Re: [PATCH v4 02/11] KVM: arm64: selftests: Split arch_timer test code
From: Anup Patel
Date: Thu Dec 14 2023 - 01:42:09 EST
Hi Marc, Hi Oliver,
On Tue, Dec 12, 2023 at 2:49 PM Haibo Xu <haibo1.xu@xxxxxxxxx> wrote:
>
> Split the arch-neutral test code out of aarch64/arch_timer.c
> and put them into a common arch_timer.c. This is a preparation
> to share timer test codes in riscv.
>
> Suggested-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
> Signed-off-by: Haibo Xu <haibo1.xu@xxxxxxxxx>
> Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Can you please review this patch ?
We want to take this entire series through KVM RISC-V tree.
Regards,
Anup
> ---
> tools/testing/selftests/kvm/Makefile | 3 +-
> .../selftests/kvm/aarch64/arch_timer.c | 275 +-----------------
> tools/testing/selftests/kvm/arch_timer.c | 249 ++++++++++++++++
> .../testing/selftests/kvm/include/test_util.h | 2 +
> .../selftests/kvm/include/timer_test.h | 43 +++
> 5 files changed, 302 insertions(+), 270 deletions(-)
> create mode 100644 tools/testing/selftests/kvm/arch_timer.c
> create mode 100644 tools/testing/selftests/kvm/include/timer_test.h
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 2200f06b740b..4838ea899bbb 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -151,7 +151,6 @@ TEST_GEN_PROGS_x86_64 += system_counter_offset_test
> TEST_GEN_PROGS_EXTENDED_x86_64 += x86_64/nx_huge_pages_test
>
> TEST_GEN_PROGS_aarch64 += aarch64/aarch32_id_regs
> -TEST_GEN_PROGS_aarch64 += aarch64/arch_timer
> TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
> TEST_GEN_PROGS_aarch64 += aarch64/hypercalls
> TEST_GEN_PROGS_aarch64 += aarch64/page_fault_test
> @@ -163,6 +162,7 @@ TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
> TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq
> TEST_GEN_PROGS_aarch64 += aarch64/vpmu_counter_access
> TEST_GEN_PROGS_aarch64 += access_tracking_perf_test
> +TEST_GEN_PROGS_aarch64 += arch_timer
> TEST_GEN_PROGS_aarch64 += demand_paging_test
> TEST_GEN_PROGS_aarch64 += dirty_log_test
> TEST_GEN_PROGS_aarch64 += dirty_log_perf_test
> @@ -201,6 +201,7 @@ TEST_GEN_PROGS_riscv += kvm_page_table_test
> TEST_GEN_PROGS_riscv += set_memory_region_test
> TEST_GEN_PROGS_riscv += kvm_binary_stats_test
>
> +SPLIT_TESTS += arch_timer
> SPLIT_TESTS += get-reg-list
>
> TEST_PROGS += $(TEST_PROGS_$(ARCH_DIR))
> diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
> index 274b8465b42a..6fb47ba07e5b 100644
> --- a/tools/testing/selftests/kvm/aarch64/arch_timer.c
> +++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
> @@ -1,64 +1,19 @@
> // SPDX-License-Identifier: GPL-2.0-only
> /*
> - * arch_timer.c - Tests the aarch64 timer IRQ functionality
> - *
> * The test validates both the virtual and physical timer IRQs using
> - * CVAL and TVAL registers. This consitutes the four stages in the test.
> - * The guest's main thread configures the timer interrupt for a stage
> - * and waits for it to fire, with a timeout equal to the timer period.
> - * It asserts that the timeout doesn't exceed the timer period.
> - *
> - * On the other hand, upon receipt of an interrupt, the guest's interrupt
> - * handler validates the interrupt by checking if the architectural state
> - * is in compliance with the specifications.
> - *
> - * The test provides command-line options to configure the timer's
> - * period (-p), number of vCPUs (-n), and iterations per stage (-i).
> - * To stress-test the timer stack even more, an option to migrate the
> - * vCPUs across pCPUs (-m), at a particular rate, is also provided.
> + * CVAL and TVAL registers.
> *
> * Copyright (c) 2021, Google LLC.
