It's only used to override the existing dirty ring size/count. If
with a bigger ring count, we test async of dirty ring. If with a
smaller ring count, we test ring full code path. Async is default.
It has no use for non-dirty-ring tests.
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
tools/testing/selftests/kvm/dirty_log_test.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index 6da97e4a9408..fb6c33dbaf35 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -163,6 +163,7 @@ enum log_mode_t {
/* Mode of logging. Default is LOG_MODE_DIRTY_LOG */
static enum log_mode_t host_log_mode;
pthread_t vcpu_thread;
+static uint32_t test_dirty_ring_count = TEST_DIRTY_RING_COUNT;
/* Only way to pass this to the signal handler */
struct kvm_vm *current_vm;
@@ -235,7 +236,7 @@ static void dirty_ring_create_vm_done(struct kvm_vm *vm)
* Switch to dirty ring mode after VM creation but before any
* of the vcpu creation.
*/
- vm_enable_dirty_ring(vm, TEST_DIRTY_RING_COUNT *
+ vm_enable_dirty_ring(vm, test_dirty_ring_count *
sizeof(struct kvm_dirty_gfn));
}
@@ -260,7 +261,7 @@ static uint32_t dirty_ring_collect_one(struct kvm_dirty_gfn *dirty_gfns,
DEBUG("ring %d: fetch: 0x%x, avail: 0x%x\n", index, fetch, avail);
while (fetch != avail) {
- cur = &dirty_gfns[fetch % TEST_DIRTY_RING_COUNT];
+ cur = &dirty_gfns[fetch % test_dirty_ring_count];
TEST_ASSERT(cur->pad == 0, "Padding is non-zero: 0x%x", cur->pad);
TEST_ASSERT(cur->slot == slot, "Slot number didn't match: "
"%u != %u", cur->slot, slot);
@@ -723,6 +724,9 @@ static void help(char *name)
printf("usage: %s [-h] [-i iterations] [-I interval] "
"[-p offset] [-m mode]\n", name);
puts("");
+ printf(" -c: specify dirty ring size, in number of entries\n");
+ printf(" (only useful for dirty-ring test; default: %"PRIu32")\n",
+ TEST_DIRTY_RING_COUNT);
printf(" -i: specify iteration counts (default: %"PRIu64")\n",
TEST_HOST_LOOP_N);
printf(" -I: specify interval in ms (default: %"PRIu64" ms)\n",
@@ -778,8 +782,11 @@ int main(int argc, char *argv[])
vm_guest_mode_params_init(VM_MODE_P40V48_4K, true, true);
#endif
- while ((opt = getopt(argc, argv, "hi:I:p:m:M:")) != -1) {
+ while ((opt = getopt(argc, argv, "c:hi:I:p:m:M:")) != -1) {
switch (opt) {
+ case 'c':
+ test_dirty_ring_count = strtol(optarg, NULL, 10);
+ break;
case 'i':
iterations = strtol(optarg, NULL, 10);
break;
--
2.24.1
