Message-ID: <20250929010321.3462457-15-pasha.tatashin@soleen.com>
Date: Mon, 29 Sep 2025 01:03:05 +0000
From: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: [PATCH v4 14/30] liveupdate: luo_session: Add ioctls for file preservation and state management

Introducing the userspace interface and internal logic required to
manage the lifecycle of file descriptors within a session. Previously, a
session was merely a container; this change makes it a functional
management unit.

The following capabilities are added:

A new set of ioctl commands are added, which operate on the file
descriptor returned by CREATE_SESSION. This allows userspace to:
- LIVEUPDATE_SESSION_PRESERVE_FD: Add a file descriptor to a session
  to be preserved across the live update.
- LIVEUPDATE_SESSION_UNPRESERVE_FD: Remove a previously added file
  descriptor from the session.
- LIVEUPDATE_SESSION_RESTORE_FD: Retrieve a preserved file in the
  new kernel using its unique token.

A state machine for each individual session, distinct from the global
LUO state. This enables more granular control, allowing userspace to
prepare or freeze specific sessions independently. This is managed via:
- LIVEUPDATE_SESSION_SET_EVENT: An ioctl to send PREPARE, FREEZE,
  CANCEL, or FINISH events to a single session.
- LIVEUPDATE_SESSION_GET_STATE: An ioctl to query the current state
  of a single session.

The global subsystem callbacks (luo_session_prepare, luo_session_freeze)
are updated to iterate through all existing sessions. They now trigger
the appropriate per-session state transitions for any sessions that
haven't already been transitioned individually by userspace.

The session's .release handler is enhanced to be state-aware. When a
session's file descriptor is closed, it now correctly cancels or
finishes the session based on its current state before freeing all
associated file resources, preventing resource leaks.

Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
 include/uapi/linux/liveupdate.h | 164 ++++++++++++++++++
 kernel/liveupdate/luo_session.c | 284 +++++++++++++++++++++++++++++++-
 2 files changed, 446 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/liveupdate.h b/include/uapi/linux/liveupdate.h
index 2e38ef3094aa..59a0f561d148 100644
--- a/include/uapi/linux/liveupdate.h
+++ b/include/uapi/linux/liveupdate.h
@@ -132,6 +132,16 @@ enum {
 	LIVEUPDATE_CMD_RETRIEVE_SESSION = 0x03,
 };
 
+/* ioctl commands for session file descriptors */
+enum {
+	LIVEUPDATE_CMD_SESSION_BASE = 0x40,
+	LIVEUPDATE_CMD_SESSION_PRESERVE_FD = LIVEUPDATE_CMD_SESSION_BASE,
+	LIVEUPDATE_CMD_SESSION_UNPRESERVE_FD = 0x41,
+	LIVEUPDATE_CMD_SESSION_RESTORE_FD = 0x42,
+	LIVEUPDATE_CMD_SESSION_GET_STATE = 0x43,
+	LIVEUPDATE_CMD_SESSION_SET_EVENT = 0x44,
+};
+
 /**
  * struct liveupdate_ioctl_get_state - ioctl(LIVEUPDATE_IOCTL_GET_STATE)
  * @size:  Input; sizeof(struct liveupdate_ioctl_get_state)
@@ -293,4 +303,158 @@ struct liveupdate_ioctl_retrieve_session {
 
