[linux-2.6-block.git] / tools / testing / selftests / kvm / x86_64 / kvm_clock_test.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2021, Google LLC.
 *
 * Tests for adjusting the KVM clock from userspace
 */
#include <asm/kvm_para.h>
#include <asm/pvclock.h>
#include <asm/pvclock-abi.h>
#include <stdint.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>

#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"

struct test_case {
	uint64_t kvmclock_base;
	int64_t realtime_offset;
};

static struct test_case test_cases[] = {
	{ .kvmclock_base = 0 },
	{ .kvmclock_base = 180 * NSEC_PER_SEC },
	{ .kvmclock_base = 0, .realtime_offset = -180 * NSEC_PER_SEC },
	{ .kvmclock_base = 0, .realtime_offset = 180 * NSEC_PER_SEC },
};

#define GUEST_SYNC_CLOCK(__stage, __val)			\
		GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0)

static void guest_main(vm_paddr_t pvti_pa, struct pvclock_vcpu_time_info *pvti)
{
	int i;

	wrmsr(MSR_KVM_SYSTEM_TIME_NEW, pvti_pa | KVM_MSR_ENABLED);
	for (i = 0; i < ARRAY_SIZE(test_cases); i++)
		GUEST_SYNC_CLOCK(i, __pvclock_read_cycles(pvti, rdtsc()));
}

#define EXPECTED_FLAGS (KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC)

static inline void assert_flags(struct kvm_clock_data *data)
{
	TEST_ASSERT((data->flags & EXPECTED_FLAGS) == EXPECTED_FLAGS,
		    "unexpected clock data flags: %x (want set: %x)",
		    data->flags, EXPECTED_FLAGS);
}

static void handle_sync(struct ucall *uc, struct kvm_clock_data *start,
			struct kvm_clock_data *end)
{
	uint64_t obs, exp_lo, exp_hi;

	obs = uc->args[2];
	exp_lo = start->clock;
	exp_hi = end->clock;

	assert_flags(start);
	assert_flags(end);

	TEST_ASSERT(exp_lo <= obs && obs <= exp_hi,
		    "unexpected kvm-clock value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]",
		    obs, exp_lo, exp_hi);

	pr_info("kvm-clock value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n",
		obs, exp_lo, exp_hi);
}

static void handle_abort(struct ucall *uc)
{
	REPORT_GUEST_ASSERT(*uc);
}

static void setup_clock(struct kvm_vm *vm, struct test_case *test_case)
{
	struct kvm_clock_data data;

	memset(&data, 0, sizeof(data));

	data.clock = test_case->kvmclock_base;
	if (test_case->realtime_offset) {
		struct timespec ts;
		int r;

		data.flags |= KVM_CLOCK_REALTIME;
		do {
			r = clock_gettime(CLOCK_REALTIME, &ts);
			if (!r)
				break;
		} while (errno == EINTR);

		TEST_ASSERT(!r, "clock_gettime() failed: %d", r);

		data.realtime = ts.tv_sec * NSEC_PER_SEC;
		data.realtime += ts.tv_nsec;
		data.realtime += test_case->realtime_offset;
	}

	vm_ioctl(vm, KVM_SET_CLOCK, &data);
}

static void enter_guest(struct kvm_vcpu *vcpu)
{
	struct kvm_clock_data start, end;
	struct kvm_vm *vm = vcpu->vm;
	struct ucall uc;
	int i;

	for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
		setup_clock(vm, &test_cases[i]);

		vm_ioctl(vm, KVM_GET_CLOCK, &start);

		vcpu_run(vcpu);
		vm_ioctl(vm, KVM_GET_CLOCK, &end);

		TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);

		switch (get_ucall(vcpu, &uc)) {
		case UCALL_SYNC:
			handle_sync(&uc, &start, &end);
			break;
		case UCALL_ABORT:
			handle_abort(&uc);
			return;
		default:
			TEST_ASSERT(0, "unhandled ucall: %ld", uc.cmd);
		}
	}
}

int main(void)
{
	struct kvm_vcpu *vcpu;
	vm_vaddr_t pvti_gva;
	vm_paddr_t pvti_gpa;
	struct kvm_vm *vm;
	int flags;

	flags = kvm_check_cap(KVM_CAP_ADJUST_CLOCK);
	TEST_REQUIRE(flags & KVM_CLOCK_REALTIME);

	TEST_REQUIRE(sys_clocksource_is_based_on_tsc());

	vm = vm_create_with_one_vcpu(&vcpu, guest_main);

	pvti_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000);
	pvti_gpa = addr_gva2gpa(vm, pvti_gva);
	vcpu_args_set(vcpu, 2, pvti_gpa, pvti_gva);