> */
> #define _GNU_SOURCE
>
> -#include <stdlib.h>
> -#include <pthread.h>
> -#include <linux/kvm.h>
> -#include <linux/sizes.h>
> -#include <linux/bitmap.h>
> -#include <sys/sysinfo.h>
> -
> -#include "kvm_util.h"
> -#include "processor.h"
> -#include "delay.h"
> #include "arch_timer.h"
> +#include "delay.h"
> #include "gic.h"
> +#include "processor.h"
> +#include "timer_test.h"
> #include "vgic.h"
>
> -#define NR_VCPUS_DEF 4
> -#define NR_TEST_ITERS_DEF 5
> -#define TIMER_TEST_PERIOD_MS_DEF 10
> -#define TIMER_TEST_ERR_MARGIN_US 100
> -#define TIMER_TEST_MIGRATION_FREQ_MS 2
> -
> -struct test_args {
> - int nr_vcpus;
> - int nr_iter;
> - int timer_period_ms;
> - int migration_freq_ms;
> - struct kvm_arm_counter_offset offset;
> -};
> -
> -static struct test_args test_args = {
> - .nr_vcpus = NR_VCPUS_DEF,
> - .nr_iter = NR_TEST_ITERS_DEF,
> - .timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
> - .migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
> - .offset = { .reserved = 1 },
> -};
> -
> -#define msecs_to_usecs(msec) ((msec) * 1000LL)
> -
> #define GICD_BASE_GPA 0x8000000ULL
> #define GICR_BASE_GPA 0x80A0000ULL
>
> @@ -70,22 +25,8 @@ enum guest_stage {
> GUEST_STAGE_MAX,
> };
>
> -/* Shared variables between host and guest */
> -struct test_vcpu_shared_data {
> - int nr_iter;
> - enum guest_stage guest_stage;
> - uint64_t xcnt;
> -};
> -
> -static struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
> -static pthread_t pt_vcpu_run[KVM_MAX_VCPUS];
> -static struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
> -
> static int vtimer_irq, ptimer_irq;
>
> -static unsigned long *vcpu_done_map;
> -static pthread_mutex_t vcpu_done_map_lock;
> -
> static void
> guest_configure_timer_action(struct test_vcpu_shared_data *shared_data)
> {
> @@ -222,137 +163,6 @@ static void guest_code(void)
> GUEST_DONE();
> }
>
> -static void *test_vcpu_run(void *arg)
> -{
> - unsigned int vcpu_idx = (unsigned long)arg;
> - struct ucall uc;
> - struct kvm_vcpu *vcpu = vcpus[vcpu_idx];
> - struct kvm_vm *vm = vcpu->vm;
> - struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpu_idx];
> -
> - vcpu_run(vcpu);
> -
> - /* Currently, any exit from guest is an indication of completion */
> - pthread_mutex_lock(&vcpu_done_map_lock);
> - __set_bit(vcpu_idx, vcpu_done_map);
> - pthread_mutex_unlock(&vcpu_done_map_lock);
> -
> - switch (get_ucall(vcpu, &uc)) {
> - case UCALL_SYNC:
> - case UCALL_DONE:
> - break;
> - case UCALL_ABORT:
> - sync_global_from_guest(vm, *shared_data);
> - fprintf(stderr, "Guest assert failed, vcpu %u; stage; %u; iter: %u\n",
> - vcpu_idx, shared_data->guest_stage, shared_data->nr_iter);
> - REPORT_GUEST_ASSERT(uc);
> - break;
> - default:
> - TEST_FAIL("Unexpected guest exit\n");
> - }
> -
> - return NULL;
> -}
> -
> -static uint32_t test_get_pcpu(void)
> -{
> - uint32_t pcpu;
> - unsigned int nproc_conf;
> - cpu_set_t online_cpuset;
> -
> - nproc_conf = get_nprocs_conf();
> - sched_getaffinity(0, sizeof(cpu_set_t), &online_cpuset);
> -
> - /* Randomly find an available pCPU to place a vCPU on */
> - do {
> - pcpu = rand() % nproc_conf;
> - } while (!CPU_ISSET(pcpu, &online_cpuset));
> -
> - return pcpu;
> -}
> -
> -static int test_migrate_vcpu(unsigned int vcpu_idx)
> -{
> - int ret;
> - cpu_set_t cpuset;
> - uint32_t new_pcpu = test_get_pcpu();
> -
> - CPU_ZERO(&cpuset);
