1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2021, Google LLC.
5 * Tests for adjusting the system counter from userspace
7 #include <asm/kvm_para.h>
13 #include "test_util.h"
15 #include "processor.h"
23 static struct test_case test_cases[] = {
25 { 180 * NSEC_PER_SEC },
26 { -180 * NSEC_PER_SEC },
29 static void check_preconditions(struct kvm_vcpu *vcpu)
31 __TEST_REQUIRE(!__vcpu_has_device_attr(vcpu, KVM_VCPU_TSC_CTRL,
33 "KVM_VCPU_TSC_OFFSET not supported; skipping test");
36 static void setup_system_counter(struct kvm_vcpu *vcpu, struct test_case *test)
38 vcpu_device_attr_set(vcpu, KVM_VCPU_TSC_CTRL, KVM_VCPU_TSC_OFFSET,
42 static uint64_t guest_read_system_counter(struct test_case *test)
47 static uint64_t host_read_guest_system_counter(struct test_case *test)
49 return rdtsc() + test->tsc_offset;
52 #else /* __x86_64__ */
54 #error test not implemented for this architecture!
58 #define GUEST_SYNC_CLOCK(__stage, __val) \
59 GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0)
61 static void guest_main(void)
65 for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
66 struct test_case *test = &test_cases[i];
68 GUEST_SYNC_CLOCK(i, guest_read_system_counter(test));
72 static void handle_sync(struct ucall *uc, uint64_t start, uint64_t end)
74 uint64_t obs = uc->args[2];
76 TEST_ASSERT(start <= obs && obs <= end,
77 "unexpected system counter value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]",
80 pr_info("system counter value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n",
84 static void handle_abort(struct ucall *uc)
86 REPORT_GUEST_ASSERT(*uc);
89 static void enter_guest(struct kvm_vcpu *vcpu)
95 for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
96 struct test_case *test = &test_cases[i];
98 setup_system_counter(vcpu, test);
99 start = host_read_guest_system_counter(test);
101 end = host_read_guest_system_counter(test);
103 switch (get_ucall(vcpu, &uc)) {
105 handle_sync(&uc, start, end);
111 TEST_ASSERT(0, "unhandled ucall %ld\n",
112 get_ucall(vcpu, &uc));
119 struct kvm_vcpu *vcpu;
122 vm = vm_create_with_one_vcpu(&vcpu, guest_main);
123 check_preconditions(vcpu);