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Mon, 07 Aug 2023 16:01:36 -0700 (PDT) Date: Mon, 7 Aug 2023 23:01:07 +0000 In-Reply-To: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.41.0.640.ga95def55d0-goog Message-ID: Subject: [RFC PATCH 04/11] KVM: selftests: Test transferring private memory to another VM From: Ackerley Tng To: 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 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, tabba@google.com, jarkko@kernel.org, yu.c.zhang@linux.intel.com, vannapurve@google.com, ackerleytng@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 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Signed-off-by: Ackerley Tng --- tools/testing/selftests/kvm/Makefile | 1 + .../kvm/x86_64/private_mem_migrate_tests.c | 87 +++++++++++++++++++ 2 files changed, 88 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/private_mem_migrate_tests.c diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index cb9450022302..d348ff56c92b 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -82,6 +82,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/platform_info_test TEST_GEN_PROGS_x86_64 += x86_64/pmu_event_filter_test TEST_GEN_PROGS_x86_64 += x86_64/private_mem_conversions_test TEST_GEN_PROGS_x86_64 += x86_64/private_mem_kvm_exits_test +TEST_GEN_PROGS_x86_64 += x86_64/private_mem_migrate_tests TEST_GEN_PROGS_x86_64 += x86_64/set_boot_cpu_id TEST_GEN_PROGS_x86_64 += x86_64/set_sregs_test TEST_GEN_PROGS_x86_64 += x86_64/smaller_maxphyaddr_emulation_test diff --git a/tools/testing/selftests/kvm/x86_64/private_mem_migrate_tests.c b/tools/testing/selftests/kvm/x86_64/private_mem_migrate_tests.c new file mode 100644 index 000000000000..4226de3ebd41 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/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; +}