[PATCH v2] KVM: selftests: Compile code with warnings enabled

From: Thomas Huth
Date: Fri May 17 2019 - 05:07:05 EST

So far the KVM selftests are compiled without any compiler warnings
enabled. That's quite bad, since we miss a lot of possible bugs this
way. Let's enable at least "-Wall" and some other useful warning flags
now, and fix at least the trivial problems in the code (like unused
variables).

Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
---
v2:
- Rebased to kvm/queue
- Fix warnings in state_test.c and evmcs_test.c, too

tools/testing/selftests/kvm/Makefile | 4 +++-
tools/testing/selftests/kvm/dirty_log_test.c | 6 +++++-
tools/testing/selftests/kvm/lib/kvm_util.c | 3 ---
tools/testing/selftests/kvm/lib/x86_64/processor.c | 4 +---
tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c | 1 +
tools/testing/selftests/kvm/x86_64/evmcs_test.c | 7 +------
tools/testing/selftests/kvm/x86_64/platform_info_test.c | 1 -
tools/testing/selftests/kvm/x86_64/smm_test.c | 3 +--
tools/testing/selftests/kvm/x86_64/state_test.c | 7 +------
.../selftests/kvm/x86_64/vmx_close_while_nested_test.c | 5 +----
tools/testing/selftests/kvm/x86_64/vmx_tsc_adjust_test.c | 5 ++---
11 files changed, 16 insertions(+), 30 deletions(-)

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 79c524395ebe..d113eaf2d570 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -34,7 +34,9 @@ LIBKVM += $(LIBKVM_$(UNAME_M))
INSTALL_HDR_PATH = $(top_srcdir)/usr
LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/
LINUX_TOOL_INCLUDE = $(top_srcdir)/tools/include
-CFLAGS += -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude -I$(<D) -Iinclude/$(UNAME_M) -I..
+CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
+ -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
+ -I$(LINUX_HDR_PATH) -Iinclude -I$(<D) -Iinclude/$(UNAME_M) -I..

no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \
$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)
diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index a29d1119ccb3..ff20950aee05 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -131,6 +131,7 @@ static void *vcpu_worker(void *data)
while (!READ_ONCE(host_quit)) {
/* Let the guest dirty the random pages */
ret = _vcpu_run(vm, VCPU_ID);
+ TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret);
if (get_ucall(vm, VCPU_ID, &uc) == UCALL_SYNC) {
pages_count += TEST_PAGES_PER_LOOP;
generate_random_array(guest_array, TEST_PAGES_PER_LOOP);
@@ -423,8 +424,11 @@ int main(int argc, char *argv[])
unsigned long interval = TEST_HOST_LOOP_INTERVAL;
bool mode_selected = false;
uint64_t phys_offset = 0;
- unsigned int mode, host_ipa_limit;
+ unsigned int mode;
int opt, i;
+#ifdef __aarch64__
+ unsigned int host_ipa_limit;
+#endif

#ifdef USE_CLEAR_DIRTY_LOG
if (!kvm_check_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2)) {
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index e9113857f44e..cf62de377310 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -135,7 +135,6 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
int perm, unsigned long type)
{
struct kvm_vm *vm;
- int kvm_fd;

vm = calloc(1, sizeof(*vm));
TEST_ASSERT(vm != NULL, "Insufficient Memory");
@@ -556,7 +555,6 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
uint32_t flags)
{
int ret;
- unsigned long pmem_size = 0;
struct userspace_mem_region *region;
size_t huge_page_size = KVM_UTIL_PGS_PER_HUGEPG * vm->page_size;

@@ -1334,7 +1332,6 @@ void vcpu_sregs_set(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_sregs *sregs)
int _vcpu_sregs_set(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_sregs *sregs)
{
struct vcpu *vcpu = vcpu_find(vm, vcpuid);
- int ret;

TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index dc7fae9fa424..21f3040d90cb 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -229,8 +229,6 @@ void sregs_dump(FILE *stream, struct kvm_sregs *sregs,

void virt_pgd_alloc(struct kvm_vm *vm, uint32_t pgd_memslot)
{
- int rc;
-
TEST_ASSERT(vm->mode == VM_MODE_P52V48_4K, "Attempt to use "
"unknown or unsupported guest mode, mode: 0x%x", vm->mode);

