From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 92EDE3DFE1 for ; Fri, 27 Oct 2023 18:25:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ix2AfYCW" Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 62E9B2108 for ; Fri, 27 Oct 2023 11:23:20 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-da0c7d27fb0so1329291276.1 for ; Fri, 27 Oct 2023 11:23:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1698430999; x=1699035799; 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=yVf4MoQ+pgFottQ0gtqF7KbCgtXqLOOMhwiDUmO9tI4=; b=ix2AfYCWSzN1bdrxAyi33qRQjavKq8nwxMaDU/CcG6wuKgr26X0rQ/n7Usbs7Yrcjv 91LiFtwyTgtf2pULZvgfUXMThlZ/iLcuFO3638AIAfsbWk+aB/4oMh6nTuwIPNDHHkIV 9NUGpbBinutdf56VN+QLFIB+4Fh5aJdMZMr+71f58+uUYpoOoswcf/ie0M3wWngBYg6q yQPehE4QQvg3j51xWAuOX1arWwnVJ4X4SjPvjMmW7o3mCGfkU/dCKO0TlAqA48qSpI87 v2IbiNbknEBaZT/zITeqa8+7sjHtIEoXeGLxhwcqU6DYC5PCUwy9VZqpfKAh4PO4gEHt c7Lw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698430999; x=1699035799; 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=yVf4MoQ+pgFottQ0gtqF7KbCgtXqLOOMhwiDUmO9tI4=; b=ktEeI7+pT4LHha1j2Gj1JkHlxCY4ezzm2XY4xxClQfcVFACjrom2rvD12Bk7Qdg68K jM7JJPfnhvXj10gjmWZZQSmYUKUee+Fhl4/fsLcFIms4OzaYRDHyFYy+hbmeD2L8ZHc8 NgOumbX9E9z5b/neF+4JewozjXoMdpNLlHKkfzTn8i88wetww1eTckvDmMi4nb6YBlC3 OhMZT24AsUuwhSdbYwaYqZBg+hAyGMQTlhTJ4wmHMcak5026i5fd5a98ZjEuMIamYytu 0WL9W3P72A7D4P3aYXsms1/EiGMZv1hzFlqckQOYOwL/NxhOa7gq2PrJLV+oMthwDVVD yQJg== X-Gm-Message-State: AOJu0YwvsiZ8r5O12skXZ/qxaCHF9ZVRW3gix2IknH77XI9BQmXkiTuF bvm2t50XCg1h7Jf6XaX3Sorf8uQF7ZE= X-Google-Smtp-Source: AGHT+IG9XwjMpXerybQ74hZWKPyWlQIkLL60UP7vz/JRGdDaUmVGZC9suFSomOjVdAtgwjkxyK2jTqS148U= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a25:2fce:0:b0:d9a:f3dc:7d19 with SMTP id v197-20020a252fce000000b00d9af3dc7d19mr60503ybv.11.1698430998960; Fri, 27 Oct 2023 11:23:18 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 27 Oct 2023 11:22:09 -0700 In-Reply-To: <20231027182217.3615211-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20231027182217.3615211-1-seanjc@google.com> X-Mailer: git-send-email 2.42.0.820.g83a721a137-goog Message-ID: <20231027182217.3615211-28-seanjc@google.com> Subject: [PATCH v13 27/35] 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 , 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=20Sala=C3=BCn?=" , Vlastimil Babka , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" Content-Type: text/plain; charset="UTF-8" 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. Provide allocate() helpers 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 | 28 +++++++++++ 2 files changed, 76 insertions(+) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index 9f861182c02a..1441fca6c273 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 45050f54701a..a140aee8d0f5 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -1176,6 +1176,34 @@ 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 base, uint64_t size, + bool punch_hole) +{ + const int mode = FALLOC_FL_KEEP_SIZE | (punch_hole ? FALLOC_FL_PUNCH_HOLE : 0); + struct userspace_mem_region *region; + uint64_t end = base + size; + uint64_t gpa, len; + off_t fd_offset; + int ret; + + for (gpa = base; gpa < end; gpa += len) { + uint64_t offset; + + 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); + + offset = (gpa - region->region.guest_phys_addr); + fd_offset = region->region.guest_memfd_offset + offset; + len = min_t(uint64_t, end - gpa, region->region.memory_size - offset); + + ret = fallocate(region->region.guest_memfd, mode, fd_offset, len); + TEST_ASSERT(!ret, "fallocate() failed to %s at %lx (len = %lu), fd = %d, mode = %x, offset = %lx\n", + punch_hole ? "punch hole" : "allocate", gpa, len, + region->region.guest_memfd, mode, fd_offset); + } +} + /* Returns the size of a vCPU's kvm_run structure. */ static int vcpu_mmap_sz(void) { -- 2.42.0.820.g83a721a137-goog