KVM: selftests: Add atoi_positive() and atoi_non_negative() for input validation

Many KVM selftests take command line arguments which are supposed to be
positive (>0) or non-negative (>=0). Some tests do these validation and
some missed adding the check.

Add atoi_positive() and atoi_non_negative() to validate inputs in
selftests before proceeding to use those values.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221103191719.1559407-7-vipinsh@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

tools/testing/selftests/kvm/aarch64/arch_timer.c

@@ -414,36 +414,21 @@ static bool parse_args(int argc, char *argv[])
 	while ((opt = getopt(argc, argv, "hn:i:p:m:")) != -1) {
 		switch (opt) {
 		case 'n':
-			test_args.nr_vcpus = atoi_paranoid(optarg);
-			if (test_args.nr_vcpus <= 0) {
-				pr_info("Positive value needed for -n\n");
-				goto err;
-			} else if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
+			test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
+			if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
 				pr_info("Max allowed vCPUs: %u\n",
 					KVM_MAX_VCPUS);
 				goto err;
 			}
 			break;
 		case 'i':
-			test_args.nr_iter = atoi_paranoid(optarg);
-			if (test_args.nr_iter <= 0) {
-				pr_info("Positive value needed for -i\n");
-				goto err;
-			}
+			test_args.nr_iter = atoi_positive("Number of iterations", optarg);
 			break;
 		case 'p':
-			test_args.timer_period_ms = atoi_paranoid(optarg);
-			if (test_args.timer_period_ms <= 0) {
-				pr_info("Positive value needed for -p\n");
-				goto err;
-			}
+			test_args.timer_period_ms = atoi_positive("Periodicity", optarg);
 			break;
 		case 'm':
-			test_args.migration_freq_ms = atoi_paranoid(optarg);
-			if (test_args.migration_freq_ms < 0) {
-				pr_info("0 or positive value needed for -m\n");
-				goto err;
-			}
+			test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
 			break;
 		case 'h':
 		default:

tools/testing/selftests/kvm/aarch64/debug-exceptions.c

@@ -423,7 +423,7 @@ int main(int argc, char *argv[])
 	while ((opt = getopt(argc, argv, "i:")) != -1) {
 		switch (opt) {
 		case 'i':
-			ss_iteration = atoi_paranoid(optarg);
+			ss_iteration = atoi_positive("Number of iterations", optarg);
 			break;
 		case 'h':
 		default:

tools/testing/selftests/kvm/aarch64/vgic_irq.c

@@ -824,7 +824,7 @@ int main(int argc, char **argv)
 	while ((opt = getopt(argc, argv, "hn:e:l:")) != -1) {
 		switch (opt) {
 		case 'n':
-			nr_irqs = atoi_paranoid(optarg);
+			nr_irqs = atoi_non_negative("Number of IRQs", optarg);
 			if (nr_irqs > 1024 || nr_irqs % 32)
 				help(argv[0]);
 			break;

tools/testing/selftests/kvm/access_tracking_perf_test.c

@@ -368,7 +368,7 @@ int main(int argc, char *argv[])
 			params.vcpu_memory_bytes = parse_size(optarg);
 			break;
 		case 'v':
-			params.nr_vcpus = atoi_paranoid(optarg);
+			params.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
 			break;
 		case 'o':
 			overlap_memory_access = true;

tools/testing/selftests/kvm/demand_paging_test.c

@@ -427,8 +427,8 @@ int main(int argc, char *argv[])
 			p.src_type = parse_backing_src_type(optarg);
 			break;
 		case 'v':
-			nr_vcpus = atoi_paranoid(optarg);
-			TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
+			nr_vcpus = atoi_positive("Number of vCPUs", optarg);
+			TEST_ASSERT(nr_vcpus <= max_vcpus,
 				    "Invalid number of vcpus, must be between 1 and %d", max_vcpus);
 			break;
 		case 'o':

