diff options
Diffstat (limited to 'tools/testing/selftests/kvm/lib/perf_test_util.c')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/perf_test_util.c | 322 |
1 files changed, 0 insertions, 322 deletions
diff --git a/tools/testing/selftests/kvm/lib/perf_test_util.c b/tools/testing/selftests/kvm/lib/perf_test_util.c deleted file mode 100644 index 3a9a3ea01a97..000000000000 --- a/tools/testing/selftests/kvm/lib/perf_test_util.c +++ /dev/null @@ -1,322 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2020, Google LLC. - */ -#define _GNU_SOURCE - -#include <inttypes.h> - -#include "kvm_util.h" -#include "perf_test_util.h" -#include "processor.h" - -struct perf_test_args perf_test_args; - -/* - * Guest virtual memory offset of the testing memory slot. - * Must not conflict with identity mapped test code. - */ -static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM; - -struct vcpu_thread { - /* The index of the vCPU. */ - int vcpu_idx; - - /* The pthread backing the vCPU. */ - pthread_t thread; - - /* Set to true once the vCPU thread is up and running. */ - bool running; -}; - -/* The vCPU threads involved in this test. */ -static struct vcpu_thread vcpu_threads[KVM_MAX_VCPUS]; - -/* The function run by each vCPU thread, as provided by the test. */ -static void (*vcpu_thread_fn)(struct perf_test_vcpu_args *); - -/* Set to true once all vCPU threads are up and running. */ -static bool all_vcpu_threads_running; - -static struct kvm_vcpu *vcpus[KVM_MAX_VCPUS]; - -/* - * Continuously write to the first 8 bytes of each page in the - * specified region. - */ -void perf_test_guest_code(uint32_t vcpu_idx) -{ - struct perf_test_args *pta = &perf_test_args; - struct perf_test_vcpu_args *vcpu_args = &pta->vcpu_args[vcpu_idx]; - struct guest_random_state rand_state; - uint64_t gva; - uint64_t pages; - uint64_t addr; - uint64_t page; - int i; - - rand_state = new_guest_random_state(pta->random_seed + vcpu_idx); - - gva = vcpu_args->gva; - pages = vcpu_args->pages; - - /* Make sure vCPU args data structure is not corrupt. */ - GUEST_ASSERT(vcpu_args->vcpu_idx == vcpu_idx); - - while (true) { - for (i = 0; i < pages; i++) { - if (pta->random_access) - page = guest_random_u32(&rand_state) % pages; - else - page = i; - - addr = gva + (page * pta->guest_page_size); - - if (guest_random_u32(&rand_state) % 100 < pta->write_percent) - *(uint64_t *)addr = 0x0123456789ABCDEF; - else - READ_ONCE(*(uint64_t *)addr); - } - - GUEST_SYNC(1); - } -} - -void perf_test_setup_vcpus(struct kvm_vm *vm, int nr_vcpus, - struct kvm_vcpu *vcpus[], - uint64_t vcpu_memory_bytes, - bool partition_vcpu_memory_access) -{ - struct perf_test_args *pta = &perf_test_args; - struct perf_test_vcpu_args *vcpu_args; - int i; - - for (i = 0; i < nr_vcpus; i++) { - vcpu_args = &pta->vcpu_args[i]; - - vcpu_args->vcpu = vcpus[i]; - vcpu_args->vcpu_idx = i; - - if (partition_vcpu_memory_access) { - vcpu_args->gva = guest_test_virt_mem + - (i * vcpu_memory_bytes); - vcpu_args->pages = vcpu_memory_bytes / - pta->guest_page_size; - vcpu_args->gpa = pta->gpa + (i * vcpu_memory_bytes); - } else { - vcpu_args->gva = guest_test_virt_mem; - vcpu_args->pages = (nr_vcpus * vcpu_memory_bytes) / - pta->guest_page_size; - vcpu_args->gpa = pta->gpa; - } - - vcpu_args_set(vcpus[i], 1, i); - - pr_debug("Added VCPU %d with test mem gpa [%lx, %lx)\n", - i, vcpu_args->gpa, vcpu_args->gpa + - (vcpu_args->pages * pta->guest_page_size)); - } -} - -struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_vcpus, - uint64_t vcpu_memory_bytes, int slots, - enum vm_mem_backing_src_type backing_src, - bool partition_vcpu_memory_access) -{ - struct perf_test_args *pta = &perf_test_args; - struct kvm_vm *vm; - uint64_t guest_num_pages, slot0_pages = 0; - uint64_t backing_src_pagesz = get_backing_src_pagesz(backing_src); - uint64_t region_end_gfn; - int i; - - pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode)); - - /* By default vCPUs will write to memory. */ - pta->write_percent = 100; - - /* - * Snapshot the non-huge page size. This is used by the guest code to - * access/dirty pages at the logging granularity. - */ - pta->guest_page_size = vm_guest_mode_params[mode].page_size; - - guest_num_pages = vm_adjust_num_guest_pages(mode, - (nr_vcpus * vcpu_memory_bytes) / pta->guest_page_size); - - TEST_ASSERT(vcpu_memory_bytes % getpagesize() == 0, - "Guest memory size is not host page size aligned."); - TEST_ASSERT(vcpu_memory_bytes % pta->guest_page_size == 0, - "Guest memory size is not guest page size aligned."); - TEST_ASSERT(guest_num_pages % slots == 0, - "Guest memory cannot be evenly divided into %d slots.", - slots); - - /* - * If using nested, allocate extra pages