191 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * KVM memslot modification stress test4 * Adapted from demand_paging_test.c5 *6 * Copyright (C) 2018, Red Hat, Inc.7 * Copyright (C) 2020, Google, Inc.8 */9#include <stdio.h>10#include <stdlib.h>11#include <sys/syscall.h>12#include <unistd.h>13#include <asm/unistd.h>14#include <time.h>15#include <poll.h>16#include <pthread.h>17#include <linux/bitmap.h>18#include <linux/bitops.h>19#include <linux/userfaultfd.h>20 21#include "memstress.h"22#include "processor.h"23#include "test_util.h"24#include "guest_modes.h"25 26#define DUMMY_MEMSLOT_INDEX 727 28#define DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS 1029 30 31static int nr_vcpus = 1;32static uint64_t guest_percpu_mem_size = DEFAULT_PER_VCPU_MEM_SIZE;33 34static void vcpu_worker(struct memstress_vcpu_args *vcpu_args)35{36 struct kvm_vcpu *vcpu = vcpu_args->vcpu;37 struct kvm_run *run;38 int ret;39 40 run = vcpu->run;41 42 /* Let the guest access its memory until a stop signal is received */43 while (!READ_ONCE(memstress_args.stop_vcpus)) {44 ret = _vcpu_run(vcpu);45 TEST_ASSERT(ret == 0, "vcpu_run failed: %d", ret);46 47 if (get_ucall(vcpu, NULL) == UCALL_SYNC)48 continue;49 50 TEST_ASSERT(false,51 "Invalid guest sync status: exit_reason=%s\n",52 exit_reason_str(run->exit_reason));53 }54}55 56static void add_remove_memslot(struct kvm_vm *vm, useconds_t delay,57 uint64_t nr_modifications)58{59 uint64_t pages = max_t(int, vm->page_size, getpagesize()) / vm->page_size;60 uint64_t gpa;61 int i;62 63 /*64 * Add the dummy memslot just below the memstress memslot, which is65 * at the top of the guest physical address space.66 */67 gpa = memstress_args.gpa - pages * vm->page_size;68 69 for (i = 0; i < nr_modifications; i++) {70 usleep(delay);71 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, gpa,72 DUMMY_MEMSLOT_INDEX, pages, 0);73 74 vm_mem_region_delete(vm, DUMMY_MEMSLOT_INDEX);75 }76}77 78struct test_params {79 useconds_t delay;80 uint64_t nr_iterations;81 bool partition_vcpu_memory_access;82 bool disable_slot_zap_quirk;83};84 85static void run_test(enum vm_guest_mode mode, void *arg)86{87 struct test_params *p = arg;88 struct kvm_vm *vm;89 90 vm = memstress_create_vm(mode, nr_vcpus, guest_percpu_mem_size, 1,91 VM_MEM_SRC_ANONYMOUS,92 p->partition_vcpu_memory_access);93#ifdef __x86_64__94 if (p->disable_slot_zap_quirk)95 vm_enable_cap(vm, KVM_CAP_DISABLE_QUIRKS2, KVM_X86_QUIRK_SLOT_ZAP_ALL);96 97 pr_info("Memslot zap quirk %s\n", p->disable_slot_zap_quirk ?98 "disabled" : "enabled");99#endif100 101 pr_info("Finished creating vCPUs\n");102 103 memstress_start_vcpu_threads(nr_vcpus, vcpu_worker);104 105 pr_info("Started all vCPUs\n");106 107 add_remove_memslot(vm, p->delay, p->nr_iterations);108 109 memstress_join_vcpu_threads(nr_vcpus);110 pr_info("All vCPU threads joined\n");111 112 memstress_destroy_vm(vm);113}114 115static void help(char *name)116{117 puts("");118 printf("usage: %s [-h] [-m mode] [-d delay_usec] [-q]\n"119 " [-b memory] [-v vcpus] [-o] [-i iterations]\n", name);120 guest_modes_help();121 printf(" -d: add a delay between each iteration of adding and\n"122 " deleting a memslot in usec.\n");123 printf(" -q: Disable memslot zap quirk.\n");124 printf(" -b: specify the size of the memory region which should be\n"125 " accessed by each vCPU. e.g. 10M or 3G.\n"126 " Default: 1G\n");127 printf(" -v: specify the number of vCPUs to run.\n");128 printf(" -o: Overlap guest memory accesses instead of partitioning\n"129 " them into a separate region of memory for each vCPU.\n");130 printf(" -i: specify the number of iterations of adding and removing\n"131 " a memslot.\n"132 " Default: %d\n", DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS);133 puts("");134 exit(0);135}136 137int main(int argc, char *argv[])138{139 int max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS);140 int opt;141 struct test_params p = {142 .delay = 0,143 .nr_iterations = DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS,144 .partition_vcpu_memory_access = true145 };146 147 guest_modes_append_default();148 149 while ((opt = getopt(argc, argv, "hm:d:qb:v:oi:")) != -1) {150 switch (opt) {151 case 'm':152 guest_modes_cmdline(optarg);153 break;154 case 'd':155 p.delay = atoi_non_negative("Delay", optarg);156 break;157 case 'b':158 guest_percpu_mem_size = parse_size(optarg);159 break;160 case 'v':161 nr_vcpus = atoi_positive("Number of vCPUs", optarg);162 TEST_ASSERT(nr_vcpus <= max_vcpus,163 "Invalid number of vcpus, must be between 1 and %d",164 max_vcpus);165 break;166 case 'o':167 p.partition_vcpu_memory_access = false;168 break;169 case 'i':170 p.nr_iterations = atoi_positive("Number of iterations", optarg);171 break;172#ifdef __x86_64__173 case 'q':174 p.disable_slot_zap_quirk = true;175 176 TEST_REQUIRE(kvm_check_cap(KVM_CAP_DISABLE_QUIRKS2) &177 KVM_X86_QUIRK_SLOT_ZAP_ALL);178 break;179#endif180 case 'h':181 default:182 help(argv[0]);183 break;184 }185 }186 187 for_each_guest_mode(run_test, &p);188 189 return 0;190}191