> - CPU_SET(new_pcpu, &cpuset);
> -
> - pr_debug("Migrating vCPU: %u to pCPU: %u\n", vcpu_idx, new_pcpu);
> -
> - ret = pthread_setaffinity_np(pt_vcpu_run[vcpu_idx],
> - sizeof(cpuset), &cpuset);
> -
> - /* Allow the error where the vCPU thread is already finished */
> - TEST_ASSERT(ret == 0 || ret == ESRCH,
> - "Failed to migrate the vCPU:%u to pCPU: %u; ret: %d\n",
> - vcpu_idx, new_pcpu, ret);
> -
> - return ret;
> -}
> -
> -static void *test_vcpu_migration(void *arg)
> -{
> - unsigned int i, n_done;
> - bool vcpu_done;
> -
> - do {
> - usleep(msecs_to_usecs(test_args.migration_freq_ms));
> -
> - for (n_done = 0, i = 0; i < test_args.nr_vcpus; i++) {
> - pthread_mutex_lock(&vcpu_done_map_lock);
> - vcpu_done = test_bit(i, vcpu_done_map);
> - pthread_mutex_unlock(&vcpu_done_map_lock);
> -
> - if (vcpu_done) {
> - n_done++;
> - continue;
> - }
> -
> - test_migrate_vcpu(i);
> - }
> - } while (test_args.nr_vcpus != n_done);
> -
> - return NULL;
> -}
> -
> -static void test_run(struct kvm_vm *vm)
> -{
> - pthread_t pt_vcpu_migration;
> - unsigned int i;
> - int ret;
> -
> - pthread_mutex_init(&vcpu_done_map_lock, NULL);
> - vcpu_done_map = bitmap_zalloc(test_args.nr_vcpus);
> - TEST_ASSERT(vcpu_done_map, "Failed to allocate vcpu done bitmap\n");
> -
> - for (i = 0; i < (unsigned long)test_args.nr_vcpus; i++) {
> - ret = pthread_create(&pt_vcpu_run[i], NULL, test_vcpu_run,
> - (void *)(unsigned long)i);
> - TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
> - }
> -
> - /* Spawn a thread to control the vCPU migrations */
> - if (test_args.migration_freq_ms) {
> - srand(time(NULL));
> -
> - ret = pthread_create(&pt_vcpu_migration, NULL,
> - test_vcpu_migration, NULL);
> - TEST_ASSERT(!ret, "Failed to create the migration pthread\n");
> - }
> -
> -
> - for (i = 0; i < test_args.nr_vcpus; i++)
> - pthread_join(pt_vcpu_run[i], NULL);
> -
> - if (test_args.migration_freq_ms)
> - pthread_join(pt_vcpu_migration, NULL);
> -
> - bitmap_free(vcpu_done_map);
> -}
> -
> static void test_init_timer_irq(struct kvm_vm *vm)
> {
> /* Timer initid should be same for all the vCPUs, so query only vCPU-0 */
> @@ -369,7 +179,7 @@ static void test_init_timer_irq(struct kvm_vm *vm)
>
> static int gic_fd;
>
> -static struct kvm_vm *test_vm_create(void)
> +struct kvm_vm *test_vm_create(void)
> {
> struct kvm_vm *vm;
> unsigned int i;
> @@ -400,81 +210,8 @@ static struct kvm_vm *test_vm_create(void)
> return vm;
> }
>
> -static void test_vm_cleanup(struct kvm_vm *vm)
> +void test_vm_cleanup(struct kvm_vm *vm)
> {
> close(gic_fd);
> kvm_vm_free(vm);
> }
> -
> -static void test_print_help(char *name)
> -{
> - pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
> - name);
> - pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
> - NR_VCPUS_DEF, KVM_MAX_VCPUS);
> - pr_info("\t-i: Number of iterations per stage (default: %u)\n",
> - NR_TEST_ITERS_DEF);
> - pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
> - TIMER_TEST_PERIOD_MS_DEF);
> - pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
> - TIMER_TEST_MIGRATION_FREQ_MS);
> - pr_info("\t-o: Counter offset (in counter cycles, default: 0)\n");
> - pr_info("\t-h: print this help screen\n");
> -}
> -
> -static bool parse_args(int argc, char *argv[])
> -{
> - int opt;
> -
> - while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
> - switch (opt) {
> - case 'n':