tools/testing/selftests/kvm/dirty_log_perf_test.c

@@ -416,9 +416,7 @@ int main(int argc, char *argv[])
 			run_vcpus_while_disabling_dirty_logging = true;
 			break;
 		case 'f':
-			p.wr_fract = atoi_paranoid(optarg);
-			TEST_ASSERT(p.wr_fract >= 1,
-				    "Write fraction cannot be less than one");
+			p.wr_fract = atoi_positive("Write fraction", optarg);
 			break;
 		case 'g':
 			dirty_log_manual_caps = 0;
@@ -427,7 +425,7 @@ int main(int argc, char *argv[])
 			help(argv[0]);
 			break;
 		case 'i':
-			p.iterations = atoi_paranoid(optarg);
+			p.iterations = atoi_positive("Number of iterations", optarg);
 			break;
 		case 'm':
 			guest_modes_cmdline(optarg);
@@ -445,12 +443,12 @@ int main(int argc, char *argv[])
 			p.backing_src = parse_backing_src_type(optarg);
 			break;
 		case 'v':
-			nr_vcpus = atoi_paranoid(optarg);
-			TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
+			nr_vcpus = atoi_positive("Number of vCPUs", optarg);
+			TEST_ASSERT(nr_vcpus <= max_vcpus,
 				    "Invalid number of vcpus, must be between 1 and %d", max_vcpus);
 			break;
 		case 'x':
-			p.slots = atoi_paranoid(optarg);
+			p.slots = atoi_positive("Number of slots", optarg);
 			break;
 		default:
 			help(argv[0]);

tools/testing/selftests/kvm/include/test_util.h

@@ -154,4 +154,20 @@ static inline void *align_ptr_up(void *x, size_t size)
 
 int atoi_paranoid(const char *num_str);
 
+static inline uint32_t atoi_positive(const char *name, const char *num_str)
+{
+	int num = atoi_paranoid(num_str);
+
+	TEST_ASSERT(num > 0, "%s must be greater than 0, got '%s'", name, num_str);
+	return num;
+}
+
+static inline uint32_t atoi_non_negative(const char *name, const char *num_str)
+{
+	int num = atoi_paranoid(num_str);
+
+	TEST_ASSERT(num >= 0, "%s must be non-negative, got '%s'", name, num_str);
+	return num;
+}
+
 #endif /* SELFTEST_KVM_TEST_UTIL_H */

tools/testing/selftests/kvm/kvm_page_table_test.c

@@ -461,8 +461,8 @@ int main(int argc, char *argv[])
 			p.test_mem_size = parse_size(optarg);
 			break;
 		case 'v':
-			nr_vcpus = atoi_paranoid(optarg);
-			TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
+			nr_vcpus = atoi_positive("Number of vCPUs", optarg);
+			TEST_ASSERT(nr_vcpus <= max_vcpus,
 				    "Invalid number of vcpus, must be between 1 and %d", max_vcpus);
 			break;
 		case 's':

tools/testing/selftests/kvm/max_guest_memory_test.c

@@ -193,16 +193,13 @@ int main(int argc, char *argv[])
 	while ((opt = getopt(argc, argv, "c:h:m:s:H")) != -1) {
 		switch (opt) {
 		case 'c':
-			nr_vcpus = atoi_paranoid(optarg);
-			TEST_ASSERT(nr_vcpus > 0, "number of vcpus must be >0");
+			nr_vcpus = atoi_positive("Number of vCPUs", optarg);
 			break;
 		case 'm':
-			max_mem = 1ull * atoi_paranoid(optarg) * SZ_1G;
-			TEST_ASSERT(max_mem > 0, "memory size must be >0");
+			max_mem = 1ull * atoi_positive("Memory size", optarg) * SZ_1G;
 			break;
 		case 's':
-			slot_size = 1ull * atoi_paranoid(optarg) * SZ_1G;
-			TEST_ASSERT(slot_size > 0, "slot size must be >0");
+			slot_size = 1ull * atoi_positive("Slot size", optarg) * SZ_1G;
 			break;
 		case 'H':
 			hugepages = true;