 #define LIVEUPDATE_IOCTL_RETRIEVE_SESSION \
 	_IO(LIVEUPDATE_IOCTL_TYPE, LIVEUPDATE_CMD_RETRIEVE_SESSION)
+
+/* Session specific IOCTLs */
+
+/**
+ * struct liveupdate_session_preserve_fd - ioctl(LIVEUPDATE_SESSION_PRESERVE_FD)
+ * @size:  Input; sizeof(struct liveupdate_session_preserve_fd)
+ * @fd:    Input; The user-space file descriptor to be preserved.
+ * @token: Input; An opaque, unique token for preserved resource.
+ *
+ * Holds parameters for preserving Validate and initiate preservation for a file
+ * descriptor.
+ *
+ * User sets the @fd field identifying the file descriptor to preserve
+ * (e.g., memfd, kvm, iommufd, VFIO). The kernel validates if this FD type
+ * and its dependencies are supported for preservation. If validation passes,
+ * the kernel marks the FD internally and *initiates the process* of preparing
+ * its state for saving. The actual snapshotting of the state typically occurs
+ * during the subsequent %LIVEUPDATE_IOCTL_PREPARE execution phase, though
+ * some finalization might occur during freeze.
+ * On successful validation and initiation, the kernel uses the @token
+ * field with an opaque identifier representing the resource being preserved.
+ * This token confirms the FD is targeted for preservation and is required for
+ * the subsequent %LIVEUPDATE_SESSION_RESTORE_FD call after the live update.
+ *
+ * Return: 0 on success (validation passed, preservation initiated), negative
+ * error code on failure (e.g., unsupported FD type, dependency issue,
+ * validation failed).
+ */
+struct liveupdate_session_preserve_fd {
+	__u32		size;
+	__s32		fd;
+	__aligned_u64	token;
+};
+
+#define LIVEUPDATE_SESSION_PRESERVE_FD					\
+	_IO(LIVEUPDATE_IOCTL_TYPE, LIVEUPDATE_CMD_SESSION_PRESERVE_FD)
+
+/**
+ * struct liveupdate_session_unpreserve_FD - ioctl(LIVEUPDATE_SESSION_UNPRESERVE_FD)
+ * @size:     Input; sizeof(struct liveupdate_session_unpreserve_fd)
+ * @reserved: Must be zero.
+ * @token:    Input; A token for resource to be unpreserved.
+ *
+ * Remove a file descriptor from the preservation list.
+ *
+ * Allows user space to explicitly remove a file descriptor from the set of
+ * items marked as potentially preservable. User space provides a @token that
+ * was previously used by a successful %LIVEUPDATE_SESSION_PRESERVE_FD call
+ * (potentially from a prior, possibly canceled, live update attempt). The
+ * kernel reads the token value from the provided user-space address.
+ *
+ * On success, the kernel removes the corresponding entry (identified by the
+ * token value read from the user pointer) from its internal preservation list.
+ * The provided @token (representing the now-removed entry) becomes invalid
+ * after this call.
+ *
+ * Return: 0 on success, negative error code on failure (e.g., -EBUSY or -EINVAL
+ * if bad address provided, invalid token value read, token not found).
+ */
+struct liveupdate_session_unpreserve_fd {
+	__u32		size;
+	__u32		reserved;
+	__aligned_u64	token;
+};
+
+#define LIVEUPDATE_SESSION_UNPRESERVE_FD				\
+	_IO(LIVEUPDATE_IOCTL_TYPE, LIVEUPDATE_CMD_SESSION_UNPRESERVE_FD)
+
+/**
+ * struct liveupdate_session_restore_fd - ioctl(LIVEUPDATE_SESSION_RESTORE_FD)
+ * @size:  Input; sizeof(struct liveupdate_session_restore_fd)
+ * @fd:    Output; The new file descriptor representing the fully restored
+ *         kernel resource.
+ * @token: Input; An opaque, token that was used to preserve the resource.
+ *
+ * Restore a previously preserved file descriptor.
+ *
+ * User sets the @token field to the value obtained from a successful
