linux-kernel - [RFC PATCH 084/105] KVM: selftests: Add VM creation helper that "returns" vCPUs

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Message-Id: <20220311055056.57265-85-seanjc@google.com>
Date:   Fri, 11 Mar 2022 05:50:35 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>
Subject: [RFC PATCH 084/105] KVM: selftests: Add VM creation helper that
 "returns" vCPUs

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 .../selftests/kvm/include/kvm_util_base.h       | 16 ++++++++++++----
 .../testing/selftests/kvm/kvm_page_table_test.c |  4 ++--
 tools/testing/selftests/kvm/lib/kvm_util.c      | 17 ++++++++++-------
 .../testing/selftests/kvm/lib/perf_test_util.c  |  4 ++--
 4 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 14457f98080b..051d9707e2e7 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -541,11 +541,19 @@ struct kvm_vm *vm_create_default_with_vcpus(uint32_t nr_vcpus, uint64_t extra_me
 					    uint32_t vcpuids[]);
 
 /* Like vm_create_default_with_vcpus, but accepts mode and slot0 memory as a parameter */
-struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
-				    uint64_t slot0_mem_pages, uint64_t extra_mem_pages,
-				    uint32_t num_percpu_pages, void *guest_code,
-				    uint32_t vcpuids[]);
+struct kvm_vm *__vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
+				      uint64_t slot0_mem_pages, uint64_t extra_mem_pages,
+				      uint32_t num_percpu_pages, void *guest_code,
+				      uint32_t vcpuids[], struct kvm_vcpu *vcpus[]);
 
+static inline struct kvm_vm *vm_create_with_vcpus(uint32_t nr_vcpus,
+						  void *guest_code,
+						  struct kvm_vcpu *vcpus[])
+{
+	return __vm_create_with_vcpus(VM_MODE_DEFAULT, nr_vcpus,
+				      DEFAULT_GUEST_PHY_PAGES, 0, 0,
+				      guest_code, NULL, vcpus);
+}
 
 /*
  * Create a VM with a single vCPU with reasonable defaults and @extra_mem_pages
diff --git a/tools/testing/selftests/kvm/kvm_page_table_test.c b/tools/testing/selftests/kvm/kvm_page_table_test.c
index ba1fdc3dcf4a..b969257f646d 100644
--- a/tools/testing/selftests/kvm/kvm_page_table_test.c
+++ b/tools/testing/selftests/kvm/kvm_page_table_test.c
@@ -268,8 +268,8 @@ static struct kvm_vm *pre_init_before_test(enum vm_guest_mode mode, void *arg)
 
 	/* Create a VM with enough guest pages */
 	guest_num_pages = test_mem_size / guest_page_size;
-	vm = vm_create_with_vcpus(mode, nr_vcpus, DEFAULT_GUEST_PHY_PAGES,
-				  guest_num_pages, 0, guest_code, NULL);
+	vm = __vm_create_with_vcpus(mode, nr_vcpus, DEFAULT_GUEST_PHY_PAGES,
+				    guest_num_pages, 0, guest_code, NULL, NULL);
 
 	/* Align down GPA of the testing memslot */
 	if (!p->phys_offset)
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 1580d4888d74..de568d0a2ccc 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -305,12 +305,13 @@ struct kvm_vm *vm_create(uint64_t phy_pages)
  * extra_mem_pages is only used to calculate the maximum page table size,
  * no real memory allocation for non-slot0 memory in this function.
  */
-struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
-				    uint64_t slot0_mem_pages, uint64_t extra_mem_pages,
-				    uint32_t num_percpu_pages, void *guest_code,
-				    uint32_t vcpuids[])
+struct kvm_vm *__vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
+				      uint64_t slot0_mem_pages, uint64_t extra_mem_pages,
+				      uint32_t num_percpu_pages, void *guest_code,
+				      uint32_t vcpuids[], struct kvm_vcpu *vcpus[])
 {
 	uint64_t vcpu_pages, extra_pg_pages, pages;
+	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
 	int i;
 
@@ -344,7 +345,9 @@ struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
 	for (i = 0; i < nr_vcpus; ++i) {
 		uint32_t vcpuid = vcpuids ? vcpuids[i] : i;
 
-		vm_vcpu_add(vm, vcpuid, guest_code);
+		vcpu = vm_vcpu_add(vm, vcpuid, guest_code);
+		if (vcpus)
+			vcpus[i] = vcpu;
 	}
 
 	return vm;
@@ -354,8 +357,8 @@ struct kvm_vm *vm_create_default_with_vcpus(uint32_t nr_vcpus, uint64_t extra_me
 					    uint32_t num_percpu_pages, void *guest_code,
 					    uint32_t vcpuids[])
 {
-	return vm_create_with_vcpus(VM_MODE_DEFAULT, nr_vcpus, DEFAULT_GUEST_PHY_PAGES,
-				    extra_mem_pages, num_percpu_pages, guest_code, vcpuids);
+	return __vm_create_with_vcpus(VM_MODE_DEFAULT, nr_vcpus, DEFAULT_GUEST_PHY_PAGES,
+				      extra_mem_pages, num_percpu_pages, guest_code, vcpuids, NULL);
 }
 
 struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages,
diff --git a/tools/testing/selftests/kvm/lib/perf_test_util.c b/tools/testing/selftests/kvm/lib/perf_test_util.c
index 722df3a28791..5b80ba7f12e4 100644
--- a/tools/testing/selftests/kvm/lib/perf_test_util.c
+++ b/tools/testing/selftests/kvm/lib/perf_test_util.c
@@ -139,8 +139,8 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
 	 * The memory is also added to memslot 0, but that's a benign side
 	 * effect as KVM allows aliasing HVAs in meslots.
 	 */
-	vm = vm_create_with_vcpus(mode, vcpus, DEFAULT_GUEST_PHY_PAGES,
-				  guest_num_pages, 0, guest_code, NULL);
+	vm = __vm_create_with_vcpus(mode, vcpus, DEFAULT_GUEST_PHY_PAGES,
+				    guest_num_pages, 0, guest_code, NULL, NULL);
 
 	pta->vm = vm;
 
-- 
2.35.1.723.g4982287a31-goog