From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F40CC55181 for ; Tue, 21 Apr 2020 18:43:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E020B206F4 for ; Tue, 21 Apr 2020 18:43:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="BPFAjdJe" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729640AbgDUSn3 (ORCPT ); Tue, 21 Apr 2020 14:43:29 -0400 Received: from smtp-fw-33001.amazon.com ([207.171.190.10]:62436 "EHLO smtp-fw-33001.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729562AbgDUSn1 (ORCPT ); Tue, 21 Apr 2020 14:43:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1587494606; x=1619030606; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=3HnYBZCPpA+K5LQ93akasa4zhaILbgx153AkIWoMXFg=; b=BPFAjdJeOPRnOqNlbWcsUgVveavAS4RPjYU6Uzz/zeRSRVty712Bkwuh ElBWGQ7Lq6EUdJFyrUapL9lsX4ZKK8t7rIJ1KeurrCgP+RBJCP2DjYkMU 2ARCDaUx27wBWQQtGIeJA8vpwu1/ktOD1kbTNdvlxVBeSbVqcgtqRzBd1 A=; IronPort-SDR: KQLCPE4wIHrA2RmT9SQMuj1c8weUr9lG/uYzm3aJclaM5Vg4m0Q6ykEj/gn8Q8e/RDkfC3g3dI DwY07vFhlmJw== X-IronPort-AV: E=Sophos;i="5.72,411,1580774400"; d="scan'208";a="39978538" Received: from sea32-co-svc-lb4-vlan3.sea.corp.amazon.com (HELO email-inbound-relay-2b-859fe132.us-west-2.amazon.com) ([10.47.23.38]) by smtp-border-fw-out-33001.sea14.amazon.com with ESMTP; 21 Apr 2020 18:43:25 +0000 Received: from EX13MTAUEA002.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2b-859fe132.us-west-2.amazon.com (Postfix) with ESMTPS id 8FBAD226806; Tue, 21 Apr 2020 18:43:24 +0000 (UTC) Received: from EX13D16EUB003.ant.amazon.com (10.43.166.99) by EX13MTAUEA002.ant.amazon.com (10.43.61.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 21 Apr 2020 18:43:23 +0000 Received: from 38f9d34ed3b1.ant.amazon.com (10.43.160.90) by EX13D16EUB003.ant.amazon.com (10.43.166.99) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 21 Apr 2020 18:43:14 +0000 From: Andra Paraschiv To: CC: Anthony Liguori , Benjamin Herrenschmidt , Colm MacCarthaigh , Bjoern Doebel , David Woodhouse , Frank van der Linden , Alexander Graf , Martin Pohlack , Matt Wilson , Paolo Bonzini , Balbir Singh , Stewart Smith , Uwe Dannowski , , , Andra Paraschiv Subject: [PATCH v1 09/15] nitro_enclaves: Add logic for enclave vcpu creation Date: Tue, 21 Apr 2020 21:41:44 +0300 Message-ID: <20200421184150.68011-10-andraprs@amazon.com> X-Mailer: git-send-email 2.20.1 (Apple Git-117) In-Reply-To: <20200421184150.68011-1-andraprs@amazon.com> References: <20200421184150.68011-1-andraprs@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.43.160.90] X-ClientProxiedBy: EX13D37UWC004.ant.amazon.com (10.43.162.212) To EX13D16EUB003.ant.amazon.com (10.43.166.99) Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org An enclave, before being started, has its resources set. One of its resources is CPU. Add ioctl command logic for enclave vCPU creation. Return as result a file descriptor that is associated with the enclave vCPU. Signed-off-by: Alexandru Vasile Signed-off-by: Andra Paraschiv --- .../virt/amazon/nitro_enclaves/ne_misc_dev.c | 210 ++++++++++++++++++ 1 file changed, 210 insertions(+) diff --git a/drivers/virt/amazon/nitro_enclaves/ne_misc_dev.c b/drivers/virt/amazon/nitro_enclaves/ne_misc_dev.c index abbebc7718c2..c9acdfd63daf 100644 --- a/drivers/virt/amazon/nitro_enclaves/ne_misc_dev.c +++ b/drivers/virt/amazon/nitro_enclaves/ne_misc_dev.c @@ -60,6 +60,179 @@ static struct ne_cpu_pool ne_cpu_pool; static struct mutex ne_cpu_pool_mutex; +static int ne_enclave_vcpu_open(struct inode *node, struct file *file) +{ + return 0; +} + +static long ne_enclave_vcpu_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + switch (cmd) { + default: + return -ENOTTY; + } + + return 0; +} + +static int ne_enclave_vcpu_release(struct inode *inode, struct file *file) +{ + return 0; +} + +static const struct file_operations ne_enclave_vcpu_fops = { + .owner = THIS_MODULE, + .llseek = noop_llseek, + .unlocked_ioctl = ne_enclave_vcpu_ioctl, + .open = ne_enclave_vcpu_open, + .release = ne_enclave_vcpu_release, +}; + +/** + * ne_get_cpu_from_cpu_pool - Get a CPU from the CPU pool, if it is set. + * + * This function gets called with the ne_enclave mutex held. + * + * @ne_enclave: private data associated with the current enclave. + * @vcpu_id: id of the CPU to be associated with the given slot, apic id on x86. + * + * @returns: 0 on success, negative return value on failure. + */ +static int ne_get_cpu_from_cpu_pool(struct