linux-kernel - [RFC PATCH 17/19] KVM: selftests: Add basic selftests for hugetlbfs-backed guest

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Date:   Tue,  6 Jun 2023 19:04:02 +0000
From:   Ackerley Tng <ackerleytng@...gle.com>
To:     akpm@...ux-foundation.org, mike.kravetz@...cle.com,
        muchun.song@...ux.dev, pbonzini@...hat.com, seanjc@...gle.com,
        shuah@...nel.org, willy@...radead.org
Cc:     brauner@...nel.org, chao.p.peng@...ux.intel.com,
        coltonlewis@...gle.com, david@...hat.com, dhildenb@...hat.com,
        dmatlack@...gle.com, erdemaktas@...gle.com, hughd@...gle.com,
        isaku.yamahata@...il.com, jarkko@...nel.org, jmattson@...gle.com,
        joro@...tes.org, jthoughton@...gle.com, jun.nakajima@...el.com,
        kirill.shutemov@...ux.intel.com, liam.merwick@...cle.com,
        mail@...iej.szmigiero.name, mhocko@...e.com, michael.roth@....com,
        qperret@...gle.com, rientjes@...gle.com, rppt@...nel.org,
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        vbabka@...e.cz, vipinsh@...gle.com, vkuznets@...hat.com,
        wei.w.wang@...el.com, yu.c.zhang@...ux.intel.com,
        kvm@...r.kernel.org, linux-api@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
        qemu-devel@...gnu.org, x86@...nel.org,
        Ackerley Tng <ackerleytng@...gle.com>
Subject: [RFC PATCH 17/19] KVM: selftests: Add basic selftests for
 hugetlbfs-backed guest_mem

Add tests for 2MB and 1GB page sizes.

Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
 .../testing/selftests/kvm/guest_memfd_test.c  | 33 ++++++++++++++-----
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c
index 059b33cdecec..6e24631119c6 100644
--- a/tools/testing/selftests/kvm/guest_memfd_test.c
+++ b/tools/testing/selftests/kvm/guest_memfd_test.c
@@ -90,20 +90,14 @@ static void test_fallocate(int fd, size_t page_size, size_t total_size)
 	TEST_ASSERT(!ret, "fallocate to restore punched hole should succeed");
 }
 
-
-int main(int argc, char *argv[])
+void test_guest_mem(struct kvm_vm *vm, uint32_t flags, size_t page_size)
 {
-	size_t page_size;
-	size_t total_size;
 	int fd;
-	struct kvm_vm *vm;
+	size_t total_size;
 
-	page_size = getpagesize();
 	total_size = page_size * 4;
 
-	vm = vm_create_barebones();
-
-	fd = vm_create_guest_memfd(vm, total_size, 0);
+	fd = vm_create_guest_memfd(vm, total_size, flags);
 
 	test_file_read_write(fd);
 	test_mmap(fd, page_size);
@@ -112,3 +106,24 @@ int main(int argc, char *argv[])
 
 	close(fd);
 }
+
+int main(int argc, char *argv[])
+{
+	struct kvm_vm *vm = vm_create_barebones();
+
+	printf("Test guest mem 4K\n");
+	test_guest_mem(vm, 0, getpagesize());
+	printf("        PASSED\n");
+
+	printf("Test guest mem hugetlb 2M\n");
+	test_guest_mem(
+		vm, KVM_GUEST_MEMFD_HUGETLB | KVM_GUEST_MEMFD_HUGE_2MB, 2UL << 20);
+	printf("        PASSED\n");
+
+	printf("Test guest mem hugetlb 1G\n");
+	test_guest_mem(
+		vm, KVM_GUEST_MEMFD_HUGETLB | KVM_GUEST_MEMFD_HUGE_1GB, 1UL << 30);
+	printf("        PASSED\n");
+
+	return 0;
+}
-- 
2.41.0.rc0.172.g3f132b7071-goog