> - test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
> - if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
> - pr_info("Max allowed vCPUs: %u\n",
> - KVM_MAX_VCPUS);
> - goto err;
> - }
> - break;
> - case 'i':
> - test_args.nr_iter = atoi_positive("Number of iterations", optarg);
> - break;
> - case 'p':
> - test_args.timer_period_ms = atoi_positive("Periodicity", optarg);
> - break;
> - case 'm':
> - test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> - break;
> - case 'o':
> - test_args.offset.counter_offset = strtol(optarg, NULL, 0);
> - test_args.offset.reserved = 0;
> - break;
> - case 'h':
> - default:
> - goto err;
> - }
> - }
> -
> - return true;
> -
> -err:
> - test_print_help(argv[0]);
> - return false;
> -}
> -
> -int main(int argc, char *argv[])
> -{
> - struct kvm_vm *vm;
> -
> - if (!parse_args(argc, argv))
> - exit(KSFT_SKIP);
> -
> - __TEST_REQUIRE(!test_args.migration_freq_ms || get_nprocs() >= 2,
> - "At least two physical CPUs needed for vCPU migration");
> -
> - vm = test_vm_create();
> - test_run(vm);
> - test_vm_cleanup(vm);
> -
> - return 0;
> -}
> diff --git a/tools/testing/selftests/kvm/arch_timer.c b/tools/testing/selftests/kvm/arch_timer.c
> new file mode 100644
> index 000000000000..6e442dbcfc8b
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/arch_timer.c
> @@ -0,0 +1,249 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * arch_timer.c - Tests the arch timer IRQ functionality
> + *
> + * The guest's main thread configures the timer interrupt and waits
> + * for it to fire, with a timeout equal to the timer period.
> + * It asserts that the timeout doesn't exceed the timer period plus
> + * an error margin of 100us.
> + *
> + * On the other hand, upon receipt of an interrupt, the guest's interrupt
> + * handler validates the interrupt by checking if the architectural state
> + * is in compliance with the specifications.
> + *
> + * The test provides command-line options to configure the timer's
> + * period (-p), number of vCPUs (-n), and iterations per stage (-i).
> + * To stress-test the timer stack even more, an option to migrate the
> + * vCPUs across pCPUs (-m), at a particular rate, is also provided.
> + *
> + * Copyright (c) 2021, Google LLC.
> + */
> +
> +#define _GNU_SOURCE
> +
> +#include <stdlib.h>
> +#include <pthread.h>
> +#include <linux/sizes.h>
> +#include <linux/bitmap.h>
> +#include <sys/sysinfo.h>
> +
> +#include "timer_test.h"
> +
> +struct test_args test_args = {
> + .nr_vcpus = NR_VCPUS_DEF,
> + .nr_iter = NR_TEST_ITERS_DEF,
> + .timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
> + .migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
> + .offset = { .reserved = 1 },
> +};
> +
> +struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
> +struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
> +
> +static pthread_t pt_vcpu_run[KVM_MAX_VCPUS];
> +static unsigned long *vcpu_done_map;
> +static pthread_mutex_t vcpu_done_map_lock;
> +
> +static void *test_vcpu_run(void *arg)
> +{
> + unsigned int vcpu_idx = (unsigned long)arg;
> + struct ucall uc;
> + struct kvm_vcpu *vcpu = vcpus[vcpu_idx];
> + struct kvm_vm *vm = vcpu->vm;
> + struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpu_idx];
> +
> + vcpu_run(vcpu);
> +
> + /* Currently, any exit from guest is an indication of completion */
> + pthread_mutex_lock(&vcpu_done_map_lock);
