linux-kernel - Re: [PATCH v2] KVM: selftests: Add a test for the KVM_S390_MEM

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Message-Id: <1d3eb743-464f-58d6-9a0e-3bb2515f1744@linux.ibm.com>
Date:   Thu, 29 Aug 2019 14:21:29 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Thomas Huth <thuth@...hat.com>, kvm@...r.kernel.org,
        Christian Borntraeger <borntraeger@...ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH v2] KVM: selftests: Add a test for the KVM_S390_MEM_OP
 ioctl

On 8/29/19 2:14 PM, Thomas Huth wrote:
> Check that we can write and read the guest memory with this s390x
> ioctl, and that some error cases are handled correctly.
> 
> Signed-off-by: Thomas Huth <thuth@...hat.com>
> ---
>  v2: Check the ioctl also with "size" set to 0
> 
[...]
> +
> +	/* Zero size: */
> +	ksmo.gaddr = (uintptr_t)mem1;
> +	ksmo.flags = 0;
> +	ksmo.size = 0;
> +	ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> +	ksmo.buf = (uintptr_t)mem1;
> +	ksmo.ar = 0;
> +	rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> +	TEST_ASSERT(rv == -1, "ioctl allows 0 as size");

Test for errno == -EINVAL?

> +
> +	/* Bad flags: */
> +	ksmo.gaddr = (uintptr_t)mem1;
> +	ksmo.flags = -1;
> +	ksmo.size = maxsize;
> +	ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> +	ksmo.buf = (uintptr_t)mem1;
> +	ksmo.ar = 0;
> +	rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> +	TEST_ASSERT(rv == -1 && errno == EINVAL, "ioctl allows all flags?");
> +
> +	/* Bad operation: */
> +	ksmo.gaddr = (uintptr_t)mem1;
> +	ksmo.flags = 0;
> +	ksmo.size = maxsize;
> +	ksmo.op = -1;
> +	ksmo.buf = (uintptr_t)mem1;
> +	ksmo.ar = 0;
> +	rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> +	TEST_ASSERT(rv == -1 && errno == EINVAL, "ioctl allows all flags?");

Wrong report string






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