linux-kernel - [PATCH 125/128] KVM: selftests: Drop @num_percpu_pages from __vm_create_with

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Date:   Wed,  4 May 2022 22:49:11 +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 125/128] KVM: selftests: Drop @num_percpu_pages from __vm_create_with_vcpus()

Drop @num_percpu_pages from __vm_create_with_vcpus(), all callers pass
'0' and there's unlikely to be a test that allocates just enough memory
that it needs a per-CPU allocation, but not so much that it won't just do
its own memory management.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/include/kvm_util_base.h | 4 ++--
 tools/testing/selftests/kvm/kvm_page_table_test.c   | 2 +-
 tools/testing/selftests/kvm/lib/kvm_util.c          | 7 +++----
 tools/testing/selftests/kvm/lib/perf_test_util.c    | 2 +-
 4 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 7867f6c7ae2c..b9c806982dbd 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -543,14 +543,14 @@ static inline struct kvm_vm *vm_create(uint64_t nr_pages)
 }
 
 struct kvm_vm *__vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
-				      uint64_t extra_mem_pages, uint32_t num_percpu_pages,
+				      uint64_t extra_mem_pages,
 				      void *guest_code, 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, 0, 0,
+	return __vm_create_with_vcpus(VM_MODE_DEFAULT, nr_vcpus, 0,
 				      guest_code, vcpus);
 }
 
diff --git a/tools/testing/selftests/kvm/kvm_page_table_test.c b/tools/testing/selftests/kvm/kvm_page_table_test.c
index a68c57572ab4..f42c6ac6d71d 100644
--- a/tools/testing/selftests/kvm/kvm_page_table_test.c
+++ b/tools/testing/selftests/kvm/kvm_page_table_test.c
@@ -254,7 +254,7 @@ 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, guest_num_pages, 0,
+	vm = __vm_create_with_vcpus(mode, nr_vcpus, guest_num_pages,
 				    guest_code, test_args.vcpus);
 
 	/* Align down GPA of the testing memslot */
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index a63acd40bcf5..a8bbafc67d97 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -285,7 +285,6 @@ struct kvm_vm *__vm_create(enum vm_guest_mode mode, uint64_t nr_pages)
  *   mode - VM Mode (e.g. VM_MODE_P52V48_4K)
  *   nr_vcpus - VCPU count
  *   extra_mem_pages - Non-slot0 physical memory total size
- *   num_percpu_pages - Per-cpu physical memory pages
  *   guest_code - Guest entry point
  *   vcpuids - VCPU IDs
  *
@@ -299,7 +298,7 @@ struct kvm_vm *__vm_create(enum vm_guest_mode mode, uint64_t nr_pages)
  * 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 extra_mem_pages, uint32_t num_percpu_pages,
+				      uint64_t extra_mem_pages,
 				      void *guest_code, struct kvm_vcpu *vcpus[])
 {
 	uint64_t vcpu_pages, extra_pg_pages, pages;
@@ -314,7 +313,7 @@ struct kvm_vm *__vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus
 	 * N pages) will be: N/x+N/x^2+N/x^3+... which is definitely smaller
 	 * than N/x*2.
 	 */
-	vcpu_pages = (DEFAULT_STACK_PGS + num_percpu_pages) * nr_vcpus;
+	vcpu_pages = nr_vcpus * DEFAULT_STACK_PGS;
 	extra_pg_pages = (DEFAULT_GUEST_PHY_PAGES + extra_mem_pages + vcpu_pages) / PTES_PER_MIN_PAGE * 2;
 	pages = DEFAULT_GUEST_PHY_PAGES + vcpu_pages + extra_pg_pages;
 
@@ -337,7 +336,7 @@ struct kvm_vm *__vm_create_with_one_vcpu(struct kvm_vcpu **vcpu,
 	struct kvm_vcpu *vcpus[1];
 	struct kvm_vm *vm;
 
-	vm = __vm_create_with_vcpus(VM_MODE_DEFAULT, 1, extra_mem_pages, 0,
+	vm = __vm_create_with_vcpus(VM_MODE_DEFAULT, 1, extra_mem_pages,
 				    guest_code, vcpus);
 
 	*vcpu = vcpus[0];
diff --git a/tools/testing/selftests/kvm/lib/perf_test_util.c b/tools/testing/selftests/kvm/lib/perf_test_util.c
index 656f309584aa..1f25ed69ca98 100644
--- a/tools/testing/selftests/kvm/lib/perf_test_util.c
+++ b/tools/testing/selftests/kvm/lib/perf_test_util.c
@@ -144,7 +144,7 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_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, nr_vcpus, guest_num_pages, 0,
+	vm = __vm_create_with_vcpus(mode, nr_vcpus, guest_num_pages,
 				    guest_code, vcpus);
 
 	pta->vm = vm;
-- 
2.36.0.464.gb9c8b46e94-goog