| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2023, Google LLC. |
| */ |
| #include <linux/kvm.h> |
| #include <pthread.h> |
| #include <stdint.h> |
| |
| #include "kvm_util.h" |
| #include "processor.h" |
| #include "test_util.h" |
| |
| /* Arbitrarily selected to avoid overlaps with anything else */ |
| #define EXITS_TEST_GVA 0xc0000000 |
| #define EXITS_TEST_GPA EXITS_TEST_GVA |
| #define EXITS_TEST_NPAGES 1 |
| #define EXITS_TEST_SIZE (EXITS_TEST_NPAGES * PAGE_SIZE) |
| #define EXITS_TEST_SLOT 10 |
| |
| static uint64_t guest_repeatedly_read(void) |
| { |
| volatile uint64_t value; |
| |
| while (true) |
| value = *((uint64_t *) EXITS_TEST_GVA); |
| |
| return value; |
| } |
| |
| static uint32_t run_vcpu_get_exit_reason(struct kvm_vcpu *vcpu) |
| { |
| int r; |
| |
| r = _vcpu_run(vcpu); |
| if (r) { |
| TEST_ASSERT(errno == EFAULT, KVM_IOCTL_ERROR(KVM_RUN, r)); |
| TEST_ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_MEMORY_FAULT); |
| } |
| return vcpu->run->exit_reason; |
| } |
| |
| const struct vm_shape protected_vm_shape = { |
| .mode = VM_MODE_DEFAULT, |
| .type = KVM_X86_SW_PROTECTED_VM, |
| }; |
| |
| static void test_private_access_memslot_deleted(void) |
| { |
| struct kvm_vm *vm; |
| struct kvm_vcpu *vcpu; |
| pthread_t vm_thread; |
| void *thread_return; |
| uint32_t exit_reason; |
| |
| vm = vm_create_shape_with_one_vcpu(protected_vm_shape, &vcpu, |
| guest_repeatedly_read); |
| |
| vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, |
| EXITS_TEST_GPA, EXITS_TEST_SLOT, |
| EXITS_TEST_NPAGES, |
| KVM_MEM_GUEST_MEMFD); |
| |
| virt_map(vm, EXITS_TEST_GVA, EXITS_TEST_GPA, EXITS_TEST_NPAGES); |
| |
| /* Request to access page privately */ |
| vm_mem_set_private(vm, EXITS_TEST_GPA, EXITS_TEST_SIZE); |
| |
| pthread_create(&vm_thread, NULL, |
| (void *(*)(void *))run_vcpu_get_exit_reason, |
| (void *)vcpu); |
| |
| vm_mem_region_delete(vm, EXITS_TEST_SLOT); |
| |
| pthread_join(vm_thread, &thread_return); |
| exit_reason = (uint32_t)(uint64_t)thread_return; |
| |
| TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MEMORY_FAULT); |
| TEST_ASSERT_EQ(vcpu->run->memory_fault.flags, KVM_MEMORY_EXIT_FLAG_PRIVATE); |
| TEST_ASSERT_EQ(vcpu->run->memory_fault.gpa, EXITS_TEST_GPA); |
| TEST_ASSERT_EQ(vcpu->run->memory_fault.size, EXITS_TEST_SIZE); |
| |
| kvm_vm_free(vm); |
| } |
| |
| static void test_private_access_memslot_not_private(void) |
| { |
| struct kvm_vm *vm; |
| struct kvm_vcpu *vcpu; |
| uint32_t exit_reason; |
| |
| vm = vm_create_shape_with_one_vcpu(protected_vm_shape, &vcpu, |
| guest_repeatedly_read); |
| |
| /* Add a non-private memslot (flags = 0) */ |
| vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, |
| EXITS_TEST_GPA, EXITS_TEST_SLOT, |
| EXITS_TEST_NPAGES, 0); |
| |
| virt_map(vm, EXITS_TEST_GVA, EXITS_TEST_GPA, EXITS_TEST_NPAGES); |
| |
| /* Request to access page privately */ |
| vm_mem_set_private(vm, EXITS_TEST_GPA, EXITS_TEST_SIZE); |
| |
| exit_reason = run_vcpu_get_exit_reason(vcpu); |
| |
| TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MEMORY_FAULT); |
| TEST_ASSERT_EQ(vcpu->run->memory_fault.flags, KVM_MEMORY_EXIT_FLAG_PRIVATE); |
| TEST_ASSERT_EQ(vcpu->run->memory_fault.gpa, EXITS_TEST_GPA); |
| TEST_ASSERT_EQ(vcpu->run->memory_fault.size, EXITS_TEST_SIZE); |
| |
| kvm_vm_free(vm); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM)); |
| |
| test_private_access_memslot_deleted(); |
| test_private_access_memslot_not_private(); |
| } |