1 files changed, 93 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
new file mode 100644
index 000000000000..689e97c27ee2
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tools/testing/selftests/kvm/lib/test_util.c
+ *
+ * Copyright (C) 2020, Google LLC.
+ */
+#include <stdlib.h>
+#include <ctype.h>
+#include <limits.h>
+#include <assert.h>
+#include "test_util.h"
+
+/*
+ * Parses "[0-9]+[kmgt]?".
+ */
+size_t parse_size(const char *size)
+{
+	size_t base;
+	char *scale;
+	int shift = 0;
+
+	TEST_ASSERT(size && isdigit(size[0]), "Need at least one digit in '%s'", size);
+
+	base = strtoull(size, &scale, 0);
+
+	TEST_ASSERT(base != ULLONG_MAX, "Overflow parsing size!");
+
+	switch (tolower(*scale)) {
+	case 't':
+		shift = 40;
+		break;
+	case 'g':
+		shift = 30;
+		break;
+	case 'm':
+		shift = 20;
+		break;
+	case 'k':
+		shift = 10;
+		break;
+	case 'b':
+	case '\0':
+		shift = 0;
+		break;
+	default:
+		TEST_ASSERT(false, "Unknown size letter %c", *scale);
+	}
+
+	TEST_ASSERT((base << shift) >> shift == base, "Overflow scaling size!");
+
+	return base << shift;
+}
+
+int64_t timespec_to_ns(struct timespec ts)
+{
+	return (int64_t)ts.tv_nsec + 1000000000LL * (int64_t)ts.tv_sec;
+}
+
+struct timespec timespec_add_ns(struct timespec ts, int64_t ns)
+{
+	struct timespec res;
+
+	res.tv_nsec = ts.tv_nsec + ns;
+	res.tv_sec = ts.tv_sec + res.tv_nsec / 1000000000LL;
+	res.tv_nsec %= 1000000000LL;
+
+	return res;
+}
+
+struct timespec timespec_add(struct timespec ts1, struct timespec ts2)
+{
+	int64_t ns1 = timespec_to_ns(ts1);
+	int64_t ns2 = timespec_to_ns(ts2);
+	return timespec_add_ns((struct timespec){0}, ns1 + ns2);
+}
+
+struct timespec timespec_sub(struct timespec ts1, struct timespec ts2)
+{
+	int64_t ns1 = timespec_to_ns(ts1);
+	int64_t ns2 = timespec_to_ns(ts2);
+	return timespec_add_ns((struct timespec){0}, ns1 - ns2);
+}
+
+void print_skip(const char *fmt, ...)
+{
+	va_list ap;
+
+	assert(fmt);
+	va_start(ap, fmt);
+	vprintf(fmt, ap);
+	va_end(ap);
+	puts(", skipping test");
+}