linux-kernel - [PATCH] selftests: kvm: Check whether SIDA memop fails for normal guests

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Message-Id: <20220215074824.188440-1-thuth@redhat.com>
Date:   Tue, 15 Feb 2022 08:48:24 +0100
From:   Thomas Huth <thuth@...hat.com>
To:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>, kvm@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] selftests: kvm: Check whether SIDA memop fails for normal guests

Commit 2c212e1baedc ("KVM: s390: Return error on SIDA memop on normal
guest") fixed the behavior of the SIDA memops for normal guests. It
would be nice to have a way to test whether the current kernel has
the fix applied or not. Thus add a check to the KVM selftests for
these two memops.

Signed-off-by: Thomas Huth <thuth@...hat.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index 9f49ead380ab..d19c3ffdea3f 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -160,6 +160,21 @@ int main(int argc, char *argv[])
 	run->psw_mask &= ~(3UL << (63 - 17));   /* Disable AR mode */
 	vcpu_run(vm, VCPU_ID);                  /* Run to sync new state */
 
+	/* Check that the SIDA calls are rejected for non-protected guests */
+	ksmo.gaddr = 0;
+	ksmo.flags = 0;
+	ksmo.size = 8;
+	ksmo.op = KVM_S390_MEMOP_SIDA_READ;
+	ksmo.buf = (uintptr_t)mem1;
+	ksmo.sida_offset = 0x1c0;
+	rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
+	TEST_ASSERT(rv == -1 && errno == EINVAL,
+		    "ioctl does not reject SIDA_READ in non-protected mode");
+	ksmo.op = KVM_S390_MEMOP_SIDA_WRITE;
+	rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
+	TEST_ASSERT(rv == -1 && errno == EINVAL,
+		    "ioctl does not reject SIDA_WRITE in non-protected mode");
+
 	kvm_vm_free(vm);
 
 	return 0;
-- 
2.27.0