linux-kernel - [RFC PATCH 027/105] KVM: selftests: Add vm_create_*() variants to expose/return 'struct vcpu'

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Date:   Fri, 11 Mar 2022 05:49:38 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>
Subject: [RFC PATCH 027/105] KVM: selftests: Add vm_create_*() variants to
 expose/return 'struct vcpu'

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 .../selftests/kvm/include/kvm_util_base.h      | 17 +++++++++++++++++
 tools/testing/selftests/kvm/lib/kvm_util.c     | 18 ++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 21020d6a4f01..e87988665607 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -619,6 +619,23 @@ struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
 				    uint32_t num_percpu_pages, void *guest_code,
 				    uint32_t vcpuids[]);
 
+
+/*
+ * Create a VM with a single vCPU with reasonable defaults and @extra_mem_pages
+ * additional pages of guest memory.  Returns the VM and vCPU (via out param).
+ */
+struct kvm_vm *__vm_create_with_one_vcpu(struct vcpu **vcpu,
+					 uint64_t extra_mem_pages,
+					 void *guest_code);
+
+static inline struct kvm_vm *vm_create_with_one_vcpu(struct vcpu **vcpu,
+						     void *guest_code)
+{
+	return __vm_create_with_one_vcpu(vcpu, 0, guest_code);
+}
+
+struct vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm);
+
 /*
  * Adds a vCPU with reasonable defaults (e.g. a stack)
  *
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index ed7e2c5b0062..0c088454e600 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -365,6 +365,16 @@ struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages,
 					    (uint32_t []){ vcpuid });
 }
 
+struct kvm_vm *__vm_create_with_one_vcpu(struct vcpu **vcpu,
+					 uint64_t extra_mem_pages,
+					 void *guest_code)
+{
+	struct kvm_vm *vm = vm_create_default(0, extra_mem_pages, guest_code);
+
+	*vcpu = vcpu_get(vm, 0);
+	return vm;
+}
+
 /*
  * VM Restart
  *
@@ -399,6 +409,14 @@ void kvm_vm_restart(struct kvm_vm *vmp)
 	}
 }
 
+struct vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm)
+{
+	kvm_vm_restart(vm);
+
+	vm_vcpu_add(vm, 0);
+	return vcpu_get(vm, 0);
+}
+
 /*
  * Userspace Memory Region Find
  *
-- 
2.35.1.723.g4982287a31-goog