for the nested page tables and - * in-memory data structures. - */ - if (pta->nested) - slot0_pages += perf_test_nested_pages(nr_vcpus); - - /* - * Pass guest_num_pages to populate the page tables for test memory. - * The memory is also added to memslot 0, but that's a benign side - * effect as KVM allows aliasing HVAs in meslots. - */ - vm = __vm_create_with_vcpus(mode, nr_vcpus, slot0_pages + guest_num_pages, - perf_test_guest_code, vcpus); - - pta->vm = vm; - - /* Put the test region at the top guest physical memory. */ - region_end_gfn = vm->max_gfn + 1; - -#ifdef __x86_64__ - /* - * When running vCPUs in L2, restrict the test region to 48 bits to - * avoid needing 5-level page tables to identity map L2. - */ - if (pta->nested) - region_end_gfn = min(region_end_gfn, (1UL << 48) / pta->guest_page_size); -#endif - /* - * If there should be more memory in the guest test region than there - * can be pages in the guest, it will definitely cause problems. - */ - TEST_ASSERT(guest_num_pages < region_end_gfn, - "Requested more guest memory than address space allows.\n" - " guest pages: %" PRIx64 " max gfn: %" PRIx64 - " nr_vcpus: %d wss: %" PRIx64 "]\n", - guest_num_pages, region_end_gfn - 1, nr_vcpus, vcpu_memory_bytes); - - pta->gpa = (region_end_gfn - guest_num_pages - 1) * pta->guest_page_size; - pta->gpa = align_down(pta->gpa, backing_src_pagesz); -#ifdef __s390x__ - /* Align to 1M (segment size) */ - pta->gpa = align_down(pta->gpa, 1 << 20); -#endif - pta->size = guest_num_pages * pta->guest_page_size; - pr_info("guest physical test memory: [0x%lx, 0x%lx)\n", - pta->gpa, pta->gpa + pta->size); - - /* Add extra memory slots for testing */ - for (i = 0; i < slots; i++) { - uint64_t region_pages = guest_num_pages / slots; - vm_paddr_t region_start = pta->gpa + region_pages * pta->guest_page_size * i; - - vm_userspace_mem_region_add(vm, backing_src, region_start, - PERF_TEST_MEM_SLOT_INDEX + i, - region_pages, 0); - } - - /* Do mapping for the demand paging memory slot */ - virt_map(vm, guest_test_virt_mem, pta->gpa, guest_num_pages); - - perf_test_setup_vcpus(vm, nr_vcpus, vcpus, vcpu_memory_bytes, - partition_vcpu_memory_access); - - if (pta->nested) { - pr_info("Configuring vCPUs to run in L2 (nested).\n"); - perf_test_setup_nested(vm, nr_vcpus, vcpus); - } - - ucall_init(vm, NULL); - - /* Export the shared variables to the guest. */ - sync_global_to_guest(vm, perf_test_args); - - return vm; -} - -void perf_test_destroy_vm(struct kvm_vm *vm) -{ - ucall_uninit(vm); - kvm_vm_free(vm); -} - -void perf_test_set_write_percent(struct kvm_vm *vm, uint32_t write_percent) -{ - perf_test_args.write_percent = write_percent; - sync_global_to_guest(vm, perf_test_args.write_percent); -} - -void perf_test_set_random_seed(struct kvm_vm *vm, uint32_t random_seed) -{ - perf_test_args.random_seed = random_seed; - sync_global_to_guest(vm, perf_test_args.random_seed); -} - -void perf_test_set_random_access(struct kvm_vm *vm, bool random_access) -{ - perf_test_args.random_access = random_access; - sync_global_to_guest(vm, perf_test_args.random_access); -} - -uint64_t __weak perf_test_nested_pages(int nr_vcpus) -{ - return 0; -} - -void __weak perf_test_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu **vcpus) -{ - pr_info("%s() not support on this architecture, skipping.\n", __func__); - exit(KSFT_SKIP); -} - -static void *vcpu_thread_main(void *data) -{ - struct vcpu_thread *vcpu = data; - int vcpu_idx = vcpu->vcpu_idx; - - if (perf_test_args.pin_vcpus) - kvm_pin_this_task_to_pcpu(perf_test_args.vcpu_to_pcpu[vcpu_idx]); - - WRITE_ONCE(vcpu->running, true); - - /* - * Wait for all vCPU threads to be up and running before calling the test- - * provided vCPU thread function. This prevents thread creation (which - * requires taking the mmap_sem in write mode) from interfering with the - * guest faulting in its memory. - */ - while (!READ_ONCE(all_vcpu_threads_running)) - ; - - vcpu_thread_fn(&perf_test_args.vcpu_args[vcpu_idx]); - - return NULL; -} - -void perf_test_start_vcpu_threads(int nr_vcpus, - void (*vcpu_fn)(struct perf_test_vcpu_args *)) -{ - int i; - - vcpu_thread_fn = vcpu_fn; - WRITE_ONCE(all_vcpu_threads_running, false); - - for (i = 0; i < nr_vcpus; i++) { - struct vcpu_thread *vcpu = &vcpu_threads[i]; - - vcpu->vcpu_idx = i; - WRITE_ONCE(vcpu->running, false); - - pthread_create(&vcpu->thread, NULL, vcpu_thread_main, vcpu); - } - - for (i = 0; i < nr_vcpus; i++) { - while (!READ_ONCE(vcpu_threads[i].running)) - ; - } - - WRITE_ONCE(all_vcpu_threads_running, true); -} - -void perf_test_join_vcpu_threads(int nr_vcpus) -{ - int i; - - for (i = 0; i < nr_vcpus; i++) - pthread_join(vcpu_threads[i].thread, NULL); -} |