Re: [PATCH v6 02/14] KVM: s390: selftest: memop: Replace macros by functions

Janosch Frank <frankja@xxxxxxxxxxxxx> · Thu, 26 Jan 2023 13:00:48 +0100

On 1/25/23 22:25, Janis Schoetterl-Glausch wrote:
Replace the DEFAULT_* test helpers by functions, as they don't
need the exta flexibility.

s/exta/extra/

But if you want I can fix that up.

The __VA_ARGS__ often don't make it easier to understand therefore I'd 
rather have a function so I'm happy this patch removes a bit of the magic:

Acked-by: Janosch Frank <frankja@xxxxxxxxxxxxx>


Signed-off-by: Janis Schoetterl-Glausch <scgl@xxxxxxxxxxxxx>
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
---
  tools/testing/selftests/kvm/s390x/memop.c | 82 +++++++++++------------
  1 file changed, 39 insertions(+), 43 deletions(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index 9c05d1205114..df1c726294b2 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -48,6 +48,8 @@ struct mop_desc {
  	uint8_t key;
  };
  
+const uint8_t NO_KEY = 0xff;
+
  static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc)
  {
  	struct kvm_s390_mem_op ksmo = {
@@ -85,7 +87,7 @@ static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc)
  		ksmo.flags |= KVM_S390_MEMOP_F_INJECT_EXCEPTION;
  	if (desc->_set_flags)
  		ksmo.flags = desc->set_flags;
-	if (desc->f_key) {
+	if (desc->f_key && desc->key != NO_KEY) {
  		ksmo.flags |= KVM_S390_MEMOP_F_SKEY_PROTECTION;
  		ksmo.key = desc->key;
  	}
@@ -268,34 +270,28 @@ static void prepare_mem12(void)
  #define ASSERT_MEM_EQ(p1, p2, size) \
  	TEST_ASSERT(!memcmp(p1, p2, size), "Memory contents do not match!")
  
-#define DEFAULT_WRITE_READ(copy_cpu, mop_cpu, mop_target_p, size, ...)		\
-({										\
-	struct test_info __copy_cpu = (copy_cpu), __mop_cpu = (mop_cpu);	\
-	enum mop_target __target = (mop_target_p);				\
-	uint32_t __size = (size);						\
-										\
-	prepare_mem12();							\
-	CHECK_N_DO(MOP, __mop_cpu, __target, WRITE, mem1, __size,		\
-			GADDR_V(mem1), ##__VA_ARGS__);				\
-	HOST_SYNC(__copy_cpu, STAGE_COPIED);					\
-	CHECK_N_DO(MOP, __mop_cpu, __target, READ, mem2, __size,		\
-			GADDR_V(mem2), ##__VA_ARGS__);				\
-	ASSERT_MEM_EQ(mem1, mem2, __size);					\
-})
+static void default_write_read(struct test_info copy_cpu, struct test_info mop_cpu,
+			       enum mop_target mop_target, uint32_t size, uint8_t key)
+{
+	prepare_mem12();
+	CHECK_N_DO(MOP, mop_cpu, mop_target, WRITE, mem1, size,
+		   GADDR_V(mem1), KEY(key));
+	HOST_SYNC(copy_cpu, STAGE_COPIED);
+	CHECK_N_DO(MOP, mop_cpu, mop_target, READ, mem2, size,
+		   GADDR_V(mem2), KEY(key));
+	ASSERT_MEM_EQ(mem1, mem2, size);
+}
  
-#define DEFAULT_READ(copy_cpu, mop_cpu, mop_target_p, size, ...)		\
-({										\
-	struct test_info __copy_cpu = (copy_cpu), __mop_cpu = (mop_cpu);	\
-	enum mop_target __target = (mop_target_p);				\
-	uint32_t __size = (size);						\
-										\
-	prepare_mem12();							\
-	CHECK_N_DO(MOP, __mop_cpu, __target, WRITE, mem1, __size,		\
-			GADDR_V(mem1));						\
-	HOST_SYNC(__copy_cpu, STAGE_COPIED);					\
-	CHECK_N_DO(MOP, __mop_cpu, __target, READ, mem2, __size, ##__VA_ARGS__);\
-	ASSERT_MEM_EQ(mem1, mem2, __size);					\
-})
+static void default_read(struct test_info copy_cpu, struct test_info mop_cpu,
+			 enum mop_target mop_target, uint32_t size, uint8_t key)
+{
+	prepare_mem12();
+	CHECK_N_DO(MOP, mop_cpu, mop_target, WRITE, mem1, size, GADDR_V(mem1));
+	HOST_SYNC(copy_cpu, STAGE_COPIED);
+	CHECK_N_DO(MOP, mop_cpu, mop_target, READ, mem2, size,
+		   GADDR_V(mem2), KEY(key));
+	ASSERT_MEM_EQ(mem1, mem2, size);
+}
  
  static void guest_copy(void)
  {
@@ -310,7 +306,7 @@ static void test_copy(void)
  
  	HOST_SYNC(t.vcpu, STAGE_INITED);
  
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size);
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, NO_KEY);
  
  	kvm_vm_free(t.kvm_vm);
  }
@@ -357,26 +353,26 @@ static void test_copy_key(void)
  	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
  
  	/* vm, no key */
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, NO_KEY);
  
  	/* vm/vcpu, machting key or key 0 */
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(0));
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(9));
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size, KEY(0));
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size, KEY(9));
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 0);
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 9);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, 0);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, 9);
  	/*
  	 * There used to be different code paths for key handling depending on
  	 * if the region crossed a page boundary.
  	 * There currently are not, but the more tests the merrier.
  	 */
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, 1, KEY(0));
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, 1, KEY(9));
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, 1, KEY(0));
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, 1, KEY(9));
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, 1, 0);
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, 1, 9);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, 1, 0);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, 1, 9);
  
  	/* vm/vcpu, mismatching keys on read, but no fetch protection */
-	DEFAULT_READ(t.vcpu, t.vcpu, LOGICAL, t.size, GADDR_V(mem2), KEY(2));
-	DEFAULT_READ(t.vcpu, t.vm, ABSOLUTE, t.size, GADDR_V(mem1), KEY(2));
+	default_read(t.vcpu, t.vcpu, LOGICAL, t.size, 2);
+	default_read(t.vcpu, t.vm, ABSOLUTE, t.size, 2);
  
  	kvm_vm_free(t.kvm_vm);
  }
@@ -409,7 +405,7 @@ static void test_copy_key_storage_prot_override(void)
  	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
  
  	/* vcpu, mismatching keys, storage protection override in effect */
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(2));
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 2);
  
  	kvm_vm_free(t.kvm_vm);
  }
@@ -422,8 +418,8 @@ static void test_copy_key_fetch_prot(void)
  	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
  
  	/* vm/vcpu, matching key, fetch protection in effect */
-	DEFAULT_READ(t.vcpu, t.vcpu, LOGICAL, t.size, GADDR_V(mem2), KEY(9));
-	DEFAULT_READ(t.vcpu, t.vm, ABSOLUTE, t.size, GADDR_V(mem2), KEY(9));
+	default_read(t.vcpu, t.vcpu, LOGICAL, t.size, 9);
+	default_read(t.vcpu, t.vm, ABSOLUTE, t.size, 9);
  
  	kvm_vm_free(t.kvm_vm);
  }