> + __set_bit(vcpu_idx, vcpu_done_map);
> + pthread_mutex_unlock(&vcpu_done_map_lock);
> +
> + switch (get_ucall(vcpu, &uc)) {
> + case UCALL_SYNC:
> + case UCALL_DONE:
> + break;
> + case UCALL_ABORT:
> + sync_global_from_guest(vm, *shared_data);
> + fprintf(stderr, "Guest assert failed, vcpu %u; stage; %u; iter: %u\n",
> + vcpu_idx, shared_data->guest_stage, shared_data->nr_iter);
> + REPORT_GUEST_ASSERT(uc);
> + break;
> + default:
> + TEST_FAIL("Unexpected guest exit\n");
> + }
> +
> + return NULL;
> +}
> +
> +static uint32_t test_get_pcpu(void)
> +{
> + uint32_t pcpu;
> + unsigned int nproc_conf;
> + cpu_set_t online_cpuset;
> +
> + nproc_conf = get_nprocs_conf();
> + sched_getaffinity(0, sizeof(cpu_set_t), &online_cpuset);
> +
> + /* Randomly find an available pCPU to place a vCPU on */
> + do {
> + pcpu = rand() % nproc_conf;
> + } while (!CPU_ISSET(pcpu, &online_cpuset));
> +
> + return pcpu;
> +}
> +
> +static int test_migrate_vcpu(unsigned int vcpu_idx)
> +{
> + int ret;
> + cpu_set_t cpuset;
> + uint32_t new_pcpu = test_get_pcpu();
> +
> + CPU_ZERO(&cpuset);
> + CPU_SET(new_pcpu, &cpuset);
> +
> + pr_debug("Migrating vCPU: %u to pCPU: %u\n", vcpu_idx, new_pcpu);
> +
> + ret = pthread_setaffinity_np(pt_vcpu_run[vcpu_idx],
> + sizeof(cpuset), &cpuset);
> +
> + /* Allow the error where the vCPU thread is already finished */
> + TEST_ASSERT(ret == 0 || ret == ESRCH,
> + "Failed to migrate the vCPU:%u to pCPU: %u; ret: %d\n",
> + vcpu_idx, new_pcpu, ret);
> +
> + return ret;
> +}
> +
> +static void *test_vcpu_migration(void *arg)
> +{
> + unsigned int i, n_done;
> + bool vcpu_done;
> +
> + do {
> + usleep(msecs_to_usecs(test_args.migration_freq_ms));
> +
> + for (n_done = 0, i = 0; i < test_args.nr_vcpus; i++) {
> + pthread_mutex_lock(&vcpu_done_map_lock);
> + vcpu_done = test_bit(i, vcpu_done_map);
> + pthread_mutex_unlock(&vcpu_done_map_lock);
> +
> + if (vcpu_done) {
> + n_done++;
> + continue;
> + }
> +
> + test_migrate_vcpu(i);
> + }
> + } while (test_args.nr_vcpus != n_done);
> +
> + return NULL;
> +}
> +
> +static void test_run(struct kvm_vm *vm)
> +{
> + pthread_t pt_vcpu_migration;
> + unsigned int i;
> + int ret;
> +
> + pthread_mutex_init(&vcpu_done_map_lock, NULL);
> + vcpu_done_map = bitmap_zalloc(test_args.nr_vcpus);
> + TEST_ASSERT(vcpu_done_map, "Failed to allocate vcpu done bitmap\n");
> +
> + for (i = 0; i < (unsigned long)test_args.nr_vcpus; i++) {
> + ret = pthread_create(&pt_vcpu_run[i], NULL, test_vcpu_run,
> + (void *)(unsigned long)i);
> + TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
> + }
> +
> + /* Spawn a thread to control the vCPU migrations */
> + if (test_args.migration_freq_ms) {
> + srand(time(NULL));
> +
> + ret = pthread_create(&pt_vcpu_migration, NULL,
> + test_vcpu_migration, NULL);
> + TEST_ASSERT(!ret, "Failed to create the migration pthread\n");
> + }
> +
> +
> + for (i = 0; i < test_args.nr_vcpus; i++)
> + pthread_join(pt_vcpu_run[i], NULL);
> +
> + if (test_args.migration_freq_ms)
> + pthread_join(pt_vcpu_migration, NULL);
> +
> + bitmap_free(vcpu_done_map);
> +}
> +
> +static void test_print_help(char *name)
> +{
> + pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
> + name);
> + pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
> + NR_VCPUS_DEF, KVM_MAX_VCPUS);
> + pr_info("\t-i: Number of iterations per stage (default: %u)\n",
