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AJvYcCUWi8D4dI8B0AhsL3zA4enz7bvUmBuh4Qx3x4r1oGTwpLtOw8PMfUT3QfYImYm337/AI5hpUOpbgpnGgrts0/E=@vger.kernel.org X-Gm-Message-State: AOJu0YzjTSDt8mtU9tQXlPfGpDYZhpqjYpsfa94OcMz+/0ghGEveT7DB E8gQJaw5XqXmTSoO58YMaCeQ07HvBRNu6iFx56lZcjCgNHWk+495Ia6aBvt3OKAVk126p3V49oz hArtPF2Tnxg== X-Google-Smtp-Source: AGHT+IHsBpALK/e0rg+JB1mNGETo/0o1fwTI4vHuGOsLELeZyBF3WgvYCnwYUD0i5CByXpXpO2KcQaRcAv/0 X-Received: from pjbqn6.prod.google.com ([2002:a17:90b:3d46:b0:2fc:ccfe:368]) (user=afranji job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90a:e185:b0:2ff:6ac2:c5a5 with SMTP id 98e67ed59e1d1-30e7d5a8600mr5955317a91.26.1747423197397; Fri, 16 May 2025 12:19:57 -0700 (PDT) Date: Fri, 16 May 2025 19:19:26 +0000 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.49.0.1101.gccaa498523-goog Message-ID: Subject: [RFC PATCH v2 06/13] KVM: selftests: Test transferring private memory to another VM From: Ryan Afranji To: afranji@google.com, ackerleytng@google.com, pbonzini@redhat.com, seanjc@google.com, tglx@linutronix.de, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, tabba@google.com Cc: mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, shuah@kernel.org, andrew.jones@linux.dev, ricarkol@google.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, yu.c.zhang@linux.intel.com, vannapurve@google.com, erdemaktas@google.com, mail@maciej.szmigiero.name, vbabka@suse.cz, david@redhat.com, qperret@google.com, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, sagis@google.com, jthoughton@google.com From: Ackerley Tng Signed-off-by: Ackerley Tng Signed-off-by: Ryan Afranji --- .../kvm/x86/private_mem_migrate_tests.c | 87 +++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86/private_mem_migrate_tests.c diff --git a/tools/testing/selftests/kvm/x86/private_mem_migrate_tests.c b/tools/testing/selftests/kvm/x86/private_mem_migrate_tests.c new file mode 100644 index 000000000000..4226de3ebd41 --- /dev/null +++ b/tools/testing/selftests/kvm/x86/private_mem_migrate_tests.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "kvm_util_base.h" +#include "test_util.h" +#include "ucall_common.h" +#include +#include + +#define TRANSFER_PRIVATE_MEM_TEST_SLOT 10 +#define TRANSFER_PRIVATE_MEM_GPA ((uint64_t)(1ull << 32)) +#define TRANSFER_PRIVATE_MEM_GVA TRANSFER_PRIVATE_MEM_GPA +#define TRANSFER_PRIVATE_MEM_VALUE 0xdeadbeef + +static void transfer_private_mem_guest_code_src(void) +{ + uint64_t volatile *const ptr = (uint64_t *)TRANSFER_PRIVATE_MEM_GVA; + + *ptr = TRANSFER_PRIVATE_MEM_VALUE; + + GUEST_SYNC1(*ptr); +} + +static void transfer_private_mem_guest_code_dst(void) +{ + uint64_t volatile *const ptr = (uint64_t *)TRANSFER_PRIVATE_MEM_GVA; + + GUEST_SYNC1(*ptr); +} + +static void test_transfer_private_mem(void) +{ + struct kvm_vm *src_vm, *dst_vm; + struct kvm_vcpu *src_vcpu, *dst_vcpu; + int src_memfd, dst_memfd; + struct ucall uc; + + const struct vm_shape shape = { + .mode = VM_MODE_DEFAULT, + .type = KVM_X86_SW_PROTECTED_VM, + }; + + /* Build the source VM, use it to write to private memory */ + src_vm = __vm_create_shape_with_one_vcpu( + shape, &src_vcpu, 0, transfer_private_mem_guest_code_src); + src_memfd = vm_create_guest_memfd(src_vm, SZ_4K, 0); + + vm_mem_add(src_vm, DEFAULT_VM_MEM_SRC, TRANSFER_PRIVATE_MEM_GPA, + TRANSFER_PRIVATE_MEM_TEST_SLOT, 1, KVM_MEM_PRIVATE, + src_memfd, 0); + + virt_map(src_vm, TRANSFER_PRIVATE_MEM_GVA, TRANSFER_PRIVATE_MEM_GPA, 1); + vm_set_memory_attributes(src_vm, TRANSFER_PRIVATE_MEM_GPA, SZ_4K, + KVM_MEMORY_ATTRIBUTE_PRIVATE); + + vcpu_run(src_vcpu); + TEST_ASSERT_KVM_EXIT_REASON(src_vcpu, KVM_EXIT_IO); + get_ucall(src_vcpu, &uc); + TEST_ASSERT(uc.args[0] == TRANSFER_PRIVATE_MEM_VALUE, + "Source VM should be able to write to private memory"); + + /* Build the destination VM with linked fd */ + dst_vm = __vm_create_shape_with_one_vcpu( + shape, &dst_vcpu, 0, transfer_private_mem_guest_code_dst); + dst_memfd = vm_link_guest_memfd(dst_vm, src_memfd, 0); + + vm_mem_add(dst_vm, DEFAULT_VM_MEM_SRC, TRANSFER_PRIVATE_MEM_GPA, + TRANSFER_PRIVATE_MEM_TEST_SLOT, 1, KVM_MEM_PRIVATE, + dst_memfd, 0); + + virt_map(dst_vm, TRANSFER_PRIVATE_MEM_GVA, TRANSFER_PRIVATE_MEM_GPA, 1); + vm_set_memory_attributes(dst_vm, TRANSFER_PRIVATE_MEM_GPA, SZ_4K, + KVM_MEMORY_ATTRIBUTE_PRIVATE); + + vcpu_run(dst_vcpu); + TEST_ASSERT_KVM_EXIT_REASON(dst_vcpu, KVM_EXIT_IO); + get_ucall(dst_vcpu, &uc); + TEST_ASSERT(uc.args[0] == TRANSFER_PRIVATE_MEM_VALUE, + "Destination VM should be able to read value transferred"); +} + +int main(int argc, char *argv[]) +{ + TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM)); + + test_transfer_private_mem(); + + return 0; +}