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

[Janosch Frank <frankja@linux.ibm.com>]

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@linux.ibm.com>

> 
> Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> ---
>   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);
>   }