From patchwork Mon Mar 3 13:08:38 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikita Kalyazin X-Patchwork-Id: 869979 Received: from smtp-fw-52002.amazon.com (smtp-fw-52002.amazon.com [52.119.213.150]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4BD09211297; Mon, 3 Mar 2025 13:09:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=52.119.213.150 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741007375; cv=none; b=gkdp1CL1CjpFXt9foKVHb/z+cTaTwuErfPsVUiMhgb3goU+AAJx+zm+IrZj2HVE3xHuWnYeKsBFLWI2wlyj+KCz1nSDWYgMjLxAdSQ2pm6VCvWY8jC5bx9zx67sy7c8ahR2iVLa/9/xj0SF9/RHwj3v/MNk1XYwSDum7gVXoGwI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741007375; c=relaxed/simple; bh=Q1BGVztK8kR5/ZW+9TFXncK+fkh6xuxcZierK7FxuQk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=EiLnEerfY3exM4UVjv/pO+IEuNV+QWZdi5E5sVm07Y41git2Buu1DDLphzXo2eib6uCix524xN6YVZzj5BepzC35VnSF6p2d4xJU6gzg3eBsYS8YWbB++6SHOhdYtSiFQmr5EPCbpd1DH0ralKIEz44/SqFQo7bPvaUjPnxXTco= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.co.uk; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b=DZizKf0I; arc=none smtp.client-ip=52.119.213.150 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.co.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="DZizKf0I" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1741007374; x=1772543374; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=XKenNyKlzRx3KFaAkl7fAqp0QyjUeRzS8JHs+ogdzvo=; b=DZizKf0IR8cY2FWnmqzBNyo4Oz8uVIntq+ZuXoO6qcJJ9WRXU8KHIAwO lPXMM6U9lV0jPxyPP0xQpINO03QrMWWJbGW+irYo4LG7cb+cj7Zs8cYyl MzdKiwOrCEPQDK0MBkcddzEZvTwx5ZIgBSm8M7pjIBgC8RAIIoe7VR+Dw U=; X-IronPort-AV: E=Sophos;i="6.13,329,1732579200"; d="scan'208";a="701674208" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.43.8.6]) by smtp-border-fw-52002.iad7.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2025 13:09:11 +0000 Received: from EX19MTAUWA002.ant.amazon.com [10.0.38.20:55265] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.35.48:2525] with esmtp (Farcaster) id f7436fc3-0ba0-4ad2-aabb-25e5142b6a4d; Mon, 3 Mar 2025 13:09:09 +0000 (UTC) X-Farcaster-Flow-ID: f7436fc3-0ba0-4ad2-aabb-25e5142b6a4d Received: from EX19D020UWC004.ant.amazon.com (10.13.138.149) by EX19MTAUWA002.ant.amazon.com (10.250.64.202) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1544.14; Mon, 3 Mar 2025 13:09:05 +0000 Received: from EX19MTAUWC001.ant.amazon.com (10.250.64.145) by EX19D020UWC004.ant.amazon.com (10.13.138.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1544.14; Mon, 3 Mar 2025 13:09:05 +0000 Received: from email-imr-corp-prod-iad-1box-1a-6851662a.us-east-1.amazon.com (10.25.36.210) by mail-relay.amazon.com (10.250.64.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1544.14 via Frontend Transport; Mon, 3 Mar 2025 13:09:05 +0000 Received: from dev-dsk-kalyazin-1a-a12e27e2.eu-west-1.amazon.com (dev-dsk-kalyazin-1a-a12e27e2.eu-west-1.amazon.com [172.19.103.116]) by email-imr-corp-prod-iad-1box-1a-6851662a.us-east-1.amazon.com (Postfix) with ESMTPS id 2E5D640513; Mon, 3 Mar 2025 13:09:03 +0000 (UTC) From: Nikita Kalyazin To: , CC: , , , , , , , , , , , , , , , Subject: [v3 PATCH 2/2] KVM: selftests: update guest_memfd write tests Date: Mon, 3 Mar 2025 13:08:38 +0000 Message-ID: <20250303130838.28812-3-kalyazin@amazon.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250303130838.28812-1-kalyazin@amazon.com> References: <20250303130838.28812-1-kalyazin@amazon.