128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2021, Google LLC.
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*
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* Tests for adjusting the system counter from userspace
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*/
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#include <asm/kvm_para.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <time.h>
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#include "test_util.h"
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#include "kvm_util.h"
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#include "processor.h"
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#ifdef __x86_64__
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struct test_case {
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uint64_t tsc_offset;
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};
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static struct test_case test_cases[] = {
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{ 0 },
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{ 180 * NSEC_PER_SEC },
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{ -180 * NSEC_PER_SEC },
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};
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static void check_preconditions(struct kvm_vcpu *vcpu)
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{
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__TEST_REQUIRE(!__vcpu_has_device_attr(vcpu, KVM_VCPU_TSC_CTRL,
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KVM_VCPU_TSC_OFFSET),
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"KVM_VCPU_TSC_OFFSET not supported; skipping test");
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}
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static void setup_system_counter(struct kvm_vcpu *vcpu, struct test_case *test)
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{
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vcpu_device_attr_set(vcpu, KVM_VCPU_TSC_CTRL, KVM_VCPU_TSC_OFFSET,
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&test->tsc_offset);
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}
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static uint64_t guest_read_system_counter(struct test_case *test)
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{
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return rdtsc();
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}
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static uint64_t host_read_guest_system_counter(struct test_case *test)
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{
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return rdtsc() + test->tsc_offset;
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}
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#else /* __x86_64__ */
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#error test not implemented for this architecture!
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#endif
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#define GUEST_SYNC_CLOCK(__stage, __val) \
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GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0)
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static void guest_main(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
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struct test_case *test = &test_cases[i];
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GUEST_SYNC_CLOCK(i, guest_read_system_counter(test));
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}
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}
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static void handle_sync(struct ucall *uc, uint64_t start, uint64_t end)
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{
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uint64_t obs = uc->args[2];
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TEST_ASSERT(start <= obs && obs <= end,
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"unexpected system counter value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]",
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obs, start, end);
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pr_info("system counter value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n",
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obs, start, end);
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}
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static void handle_abort(struct ucall *uc)
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{
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REPORT_GUEST_ASSERT(*uc);
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}
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static void enter_guest(struct kvm_vcpu *vcpu)
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{
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uint64_t start, end;
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struct ucall uc;
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int i;
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for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
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struct test_case *test = &test_cases[i];
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setup_system_counter(vcpu, test);
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start = host_read_guest_system_counter(test);
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vcpu_run(vcpu);
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end = host_read_guest_system_counter(test);
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switch (get_ucall(vcpu, &uc)) {
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case UCALL_SYNC:
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handle_sync(&uc, start, end);
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break;
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case UCALL_ABORT:
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handle_abort(&uc);
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return;
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default:
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TEST_ASSERT(0, "unhandled ucall %ld\n",
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get_ucall(vcpu, &uc));
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}
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}
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}
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int main(void)
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{
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struct kvm_vcpu *vcpu;
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struct kvm_vm *vm;
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vm = vm_create_with_one_vcpu(&vcpu, guest_main);
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check_preconditions(vcpu);
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enter_guest(vcpu);
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kvm_vm_free(vm);
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}
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