	enter_guest(vcpu);
	kvm_vm_free(vm);
}
Commit	Line	Data
61fb1c54 OU	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* Copyright (C) 2021, Google LLC.
	4	*
	5	* Tests for adjusting the KVM clock from userspace
	6	*/
	7	#include <asm/kvm_para.h>
	8	#include <asm/pvclock.h>
	9	#include <asm/pvclock-abi.h>
	10	#include <stdint.h>
	11	#include <string.h>
	12	#include <sys/stat.h>
	13	#include <time.h>
	14
	15	#include "test_util.h"
	16	#include "kvm_util.h"
	17	#include "processor.h"
	18
61fb1c54 OU	19	struct test_case {
	20	uint64_t kvmclock_base;
	21	int64_t realtime_offset;
	22	};
	23
	24	static struct test_case test_cases[] = {
	25	{ .kvmclock_base = 0 },
	26	{ .kvmclock_base = 180 * NSEC_PER_SEC },
	27	{ .kvmclock_base = 0, .realtime_offset = -180 * NSEC_PER_SEC },
	28	{ .kvmclock_base = 0, .realtime_offset = 180 * NSEC_PER_SEC },
	29	};
	30
	31	#define GUEST_SYNC_CLOCK(__stage, __val) \
	32	GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0)
	33
	34	static void guest_main(vm_paddr_t pvti_pa, struct pvclock_vcpu_time_info *pvti)
	35	{
	36	int i;
	37
	38	wrmsr(MSR_KVM_SYSTEM_TIME_NEW, pvti_pa \| KVM_MSR_ENABLED);
	39	for (i = 0; i < ARRAY_SIZE(test_cases); i++)
	40	GUEST_SYNC_CLOCK(i, __pvclock_read_cycles(pvti, rdtsc()));
	41	}
	42
	43	#define EXPECTED_FLAGS (KVM_CLOCK_REALTIME \| KVM_CLOCK_HOST_TSC)
	44
	45	static inline void assert_flags(struct kvm_clock_data *data)
	46	{
	47	TEST_ASSERT((data->flags & EXPECTED_FLAGS) == EXPECTED_FLAGS,
	48	"unexpected clock data flags: %x (want set: %x)",
	49	data->flags, EXPECTED_FLAGS);
	50	}
	51
	52	static void handle_sync(struct ucall uc, struct kvm_clock_data start,
	53	struct kvm_clock_data *end)
	54	{
	55	uint64_t obs, exp_lo, exp_hi;
	56
	57	obs = uc->args[2];
	58	exp_lo = start->clock;
	59	exp_hi = end->clock;
	60
	61	assert_flags(start);
	62	assert_flags(end);
	63
	64	TEST_ASSERT(exp_lo <= obs && obs <= exp_hi,
	65	"unexpected kvm-clock value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]",
	66	obs, exp_lo, exp_hi);
	67
	68	pr_info("kvm-clock value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n",
	69	obs, exp_lo, exp_hi);
	70	}
	71
	72	static void handle_abort(struct ucall *uc)
	73	{
594a1c27	74	REPORT_GUEST_ASSERT(*uc);
61fb1c54 OU	75	}
	76
	77	static void setup_clock(struct kvm_vm vm, struct test_case test_case)
	78	{
	79	struct kvm_clock_data data;
	80
	81	memset(&data, 0, sizeof(data));
	82
	83	data.clock = test_case->kvmclock_base;
	84	if (test_case->realtime_offset) {
	85	struct timespec ts;
	86	int r;
	87
	88	data.flags \|= KVM_CLOCK_REALTIME;
	89	do {
	90	r = clock_gettime(CLOCK_REALTIME, &ts);
	91	if (!r)
	92	break;
	93	} while (errno == EINTR);
	94
65612e99	95	TEST_ASSERT(!r, "clock_gettime() failed: %d", r);
61fb1c54 OU	96
	97	data.realtime = ts.tv_sec * NSEC_PER_SEC;
	98	data.realtime += ts.tv_nsec;
	99	data.realtime += test_case->realtime_offset;
	100	}
	101
	102	vm_ioctl(vm, KVM_SET_CLOCK, &data);
	103	}
	104
5e7cb715	105	static void enter_guest(struct kvm_vcpu *vcpu)
61fb1c54 OU	106	{
61fb1c54 OU	107	struct kvm_clock_data start, end;
5e7cb715	108	struct kvm_vm *vm = vcpu->vm;
61fb1c54	109	struct ucall uc;
5e7cb715	110	int i;
61fb1c54 OU	111
	112	for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
	113	setup_clock(vm, &test_cases[i]);
	114
	115	vm_ioctl(vm, KVM_GET_CLOCK, &start);
	116
768e9a61	117	vcpu_run(vcpu);
61fb1c54 OU	118	vm_ioctl(vm, KVM_GET_CLOCK, &end);
61fb1c54 OU	119
c96f57b0	120	TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
61fb1c54	121
768e9a61	122	switch (get_ucall(vcpu, &uc)) {
61fb1c54 OU	123	case UCALL_SYNC:
	124	handle_sync(&uc, &start, &end);
	125	break;
	126	case UCALL_ABORT:
	127	handle_abort(&uc);
	128	return;
	129	default:
65612e99	130	TEST_ASSERT(0, "unhandled ucall: %ld", uc.cmd);
61fb1c54 OU	131	}
	132	}
	133	}
	134
61fb1c54 OU	135	int main(void)
61fb1c54 OU	136	{
5e7cb715	137	struct kvm_vcpu *vcpu;
61fb1c54 OU	138	vm_vaddr_t pvti_gva;
	139	vm_paddr_t pvti_gpa;
	140	struct kvm_vm *vm;
	141	int flags;
	142
	143	flags = kvm_check_cap(KVM_CAP_ADJUST_CLOCK);
7ed397d1	144	TEST_REQUIRE(flags & KVM_CLOCK_REALTIME);
61fb1c54	145
09951bf2	146	TEST_REQUIRE(sys_clocksource_is_based_on_tsc());
61fb1c54	147
5e7cb715	148	vm = vm_create_with_one_vcpu(&vcpu, guest_main);
61fb1c54 OU	149
	150	pvti_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000);
	151	pvti_gpa = addr_gva2gpa(vm, pvti_gva);
768e9a61	152	vcpu_args_set(vcpu, 2, pvti_gpa, pvti_gva);
61fb1c54	153
5e7cb715	154	enter_guest(vcpu);
61fb1c54 OU	155	kvm_vm_free(vm);
61fb1c54 OU	156	}