspace that frees private memory on conversion, e.g. to prioritize memory usage over performance. Signed-off-by: Vishal Annapurve Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson --- .../selftests/kvm/include/kvm_util_base.h | 48 +++++++++++++++++++ tools/testing/selftests/kvm/lib/kvm_util.c | 26 ++++++++++ 2 files changed, 74 insertions(+) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index 47ea25f9dc97..a0315503ac3e 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -333,6 +333,54 @@ static inline void vm_enable_cap(struct kvm_vm *vm, uint32_t cap, uint64_t arg0) vm_ioctl(vm, KVM_ENABLE_CAP, &enable_cap); } +static inline void vm_set_memory_attributes(struct kvm_vm *vm, uint64_t gpa, + uint64_t size, uint64_t attributes) +{ + struct kvm_memory_attributes attr = { + .attributes = attributes, + .address = gpa, + .size = size, + .flags = 0, + }; + + /* + * KVM_SET_MEMORY_ATTRIBUTES overwrites _all_ attributes. These flows + * need significant enhancements to support multiple attributes. + */ + TEST_ASSERT(!attributes || attributes == KVM_MEMORY_ATTRIBUTE_PRIVATE, + "Update me to support multiple attributes!"); + + vm_ioctl(vm, KVM_SET_MEMORY_ATTRIBUTES, &attr); +} + + +static inline void vm_mem_set_private(struct kvm_vm *vm, uint64_t gpa, + uint64_t size) +{ + vm_set_memory_attributes(vm, gpa, size, KVM_MEMORY_ATTRIBUTE_PRIVATE); +} + +static inline void vm_mem_set_shared(struct kvm_vm *vm, uint64_t gpa, + uint64_t size) +{ + vm_set_memory_attributes(vm, gpa, size, 0); +} + +void vm_guest_mem_fallocate(struct kvm_vm *vm, uint64_t gpa, uint64_t size, + bool punch_hole); + +static inline void vm_guest_mem_punch_hole(struct kvm_vm *vm, uint64_t gpa, + uint64_t size) +{ + vm_guest_mem_fallocate(vm, gpa, size, true); +} + +static inline void vm_guest_mem_allocate(struct kvm_vm *vm, uint64_t gpa, + uint64_t size) +{ + vm_guest_mem_fallocate(vm, gpa, size, false); +} + void vm_enable_dirty_ring(struct kvm_vm *vm, uint32_t ring_size); const char *vm_guest_mode_string(uint32_t i); diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 127f44c6c83c..bf2bd5c39a96 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -1176,6 +1176,32 @@ void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot) __vm_mem_region_delete(vm, memslot2region(vm, slot), true); } +void vm_guest_mem_fallocate(struct kvm_vm *vm, uint64_t gpa, uint64_t size, + bool punch_hole) +{ + struct userspace_mem_region *region; + uint64_t end = gpa + size - 1; + off_t fd_offset; + int mode, ret; + + region = userspace_mem_region_find(vm, gpa, gpa); + TEST_ASSERT(region && region->region.flags & KVM_MEM_PRIVATE, + "Private memory region not found for GPA 0x%lx", gpa); + + TEST_ASSERT(region == userspace_mem_region_find(vm, end, end), + "fallocate() for guest_memfd must act on a single memslot"); + + fd_offset = region->region.gmem_offset + + (gpa - region->region.guest_phys_addr); + + mode = FALLOC_FL_KEEP_SIZE | (punch_hole ? FALLOC_FL_PUNCH_HOLE : 0); + + ret = fallocate(region->region.gmem_fd, mode, fd_offset, size); + TEST_ASSERT(!ret, "fallocate() failed to %s at %lx[%lu], fd = %d, mode = %x, offset = %lx\n", + punch_hole ? "punch hole" : "allocate", gpa, size, + region->region.gmem_fd, mode, fd_offset); +} + /* Returns the size of a vCPU's kvm_run structure. */ static int vcpu_mmap_sz(void) {