// SPDX-License-Identifier: GPL-2.0-only
#include <linux/kvm.h>
#include <linux/psp-sev.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <errno.h>
#include <pthread.h>
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "sev.h"
#include "kselftest.h"
#define NR_MIGRATE_TEST_VCPUS 4
#define NR_MIGRATE_TEST_VMS 3
#define NR_LOCK_TESTING_THREADS 3
#define NR_LOCK_TESTING_ITERATIONS 10000
bool have_sev_es;
static struct kvm_vm *sev_vm_create(bool es)
{
struct kvm_vm *vm;
int i;
vm = vm_create_barebones();
if (!es)
sev_vm_init(vm);
else
sev_es_vm_init(vm);
for (i = 0; i < NR_MIGRATE_TEST_VCPUS; ++i)
__vm_vcpu_add(vm, i);
sev_vm_launch(vm, es ? SEV_POLICY_ES : 0);
if (es)
vm_sev_ioctl(vm, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL);
return vm;
}
static struct kvm_vm *aux_vm_create(bool with_vcpus)
{
struct kvm_vm *vm;
int i;
vm = vm_create_barebones();
if (!with_vcpus)
return vm;
for (i = 0; i < NR_MIGRATE_TEST_VCPUS; ++i)
__vm_vcpu_add(vm, i);
return vm;
}
static int __sev_migrate_from(struct kvm_vm *dst, struct kvm_vm *src)
{
return __vm_enable_cap(dst, KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM, src->fd);
}
static void sev_migrate_from(struct kvm_vm *dst, struct kvm_vm *src)
{
int ret;
ret = __sev_migrate_from(dst, src);
TEST_ASSERT(!ret, "Migration failed, ret: %d, errno: %d", ret, errno);
}
static void test_sev_migrate_from(bool es)
{
struct kvm_vm *src_vm;
struct kvm_vm *dst_vms[NR_MIGRATE_TEST_VMS];
int i, ret;
src_vm = sev_vm_create(es);
for (i = 0; i < NR_MIGRATE_TEST_VMS; ++i)
dst_vms[i] = aux_vm_create(true);
/* Initial migration from the src to the first dst. */
sev_migrate_from(dst_vms[0], src_vm);
for (i = 1; i < NR_MIGRATE_TEST_VMS; i++)
sev_migrate_from(dst_vms[i], dst_vms[i - 1]);
/* Migrate the guest back to the original VM. */
ret = __sev_migrate_from(src_vm, dst_vms[NR_MIGRATE_TEST_VMS - 1]);
TEST_ASSERT(ret == -1 && errno == EIO,
"VM that was migrated from should be dead. ret %d, errno: %d", ret,
errno);
kvm_vm_free(src_vm);
for (i = 0; i < NR_MIGRATE_TEST_VMS; ++i)
kvm_vm_free(dst_vms[i]);
}
struct locking_thread_input {
struct kvm_vm *vm;
struct kvm_vm *source_vms[NR_LOCK_TESTING_THREADS];
};
static void *locking_test_thread(void *arg)
{
int i, j;
struct locking_thread_input *input = (struct locking_thread_input *)arg;
for (i = 0; i < NR_LOCK_TESTING_ITERATIONS; ++i) {
j = i % NR_LOCK_TESTING_THREADS;
__sev_migrate_from(input->vm, input->source_vms[j]);
}
return NULL;
}
static void test_sev_migrate_locking(void)
{
struct locking_thread_input input[NR_LOCK_TESTING_THREADS];
pthread_t pt[NR_LOCK_TESTING_THREADS];
int i;
for (i = 0; i < NR_LOCK_TESTING_THREADS; ++i) {
input[i].vm = sev_vm_create(/* es= */ false);