@@ -549,7 +547,6 @@ vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
struct pageDirectoryPointerEntry *pdpe;
struct pageDirectoryEntry *pde;
struct pageTableEntry *pte;
- void *hva;

TEST_ASSERT(vm->mode == VM_MODE_P52V48_4K, "Attempt to use "
"unknown or unsupported guest mode, mode: 0x%x", vm->mode);
@@ -582,6 +579,7 @@ vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
unmapped_gva:
TEST_ASSERT(false, "No mapping for vm virtual address, "
"gva: 0x%lx", gva);
+ exit(EXIT_FAILURE);
}

static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt, int gdt_memslot,
diff --git a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
index 7c2c4d4055a8..63cc9c3f5ab6 100644
--- a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
+++ b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
@@ -87,6 +87,7 @@ int main(int argc, char *argv[])
while (1) {
rc = _vcpu_run(vm, VCPU_ID);

+ TEST_ASSERT(rc == 0, "vcpu_run failed: %d\n", rc);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Unexpected exit reason: %u (%s),\n",
run->exit_reason,
diff --git a/tools/testing/selftests/kvm/x86_64/evmcs_test.c b/tools/testing/selftests/kvm/x86_64/evmcs_test.c
index 36669684eca5..b38260e29775 100644
--- a/tools/testing/selftests/kvm/x86_64/evmcs_test.c
+++ b/tools/testing/selftests/kvm/x86_64/evmcs_test.c
@@ -19,8 +19,6 @@

#define VCPU_ID 5

-static bool have_nested_state;
-
void l2_guest_code(void)
{
GUEST_SYNC(6);
@@ -73,7 +71,6 @@ void guest_code(struct vmx_pages *vmx_pages)

int main(int argc, char *argv[])
{
- struct vmx_pages *vmx_pages = NULL;
vm_vaddr_t vmx_pages_gva = 0;

struct kvm_regs regs1, regs2;
@@ -88,8 +85,6 @@ int main(int argc, char *argv[])
.args[0] = (unsigned long)&evmcs_ver
};

- struct kvm_cpuid_entry2 *entry = kvm_get_supported_cpuid_entry(1);
-
/* Create VM */
vm = vm_create_default(VCPU_ID, 0, guest_code);

@@ -113,7 +108,7 @@ int main(int argc, char *argv[])

vcpu_regs_get(vm, VCPU_ID, &regs1);

- vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
+ vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);

for (stage = 1;; stage++) {
diff --git a/tools/testing/selftests/kvm/x86_64/platform_info_test.c b/tools/testing/selftests/kvm/x86_64/platform_info_test.c
index eb3e7a838cb4..40050e44ec0a 100644
--- a/tools/testing/selftests/kvm/x86_64/platform_info_test.c
+++ b/tools/testing/selftests/kvm/x86_64/platform_info_test.c
@@ -81,7 +81,6 @@ static void test_msr_platform_info_disabled(struct kvm_vm *vm)
int main(int argc, char *argv[])
{
struct kvm_vm *vm;
- struct kvm_run *state;
int rv;
uint64_t msr_platform_info;

diff --git a/tools/testing/selftests/kvm/x86_64/smm_test.c b/tools/testing/selftests/kvm/x86_64/smm_test.c
index fb8086964d83..4daf520bada1 100644
--- a/tools/testing/selftests/kvm/x86_64/smm_test.c
+++ b/tools/testing/selftests/kvm/x86_64/smm_test.c
@@ -87,7 +87,6 @@ void guest_code(struct vmx_pages *vmx_pages)

int main(int argc, char *argv[])
{
- struct vmx_pages *vmx_pages = NULL;
vm_vaddr_t vmx_pages_gva = 0;

struct kvm_regs regs;
@@ -115,7 +114,7 @@ int main(int argc, char *argv[])
vcpu_set_msr(vm, VCPU_ID, MSR_IA32_SMBASE, SMRAM_GPA);

if (kvm_check_cap(KVM_CAP_NESTED_STATE)) {
- vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
+ vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
} else {
printf("will skip SMM test with VMX enabled\n");
diff --git a/tools/testing/selftests/kvm/x86_64/state_test.c b/tools/testing/selftests/kvm/x86_64/state_test.c
index e0a3c0204b7c..2a4121f4de01 100644
--- a/tools/testing/selftests/kvm/x86_64/state_test.c
+++ b/tools/testing/selftests/kvm/x86_64/state_test.c
@@ -22,8 +22,6 @@