> + NR_TEST_ITERS_DEF);
> + pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
> + TIMER_TEST_PERIOD_MS_DEF);
> + pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
> + TIMER_TEST_MIGRATION_FREQ_MS);
> + pr_info("\t-o: Counter offset (in counter cycles, default: 0)\n");
> + pr_info("\t-h: print this help screen\n");
> +}
> +
> +static bool parse_args(int argc, char *argv[])
> +{
> + int opt;
> +
> + while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
> + switch (opt) {
> + case 'n':
> + test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
> + if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
> + pr_info("Max allowed vCPUs: %u\n",
> + KVM_MAX_VCPUS);
> + goto err;
> + }
> + break;
> + case 'i':
> + test_args.nr_iter = atoi_positive("Number of iterations", optarg);
> + break;
> + case 'p':
> + test_args.timer_period_ms = atoi_positive("Periodicity", optarg);
> + break;
> + case 'm':
> + test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> + break;
> + case 'o':
> + test_args.offset.counter_offset = strtol(optarg, NULL, 0);
> + test_args.offset.reserved = 0;
> + break;
> + case 'h':
> + default:
> + goto err;
> + }
> + }
> +
> + return true;
> +
> +err:
> + test_print_help(argv[0]);
> + return false;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + struct kvm_vm *vm;
> +
> + if (!parse_args(argc, argv))
> + exit(KSFT_SKIP);
> +
> + __TEST_REQUIRE(!test_args.migration_freq_ms || get_nprocs() >= 2,
> + "At least two physical CPUs needed for vCPU migration");
> +
> + vm = test_vm_create();
> + test_run(vm);
> + test_vm_cleanup(vm);
> +
> + return 0;
> +}
> diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
> index 8e5f413a593d..36387e7ee8b2 100644
> --- a/tools/testing/selftests/kvm/include/test_util.h
> +++ b/tools/testing/selftests/kvm/include/test_util.h
> @@ -20,6 +20,8 @@
> #include <sys/mman.h>
> #include "kselftest.h"
>
> +#define msecs_to_usecs(msec) ((msec) * 1000LL)
> +
> static inline int _no_printf(const char *format, ...) { return 0; }
>
> #ifdef DEBUG
> diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> new file mode 100644
> index 000000000000..2234c513b510
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/timer_test.h
> @@ -0,0 +1,43 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * timer test specific header
> + *
> + * Copyright (C) 2018, Google LLC
> + */
> +
> +#ifndef SELFTEST_KVM_TIMER_TEST_H
> +#define SELFTEST_KVM_TIMER_TEST_H
> +
> +#include "kvm_util.h"
> +
> +#define NR_VCPUS_DEF 4
> +#define NR_TEST_ITERS_DEF 5
> +#define TIMER_TEST_PERIOD_MS_DEF 10
> +#define TIMER_TEST_ERR_MARGIN_US 100
> +#define TIMER_TEST_MIGRATION_FREQ_MS 2
> +
> +/* Timer test cmdline parameters */
> +struct test_args {
> + int nr_vcpus;
> + int nr_iter;
> + int timer_period_ms;
> + int migration_freq_ms;
> + /* TODO: Change arm specific type to a common one */
> + struct kvm_arm_counter_offset offset;
> +};
> +
> +/* Shared variables between host and guest */
> +struct test_vcpu_shared_data {
> + int nr_iter;
> + int guest_stage;
> + uint64_t xcnt;
> +};
> +
> +extern struct test_args test_args;
> +extern struct kvm_vcpu *vcpus[];
> +extern struct test_vcpu_shared_data vcpu_shared_data[];
> +
> +struct kvm_vm *test_vm_create(void);
> +void test_vm_cleanup(struct kvm_vm *vm);
> +
> +#endif /* SELFTEST_KVM_TIMER_TEST_H */
> --
> 2.34.1
>