+ * %LIVEUPDATE_IOCTL_FD_PRESERVE call before the live update. On success,
+ * the kernel restores the state (saved during the PREPARE/FREEZE phases)
+ * associated with the token and populates the @fd field with a new file
+ * descriptor referencing the restored resource in the current (new) kernel.
+ * This operation must be performed *before* signaling completion via
+ * %LIVEUPDATE_IOCTL_FINISH.
+ *
+ * Return: 0 on success, negative error code on failure (e.g., invalid token).
+ */
+struct liveupdate_session_restore_fd {
+	__u32		size;
+	__s32		fd;
+	__aligned_u64	token;
+};
+
+#define LIVEUPDATE_SESSION_RESTORE_FD					\
+	_IO(LIVEUPDATE_IOCTL_TYPE, LIVEUPDATE_CMD_SESSION_RESTORE_FD)
+
+/**
+ * struct liveupdate_session_get_state - ioctl(LIVEUPDATE_SESSION_GET_STATE)
+ * @size:     Input; sizeof(struct liveupdate_session_get_state)
+ * @incoming: Input; If 1, query the state of a restored file from the incoming
+ *            (previous kernel's) set. If 0, query a file being prepared for
+ *            preservation in the current set.
+ * @reserved: Must be zero.
+ * @state:    Output; The live update state of this FD.
+ *
+ * Query the current live update state of a specific preserved file descriptor.
+ *
+ * - %LIVEUPDATE_STATE_NORMAL:   Default state
+ * - %LIVEUPDATE_STATE_PREPARED: Prepare callback has been performed on this FD.
+ * - %LIVEUPDATE_STATE_FROZEN:   Freeze callback ahs been performed on this FD.
+ * - %LIVEUPDATE_STATE_UPDATED:  The system has successfully rebooted into the
+ *                               new kernel.
+ *
+ * See the definition of &enum liveupdate_state for more details on each state.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+struct liveupdate_session_get_state {
+	__u32		size;
+	__u8		incoming;
+	__u8		reserved[3];
+	__u32		state;
+};
+
+#define LIVEUPDATE_SESSION_GET_STATE					\
+	_IO(LIVEUPDATE_IOCTL_TYPE, LIVEUPDATE_CMD_SESSION_GET_STATE)
+
+/**
+ * struct liveupdate_session_set_event - ioctl(LIVEUPDATE_SESSION_SET_EVENT)
+ * @size:  Input; sizeof(struct liveupdate_session_set_event)
+ * @event: Input; The live update event.
+ *
+ * Notify a specific preserved file descriptor of an event, that causes a state
+ * transition for that file descriptor.
+ *
+ * Event, can be one of the following:
+ *
+ * - %LIVEUPDATE_PREPARE: Initiates the FD live update preparation phase.
+ * - %LIVEUPDATE_FREEZE:  Initiates the FD live update freeze phase.
+ * - %LIVEUPDATE_CANCEL:  Cancel the FD preparation or freeze phase.
+ * - %LIVEUPDATE_FINISH:  FD Restoration completion and trigger cleanup.
+ *
+ * See the definition of &enum liveupdate_event for more details on each state.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+struct liveupdate_session_set_event {
+	__u32		size;
+	__u32		event;
+};
+
+#define LIVEUPDATE_SESSION_SET_EVENT					\
+	_IO(LIVEUPDATE_IOCTL_TYPE, LIVEUPDATE_CMD_SESSION_SET_EVENT)
+
 #endif /* _UAPI_LIVEUPDATE_H */
diff --git a/kernel/liveupdate/luo_session.c b/kernel/liveupdate/luo_session.c
index 74dee42e24b7..966b68532d79 100644
--- a/kernel/liveupdate/luo_session.c
+++ b/kernel/liveupdate/luo_session.c
@@ -188,17 +188,66 @@ static void luo_session_remove(struct luo_session *session)
 /* One session switches from the updated state to  normal state */
 static void luo_session_finish_one(struct luo_session *session)
 {
+	scoped_guard(mutex, &session->mutex) {
+		if (session->state != LIVEUPDATE_STATE_UPDATED)
+			return;
+		luo_file_finish(session);
+		session->files = 0;
+		luo_file_unpreserve_unreclaimed_files(session);
+		session->state = LIVEUPDATE_STATE_NORMAL;
+	}
 }
 
