Add a little perf tester for interrupts that go to guest, host, and
userspace.
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
tools/testing/selftests/kvm/Makefile | 1 +
.../selftests/kvm/powerpc/interrupt_perf.c | 199 ++++++++++++++++++
2 files changed, 200 insertions(+)
create mode 100644 tools/testing/selftests/kvm/powerpc/interrupt_perf.c
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index aa3a8ca676c2..834f98971b0c 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -184,6 +184,7 @@ TEST_GEN_PROGS_riscv += kvm_page_table_test
TEST_GEN_PROGS_riscv += set_memory_region_test
TEST_GEN_PROGS_riscv += kvm_binary_stats_test
+TEST_GEN_PROGS_powerpc += powerpc/interrupt_perf
TEST_GEN_PROGS_powerpc += powerpc/null_test
TEST_GEN_PROGS_powerpc += powerpc/rtas_hcall
TEST_GEN_PROGS_powerpc += powerpc/tlbiel_test
diff --git a/tools/testing/selftests/kvm/powerpc/interrupt_perf.c b/tools/testing/selftests/kvm/powerpc/interrupt_perf.c
new file mode 100644
index 000000000000..50d078899e22
--- /dev/null
+++ b/tools/testing/selftests/kvm/powerpc/interrupt_perf.c
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Test basic guest interrupt/exit performance.
+ */
+
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sched.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/sysinfo.h>
+#include <signal.h>
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "kselftest.h"
+#include "processor.h"
+#include "helpers.h"
+#include "hcall.h"
+
+static bool timeout;
+static unsigned long count;
+static struct kvm_vm *kvm_vm;
+
+static void set_timer(int sec)
+{
+ struct itimerval timer;
+
+ timeout = false;
+
+ timer.it_value.tv_sec = sec;
+ timer.it_value.tv_usec = 0;
+ timer.it_interval = timer.it_value;
+ TEST_ASSERT(setitimer(ITIMER_REAL, &timer, NULL) == 0,
+ "setitimer failed %s", strerror(errno));
+}
+
+static void sigalrm_handler(int sig)
+{
+ timeout = true;
+ sync_global_to_guest(kvm_vm, timeout);
+}
+
+static void init_timers(void)
+{
+ TEST_ASSERT(signal(SIGALRM, sigalrm_handler) != SIG_ERR,
+ "Failed to register SIGALRM handler, errno = %d (%s)",
+ errno, strerror(errno));
+}
+
+static void program_interrupt_handler(struct ex_regs *regs)
+{
+ regs->nia += 4;
+}
+
+static void program_interrupt_guest_code(void)
+{
+ unsigned long nr = 0;
+
+ while (!timeout) {
+ asm volatile("trap");
+ nr++;
+ barrier();
+ }
+ count = nr;
+
+ GUEST_DONE();
+}
+
+static void program_interrupt_test(void)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+
+ /* Create VM */
+ vm = vm_create_with_one_vcpu(&vcpu, program_interrupt_guest_code);
+ kvm_vm = vm;
+ vm_install_exception_handler(vm, 0x700, program_interrupt_handler);
+
+ set_timer(1);
+
+ while (!timeout) {
+ vcpu_run(vcpu);
+ barrier();
+ }
+
+ sync_global_from_guest(vm, count);
+
+ kvm_vm = NULL;
+ vm_install_exception_handler(vm, 0x700, NULL);
+
+ kvm_vm_free(vm);
+
+ printf("%lu guest interrupts per second\n", count);
+ count = 0;
+}
+
+static void heai_guest_code(void)
+{
+ unsigned long nr = 0;
+
+ while (!timeout) {
+ asm volatile(".long 0");
+ nr++;
+ barrier();
+ }
+ count = nr;
+
+ GUEST_DONE();
+}
+
+static void heai_test(void)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+
+ /* Create VM */
+ vm = vm_create_with_one_vcpu(&vcpu, heai_guest_code);
+ kvm_vm = vm;
+ vm_install_exception_handler(vm, 0x700, program_interrupt_handler);
+
+ set_timer(1);
+
+ while (!timeout) {
+ vcpu_run(vcpu);
+ barrier();
+ }
+
+ sync_global_from_guest(vm, count);
+
+ kvm_vm = NULL;
+ vm_install_exception_handler(vm, 0x700, NULL);
+
+ kvm_vm_free(vm);
+
+ printf("%lu guest exits per second\n", count);
+ count = 0;
+}
+
+static void hcall_guest_code(void)
+{
+ for (;;)
+ hcall0(H_RTAS);
+}
+
+static void hcall_test(void)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+
+ /* Create VM */
+ vm = vm_create_with_one_vcpu(&vcpu, hcall_guest_code);
+ kvm_vm = vm;
+
+ set_timer(1);
+
+ while (!timeout) {
+ vcpu_run(vcpu);
+ count++;
+ barrier();
+ }
+
+ kvm_vm = NULL;
+
+ kvm_vm_free(vm);
+
+ printf("%lu KVM exits per second\n", count);
+ count = 0;
+}
+
+struct testdef {
+ const char *name;
+ void (*test)(void);
+} testlist[] = {
+ { "guest interrupt test", program_interrupt_test},
+ { "guest exit test", heai_test},
+ { "KVM exit test", hcall_test},
+};
+
+int main(int argc, char *argv[])
+{
+ int idx;
+
+ ksft_print_header();
+
+ ksft_set_plan(ARRAY_SIZE(testlist));
+
+ init_timers();
+
+ for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) {
+ testlist[idx].test();
+ ksft_test_result_pass("%s\n", testlist[idx].name);
+ }
+
+ ksft_finished(); /* Print results and exit() accordingly */
+}
--
2.40.1