ne_enclave *ne_enclave, u32 *vcpu_id) +{ + unsigned int cpu = 0; + unsigned int cpu_sibling = 0; + + BUG_ON(!ne_enclave); + + if (WARN_ON(!vcpu_id)) + return -EINVAL; + + /* There are CPU siblings available to choose from. */ + cpu = cpumask_any(ne_enclave->cpu_siblings); + if (cpu < nr_cpu_ids) { + cpumask_clear_cpu(cpu, ne_enclave->cpu_siblings); + + *vcpu_id = cpu; + + return 0; + } + + mutex_lock(&ne_cpu_pool_mutex); + + /* Choose any CPU from the available CPU pool. */ + cpu = cpumask_any(ne_cpu_pool.avail); + if (cpu >= nr_cpu_ids) { + pr_err_ratelimited("No CPUs available in CPU pool\n"); + + mutex_unlock(&ne_cpu_pool_mutex); + + return -EINVAL; + } + + cpumask_clear_cpu(cpu, ne_cpu_pool.avail); + + /* + * Make sure the CPU siblings are not marked as + * available anymore. + */ + for_each_cpu(cpu_sibling, topology_sibling_cpumask(cpu)) { + if (cpu_sibling != cpu) { + cpumask_clear_cpu(cpu_sibling, ne_cpu_pool.avail); + + cpumask_set_cpu(cpu_sibling, ne_enclave->cpu_siblings); + } + } + + mutex_unlock(&ne_cpu_pool_mutex); + + *vcpu_id = cpu; + + return 0; +} + +/** + * ne_create_vcpu_ioctl - Add vCPU to the slot associated with the current + * enclave. Create vCPU file descriptor to be further used for CPU handling. + * + * This function gets called with the ne_enclave mutex held. + * + * @ne_enclave: private data associated with the current enclave. + * @vcpu_id: id of the CPU to be associated with the given slot, apic id on x86. + * + * @returns: vCPU fd on success, negative return value on failure. + */ +static int ne_create_vcpu_ioctl(struct ne_enclave *ne_enclave, u32 vcpu_id) +{ + struct ne_pci_dev_cmd_reply cmd_reply = {}; + int fd = 0; + struct file *file = NULL; + struct ne_vcpu_id *ne_vcpu_id = NULL; + int rc = -EINVAL; + struct slot_add_vcpu_req slot_add_vcpu_req = {}; + + BUG_ON(!ne_enclave); + BUG_ON(!ne_enclave->pdev); + + if (ne_enclave->mm != current->mm) + return -EIO; + + ne_vcpu_id = kzalloc(sizeof(*ne_vcpu_id), GFP_KERNEL); + if (!ne_vcpu_id) + return -ENOMEM; + + fd = get_unused_fd_flags(O_CLOEXEC); + if (fd < 0) { + rc = fd; + + pr_err_ratelimited("Failure in getting unused fd [rc=%d]\n", + rc); + + goto err_get_unused_fd; + } + + /* TODO: Include (vcpu) id in the ne-vm-vcpu naming. */ + file = anon_inode_getfile("ne-vm-vcpu", &ne_enclave_vcpu_fops, + ne_enclave, O_RDWR); + if (IS_ERR(file)) { + rc = PTR_ERR(file); + + pr_err_ratelimited("Failure in anon inode get file [rc=%d]\n", + rc); + + goto err_anon_inode_getfile; + } + + slot_add_vcpu_req.slot_uid = ne_enclave->slot_uid; + slot_add_vcpu_req.vcpu_id = vcpu_id; + + rc = ne_do_request(ne_enclave->pdev, SLOT_ADD_VCPU, &slot_add_vcpu_req, + sizeof(slot_add_vcpu_req), &cmd_reply, + sizeof(cmd_reply)); + if (rc < 0) { + pr_err_ratelimited("Failure in slot add vcpu [rc=%d]\n", rc); + + goto err_slot_add_vcpu; + } + + ne_vcpu_id->vcpu_id = vcpu_id; + + list_add(&ne_vcpu_id->vcpu_id_list_entry, &ne_enclave->vcpu_ids_list); + + fd_install(fd, file); + + return fd; + +err_slot_add_vcpu: + fput(file); +err_anon_inode_getfile: + put_unused_fd(fd); +err_get_unused_fd: + kzfree(ne_vcpu_id); + return rc; +} + static int ne_enclave_open(struct inode *node, struct file *file) { return 0; @@ -68,7 +241,44 @@ static int ne_enclave_open(struct inode *node, struct file *file) static long ne_enclave_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { + struct ne_enclave *ne_enclave = file->private_data; + + BUG_ON(!ne_enclave); + switch (cmd) { + case KVM_CREATE_VCPU: { + int rc = -EINVAL; + u32 vcpu_id = 0; + + if (copy_from_user(&vcpu_id, (void *)arg, sizeof(vcpu_id))) { + pr_err_ratelimited("Failure in copy from user\n"); + + return -EFAULT; + } + + mutex_lock(&ne_enclave->enclave_info_mutex); + + /* Use the CPU pool for choosing a CPU for the enclave. */ + rc = ne_get_cpu_from_cpu_pool(ne_enclave, &vcpu_id); + if (rc < 0) { + pr_err_ratelimited("Failure in get CPU from pool\n"); + + mutex_unlock(&ne_enclave->enclave_info_mutex); + + return -EINVAL; + } + + rc = ne_create_vcpu_ioctl(ne_enclave, vcpu_id); + + /* Put back the CPU in enclave cpu pool, if add vcpu error. */ + if (rc < 0) + cpumask_set_cpu(vcpu_id, ne_enclave->cpu_siblings); + + mutex_unlock(&ne_enclave->enclave_info_mutex); + + return rc; + } + default: return -ENOTTY; } -- 2.20.1 (Apple Git-117) Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. 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