kvm: selftests: dirty_log_test: always use -t

There's no reason not to always test the topmost physical
addresses, and if the user wants to try lower addresses
then '-p' (used to be '-o before this patch) can be used.
Let's remove the '-t' option and just always do what it did.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index f68eee946129705497e32d1a888deef8a530a6f4..9078b571c562eff19e21e709db36b9092999e6f1 100644 (file)
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -51,10 +51,16 @@ static uint64_t random_array[TEST_PAGES_PER_LOOP];
 static uint64_t iteration;
 
 /*
- * GPA offset of the testing memory slot. Must be bigger than
- * DEFAULT_GUEST_PHY_PAGES * PAGE_SIZE.
+ * Guest physical memory offset of the testing memory slot.
+ * This will be set to the topmost valid physical address minus
+ * the test memory size.
+ */
+static uint64_t guest_test_phys_mem;
+
+/*
+ * Guest virtual memory offset of the testing memory slot.
+ * Must not conflict with identity mapped test code.
  */
-static uint64_t guest_test_phys_mem = DEFAULT_GUEST_TEST_MEM;
 static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM;
 
 /*
@@ -225,7 +231,7 @@ static struct kvm_vm *create_vm(enum vm_guest_mode mode, uint32_t vcpuid,
 }
 
 static void run_test(enum vm_guest_mode mode, unsigned long iterations,
-                    unsigned long interval, bool top_offset)
+                    unsigned long interval)
 {
        unsigned int guest_pa_bits, guest_page_shift;
        pthread_t vcpu_thread;
@@ -273,7 +279,7 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
        host_num_pages = (guest_num_pages * guest_page_size) / host_page_size +
                         !!((guest_num_pages * guest_page_size) % host_page_size);
 
-       if (top_offset) {
+       if (!guest_test_phys_mem) {
                guest_test_phys_mem = (max_gfn - guest_num_pages) * guest_page_size;
                guest_test_phys_mem &= ~(host_page_size - 1);
        }
@@ -381,16 +387,14 @@ static void help(char *name)
 
        puts("");
        printf("usage: %s [-h] [-i iterations] [-I interval] "
-              "[-o offset] [-t] [-m mode]\n", name);
+              "[-p offset] [-m mode]\n", name);
        puts("");
        printf(" -i: specify iteration counts (default: %"PRIu64")\n",
               TEST_HOST_LOOP_N);
        printf(" -I: specify interval in ms (default: %"PRIu64" ms)\n",
               TEST_HOST_LOOP_INTERVAL);
-       printf(" -o: guest test memory offset (default: 0x%lx)\n",
-              DEFAULT_GUEST_TEST_MEM);
-       printf(" -t: map guest test memory at the top of the allowed "
-              "physical address range\n");
+       printf(" -p: specify guest physical test memory offset\n"
+              "     Warning: a low offset can conflict with the loaded test code.\n");
        printf(" -m: specify the guest mode ID to test "
               "(default: test all supported modes)\n"
               "     This option may be used multiple times.\n"
@@ -410,7 +414,6 @@ int main(int argc, char *argv[])
        unsigned long iterations = TEST_HOST_LOOP_N;
        unsigned long interval = TEST_HOST_LOOP_INTERVAL;
        bool mode_selected = false;
-       bool top_offset = false;
        unsigned int mode;
        int opt, i;
 
@@ -421,7 +424,7 @@ int main(int argc, char *argv[])
        }
 #endif
 
-       while ((opt = getopt(argc, argv, "hi:I:o:tm:")) != -1) {
+       while ((opt = getopt(argc, argv, "hi:I:p:m:")) != -1) {
                switch (opt) {
                case 'i':
                        iterations = strtol(optarg, NULL, 10);
@@ -429,12 +432,9 @@ int main(int argc, char *argv[])
                case 'I':
                        interval = strtol(optarg, NULL, 10);
                        break;
-               case 'o':
+               case 'p':
                        guest_test_phys_mem = strtoull(optarg, NULL, 0);
                        break;
-               case 't':
-                       top_offset = true;
-                       break;
                case 'm':
                        if (!mode_selected) {
                                for (i = 0; i < NUM_VM_MODES; ++i)
@@ -455,8 +455,6 @@ int main(int argc, char *argv[])
 
        TEST_ASSERT(iterations > 2, "Iterations must be greater than two");
        TEST_ASSERT(interval > 0, "Interval must be greater than zero");
-       TEST_ASSERT(!top_offset || guest_test_phys_mem == DEFAULT_GUEST_TEST_MEM,
-                   "Cannot use both -o [offset] and -t at the same time");
 
        DEBUG("Test iterations: %"PRIu64", interval: %"PRIu64" (ms)\n",
              iterations, interval);
@@ -470,7 +468,7 @@ int main(int argc, char *argv[])
                            "Guest mode ID %d (%s) not supported.",
                            vm_guest_modes[i].mode,
                            vm_guest_mode_string(vm_guest_modes[i].mode));
-               run_test(vm_guest_modes[i].mode, iterations, interval, top_offset);
+               run_test(vm_guest_modes[i].mode, iterations, interval);
        }
 
        return 0;