input[0].source_vms[i] = input[i].vm;
}
for (i = 1; i < NR_LOCK_TESTING_THREADS; ++i)
memcpy(input[i].source_vms, input[0].source_vms,
sizeof(input[i].source_vms));
for (i = 0; i < NR_LOCK_TESTING_THREADS; ++i)
pthread_create(&pt[i], NULL, locking_test_thread, &input[i]);
for (i = 0; i < NR_LOCK_TESTING_THREADS; ++i)
pthread_join(pt[i], NULL);
for (i = 0; i < NR_LOCK_TESTING_THREADS; ++i)
kvm_vm_free(input[i].vm);
}
static void test_sev_migrate_parameters(void)
{
struct kvm_vm *sev_vm, *sev_es_vm, *vm_no_vcpu, *vm_no_sev,
*sev_es_vm_no_vmsa;
int ret;
vm_no_vcpu = vm_create_barebones();
vm_no_sev = aux_vm_create(true);
ret = __sev_migrate_from(vm_no_vcpu, vm_no_sev);
TEST_ASSERT(ret == -1 && errno == EINVAL,
"Migrations require SEV enabled. ret %d, errno: %d", ret,
errno);
if (!have_sev_es)
goto out;
sev_vm = sev_vm_create(/* es= */ false);
sev_es_vm = sev_vm_create(/* es= */ true);
sev_es_vm_no_vmsa = vm_create_barebones();
sev_es_vm_init(sev_es_vm_no_vmsa);
__vm_vcpu_add(sev_es_vm_no_vmsa, 1);
ret = __sev_migrate_from(sev_vm, sev_es_vm);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"Should not be able migrate to SEV enabled VM. ret: %d, errno: %d",
ret, errno);
ret = __sev_migrate_from(sev_es_vm, sev_vm);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"Should not be able migrate to SEV-ES enabled VM. ret: %d, errno: %d",
ret, errno);
ret = __sev_migrate_from(vm_no_vcpu, sev_es_vm);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"SEV-ES migrations require same number of vCPUS. ret: %d, errno: %d",
ret, errno);
ret = __sev_migrate_from(vm_no_vcpu, sev_es_vm_no_vmsa);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"SEV-ES migrations require UPDATE_VMSA. ret %d, errno: %d",
ret, errno);
kvm_vm_free(sev_vm);
kvm_vm_free(sev_es_vm);
kvm_vm_free(sev_es_vm_no_vmsa);
out:
kvm_vm_free(vm_no_vcpu);
kvm_vm_free(vm_no_sev);
}
static int __sev_mirror_create(struct kvm_vm *dst, struct kvm_vm *src)
{
return __vm_enable_cap(dst, KVM_CAP_VM_COPY_ENC_CONTEXT_FROM, src->fd);
}
static void sev_mirror_create(struct kvm_vm *dst, struct kvm_vm *src)
{
int ret;
ret = __sev_mirror_create(dst, src);
TEST_ASSERT(!ret, "Copying context failed, ret: %d, errno: %d", ret, errno);
}
static void verify_mirror_allowed_cmds(struct kvm_vm *vm)
{
struct kvm_sev_guest_status status;
int cmd_id;
for (cmd_id = KVM_SEV_INIT; cmd_id < KVM_SEV_NR_MAX; ++cmd_id) {
int ret;
/*
* These commands are allowed for mirror VMs, all others are
* not.
*/
switch (cmd_id) {
case KVM_SEV_LAUNCH_UPDATE_VMSA:
case KVM_SEV_GUEST_STATUS:
case KVM_SEV_DBG_DECRYPT:
case KVM_SEV_DBG_ENCRYPT:
continue;
default:
break;
}
/*
* These commands should be disallowed before the data
* parameter is examined so NULL is OK here.