 /* Cancel one session from frozen or prepared state, back to normal */
 static void luo_session_cancel_one(struct luo_session *session)
 {
+	guard(mutex)(&session->mutex);
+	if (session->state == LIVEUPDATE_STATE_FROZEN ||
+	    session->state == LIVEUPDATE_STATE_PREPARED) {
+		luo_file_cancel(session);
+		session->state = LIVEUPDATE_STATE_NORMAL;
+		session->files = 0;
+		session->ser = NULL;
+	}
 }
 
 /* One session is changed from normal to prepare state */
 static int luo_session_prepare_one(struct luo_session *session)
 {
-	return 0;
+	int ret;
+
+	guard(mutex)(&session->mutex);
+	if (session->state != LIVEUPDATE_STATE_NORMAL)
+		return -EBUSY;
+
+	ret = luo_file_prepare(session);
+	if (!ret)
+		session->state = LIVEUPDATE_STATE_PREPARED;
+
+	return ret;
+}
+
+/* One session is changed from prepared to frozen state */
+static int luo_session_freeze_one(struct luo_session *session)
+{
+	int ret;
+
+	guard(mutex)(&session->mutex);
+	if (session->state != LIVEUPDATE_STATE_PREPARED)
+		return -EBUSY;
+
+	ret = luo_file_freeze(session);
+
+	/*
+	 * If fail, freeze is cancel, and as a side effect, we go back to normal
+	 * state
+	 */
+	if (!ret)
+		session->state = LIVEUPDATE_STATE_FROZEN;
+	else
+		session->state = LIVEUPDATE_STATE_NORMAL;
+
+	return ret;
 }
 
