[PATCH v2 1/4] KVM: selftests: Move vm type into _vm_create() internally

Peter Xu
2019-08-29T02:21:41Z

Rather than passing the vm type from the top level to the end of vm
creation, let's simply keep that as an internal of kvm_vm struct and
decide the type in _vm_create(). Several reasons for doing this:

- The vm type is only decided by physical address width and currently
only used in aarch64, so we've got enough information as long as
we're passing vm_guest_mode into _vm_create(),

- This removes a loop dependency between the vm->type and creation of
vms. That's why now we need to parse vm_guest_mode twice sometimes,
once in run_test() and then again in _vm_create(). The follow up
patches will move on to clean up that as well so we can have a
single place to decide guest machine types and so.

Note that this patch will slightly change the behavior of aarch64
tests in that previously most vm_create() callers will directly pass
in type==0 into _vm_create() but now the type will depend on
vm_guest_mode, however it shouldn't affect any user because all
vm_create() users of aarch64 will be using VM_MODE_DEFAULT guest
mode (which is VM_MODE_P40V48_4K) so at last type will still be zero.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
tools/testing/selftests/kvm/dirty_log_test.c | 13 +++---------
.../testing/selftests/kvm/include/kvm_util.h | 3 +--
tools/testing/selftests/kvm/lib/kvm_util.c | 21 ++++++++++++-------
3 files changed, 17 insertions(+), 20 deletions(-)

diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index ceb52b952637..135cba5c6d0d 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -216,14 +216,12 @@ static void vm_dirty_log_verify(unsigned long *bmap)
}

static struct kvm_vm *create_vm(enum vm_guest_mode mode, uint32_t vcpuid,
- uint64_t extra_mem_pages, void *guest_code,
- unsigned long type)
+ uint64_t extra_mem_pages, void *guest_code)
{
struct kvm_vm *vm;
uint64_t extra_pg_pages = extra_mem_pages / 512 * 2;

- vm = _vm_create(mode, DEFAULT_GUEST_PHY_PAGES + extra_pg_pages,
- O_RDWR, type);
+ vm = _vm_create(mode, DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, O_RDWR);
kvm_vm_elf_load(vm, program_invocation_name, 0, 0);
#ifdef __x86_64__
vm_create_irqchip(vm);
@@ -240,7 +238,6 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
struct kvm_vm *vm;
uint64_t max_gfn;
unsigned long *bmap;
- unsigned long type = 0;

switch (mode) {
case VM_MODE_P52V48_4K:
@@ -281,10 +278,6 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
* bits we can change to 39.
*/
guest_pa_bits = 39;
-#endif
-#ifdef __aarch64__
- if (guest_pa_bits != 40)
- type = KVM_VM_TYPE_ARM_IPA_SIZE(guest_pa_bits);
#endif
max_gfn = (1ul << (guest_pa_bits - guest_page_shift)) - 1;
guest_page_size = (1ul << guest_page_shift);
@@ -309,7 +302,7 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
bmap = bitmap_alloc(host_num_pages);
host_bmap_track = bitmap_alloc(host_num_pages);

- vm = create_vm(mode, VCPU_ID, guest_num_pages, guest_code, type);
+ vm = create_vm(mode, VCPU_ID, guest_num_pages, guest_code);

#ifdef USE_CLEAR_DIRTY_LOG
struct kvm_enable_cap cap = {};
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index e0e66b115ef2..c78faa2ff7f3 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -60,8 +60,7 @@ int kvm_check_cap(long cap);
int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap);

struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm);
-struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
- int perm, unsigned long type);
+struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm);
void kvm_vm_free(struct kvm_vm *vmp);
void kvm_vm_restart(struct kvm_vm *vmp, int perm);
void kvm_vm_release(struct kvm_vm *vmp);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 6e49bb039376..34a8a6572c7c 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -84,7 +84,7 @@ int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap)
return ret;
}

-static void vm_open(struct kvm_vm *vm, int perm, unsigned long type)
+static void vm_open(struct kvm_vm *vm, int perm)
{
vm->kvm_fd = open(KVM_DEV_PATH, perm);
if (vm->kvm_fd < 0)
@@ -95,7 +95,7 @@ static void vm_open(struct kvm_vm *vm, int perm, unsigned long type)
exit(KSFT_SKIP);
}

- vm->fd = ioctl(vm->kvm_fd, KVM_CREATE_VM, type);
+ vm->fd = ioctl(vm->kvm_fd, KVM_CREATE_VM, vm->type);
TEST_ASSERT(vm->fd >= 0, "KVM_CREATE_VM ioctl failed, "
"rc: %i errno: %i", vm->fd, errno);
}
@@ -130,8 +130,7 @@ _Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) == NUM_VM_MODES,
* descriptor to control the created VM is created with the permissions
* given by perm (e.g. O_RDWR).
*/
-struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
- int perm, unsigned long type)
+struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
{
struct kvm_vm *vm;

@@ -139,8 +138,7 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
TEST_ASSERT(vm != NULL, "Insufficient Memory");

vm->mode = mode;
- vm->type = type;
- vm_open(vm, perm, type);
+ vm->type = 0;

/* Setup mode specific traits. */
switch (vm->mode) {
@@ -190,6 +188,13 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
TEST_ASSERT(false, "Unknown guest mode, mode: 0x%x", mode);
}

+#ifdef __aarch64__
+ if (vm->pa_bits != 40)
+ vm->type = KVM_VM_TYPE_ARM_IPA_SIZE(vm->pa_bits);
+#endif
+
+ vm_open(vm, perm);
+
/* Limit to VA-bit canonical virtual addresses. */
vm->vpages_valid = sparsebit_alloc();
sparsebit_set_num(vm->vpages_valid,
@@ -212,7 +217,7 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,

struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
{
- return _vm_create(mode, phy_pages, perm, 0);
+ return _vm_create(mode, phy_pages, perm);
}

/*
@@ -232,7 +237,7 @@ void kvm_vm_restart(struct kvm_vm *vmp, int perm)
{
struct userspace_mem_region *region;

- vm_open(vmp, perm, vmp->type);
+ vm_open(vmp, perm);
if (vmp->has_irqchip)
vm_create_irqchip(vmp);

--
2.21.0