1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2020, Google LLC.
8 #include "perf_test_util.h"
11 struct perf_test_args perf_test_args;
13 uint64_t guest_test_phys_mem;
16 * Guest virtual memory offset of the testing memory slot.
17 * Must not conflict with identity mapped test code.
19 static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM;
22 * Continuously write to the first 8 bytes of each page in the
25 static void guest_code(uint32_t vcpu_id)
27 struct perf_test_vcpu_args *vcpu_args = &perf_test_args.vcpu_args[vcpu_id];
32 /* Make sure vCPU args data structure is not corrupt. */
33 GUEST_ASSERT(vcpu_args->vcpu_id == vcpu_id);
36 pages = vcpu_args->pages;
39 for (i = 0; i < pages; i++) {
40 uint64_t addr = gva + (i * perf_test_args.guest_page_size);
42 if (i % perf_test_args.wr_fract == 0)
43 *(uint64_t *)addr = 0x0123456789ABCDEF;
45 READ_ONCE(*(uint64_t *)addr);
52 struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
53 uint64_t vcpu_memory_bytes,
54 enum vm_mem_backing_src_type backing_src)
57 uint64_t guest_num_pages;
59 pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode));
61 perf_test_args.host_page_size = getpagesize();
62 perf_test_args.guest_page_size = vm_guest_mode_params[mode].page_size;
64 guest_num_pages = vm_adjust_num_guest_pages(mode,
65 (vcpus * vcpu_memory_bytes) / perf_test_args.guest_page_size);
67 TEST_ASSERT(vcpu_memory_bytes % perf_test_args.host_page_size == 0,
68 "Guest memory size is not host page size aligned.");
69 TEST_ASSERT(vcpu_memory_bytes % perf_test_args.guest_page_size == 0,
70 "Guest memory size is not guest page size aligned.");
72 vm = vm_create_with_vcpus(mode, vcpus, DEFAULT_GUEST_PHY_PAGES,
73 (vcpus * vcpu_memory_bytes) / perf_test_args.guest_page_size,
76 perf_test_args.vm = vm;
79 * If there should be more memory in the guest test region than there
80 * can be pages in the guest, it will definitely cause problems.
82 TEST_ASSERT(guest_num_pages < vm_get_max_gfn(vm),
83 "Requested more guest memory than address space allows.\n"
84 " guest pages: %" PRIx64 " max gfn: %" PRIx64
85 " vcpus: %d wss: %" PRIx64 "]\n",
86 guest_num_pages, vm_get_max_gfn(vm), vcpus,
89 guest_test_phys_mem = (vm_get_max_gfn(vm) - guest_num_pages) *
90 perf_test_args.guest_page_size;
91 guest_test_phys_mem &= ~(perf_test_args.host_page_size - 1);
93 /* Align to 1M (segment size) */
94 guest_test_phys_mem &= ~((1 << 20) - 1);
96 pr_info("guest physical test memory offset: 0x%lx\n", guest_test_phys_mem);
98 /* Add an extra memory slot for testing */
99 vm_userspace_mem_region_add(vm, backing_src, guest_test_phys_mem,
100 PERF_TEST_MEM_SLOT_INDEX,
103 /* Do mapping for the demand paging memory slot */
104 virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, guest_num_pages, 0);
106 ucall_init(vm, NULL);
111 void perf_test_destroy_vm(struct kvm_vm *vm)
117 void perf_test_setup_vcpus(struct kvm_vm *vm, int vcpus,
118 uint64_t vcpu_memory_bytes,
119 bool partition_vcpu_memory_access)
122 struct perf_test_vcpu_args *vcpu_args;
125 for (vcpu_id = 0; vcpu_id < vcpus; vcpu_id++) {
126 vcpu_args = &perf_test_args.vcpu_args[vcpu_id];
128 vcpu_args->vcpu_id = vcpu_id;
129 if (partition_vcpu_memory_access) {
130 vcpu_args->gva = guest_test_virt_mem +
131 (vcpu_id * vcpu_memory_bytes);
132 vcpu_args->pages = vcpu_memory_bytes /
133 perf_test_args.guest_page_size;
134 vcpu_gpa = guest_test_phys_mem +
135 (vcpu_id * vcpu_memory_bytes);
137 vcpu_args->gva = guest_test_virt_mem;
138 vcpu_args->pages = (vcpus * vcpu_memory_bytes) /
139 perf_test_args.guest_page_size;
140 vcpu_gpa = guest_test_phys_mem;
143 pr_debug("Added VCPU %d with test mem gpa [%lx, %lx)\n",
144 vcpu_id, vcpu_gpa, vcpu_gpa +
145 (vcpu_args->pages * perf_test_args.guest_page_size));