115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* svm_vmcall_test
|
||
|
|
*
|
||
|
|
* Copyright © 2021 Amazon.com, Inc. or its affiliates.
|
||
|
|
*
|
||
|
|
* Xen shared_info / pvclock testing
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "test_util.h"
|
||
|
|
#include "kvm_util.h"
|
||
|
|
#include "processor.h"
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <sched.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <pthread.h>
|
||
|
|
|
||
|
|
#define NR_TEST_VCPUS 20
|
||
|
|
|
||
|
|
static struct kvm_vm *vm;
|
||
|
|
pthread_spinlock_t create_lock;
|
||
|
|
|
||
|
|
#define TEST_TSC_KHZ 2345678UL
|
||
|
|
#define TEST_TSC_OFFSET 200000000
|
||
|
|
|
||
|
|
uint64_t tsc_sync;
|
||
|
|
static void guest_code(void)
|
||
|
|
{
|
||
|
|
uint64_t start_tsc, local_tsc, tmp;
|
||
|
|
|
||
|
|
start_tsc = rdtsc();
|
||
|
|
do {
|
||
|
|
tmp = READ_ONCE(tsc_sync);
|
||
|
|
local_tsc = rdtsc();
|
||
|
|
WRITE_ONCE(tsc_sync, local_tsc);
|
||
|
|
if (unlikely(local_tsc < tmp))
|
||
|
|
GUEST_SYNC_ARGS(0, local_tsc, tmp, 0, 0);
|
||
|
|
|
||
|
|
} while (local_tsc - start_tsc < 5000 * TEST_TSC_KHZ);
|
||
|
|
|
||
|
|
GUEST_DONE();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void *run_vcpu(void *_cpu_nr)
|
||
|
|
{
|
||
|
|
unsigned long vcpu_id = (unsigned long)_cpu_nr;
|
||
|
|
unsigned long failures = 0;
|
||
|
|
static bool first_cpu_done;
|
||
|
|
struct kvm_vcpu *vcpu;
|
||
|
|
|
||
|
|
/* The kernel is fine, but vm_vcpu_add() needs locking */
|
||
|
|
pthread_spin_lock(&create_lock);
|
||
|
|
|
||
|
|
vcpu = vm_vcpu_add(vm, vcpu_id, guest_code);
|
||
|
|
|
||
|
|
if (!first_cpu_done) {
|
||
|
|
first_cpu_done = true;
|
||
|
|
vcpu_set_msr(vcpu, MSR_IA32_TSC, TEST_TSC_OFFSET);
|
||
|
|
}
|
||
|
|
|
||
|
|
pthread_spin_unlock(&create_lock);
|
||
|
|
|
||
|
|
for (;;) {
|
||
|
|
struct ucall uc;
|
||
|
|
|
||
|
|
vcpu_run(vcpu);
|
||
|
|
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
|
||
|
|
|
||
|
|
switch (get_ucall(vcpu, &uc)) {
|
||
|
|
case UCALL_DONE:
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
case UCALL_SYNC:
|
||
|
|
printf("Guest %d sync %lx %lx %ld\n", vcpu->id,
|
||
|
|
uc.args[2], uc.args[3], uc.args[2] - uc.args[3]);
|
||
|
|
failures++;
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
TEST_FAIL("Unknown ucall %lu", uc.cmd);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return (void *)failures;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
TEST_REQUIRE(kvm_has_cap(KVM_CAP_VM_TSC_CONTROL));
|
||
|
|
|
||
|
|
vm = vm_create(NR_TEST_VCPUS);
|
||
|
|
vm_ioctl(vm, KVM_SET_TSC_KHZ, (void *) TEST_TSC_KHZ);
|
||
|
|
|
||
|
|
pthread_spin_init(&create_lock, PTHREAD_PROCESS_PRIVATE);
|
||
|
|
pthread_t cpu_threads[NR_TEST_VCPUS];
|
||
|
|
unsigned long cpu;
|
||
|
|
for (cpu = 0; cpu < NR_TEST_VCPUS; cpu++)
|
||
|
|
pthread_create(&cpu_threads[cpu], NULL, run_vcpu, (void *)cpu);
|
||
|
|
|
||
|
|
unsigned long failures = 0;
|
||
|
|
for (cpu = 0; cpu < NR_TEST_VCPUS; cpu++) {
|
||
|
|
void *this_cpu_failures;
|
||
|
|
pthread_join(cpu_threads[cpu], &this_cpu_failures);
|
||
|
|
failures += (unsigned long)this_cpu_failures;
|
||
|
|
}
|
||
|
|
|
||
|
|
TEST_ASSERT(!failures, "TSC sync failed");
|
||
|
|
pthread_spin_destroy(&create_lock);
|
||
|
|
kvm_vm_free(vm);
|
||
|
|
return 0;
|
||
|
|
}
|