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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021, Google LLC.
*
* Tests for adjusting the system counter from userspace
*/
#include <asm/kvm_para.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"
#define VCPU_ID 0
#ifdef __x86_64__
struct test_case {
uint64_t tsc_offset;
};
static struct test_case test_cases[] = {
{ 0 },
{ 180 * NSEC_PER_SEC },
{ -180 * NSEC_PER_SEC },
};
static void check_preconditions(struct kvm_vm *vm)
{
if (!_vcpu_has_device_attr(vm, VCPU_ID, KVM_VCPU_TSC_CTRL, KVM_VCPU_TSC_OFFSET))
return;
print_skip("KVM_VCPU_TSC_OFFSET not supported; skipping test");
exit(KSFT_SKIP);
}
static void setup_system_counter(struct kvm_vm *vm, struct test_case *test)
{
vcpu_access_device_attr(vm, VCPU_ID, KVM_VCPU_TSC_CTRL,
KVM_VCPU_TSC_OFFSET, &test->tsc_offset, true);
}
static uint64_t guest_read_system_counter(struct test_case *test)
{
return rdtsc();
}
static uint64_t host_read_guest_system_counter(struct test_case *test)
{
return rdtsc() + test->tsc_offset;
}
#else /* __x86_64__ */
#error test not implemented for this architecture!
#endif
#define GUEST_SYNC_CLOCK(__stage, __val) \
GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0)
static void guest_main(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
struct test_case *test = &test_cases[i];
GUEST_SYNC_CLOCK(i, guest_read_system_counter(test));
}
}
static void handle_sync(struct ucall *uc, uint64_t start, uint64_t end)
{
uint64_t obs = uc->args[2];
TEST_ASSERT(start <= obs && obs <= end,
"unexpected system counter value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]",
obs, start, end);
pr_info("system counter value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n",
obs, start, end);
}
static void handle_abort(struct ucall *uc)
{
TEST_FAIL("%s at %s:%ld", (const char *)uc->args[0],
__FILE__, uc->args[1]);
}
static void enter_guest(struct kvm_vm *vm)
{
uint64_t start, end;
struct ucall uc;
int i;
for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
struct test_case *test = &test_cases[i];
setup_system_counter(vm, test);
start = host_read_guest_system_counter(test);
vcpu_run(vm, VCPU_ID);
end = host_read_guest_system_counter(test);
switch (get_ucall(vm, VCPU_ID, &uc)) {
case UCALL_SYNC:
handle_sync(&uc, start, end);
break;
case UCALL_ABORT:
handle_abort(&uc);
return;
default:
TEST_ASSERT(0, "unhandled ucall %ld\n",
get_ucall(vm, VCPU_ID, &uc));
}
}
}
int main(void)
{
struct kvm_vm *vm;
vm = vm_create_default(VCPU_ID, 0, guest_main);
check_preconditions(vm);
ucall_init(vm, NULL);
enter_guest(vm);
kvm_vm_free(vm);
}
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