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From: Sean Christopherson <seanjc@google.com>
To: Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	 Anup Patel <anup@brainfault.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	 Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	 Christian Borntraeger <borntraeger@linux.ibm.com>,
	Janosch Frank <frankja@linux.ibm.com>,
	 Claudio Imbrenda <imbrenda@linux.ibm.com>,
	Sean Christopherson <seanjc@google.com>,
	 Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	 kvm@vger.kernel.org, kvm-riscv@lists.infradead.org,
	 linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 4/9] KVM: selftests: Macrofy vm_get_stat() to auto-generate stat name string
Date: Fri, 10 Jan 2025 16:50:44 -0800	[thread overview]
Message-ID: <20250111005049.1247555-5-seanjc@google.com> (raw)
In-Reply-To: <20250111005049.1247555-1-seanjc@google.com>

Turn vm_get_stat() into a macro that generates a string for the stat name,
as opposed to taking a string.  This will allow hardening stat usage in
the future to generate errors on unknown stats at compile time.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 tools/testing/selftests/kvm/include/kvm_util.h     | 14 +++++++-------
 .../kvm/x86/dirty_log_page_splitting_test.c        |  6 +++---
 .../testing/selftests/kvm/x86/nx_huge_pages_test.c |  4 ++--
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index 4c4e5a847f67..044c2231431e 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -534,13 +534,13 @@ void read_stat_data(int stats_fd, struct kvm_stats_header *header,
 void __vm_get_stat(struct kvm_vm *vm, const char *stat_name, uint64_t *data,
 		   size_t max_elements);
 
-static inline uint64_t vm_get_stat(struct kvm_vm *vm, const char *stat_name)
-{
-	uint64_t data;
-
-	__vm_get_stat(vm, stat_name, &data, 1);
-	return data;
-}
+#define vm_get_stat(vm, stat)				\
+({							\
+	uint64_t data;					\
+							\
+	__vm_get_stat(vm, #stat, &data, 1);		\
+	data;						\
+})
 
 void vm_create_irqchip(struct kvm_vm *vm);
 
diff --git a/tools/testing/selftests/kvm/x86/dirty_log_page_splitting_test.c b/tools/testing/selftests/kvm/x86/dirty_log_page_splitting_test.c
index 2929c067c207..b0d2b04a7ff2 100644
--- a/tools/testing/selftests/kvm/x86/dirty_log_page_splitting_test.c
+++ b/tools/testing/selftests/kvm/x86/dirty_log_page_splitting_test.c
@@ -41,9 +41,9 @@ struct kvm_page_stats {
 
 static void get_page_stats(struct kvm_vm *vm, struct kvm_page_stats *stats, const char *stage)
 {
-	stats->pages_4k = vm_get_stat(vm, "pages_4k");
-	stats->pages_2m = vm_get_stat(vm, "pages_2m");
-	stats->pages_1g = vm_get_stat(vm, "pages_1g");
+	stats->pages_4k = vm_get_stat(vm, pages_4k);
+	stats->pages_2m = vm_get_stat(vm, pages_2m);
+	stats->pages_1g = vm_get_stat(vm, pages_1g);
 	stats->hugepages = stats->pages_2m + stats->pages_1g;
 
 	pr_debug("\nPage stats after %s: 4K: %ld 2M: %ld 1G: %ld huge: %ld\n",
diff --git a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
index e7efb2b35f8b..c0d84827f736 100644
--- a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
+++ b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
@@ -73,7 +73,7 @@ static void check_2m_page_count(struct kvm_vm *vm, int expected_pages_2m)
 {
 	int actual_pages_2m;
 
-	actual_pages_2m = vm_get_stat(vm, "pages_2m");
+	actual_pages_2m = vm_get_stat(vm, pages_2m);
 
 	TEST_ASSERT(actual_pages_2m == expected_pages_2m,
 		    "Unexpected 2m page count. Expected %d, got %d",
@@ -84,7 +84,7 @@ static void check_split_count(struct kvm_vm *vm, int expected_splits)
 {
 	int actual_splits;
 
-	actual_splits = vm_get_stat(vm, "nx_lpage_splits");
+	actual_splits = vm_get_stat(vm, nx_lpage_splits);
 
 	TEST_ASSERT(actual_splits == expected_splits,
 		    "Unexpected NX huge page split count. Expected %d, got %d",
-- 
2.47.1.613.gc27f4b7a9f-goog


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  parent reply	other threads:[~2025-01-11  0:57 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-11  0:50 [PATCH v2 0/9] KVM: selftests: Binary stats fixes and infra updates Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 1/9] KVM: selftests: Fix mostly theoretical leak of VM's binary stats FD Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 2/9] KVM: selftests: Close VM's binary stats FD when releasing VM Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 3/9] KVM: selftests: Assert that __vm_get_stat() actually finds a stat Sean Christopherson
2025-01-11  0:50 ` Sean Christopherson [this message]
2025-01-11  0:50 ` [PATCH v2 5/9] KVM: selftests: Add struct and helpers to wrap binary stats cache Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 6/9] KVM: selftests: Get VM's binary stats FD when opening VM Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 7/9] KVM: selftests: Adjust number of files rlimit for all "standard" VMs Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 8/9] KVM: selftests: Add infrastructure for getting vCPU binary stats Sean Christopherson
2025-01-16  5:14   ` Manali Shukla
2025-01-11  0:50 ` [PATCH v2 9/9] KVM: selftests: Add compile-time assertions to guard against stats typos Sean Christopherson
2025-02-15  0:50 ` [PATCH v2 0/9] KVM: selftests: Binary stats fixes and infra updates Sean Christopherson

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