KVM: selftests: Use SZ_* macros from sizes.h in max_guest_memory_test.c

Replace size_1gb defined in max_guest_memory_test.c with the SZ_1G,
SZ_2G and SZ_4G from linux/sizes.h header file.
Signed-off-by: NVipin Sharma <vipinsh@google.com>
Reviewed-by: NSean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221103191719.1559407-5-vipinsh@google.comSigned-off-by: NSean Christopherson <seanjc@google.com>

tools/testing/selftests/kvm/max_guest_memory_test.c

@@ -11,6 +11,7 @@
 #include <linux/bitmap.h>
 #include <linux/bitops.h>
 #include <linux/atomic.h>
+#include <linux/sizes.h>
 
 #include "kvm_util.h"
 #include "test_util.h"
@@ -162,8 +163,7 @@ int main(int argc, char *argv[])
 	 * just below the 4gb boundary.  This test could create memory at
 	 * 1gb-3gb,but it's simpler to skip straight to 4gb.
 	 */
-	const uint64_t size_1gb = (1 << 30);
-	const uint64_t start_gpa = (4ull * size_1gb);
+	const uint64_t start_gpa = SZ_4G;
 	const int first_slot = 1;
 
 	struct timespec time_start, time_run1, time_reset, time_run2;
@@ -180,13 +180,13 @@ int main(int argc, char *argv[])
 	 * are quite common for x86, requires changing only max_mem (KVM allows
 	 * 32k memslots, 32k * 2gb == ~64tb of guest memory).
 	 */
-	slot_size = 2 * size_1gb;
+	slot_size = SZ_2G;
 
 	max_slots = kvm_check_cap(KVM_CAP_NR_MEMSLOTS);
 	TEST_ASSERT(max_slots > first_slot, "KVM is broken");
 
 	/* All KVM MMUs should be able to survive a 128gb guest. */
-	max_mem = 128 * size_1gb;
+	max_mem = 128ull * SZ_1G;
 
 	calc_default_nr_vcpus();
 
@@ -197,11 +197,11 @@ int main(int argc, char *argv[])
 			TEST_ASSERT(nr_vcpus > 0, "number of vcpus must be >0");
 			break;
 		case 'm':
-			max_mem = atoi_paranoid(optarg) * size_1gb;
+			max_mem = 1ull * atoi_paranoid(optarg) * SZ_1G;
 			TEST_ASSERT(max_mem > 0, "memory size must be >0");
 			break;
 		case 's':
-			slot_size = atoi_paranoid(optarg) * size_1gb;
+			slot_size = 1ull * atoi_paranoid(optarg) * SZ_1G;
 			TEST_ASSERT(slot_size > 0, "slot size must be >0");
 			break;
 		case 'H':
@@ -245,7 +245,7 @@ int main(int argc, char *argv[])
 
 #ifdef __x86_64__
 		/* Identity map memory in the guest using 1gb pages. */
-		for (i = 0; i < slot_size; i += size_1gb)
+		for (i = 0; i < slot_size; i += SZ_1G)
 			__virt_pg_map(vm, gpa + i, gpa + i, PG_LEVEL_1G);
 #else
 		for (i = 0; i < slot_size; i += vm->page_size)
@@ -260,7 +260,7 @@ int main(int argc, char *argv[])
 	vcpus = NULL;
 
 	pr_info("Running with %lugb of guest memory and %u vCPUs\n",
-		(gpa - start_gpa) / size_1gb, nr_vcpus);
+		(gpa - start_gpa) / SZ_1G, nr_vcpus);
 
 	rendezvous_with_vcpus(&time_start, "spawning");
 	rendezvous_with_vcpus(&time_run1, "run 1");