#define VCPU_ID 5

-static bool have_nested_state;
-
void l2_guest_code(void)
{
GUEST_SYNC(6);
@@ -122,7 +120,6 @@ void guest_code(struct vmx_pages *vmx_pages)

int main(int argc, char *argv[])
{
- struct vmx_pages *vmx_pages = NULL;
vm_vaddr_t vmx_pages_gva = 0;

struct kvm_regs regs1, regs2;
@@ -132,8 +129,6 @@ int main(int argc, char *argv[])
struct ucall uc;
int stage;

- struct kvm_cpuid_entry2 *entry = kvm_get_supported_cpuid_entry(1);
-
/* Create VM */
vm = vm_create_default(VCPU_ID, 0, guest_code);
vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
@@ -142,7 +137,7 @@ int main(int argc, char *argv[])
vcpu_regs_get(vm, VCPU_ID, &regs1);

if (kvm_check_cap(KVM_CAP_NESTED_STATE)) {
- vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
+ vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
} else {
printf("will skip nested state checks\n");
diff --git a/tools/testing/selftests/kvm/x86_64/vmx_close_while_nested_test.c b/tools/testing/selftests/kvm/x86_64/vmx_close_while_nested_test.c
index 6edec6fd790b..97182b47b10c 100644
--- a/tools/testing/selftests/kvm/x86_64/vmx_close_while_nested_test.c
+++ b/tools/testing/selftests/kvm/x86_64/vmx_close_while_nested_test.c
@@ -39,8 +39,6 @@ static void l1_guest_code(struct vmx_pages *vmx_pages)
{
#define L2_GUEST_STACK_SIZE 64
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
- uint32_t control;
- uintptr_t save_cr3;

GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
GUEST_ASSERT(load_vmcs(vmx_pages));
@@ -55,7 +53,6 @@ static void l1_guest_code(struct vmx_pages *vmx_pages)

int main(int argc, char *argv[])
{
- struct vmx_pages *vmx_pages;
vm_vaddr_t vmx_pages_gva;
struct kvm_cpuid_entry2 *entry = kvm_get_supported_cpuid_entry(1);

@@ -68,7 +65,7 @@ int main(int argc, char *argv[])
vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());

/* Allocate VMX pages and shared descriptors (vmx_pages). */
- vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
+ vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);

for (;;) {
diff --git a/tools/testing/selftests/kvm/x86_64/vmx_tsc_adjust_test.c b/tools/testing/selftests/kvm/x86_64/vmx_tsc_adjust_test.c
index 18fa64db0d7a..6d37a3173956 100644
--- a/tools/testing/selftests/kvm/x86_64/vmx_tsc_adjust_test.c
+++ b/tools/testing/selftests/kvm/x86_64/vmx_tsc_adjust_test.c
@@ -121,7 +121,7 @@ static void l1_guest_code(struct vmx_pages *vmx_pages)
GUEST_DONE();
}

-void report(int64_t val)
+static void report(int64_t val)
{
printf("IA32_TSC_ADJUST is %ld (%lld * TSC_ADJUST_VALUE + %lld).\n",
val, val / TSC_ADJUST_VALUE, val % TSC_ADJUST_VALUE);
@@ -129,7 +129,6 @@ void report(int64_t val)

int main(int argc, char *argv[])
{
- struct vmx_pages *vmx_pages;
vm_vaddr_t vmx_pages_gva;
struct kvm_cpuid_entry2 *entry = kvm_get_supported_cpuid_entry(1);

@@ -142,7 +141,7 @@ int main(int argc, char *argv[])
vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());

/* Allocate VMX pages and shared descriptors (vmx_pages). */
- vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
+ vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);

for (;;) {
--
2.21.0