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This is to reflect that the write syscall is now implemented for guest_memfd. Signed-off-by: Nikita Kalyazin --- .../testing/selftests/kvm/guest_memfd_test.c | 85 +++++++++++++++++-- 1 file changed, 79 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 38c501e49e0e..b07221aa54c9 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -20,18 +20,90 @@ #include "kvm_util.h" #include "test_util.h" -static void test_file_read_write(int fd) +static void test_file_read(int fd) { char buf[64]; TEST_ASSERT(read(fd, buf, sizeof(buf)) < 0, "read on a guest_mem fd should fail"); - TEST_ASSERT(write(fd, buf, sizeof(buf)) < 0, - "write on a guest_mem fd should fail"); TEST_ASSERT(pread(fd, buf, sizeof(buf), 0) < 0, "pread on a guest_mem fd should fail"); - TEST_ASSERT(pwrite(fd, buf, sizeof(buf), 0) < 0, - "pwrite on a guest_mem fd should fail"); +} + +static void test_file_write(int fd, size_t total_size) +{ + size_t page_size = getpagesize(); + void *buf = NULL; + int ret; + + ret = posix_memalign(&buf, page_size, total_size); + TEST_ASSERT_EQ(ret, 0); + + /* Check arguments correctness checks work as expected */ + + ret = pwrite(fd, buf, page_size - 1, 0); + TEST_ASSERT(ret == -1, "write unaligned count on a guest_mem fd should fail"); + TEST_ASSERT_EQ(errno, EINVAL); + + ret = pwrite(fd, buf, page_size, 1); + TEST_ASSERT(ret == -1, "write unaligned offset on a guest_mem fd should fail"); + TEST_ASSERT_EQ(errno, EINVAL); + + ret = pwrite(fd, buf, page_size, total_size); + TEST_ASSERT(ret == -1, "writing past the file size on a guest_mem fd should fail"); + TEST_ASSERT_EQ(errno, EINVAL); + + ret = pwrite(fd, NULL, page_size, 0); + TEST_ASSERT(ret == -1, "supplying a NULL buffer when writing a guest_mem fd should fail"); + TEST_ASSERT_EQ(errno, EINVAL); + + /* Check double population is not allowed */ + + ret = pwrite(fd, buf, page_size, 0); + TEST_ASSERT(ret == page_size, "page-aligned write on a guest_mem fd should succeed"); + + ret = pwrite(fd, buf, page_size, 0); + TEST_ASSERT(ret == -1, "write on already populated guest_mem fd should fail"); + TEST_ASSERT_EQ(errno, ENOSPC); + + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, page_size); + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) should succeed"); + + /* Check population is allowed again after punching a hole */ + + ret = pwrite(fd, buf, page_size, 0); + TEST_ASSERT(ret == page_size, "page-aligned write on a punched guest_mem fd should succeed"); + + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, page_size); + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) should succeed"); + + /* Check population of already allocated memory is allowed */ + + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, 0, page_size); + TEST_ASSERT(!ret, "fallocate with aligned offset and size should succeed"); + + ret = pwrite(fd, buf, page_size, 0); + TEST_ASSERT(ret == page_size, "write on a preallocated guest_mem fd should succeed"); + + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, page_size); + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) should succeed"); + + /* Check population works until an already populated page is encountered */ + + ret = pwrite(fd, buf, total_size, 0); + TEST_ASSERT(ret == total_size, "page-aligned write on a guest_mem fd should succeed"); + + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, page_size); + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) should succeed"); + + ret = pwrite(fd, buf, total_size, 0); + TEST_ASSERT(ret == page_size, "write on a guest_mem fd should not overwrite data"); + + ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, total_size); + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) should succeed"); + + + free(buf); } static void test_mmap_allowed(int fd, size_t total_size) @@ -233,7 +305,8 @@ void test_vm_type(unsigned long type, bool is_shared) fd = vm_create_guest_memfd(vm, total_size, 0); - test_file_read_write(fd); + test_file_read(fd); + test_file_write(fd, total_size); if (is_shared) test_mmap_allowed(fd, total_size);