linux-kernel - [PATCH 119/128] KVM: selftests: Require vCPU output array when creating VM with vCPUs

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Message-Id: <20220504224914.1654036-120-seanjc@google.com>
Date:   Wed,  4 May 2022 22:49:05 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        David Matlack <dmatlack@...gle.com>,
        Ben Gardon <bgardon@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH 119/128] KVM: selftests: Require vCPU output array when
 creating VM with vCPUs

Require the caller of __vm_create_with_vcpus() to provide a non-NULL
array of vCPUs now that all callers do so.  It's extremely unlikely a
test will have a legitimate use case for creating a VM with vCPUs without
wanting to do something with those vCPUs, and if there is such a use case,
requiring that one-off test to provide a dummy array is a minor
annoyance.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/lib/kvm_util.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index ccd194007e90..9cc1eacacb4e 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -306,10 +306,11 @@ struct kvm_vm *__vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus
 				      struct kvm_vcpu *vcpus[])
 {
 	uint64_t vcpu_pages, extra_pg_pages, pages;
-	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
 	int i;
 
+	TEST_ASSERT(!nr_vcpus || vcpus, "Must provide vCPU array");
+
 	/* Force slot0 memory size not small than DEFAULT_GUEST_PHY_PAGES */
 	if (slot0_mem_pages < DEFAULT_GUEST_PHY_PAGES)
 		slot0_mem_pages = DEFAULT_GUEST_PHY_PAGES;
@@ -330,11 +331,8 @@ struct kvm_vm *__vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus
 
 	vm = __vm_create(mode, pages);
 
-	for (i = 0; i < nr_vcpus; ++i) {
-		vcpu = vm_vcpu_add(vm, i, guest_code);
-		if (vcpus)
-			vcpus[i] = vcpu;
-	}
+	for (i = 0; i < nr_vcpus; ++i)
+		vcpus[i] = vm_vcpu_add(vm, i, guest_code);
 
 	return vm;
 }
-- 
2.36.0.464.gb9c8b46e94-goog