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AJvYcCWrLm6Ts22P7SowSn3EOGoCaAAY3ixkr1Y5tDWW1mLzsoR2HFeeR+2lBk2JHGKTeu5nQMBYxyUFEw==@kvack.org X-Gm-Message-State: AOJu0YzcIAs6scXK9a7wrxx4hRnBdg9ckxMeW+UxUA1tap9oGc9iAh79 ozgDwQGcMQW9O18FvQl7DuXZydZL0rK49Qp1c2AU7MXLp+hZAHW5qTe94bgFH4vs/1EkBKQHG94 bsg== X-Google-Smtp-Source: AGHT+IFBYUZUFsotJ/ALlX7SFME5SB4zZrP3dCOPXg8atTxWSpA8lzYqkotyLIZ4ig+DWvvLrUuGV72AYA== X-Received: from wmsd11.prod.google.com ([2002:a05:600c:3acb:b0:453:86cc:7393]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:6304:b0:450:d01f:de6f with SMTP id 5b1f17b1804b1-454ec2639bdmr156088905e9.15.1752572078008; Tue, 15 Jul 2025 02:34:38 -0700 (PDT) Date: Tue, 15 Jul 2025 10:33:50 +0100 In-Reply-To: <20250715093350.2584932-1-tabba@google.com> Mime-Version: 1.0 References: <20250715093350.2584932-1-tabba@google.com> X-Mailer: git-send-email 2.50.0.727.gbf7dc18ff4-goog Message-ID: <20250715093350.2584932-22-tabba@google.com> Subject: [PATCH v14 21/21] KVM: selftests: guest_memfd mmap() test when mmap is supported From: Fuad Tabba To: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, kvmarm@lists.linux.dev Cc: pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, david@redhat.com, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com, tabba@google.com Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: 81r7mesirmatagkj7ewzjh961zsw6izc X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 7BC9440006 X-Rspam-User: X-HE-Tag: 1752572079-456408 X-HE-Meta: U2FsdGVkX18jgQVji6fWBTTu4czfLcyAA3xgv5doTVPMh7TTxjJi+rI46emyWENHtRr3cnZBx6pFNl9vdtYr3xebu9TE8XSHxfeOKJAiZMJDsTxLu32Xg4XXq/WRywVAQcB+42E72VoKaSa+9A2/6tBMGS1QOtkAVfDM3O3uJ+pLR8rNvyn41iojyQPaV1e1ZuGysmkql/t85Pq7eloQ0qo0q0lP/ztDlpws2J24seHRW3f0PpExv45N4k22hsHzQDcx0ZPt3cCgcXISbm9dNXKv+aZ8IYxcITBkggEe459D6JEAJN6RCMzc1TqEDN6RDfB2JPiweGUENCOZpIrr95Mdlo3MaCXgAF8anTmgnbsbVFSoav1J7ZzmfHH5/MDgs3edtKUZBTNXWBa1gnfOcuRA39qzhoVlJxwAKk5H1Nl5FKlA4Y42skWJIv94AlH5kP1tLhC09rAGkisftxp+a7D3+YNwGkttfAGUm+nnCWnffHhr4ZX8x3L5y2I37B6lV0i2vwd37QZgvbdBOKJ/x3pi8iN8RCMzXGZYjP7Us/5RQ8yB6pC9cEeBZxf7HI+1zaKvY0aSVKWBkefxeXozDiJIk5uDP8SdL6AO1gQeCrrlrA44ewr2LHwtBJC1B6yhhwLvu8lCRKPTjicYh4nK4qOqtP4gJzWyHqYf8kwEUm7pzsqE+q9pbsmmzryMB2bwLwV4MzhYIm2qU5TJxYlObaPcO04j3XzkqrXac2zd3cLW/XrfRLu/iBseMNcVrRFvK/2hK6StyN/IhFtWlPUzbkm6iEshSE+q1Dy/6C8X9W+wfpvmKuMnPB7LFAW+6I6z7dxmK+fS/OHfja8qkm4HLAJwynsn0E+FvkBCtAS0he48fOmwJPOd2qAINJCed/wziNqG1A3fHnZ1MyUBtVVxr7Q3G+e3PKjZoTMMYEML0siOLCpz7rEWFFSIZf/E8oIZN5WTa9oyUUSbN8MpnBT hKPfNQyX 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Expand the guest_memfd selftests to comprehensively test host userspace mmap functionality for guest_memfd-backed memory when supported by the VM type. Introduce new test cases to verify the following: * Successful mmap operations: Ensure that MAP_SHARED mappings succeed when guest_memfd mmap is enabled. * Data integrity: Validate that data written to the mmap'd region is correctly persistent and readable. * fallocate interaction: Test that fallocate(FALLOC_FL_PUNCH_HOLE) correctly zeros out mapped pages. * Out-of-bounds access: Verify that accessing memory beyond the guest_memfd's size correctly triggers a SIGBUS signal. * Unsupported mmap: Confirm that mmap attempts fail as expected when guest_memfd mmap support is not enabled for the specific guest_memfd instance or VM type. * Flag validity: Introduce test_vm_type_gmem_flag_validity() to systematically test that only allowed guest_memfd creation flags are accepted for different VM types (e.g., GUEST_MEMFD_FLAG_MMAP for default VMs, no flags for CoCo VMs). The existing tests for guest_memfd creation (multiple instances, invalid sizes), file read/write, file