[PATCH 10/14] KVM: selftests: Use a single binary for dirty/clear log test

From: Peter Xu
Date: Tue Feb 04 2020 - 21:59:27 EST

Remove the clear_dirty_log test, instead merge it into the existing
dirty_log_test. It should be cleaner to use this single binary to do
both tests, also it's a preparation for the upcoming dirty ring test.

The default test will still be the dirty_log test. To run the clear
dirty log test, we need to specify "-M clear-log".

Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
tools/testing/selftests/kvm/Makefile | 2 -
.../selftests/kvm/clear_dirty_log_test.c | 2 -
tools/testing/selftests/kvm/dirty_log_test.c | 131 +++++++++++++++---
3 files changed, 110 insertions(+), 25 deletions(-)
delete mode 100644 tools/testing/selftests/kvm/clear_dirty_log_test.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 89bf05d4c2f3..9744966a48c5 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -26,12 +26,10 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
-TEST_GEN_PROGS_x86_64 += clear_dirty_log_test
TEST_GEN_PROGS_x86_64 += dirty_log_test
TEST_GEN_PROGS_x86_64 += demand_paging_test
TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus

-TEST_GEN_PROGS_aarch64 += clear_dirty_log_test
TEST_GEN_PROGS_aarch64 += dirty_log_test
TEST_GEN_PROGS_aarch64 += demand_paging_test
TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
diff --git a/tools/testing/selftests/kvm/clear_dirty_log_test.c b/tools/testing/selftests/kvm/clear_dirty_log_test.c
deleted file mode 100644
index 749336937d37..000000000000
--- a/tools/testing/selftests/kvm/clear_dirty_log_test.c
+++ /dev/null
@@ -1,2 +0,0 @@
-#define USE_CLEAR_DIRTY_LOG
-#include "dirty_log_test.c"
diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index 3c0ffd34b3b0..a8ae8c0042a8 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -128,6 +128,66 @@ static uint64_t host_dirty_count;
static uint64_t host_clear_count;
static uint64_t host_track_next_count;

+enum log_mode_t {
+ /* Only use KVM_GET_DIRTY_LOG for logging */
+ LOG_MODE_DIRTY_LOG = 0,
+
+ /* Use both KVM_[GET|CLEAR]_DIRTY_LOG for logging */
+ LOG_MODE_CLERA_LOG = 1,
+
+ LOG_MODE_NUM,
+};
+
+/* Mode of logging. Default is LOG_MODE_DIRTY_LOG */
+static enum log_mode_t host_log_mode;
+
+static void clear_log_create_vm_done(struct kvm_vm *vm)
+{
+ struct kvm_enable_cap cap = {};
+
+ if (!kvm_check_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2)) {
+ fprintf(stderr, "KVM_CLEAR_DIRTY_LOG not available, skipping tests\n");
+ exit(KSFT_SKIP);
+ }
+
+ cap.cap = KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2;
+ cap.args[0] = 1;
+ vm_enable_cap(vm, &cap);
+}
+
+static void dirty_log_collect_dirty_pages(struct kvm_vm *vm, int slot,
+ void *bitmap, uint32_t num_pages)
+{
+ kvm_vm_get_dirty_log(vm, slot, bitmap);
+}
+
+static void clear_log_collect_dirty_pages(struct kvm_vm *vm, int slot,
+ void *bitmap, uint32_t num_pages)
+{
+ kvm_vm_get_dirty_log(vm, slot, bitmap);
+ kvm_vm_clear_dirty_log(vm, slot, bitmap, 0, num_pages);
+}
+
+struct log_mode {
+ const char *name;
+ /* Hook when the vm creation is done (before vcpu creation) */
+ void (*create_vm_done)(struct kvm_vm *vm);
+ /* Hook to collect the dirty pages into the bitmap provided */
+ void (*collect_dirty_pages) (struct kvm_vm *vm, int slot,
+ void *bitmap, uint32_t num_pages);
+} log_modes[LOG_MODE_NUM] = {
+ {
+ .name = "dirty-log",
+ .create_vm_done = NULL,
+ .collect_dirty_pages = dirty_log_collect_dirty_pages,
+ },
+ {
+ .name = "clear-log",
+ .create_vm_done = clear_log_create_vm_done,
+ .collect_dirty_pages = clear_log_collect_dirty_pages,
+ },
+};
+
/*
* We use this bitmap to track some pages that should have its dirty
* bit set in the _next_ iteration. For example, if we detected the
@@ -137,6 +197,33 @@ static uint64_t host_track_next_count;
*/
static unsigned long *host_bmap_track;

