linux-kernel - [PATCH 10/15] KVM: selftests: Remove perf_test_args.host_page

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Message-Id: <20210210230625.550939-11-seanjc@google.com>
Date:   Wed, 10 Feb 2021 15:06:20 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Ben Gardon <bgardon@...gle.com>,
        Yanan Wang <wangyanan55@...wei.com>,
        Andrew Jones <drjones@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Aaron Lewis <aaronlewis@...gle.com>
Subject: [PATCH 10/15] KVM: selftests: Remove perf_test_args.host_page_size

Remove perf_test_args.host_page_size and instead use getpagesize() so
that it's somewhat obvious that, for tests that care about the host page
size, they care about the system page size, not the hardware page size,
e.g. that the logic is unchanged if hugepages are in play.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/demand_paging_test.c          | 8 ++++----
 tools/testing/selftests/kvm/include/perf_test_util.h      | 1 -
 tools/testing/selftests/kvm/lib/perf_test_util.c          | 6 ++----
 .../selftests/kvm/memslot_modification_stress_test.c      | 2 +-
 4 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
index 0cbf111e6c21..b937a65b0e6d 100644
--- a/tools/testing/selftests/kvm/demand_paging_test.c
+++ b/tools/testing/selftests/kvm/demand_paging_test.c
@@ -83,7 +83,7 @@ static int handle_uffd_page_request(int uffd, uint64_t addr)
 
 	copy.src = (uint64_t)guest_data_prototype;
 	copy.dst = addr;
-	copy.len = perf_test_args.host_page_size;
+	copy.len = getpagesize();
 	copy.mode = 0;
 
 	clock_gettime(CLOCK_MONOTONIC, &start);
@@ -100,7 +100,7 @@ static int handle_uffd_page_request(int uffd, uint64_t addr)
 	PER_PAGE_DEBUG("UFFDIO_COPY %d \t%ld ns\n", tid,
 		       timespec_to_ns(ts_diff));
 	PER_PAGE_DEBUG("Paged in %ld bytes at 0x%lx from thread %d\n",
-		       perf_test_args.host_page_size, addr, tid);
+		       getpagesize(), addr, tid);
 
 	return 0;
 }
@@ -271,10 +271,10 @@ static void run_test(enum vm_guest_mode mode, void *arg)
 
 	perf_test_args.wr_fract = 1;
 
-	guest_data_prototype = malloc(perf_test_args.host_page_size);
+	guest_data_prototype = malloc(getpagesize());
 	TEST_ASSERT(guest_data_prototype,
 		    "Failed to allocate buffer for guest data pattern");
-	memset(guest_data_prototype, 0xAB, perf_test_args.host_page_size);
+	memset(guest_data_prototype, 0xAB, getpagesize());
 
 	vcpu_threads = malloc(nr_vcpus * sizeof(*vcpu_threads));
 	TEST_ASSERT(vcpu_threads, "Memory allocation failed");
diff --git a/tools/testing/selftests/kvm/include/perf_test_util.h b/tools/testing/selftests/kvm/include/perf_test_util.h
index cccf1c44bddb..223fe6b79a04 100644
--- a/tools/testing/selftests/kvm/include/perf_test_util.h
+++ b/tools/testing/selftests/kvm/include/perf_test_util.h
@@ -28,7 +28,6 @@ struct perf_test_vcpu_args {
 
 struct perf_test_args {
 	struct kvm_vm *vm;
-	uint64_t host_page_size;
 	uint64_t gpa;
 	uint64_t guest_page_size;
 	int wr_fract;
diff --git a/tools/testing/selftests/kvm/lib/perf_test_util.c b/tools/testing/selftests/kvm/lib/perf_test_util.c
index 03f125236021..982a86c8eeaa 100644
--- a/tools/testing/selftests/kvm/lib/perf_test_util.c
+++ b/tools/testing/selftests/kvm/lib/perf_test_util.c
@@ -57,8 +57,6 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
 
 	pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode));
 
-	pta->host_page_size = getpagesize();
-
 	/*
 	 * Snapshot the non-huge page size.  This is used by the guest code to
 	 * access/dirty pages at the logging granularity.
@@ -68,7 +66,7 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
 	guest_num_pages = vm_adjust_num_guest_pages(mode,
 				(vcpus * vcpu_memory_bytes) / pta->guest_page_size);
 
-	TEST_ASSERT(vcpu_memory_bytes % pta->host_page_size == 0,
+	TEST_ASSERT(vcpu_memory_bytes % getpagesize() == 0,
 		    "Guest memory size is not host page size aligned.");
 	TEST_ASSERT(vcpu_memory_bytes % pta->guest_page_size == 0,
 		    "Guest memory size is not guest page size aligned.");
@@ -88,7 +86,7 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
 		    guest_num_pages, vm_get_max_gfn(vm), vcpus, vcpu_memory_bytes);
 
 	pta->gpa = (vm_get_max_gfn(vm) - guest_num_pages) * pta->guest_page_size;
-	pta->gpa &= ~(pta->host_page_size - 1);
+	pta->gpa &= ~(getpagesize() - 1);
 	if (backing_src == VM_MEM_SRC_ANONYMOUS_THP ||
 	    backing_src == VM_MEM_SRC_ANONYMOUS_HUGETLB)
 		pta->gpa &= ~(KVM_UTIL_HUGEPAGE_ALIGNMENT - 1);
diff --git a/tools/testing/selftests/kvm/memslot_modification_stress_test.c b/tools/testing/selftests/kvm/memslot_modification_stress_test.c
index 569bb1f55bdf..b3b8f08e91ad 100644
--- a/tools/testing/selftests/kvm/memslot_modification_stress_test.c
+++ b/tools/testing/selftests/kvm/memslot_modification_stress_test.c
@@ -123,7 +123,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
 			   p->nr_memslot_modifications,
 			   perf_test_args.gpa +
 			   (guest_percpu_mem_size * nr_vcpus) +
-			   perf_test_args.host_page_size +
+			   getpagesize() +
 			   perf_test_args.guest_page_size);
 
 	run_vcpus = false;
-- 
2.30.0.478.g8a0d178c01-goog