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Subject: Re: [PATCH v4 06/10] KVM: selftests: Add support for vcpu_args_set to
 aarch64 and s390x
To:     Ben Gardon <bgardon@google.com>, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, linux-kselftest@vger.kernel.org
Cc:     Cannon Matthews <cannonmatthews@google.com>,
        Peter Xu <peterx@redhat.com>,
        Andrew Jones <drjones@redhat.com>,
        Peter Shier <pshier@google.com>,
        Oliver Upton <oupton@google.com>,
        Marc Zyngier <Marc.Zyngier@arm.com>,
        Cornelia Huck <cohuck@redhat.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>
References: <20200123180436.99487-1-bgardon@google.com>
 <20200123180436.99487-7-bgardon@google.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <4dbb6d1b-3162-d9b3-4ebb-5e4061776bb6@redhat.com>
Date:   Fri, 24 Jan 2020 10:03:08 +0100
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CCing Marc, Conny and Christian (plus Thomas and Drew who were already
in the list) for review.

Thanks,

Paolo

On 23/01/20 19:04, Ben Gardon wrote:
> Currently vcpu_args_set is only implemented for x86. This makes writing
> tests with multiple vCPUs difficult as each guest vCPU must either a.)
> do the same thing or b.) derive some kind of unique token from it's
> registers or the architecture. To simplify the process of writing tests
> with multiple vCPUs for s390 and aarch64, add set args functions for
> those architectures.
> 
> Signed-off-by: Ben Gardon <bgardon@google.com>
> ---
>  .../selftests/kvm/lib/aarch64/processor.c     | 33 +++++++++++++++++
>  .../selftests/kvm/lib/s390x/processor.c       | 35 +++++++++++++++++++
>  2 files changed, 68 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> index 86036a59a668e..a2ff90a75f326 100644
> --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
> +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> @@ -333,3 +333,36 @@ void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
>  {
>  	aarch64_vcpu_add_default(vm, vcpuid, NULL, guest_code);
>  }
> +
> +/* VM VCPU Args Set
> + *
> + * Input Args:
> + *   vm - Virtual Machine
> + *   vcpuid - VCPU ID
> + *   num - number of arguments
> + *   ... - arguments, each of type uint64_t
> + *
> + * Output Args: None
> + *
> + * Return: None
> + *
> + * Sets the first num function input arguments to the values
> + * given as variable args.  Each of the variable args is expected to
> + * be of type uint64_t. The registers set by this function are r0-r7.
> + */
> +void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
> +{
> +	va_list ap;
> +
> +	TEST_ASSERT(num >= 1 && num <= 8, "Unsupported number of args,\n"
> +		    "  num: %u\n",
> +		    num);
> +
> +	va_start(ap, num);
> +
> +	for (i = 0; i < num; i++)
> +		set_reg(vm, vcpuid, ARM64_CORE_REG(regs.regs[num]),
> +			va_arg(ap, uint64_t));
> +
> +	va_end(ap);
> +}
> diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c
> index 32a02360b1eb0..680f37be9dbc9 100644
> --- a/tools/testing/selftests/kvm/lib/s390x/processor.c
> +++ b/tools/testing/selftests/kvm/lib/s390x/processor.c
> @@ -269,6 +269,41 @@ void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
>  	run->psw_addr = (uintptr_t)guest_code;
>  }
>  
> +/* VM VCPU Args Set
> + *
> + * Input Args:
> + *   vm - Virtual Machine
> + *   vcpuid - VCPU ID
> + *   num - number of arguments
> + *   ... - arguments, each of type uint64_t
> + *
> + * Output Args: None
> + *
> + * Return: None
> + *
> + * Sets the first num function input arguments to the values
> + * given as variable args.  Each of the variable args is expected to
> + * be of type uint64_t. The registers set by this function are r2-r6.
> + */
> +void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
> +{
> +	va_list ap;
> +	struct kvm_regs regs;
> +
> +	TEST_ASSERT(num >= 1 && num <= 5, "Unsupported number of args,\n"
> +		    "  num: %u\n",
> +		    num);
> +
> +	va_start(ap, num);
> +	vcpu_regs_get(vm, vcpuid, &regs);
> +
> +	for (i = 0; i < num; i++)
> +		regs.gprs[i + 2] = va_arg(ap, uint64_t);
> +
> +	vcpu_regs_set(vm, vcpuid, &regs);
> +	va_end(ap);
> +}
> +
>  void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
>  {
>  	struct vcpu *vcpu = vm->vcpu_head;
>