*/
ret = __vm_sev_ioctl(vm, cmd_id, NULL);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"Should not be able call command: %d. ret: %d, errno: %d",
cmd_id, ret, errno);
}
vm_sev_ioctl(vm, KVM_SEV_GUEST_STATUS, &status);
}
static void test_sev_mirror(bool es)
{
struct kvm_vm *src_vm, *dst_vm;
int i;
src_vm = sev_vm_create(es);
dst_vm = aux_vm_create(false);
sev_mirror_create(dst_vm, src_vm);
/* Check that we can complete creation of the mirror VM. */
for (i = 0; i < NR_MIGRATE_TEST_VCPUS; ++i)
__vm_vcpu_add(dst_vm, i);
if (es)
vm_sev_ioctl(dst_vm, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL);
verify_mirror_allowed_cmds(dst_vm);
kvm_vm_free(src_vm);
kvm_vm_free(dst_vm);
}
static void test_sev_mirror_parameters(void)
{
struct kvm_vm *sev_vm, *sev_es_vm, *vm_no_vcpu, *vm_with_vcpu;
int ret;
sev_vm = sev_vm_create(/* es= */ false);
vm_with_vcpu = aux_vm_create(true);
vm_no_vcpu = aux_vm_create(false);
ret = __sev_mirror_create(sev_vm, sev_vm);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"Should not be able copy context to self. ret: %d, errno: %d",
ret, errno);
ret = __sev_mirror_create(vm_no_vcpu, vm_with_vcpu);
TEST_ASSERT(ret == -1 && errno == EINVAL,
"Copy context requires SEV enabled. ret %d, errno: %d", ret,
errno);
ret = __sev_mirror_create(vm_with_vcpu, sev_vm);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"SEV copy context requires no vCPUS on the destination. ret: %d, errno: %d",
ret, errno);
if (!have_sev_es)
goto out;
sev_es_vm = sev_vm_create(/* es= */ true);
ret = __sev_mirror_create(sev_vm, sev_es_vm);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"Should not be able copy context to SEV enabled VM. ret: %d, errno: %d",
ret, errno);
ret = __sev_mirror_create(sev_es_vm, sev_vm);
TEST_ASSERT(
ret == -1 && errno == EINVAL,
"Should not be able copy context to SEV-ES enabled VM. ret: %d, errno: %d",
ret, errno);
kvm_vm_free(sev_es_vm);
out:
kvm_vm_free(sev_vm);
kvm_vm_free(vm_with_vcpu);
kvm_vm_free(vm_no_vcpu);
}
static void test_sev_move_copy(void)
{
struct kvm_vm *dst_vm, *dst2_vm, *dst3_vm, *sev_vm, *mirror_vm,
*dst_mirror_vm, *dst2_mirror_vm, *dst3_mirror_vm;
sev_vm = sev_vm_create(/* es= */ false);
dst_vm = aux_vm_create(true);
dst2_vm = aux_vm_create(true);
dst3_vm = aux_vm_create(true);
mirror_vm = aux_vm_create(false);
dst_mirror_vm = aux_vm_create(false);
dst2_mirror_vm = aux_vm_create(false);
dst3_mirror_vm = aux_vm_create(false);
sev_mirror_create(mirror_vm, sev_vm);
sev_migrate_from(dst_mirror_vm, mirror_vm);
sev_migrate_from(dst_vm, sev_vm);
sev_migrate_from(dst2_vm, dst_vm);
sev_migrate_from(dst2_mirror_vm, dst_mirror_vm);
sev_migrate_from(dst3_mirror_vm, dst2_mirror_vm);
sev_migrate_from(dst3_vm, dst2_vm);
kvm_vm_free(dst_vm);
kvm_vm_free(sev_vm);
kvm_vm_free(dst2_vm);
kvm_vm_free(dst3_vm);
kvm_vm_free(mirror_vm);
kvm_vm_free(dst_mirror_vm);
kvm_vm_free(dst2_mirror_vm);
kvm_vm_free(dst3_mirror_vm);
/*
* Run similar test be destroy mirrors before mirrored VMs to ensure
* destruction is done safely.
*/
sev_vm = sev_vm_create(/* es= */ false);
dst_vm = aux_vm_create(true);
mirror_vm = aux_vm_create(false);
dst_mirror_vm = aux_vm_create(false);
sev_mirror_create(mirror_vm, sev_vm);
sev_migrate_from(dst_mirror_vm, mirror_vm);
sev_migrate_from(dst_vm, sev_vm);
kvm_vm_free(mirror_vm);
kvm_vm_free(dst_mirror_vm);
kvm_vm_free(dst_vm);
kvm_vm_free(sev_vm);
}
int main(int argc, char *argv[])
{
TEST_REQUIRE(kvm_has_cap(KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM));
TEST_REQUIRE(kvm_has_cap(KVM_CAP_VM_COPY_ENC_CONTEXT_FROM));
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SEV));
have_sev_es = kvm_cpu_has(X86_FEATURE_SEV_ES);
if (kvm_has_cap(KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM)) {
test_sev_migrate_from(/* es= */ false);
if (have_sev_es)
test_sev_migrate_from(/* es= */ true);
test_sev_migrate_locking();
test_sev_migrate_parameters();
if (kvm_has_cap(KVM_CAP_VM_COPY_ENC_CONTEXT_FROM))
test_sev_move_copy();
}
if (kvm_has_cap(KVM_CAP_VM_COPY_ENC_CONTEXT_FROM)) {
test_sev_mirror(/* es= */ false);
if (have_sev_es)
test_sev_mirror(/* es= */ true);
test_sev_mirror_parameters();
}
return 0;
}
Codebase Browser
linux