size, and invalid punch hole operations are integrated into the new test_with_type() framework to allow testing across different VM types. Reviewed-by: James Houghton Reviewed-by: Gavin Shan Reviewed-by: Shivank Garg Co-developed-by: Ackerley Tng Signed-off-by: Ackerley Tng Signed-off-by: Fuad Tabba --- .../testing/selftests/kvm/guest_memfd_test.c | 197 ++++++++++++++++-- 1 file changed, 176 insertions(+), 21 deletions(-) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 341ba616cf55..1252e74fbb8f 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -13,6 +13,8 @@ #include #include +#include +#include #include #include #include @@ -34,12 +36,83 @@ static void test_file_read_write(int fd) "pwrite on a guest_mem fd should fail"); } -static void test_mmap(int fd, size_t page_size) +static void test_mmap_supported(int fd, size_t page_size, size_t total_size) +{ + const char val = 0xaa; + char *mem; + size_t i; + int ret; + + mem = mmap(NULL, total_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); + TEST_ASSERT(mem == MAP_FAILED, "Copy-on-write not allowed by guest_memfd."); + + mem = mmap(NULL, total_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + TEST_ASSERT(mem != MAP_FAILED, "mmap() for guest_memfd should succeed."); + + memset(mem, val, total_size); + for (i = 0; i < total_size; i++) + TEST_ASSERT_EQ(READ_ONCE(mem[i]), val); + + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, + page_size); + TEST_ASSERT(!ret, "fallocate the first page should succeed."); + + for (i = 0; i < page_size; i++) + TEST_ASSERT_EQ(READ_ONCE(mem[i]), 0x00); + for (; i < total_size; i++) + TEST_ASSERT_EQ(READ_ONCE(mem[i]), val); + + memset(mem, val, page_size); + for (i = 0; i < total_size; i++) + TEST_ASSERT_EQ(READ_ONCE(mem[i]), val); + + ret = munmap(mem, total_size); + TEST_ASSERT(!ret, "munmap() should succeed."); +} + +static sigjmp_buf jmpbuf; +void fault_sigbus_handler(int signum) +{ + siglongjmp(jmpbuf, 1); +} + +static void test_fault_overflow(int fd, size_t page_size, size_t total_size) +{ + struct sigaction sa_old, sa_new = { + .sa_handler = fault_sigbus_handler, + }; + size_t map_size = total_size * 4; + const char val = 0xaa; + char *mem; + size_t i; + int ret; + + mem = mmap(NULL, map_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + TEST_ASSERT(mem != MAP_FAILED, "mmap() for guest_memfd should succeed."); + + sigaction(SIGBUS, &sa_new, &sa_old); + if (sigsetjmp(jmpbuf, 1) == 0) { + memset(mem, 0xaa, map_size); + TEST_ASSERT(false, "memset() should have triggered SIGBUS."); + } + sigaction(SIGBUS, &sa_old, NULL); + + for (i = 0; i < total_size; i++) + TEST_ASSERT_EQ(READ_ONCE(mem[i]), val); + + ret = munmap(mem, map_size); + TEST_ASSERT(!ret, "munmap() should succeed."); +} + +static void test_mmap_not_supported(int fd, size_t page_size, size_t total_size) { char *mem; mem = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); TEST_ASSERT_EQ(mem, MAP_FAILED); + + mem = mmap(NULL, total_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + TEST_ASSERT_EQ(mem, MAP_FAILED); } static void test_file_size(int fd, size_t page_size, size_t total_size) @@ -120,26 +193,19 @@ static void test_invalid_punch_hole(int fd, size_t page_size, size_t total_size) } } -static void test_create_guest_memfd_invalid(struct kvm_vm *vm) +static void test_create_guest_memfd_invalid_sizes(struct kvm_vm *vm, + uint64_t guest_memfd_flags, + size_t page_size) { - size_t page_size = getpagesize(); - uint64_t flag; size_t size; int fd; for (size = 1; size < page_size; size++) { - fd = __vm_create_guest_memfd(vm, size, 0); - TEST_ASSERT(fd == -1 && errno == EINVAL, + fd = __vm_create_guest_memfd(vm, size, guest_memfd_flags); + TEST_ASSERT(fd < 0 && errno == EINVAL, "guest_memfd() with non-page-aligned page size '0x%lx' should fail with EINVAL", size); } - - for (flag = BIT(0); flag; flag <<= 1) { - fd = __vm_create_guest_memfd(vm, page_size, flag); - TEST_ASSERT(fd == -1 && errno == EINVAL, - "guest_memfd() with flag '0x%lx' should fail with EINVAL", - flag); - } } static void test_create_guest_memfd_multiple(struct kvm_vm *vm) @@ -171,30 +237,119 @@ static void test_create_guest_memfd_multiple(struct kvm_vm *vm) close(fd1); } -int main(int argc, char *argv[]) +static bool check_vm_type(unsigned long vm_type) { - size_t page_size; + /* + * Not all architectures support KVM_CAP_VM_TYPES. However, those that + * support guest_memfd have that support for the default VM type. + */ + if (vm_type == VM_TYPE_DEFAULT) + return true; + + return kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(vm_type); +} + +static void test_with_type(unsigned long vm_type, uint64_t guest_memfd_flags, + bool expect_mmap_allowed) +{ + struct kvm_vm *vm; size_t total_size; + size_t page_size; int fd; - struct kvm_vm *vm; - TEST_REQUIRE(kvm_has_cap(KVM_CAP_GUEST_MEMFD)); + if (!check_vm_type(vm_type)) + return; page_size = getpagesize(); total_size = page_size * 4; - vm = vm_create_barebones(); + vm = vm_create_barebones_type(vm_type); - test_create_guest_memfd_invalid(vm); test_create_guest_memfd_multiple(vm); + test_create_guest_memfd_invalid_sizes(vm, guest_memfd_flags, page_size); - fd = vm_create_guest_memfd(vm, total_size, 0); + fd = vm_create_guest_memfd(vm, total_size, guest_memfd_flags); test_file_read_write(fd); - test_mmap(fd, page_size); + + if (expect_mmap_allowed) { + test_mmap_supported(fd, page_size, total_size); + test_fault_overflow(fd, page_size, total_size); + + } else { + test_mmap_not_supported(fd, page_size, total_size); + } + test_file_size(fd, page_size, total_size); test_fallocate(fd, page_size, total_size); test_invalid_punch_hole(fd, page_size, total_size); close(fd); + kvm_vm_free(vm); +} + +static void test_vm_type_gmem_flag_validity(unsigned long vm_type, + uint64_t expected_valid_flags) +{ + size_t page_size = getpagesize(); + struct kvm_vm *vm; + uint64_t flag = 0; + int fd; + + if (!check_vm_type(vm_type)) + return; + + vm = vm_create_barebones_type(vm_type); + + for (flag = BIT(0); flag; flag <<= 1) { + fd = __vm_create_guest_memfd(vm, page_size, flag); + + if (flag & expected_valid_flags) { + TEST_ASSERT(fd >= 0, + "guest_memfd() with flag '0x%lx' should be valid", + flag); + close(fd); + } else { + TEST_ASSERT(fd < 0 && errno == EINVAL, + "guest_memfd() with flag '0x%lx' should fail with EINVAL", + flag); + } + } + + kvm_vm_free(vm); +} + +static void test_gmem_flag_validity(void) +{ + uint64_t non_coco_vm_valid_flags = 0; + + if (kvm_has_cap(KVM_CAP_GMEM_MMAP)) + non_coco_vm_valid_flags = GUEST_MEMFD_FLAG_MMAP; + + test_vm_type_gmem_flag_validity(VM_TYPE_DEFAULT, non_coco_vm_valid_flags); + +#ifdef __x86_64__ + test_vm_type_gmem_flag_validity(KVM_X86_SW_PROTECTED_VM, 0); + test_vm_type_gmem_flag_validity(KVM_X86_SEV_VM, 0); + test_vm_type_gmem_flag_validity(KVM_X86_SEV_ES_VM, 0); + test_vm_type_gmem_flag_validity(KVM_X86_SNP_VM, 0); + test_vm_type_gmem_flag_validity(KVM_X86_TDX_VM, 0); +#endif +} + +int main(int argc, char *argv[]) +{ + TEST_REQUIRE(kvm_has_cap(KVM_CAP_GUEST_MEMFD)); + + test_gmem_flag_validity(); + + test_with_type(VM_TYPE_DEFAULT, 0, false); + if (kvm_has_cap(KVM_CAP_GMEM_MMAP)) { + test_with_type(VM_TYPE_DEFAULT, GUEST_MEMFD_FLAG_MMAP, + true); + } + +#ifdef __x86_64__ + test_with_type(KVM_X86_SW_PROTECTED_VM, 0, false); +#endif } -- 2.50.0.727.gbf7dc18ff4-goog