+static void log_modes_dump(void)
+{
+ int i;
+
+ for (i = 0; i < LOG_MODE_NUM; i++)
+ printf("%s, ", log_modes[i].name);
+ puts("\b\b \b\b");
+}
+
+static void log_mode_create_vm_done(struct kvm_vm *vm)
+{
+ struct log_mode *mode = &log_modes[host_log_mode];
+
+ if (mode->create_vm_done)
+ mode->create_vm_done(vm);
+}
+
+static void log_mode_collect_dirty_pages(struct kvm_vm *vm, int slot,
+ void *bitmap, uint32_t num_pages)
+{
+ struct log_mode *mode = &log_modes[host_log_mode];
+
+ TEST_ASSERT(mode->collect_dirty_pages != NULL,
+ "collect_dirty_pages() is required for any log mode!");
+ mode->collect_dirty_pages(vm, slot, bitmap, num_pages);
+}
+
static void generate_random_array(uint64_t *guest_array, uint64_t size)
{
uint64_t i;
@@ -257,6 +344,7 @@ static struct kvm_vm *create_vm(enum vm_guest_mode mode, uint32_t vcpuid,
#ifdef __x86_64__
vm_create_irqchip(vm);
#endif
+ log_mode_create_vm_done(vm);
vm_vcpu_add_default(vm, vcpuid, guest_code);
return vm;
}
@@ -316,14 +404,6 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
bmap = bitmap_alloc(host_num_pages);
host_bmap_track = bitmap_alloc(host_num_pages);

-#ifdef USE_CLEAR_DIRTY_LOG
- struct kvm_enable_cap cap = {};
-
- cap.cap = KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2;
- cap.args[0] = 1;
- vm_enable_cap(vm, &cap);
-#endif
-
/* Add an extra memory slot for testing dirty logging */
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
guest_test_phys_mem,
@@ -364,11 +444,8 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
while (iteration < iterations) {
/* Give the vcpu thread some time to dirty some pages */
usleep(interval * 1000);
- kvm_vm_get_dirty_log(vm, TEST_MEM_SLOT_INDEX, bmap);
-#ifdef USE_CLEAR_DIRTY_LOG
- kvm_vm_clear_dirty_log(vm, TEST_MEM_SLOT_INDEX, bmap, 0,
- host_num_pages);
-#endif
+ log_mode_collect_dirty_pages(vm, TEST_MEM_SLOT_INDEX,
+ bmap, host_num_pages);
vm_dirty_log_verify(bmap);
iteration++;
sync_global_to_guest(vm, iteration);
@@ -413,6 +490,9 @@ static void help(char *name)
TEST_HOST_LOOP_INTERVAL);
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 host logging mode "
+ "(default: log-dirty). Supported modes: \n\t");
+ log_modes_dump();
printf(" -m: specify the guest mode ID to test "
"(default: test all supported modes)\n"
" This option may be used multiple times.\n"
@@ -437,13 +517,6 @@ int main(int argc, char *argv[])
unsigned int host_ipa_limit;
#endif

-#ifdef USE_CLEAR_DIRTY_LOG
- if (!kvm_check_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2)) {
- fprintf(stderr, "KVM_CLEAR_DIRTY_LOG not available, skipping tests\n");
- exit(KSFT_SKIP);
- }
-#endif
-
#ifdef __x86_64__
vm_guest_mode_params_init(VM_MODE_PXXV48_4K, true, true);
#endif
@@ -463,7 +536,7 @@ 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:")) != -1) {
+ while ((opt = getopt(argc, argv, "hi:I:p:m:M:")) != -1) {
switch (opt) {
case 'i':
iterations = strtol(optarg, NULL, 10);
@@ -485,6 +558,22 @@ int main(int argc, char *argv[])
"Guest mode ID %d too big", mode);
vm_guest_mode_params[mode].enabled = true;
break;
+ case 'M':
+ for (i = 0; i < LOG_MODE_NUM; i++) {
+ if (!strcmp(optarg, log_modes[i].name)) {
+ DEBUG("Setting log mode to: '%s'\n",
+ optarg);
+ host_log_mode = i;
+ break;
+ }
+ }
+ if (i == LOG_MODE_NUM) {
+ printf("Log mode '%s' is invalid. "
+ "Please choose from: ", optarg);
+ log_modes_dump();
+ exit(-1);
+ }
+ break;
case 'h':
default:
help(argv[0]);
--
2.24.1