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Subject[PATCH v2 09/18] nitro_enclaves: Add logic for enclave vcpu creation
Date
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 <lexnv@amazon.com>
Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
---
drivers/virt/nitro_enclaves/ne_misc_dev.c | 223 ++++++++++++++++++++++
1 file changed, 223 insertions(+)

diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.c b/drivers/virt/nitro_enclaves/ne_misc_dev.c
index 1036221238f4..8cf262ac1bbc 100644
--- a/drivers/virt/nitro_enclaves/ne_misc_dev.c
+++ b/drivers/virt/nitro_enclaves/ne_misc_dev.c
@@ -63,6 +63,183 @@ struct ne_cpu_pool {

static struct ne_cpu_pool ne_cpu_pool;

+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;
+
+ if (WARN_ON(!ne_enclave))
+ return -EINVAL;
+
+ if (!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(NE "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 = {};
+
+ if (WARN_ON(!ne_enclave) || WARN_ON(!ne_enclave->pdev))
+ return -EINVAL;
+
+ 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(NE "Error in getting unused fd [rc=%d]\n",
+ rc);
+
+ goto free_ne_vcpu_id;
+ }
+
+ /* 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(NE "Error in anon inode get file [rc=%d]\n",
+ rc);
+
+ goto put_fd;
+ }
+
+ 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(NE "Error in slot add vcpu [rc=%d]\n", rc);
+
+ goto put_file;
+ }
+
+ ne_vcpu_id->vcpu_id = vcpu_id;
+
+ list_add(&ne_vcpu_id->vcpu_id_list_entry, &ne_enclave->vcpu_ids_list);
+
+ ne_enclave->nr_vcpus++;
+
+ fd_install(fd, file);
+
+ return fd;
+
+put_file:
+ fput(file);
+put_fd:
+ put_unused_fd(fd);
+free_ne_vcpu_id:
+ kzfree(ne_vcpu_id);
+
+ return rc;
+}
+
static int ne_enclave_open(struct inode *node, struct file *file)
{
return 0;
@@ -71,7 +248,53 @@ 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;
+
+ if (WARN_ON(!ne_enclave))
+ return -EINVAL;
+
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(NE "Error in copy from user\n");
+
+ return -EFAULT;
+ }
+
+ mutex_lock(&ne_enclave->enclave_info_mutex);
+
+ if (ne_enclave->state != NE_STATE_INIT) {
+ pr_err_ratelimited(NE "Enclave isn't in init state\n");
+
+ mutex_unlock(&ne_enclave->enclave_info_mutex);
+
+ return -EINVAL;
+ }
+
+ /* 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(NE "Error 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)



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