tools/testing/selftests/kvm/memslot_modification_stress_test.c

@@ -156,16 +156,14 @@ int main(int argc, char *argv[])
 			guest_modes_cmdline(optarg);
 			break;
 		case 'd':
-			p.delay = atoi_paranoid(optarg);
-			TEST_ASSERT(p.delay >= 0,
-				    "A negative delay is not supported.");
+			p.delay = atoi_non_negative("Delay", optarg);
 			break;
 		case 'b':
 			guest_percpu_mem_size = parse_size(optarg);
 			break;
 		case 'v':
-			nr_vcpus = atoi_paranoid(optarg);
-			TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
+			nr_vcpus = atoi_positive("Number of vCPUs", optarg);
+			TEST_ASSERT(nr_vcpus <= max_vcpus,
 				    "Invalid number of vcpus, must be between 1 and %d",
 				    max_vcpus);
 			break;
@@ -173,7 +171,7 @@ int main(int argc, char *argv[])
 			p.partition_vcpu_memory_access = false;
 			break;
 		case 'i':
-			p.nr_iterations = atoi_paranoid(optarg);
+			p.nr_iterations = atoi_positive("Number of iterations", optarg);
 			break;
 		case 'h':
 		default:

tools/testing/selftests/kvm/memslot_perf_test.c

@@ -892,33 +892,21 @@ static bool parse_args(int argc, char *argv[],
 			}
 			break;
 		case 'f':
-			targs->tfirst = atoi_paranoid(optarg);
-			if (targs->tfirst < 0) {
-				pr_info("First test to run has to be non-negative\n");
-				return false;
-			}
+			targs->tfirst = atoi_non_negative("First test", optarg);
 			break;
 		case 'e':
-			targs->tlast = atoi_paranoid(optarg);
-			if (targs->tlast < 0 || targs->tlast >= NTESTS) {
+			targs->tlast = atoi_non_negative("Last test", optarg);
+			if (targs->tlast >= NTESTS) {
 				pr_info("Last test to run has to be non-negative and less than %zu\n",
 					NTESTS);
 				return false;
 			}
 			break;
 		case 'l':
-			targs->seconds = atoi_paranoid(optarg);
-			if (targs->seconds < 0) {
-				pr_info("Test length in seconds has to be non-negative\n");
-				return false;
-			}
+			targs->seconds = atoi_non_negative("Test length", optarg);
 			break;
 		case 'r':
-			targs->runs = atoi_paranoid(optarg);
-			if (targs->runs <= 0) {
-				pr_info("Runs per test has to be positive\n");
-				return false;
-			}
+			targs->runs = atoi_positive("Runs per test", optarg);
 			break;
 		}
 	}

tools/testing/selftests/kvm/set_memory_region_test.c

@@ -407,7 +407,7 @@ int main(int argc, char *argv[])
 
 #ifdef __x86_64__
 	if (argc > 1)
-		loops = atoi_paranoid(argv[1]);
+		loops = atoi_positive("Number of iterations", argv[1]);
 	else
 		loops = 10;
 

tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.c

@@ -241,7 +241,7 @@ int main(int argc, char **argv)
 	while ((opt = getopt(argc, argv, "hp:t:r")) != -1) {
 		switch (opt) {
 		case 'p':
-			reclaim_period_ms = atoi_paranoid(optarg);
+			reclaim_period_ms = atoi_non_negative("Reclaim period", optarg);
 			break;
 		case 't':
 			token = atoi_paranoid(optarg);
@@ -257,7 +257,6 @@ int main(int argc, char **argv)
 	}
 
 	TEST_REQUIRE(kvm_has_cap(KVM_CAP_VM_DISABLE_NX_HUGE_PAGES));
-	TEST_REQUIRE(reclaim_period_ms > 0);
 
 	__TEST_REQUIRE(token == MAGIC_TOKEN,
 		       "This test must be run with the magic token %d.\n"