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Date:   Thu, 1 Dec 2022 17:28:13 +0100
From:   Claudio Imbrenda <imbrenda@linux.ibm.com>
To:     Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Cc:     Christian Borntraeger <borntraeger@linux.ibm.com>,
        Janosch Frank <frankja@linux.ibm.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        David Hildenbrand <david@redhat.com>,
        Jonathan Corbet <corbet@lwn.net>, kvm@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>,
        Shuah Khan <shuah@kernel.org>,
        Sven Schnelle <svens@linux.ibm.com>
Subject: Re: [PATCH v3 4/9] KVM: s390: selftest: memop: Replace macros by
 functions
Message-ID: <20221201172813.027bcd13@p-imbrenda>
In-Reply-To: <20221117221758.66326-5-scgl@linux.ibm.com>
References: <20221117221758.66326-1-scgl@linux.ibm.com>
        <20221117221758.66326-5-scgl@linux.ibm.com>
Organization: IBM
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On Thu, 17 Nov 2022 23:17:53 +0100
Janis Schoetterl-Glausch <scgl@linux.ibm.com> wrote:

> Replace the DEFAULT_* test helpers by functions, as they don't
> need the exta flexibility.
> 
> Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.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 69869c7e2ab1..286185a59238 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) {

is this change going to affect the behaviour?
if so, please document it in the patch description

>  		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);
>  }