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Wed, 15 Mar 2023 17:31:30 -0700 (PDT) Date: Thu, 16 Mar 2023 00:31:02 +0000 In-Reply-To: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.40.0.rc2.332.ga46443480c-goog Message-ID: Subject: [RFC PATCH 09/10] KVM: selftests: Add tests around sharing a restrictedmem fd From: Ackerley Tng To: kvm@vger.kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org Cc: aarcange@redhat.com, ak@linux.intel.com, akpm@linux-foundation.org, arnd@arndb.de, bfields@fieldses.org, bp@alien8.de, chao.p.peng@linux.intel.com, corbet@lwn.net, dave.hansen@intel.com, david@redhat.com, ddutile@redhat.com, dhildenb@redhat.com, hpa@zytor.com, hughd@google.com, jlayton@kernel.org, jmattson@google.com, joro@8bytes.org, jun.nakajima@intel.com, kirill.shutemov@linux.intel.com, linmiaohe@huawei.com, luto@kernel.org, mail@maciej.szmigiero.name, mhocko@suse.com, michael.roth@amd.com, mingo@redhat.com, naoya.horiguchi@nec.com, pbonzini@redhat.com, qperret@google.com, rppt@kernel.org, seanjc@google.com, shuah@kernel.org, steven.price@arm.com, tabba@google.com, tglx@linutronix.de, vannapurve@google.com, vbabka@suse.cz, vkuznets@redhat.com, wanpengli@tencent.com, wei.w.wang@intel.com, x86@kernel.org, yu.c.zhang@linux.intel.com, Ackerley Tng Received-SPF: pass client-ip=2607:f8b0:4864:20::64a; envelope-from=3YmMSZAsKCpk35D7KE7RMG99HH9E7.5HFJ7FN-67O7EGHG9GN.HK9@flex--ackerleytng.bounces.google.com; helo=mail-pl1-x64a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Tests that + Different memslots in the same VM should be able to share a restrictedmem_fd + A second VM cannot share the same offsets in a restrictedmem_fd + Different VMs should be able to share the same restrictedmem_fd, as long as the offsets in the restrictedmem_fd are different Signed-off-by: Ackerley Tng --- .../selftests/kvm/set_memory_region_test.c | 29 +++++++++++++++++-- 1 file changed, 26 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/kvm/set_memory_region_test.c b/tools/testing/selftests/kvm/set_memory_region_test.c index cc727d11569e..789c413e2a67 100644 --- a/tools/testing/selftests/kvm/set_memory_region_test.c +++ b/tools/testing/selftests/kvm/set_memory_region_test.c @@ -401,7 +401,7 @@ static bool set_private_region_failed(struct kvm_vm *vm, void *hva, static void test_private_regions(void) { int ret; - struct kvm_vm *vm; + struct kvm_vm *vm, *vm2; void *mem; int fd; @@ -416,7 +416,7 @@ static void test_private_regions(void) vm = __vm_create(shape, 1, 0); - mem = mmap(NULL, MEM_REGION_SIZE * 2, PROT_READ | PROT_WRITE, + mem = mmap(NULL, MEM_REGION_SIZE * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0); TEST_ASSERT(mem != MAP_FAILED, "Failed to mmap() host"); @@ -448,8 +448,31 @@ static void test_private_regions(void) TEST_ASSERT(ret == -1 && errno == EINVAL, "Set overlapping restrictedmem_offset should fail"); - munmap(mem, MEM_REGION_SIZE * 2); + ret = __vm_set_user_memory_region2(vm, MEM_REGION_SLOT + 1, + KVM_MEM_PRIVATE, + MEM_REGION_GPA + MEM_REGION_SIZE, + MEM_REGION_SIZE, + mem + MEM_REGION_SIZE, + fd, MEM_REGION_SIZE); + TEST_ASSERT(!ret, + "Different memslots should be able to share a restrictedmem_fd"); + + vm2 = __vm_create(shape, 1, 0); + TEST_ASSERT(set_private_region_failed(vm2, mem + 2 * MEM_REGION_SIZE, fd, 0), + "Pages (offsets) of a restrictedmem_fd should be exclusive to a VM"); + + ret = __vm_set_user_memory_region2(vm2, MEM_REGION_SLOT, + KVM_MEM_PRIVATE, + MEM_REGION_GPA + 2 * MEM_REGION_SIZE, + MEM_REGION_SIZE, + mem + 2 * MEM_REGION_SIZE, + fd, 2 * MEM_REGION_SIZE); + TEST_ASSERT(!ret, + "Different VMs should be able to share a restrictedmem_fd"); + + munmap(mem, MEM_REGION_SIZE * 3); kvm_vm_free(vm); + kvm_vm_free(vm2); } int main(int argc, char *argv[])