 static int luo_session_release(struct inode *inodep, struct file *filep)
@@ -220,6 +269,8 @@ static int luo_session_release(struct inode *inodep, struct file *filep)
 	    session->state == LIVEUPDATE_STATE_FROZEN) {
 		luo_session_cancel_one(session);
 	}
+	scoped_guard(mutex, &session->mutex)
+		luo_file_unpreserve_all_files(session);
 
 	scoped_guard(rwsem_write, &luo_session_global.rwsem)
 		luo_session_remove(session);
@@ -228,9 +279,219 @@ static int luo_session_release(struct inode *inodep, struct file *filep)
 	return 0;
 }
 
+static int luo_session_preserve_fd(struct luo_session *session,
+				   struct luo_ucmd *ucmd)
+{
+	struct liveupdate_session_preserve_fd *argp = ucmd->cmd;
+	int ret;
+
+	guard(rwsem_read)(&luo_state_rwsem);
+	if (!liveupdate_state_normal() && !liveupdate_state_updated()) {
+		pr_warn("File can be preserved only in normal or updated state\n");
+		return -EBUSY;
+	}
+
+	guard(mutex)(&session->mutex);
+
+	if (session->state != LIVEUPDATE_STATE_NORMAL)
+		return -EBUSY;
+
+	ret = luo_preserve_file(session, argp->token, argp->fd);
+	if (ret)
+		return ret;
+
+	ret = luo_ucmd_respond(ucmd, sizeof(*argp));
+	if (ret)
+		pr_warn("The file was successfully preserved, but response to user failed\n");
+
+	return ret;
+}
+
+static int luo_session_unpreserve_fd(struct luo_session *session,
+				     struct luo_ucmd *ucmd)
+{
+	struct liveupdate_session_unpreserve_fd *argp = ucmd->cmd;
+	int ret;
+
+	if (argp->reserved)
+		return -EOPNOTSUPP;
+
+	guard(rwsem_read)(&luo_state_rwsem);
+	if (!liveupdate_state_normal() && !liveupdate_state_updated()) {
+		pr_warn("File can be preserved only in normal or updated state\n");
+		return -EBUSY;
+	}
+
+	guard(mutex)(&session->mutex);
+
+	if (session->state != LIVEUPDATE_STATE_NORMAL)
+		return -EBUSY;
+
+	ret = luo_unpreserve_file(session, argp->token);
+	if (ret)
+		return ret;
+
+	ret = luo_ucmd_respond(ucmd, sizeof(*argp));
+	if (ret)
+		pr_warn("The file was successfully unpreserved, but response to user failed\n");
+
+	return ret;
+}
+
+static int luo_session_restore_fd(struct luo_session *session,
+				  struct luo_ucmd *ucmd)
+{
+	struct liveupdate_session_restore_fd *argp = ucmd->cmd;
+	struct file *file;
+	int ret;
+
+	guard(rwsem_read)(&luo_state_rwsem);
+	if (!liveupdate_state_updated())
+		return -EBUSY;
+
+	argp->fd = get_unused_fd_flags(O_CLOEXEC);
+	if (argp->fd < 0)
+		return argp->fd;
+
+	guard(mutex)(&session->mutex);
+
+	/* Session might have already finished independatly from global state */
+	if (session->state != LIVEUPDATE_STATE_UPDATED)
+		return -EBUSY;
+
+	ret = luo_retrieve_file(session, argp->token, &file);
+	if (ret < 0) {
+		put_unused_fd(argp->fd);
+
+		return ret;
+	}
+
+	ret = luo_ucmd_respond(ucmd, sizeof(*argp));
+	if (ret)
+		return ret;
+
+	fd_install(argp->fd, file);
+
+	return 0;
+}
+
+static int luo_session_get_state(struct luo_session *session,
+				 struct luo_ucmd *ucmd)
+{
+	struct liveupdate_session_get_state *argp = ucmd->cmd;
+
+	if (argp->reserved[0] | argp->reserved[1] | argp->reserved[2])
+		return -EOPNOTSUPP;
+
+	argp->state = READ_ONCE(session->state);
+
+	return luo_ucmd_respond(ucmd, sizeof(*argp));
+}
+
+static int luo_session_set_event(struct luo_session *session,
+				 struct luo_ucmd *ucmd)
+{
+	struct liveupdate_session_set_event *argp = ucmd->cmd;
+	int ret = 0;
+
+	switch (argp->event) {
+	case LIVEUPDATE_PREPARE:
+		ret = luo_session_prepare_one(session);
+		break;
+	case LIVEUPDATE_FREEZE:
+		ret = luo_session_freeze_one(session);
+		break;
+	case LIVEUPDATE_FINISH:
+		luo_session_finish_one(session);
+		break;
+	case LIVEUPDATE_CANCEL:
+		luo_session_cancel_one(session);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+union ucmd_buffer {
+	struct liveupdate_session_get_state state;
+	struct liveupdate_session_preserve_fd preserve;
+	struct liveupdate_session_restore_fd restore;
+	struct liveupdate_session_set_event event;
+	struct liveupdate_session_unpreserve_fd unpreserve;
+};
+
+struct luo_ioctl_op {
+	unsigned int size;
+	unsigned int min_size;
+	unsigned int ioctl_num;
+	int (*execute)(struct luo_session *session, struct luo_ucmd *ucmd);
+};
+
+#define IOCTL_OP(_ioctl, _fn, _struct, _last)                                  \
+	[_IOC_NR(_ioctl) - LIVEUPDATE_CMD_SESSION_BASE] = {                    \
+		.size = sizeof(_struct) +                                      \
+			BUILD_BUG_ON_ZERO(sizeof(union ucmd_buffer) <          \
+					  sizeof(_struct)),                    \
+		.min_size = offsetofend(_struct, _last),                       \
+		.ioctl_num = _ioctl,                                           \
+		.execute = _fn,                                                \
+	}
+
+static const struct luo_ioctl_op luo_session_ioctl_ops[] = {
+	IOCTL_OP(LIVEUPDATE_SESSION_GET_STATE, luo_session_get_state,
+		 struct liveupdate_session_get_state, state),
+	IOCTL_OP(LIVEUPDATE_SESSION_PRESERVE_FD, luo_session_preserve_fd,
+		 struct liveupdate_session_preserve_fd, token),
+	IOCTL_OP(LIVEUPDATE_SESSION_RESTORE_FD, luo_session_restore_fd,
+		 struct liveupdate_session_restore_fd, token),
+	IOCTL_OP(LIVEUPDATE_SESSION_SET_EVENT, luo_session_set_event,
+		 struct liveupdate_session_set_event, event),
+	IOCTL_OP(LIVEUPDATE_SESSION_UNPRESERVE_FD, luo_session_unpreserve_fd,
+		 struct liveupdate_session_unpreserve_fd, token),
+};
+
+static long luo_session_ioctl(struct file *filep, unsigned int cmd,
+			      unsigned long arg)
+{
+	struct luo_session *session = filep->private_data;
+	const struct luo_ioctl_op *op;
+	struct luo_ucmd ucmd = {};
+	union ucmd_buffer buf;
+	unsigned int nr;
+	int ret;
+
+	nr = _IOC_NR(cmd);
+	if (nr < LIVEUPDATE_CMD_SESSION_BASE || (nr - LIVEUPDATE_CMD_SESSION_BASE) >=
+	    ARRAY_SIZE(luo_session_ioctl_ops)) {
+		return -EINVAL;
+	}
+
+	ucmd.ubuffer = (void __user *)arg;
+	ret = get_user(ucmd.user_size, (u32 __user *)ucmd.ubuffer);
+	if (ret)
+		return ret;
+
+	op = &luo_session_ioctl_ops[nr - LIVEUPDATE_CMD_SESSION_BASE];
+	if (op->ioctl_num != cmd)
+		return -ENOIOCTLCMD;
+	if (ucmd.user_size < op->min_size)
+		return -EINVAL;
+
+	ucmd.cmd = &buf;
+	ret = copy_struct_from_user(ucmd.cmd, op->size, ucmd.ubuffer,
+				    ucmd.user_size);
+	if (ret)
+		return ret;
+
+	return op->execute(session, &ucmd);
+}
+
 static const struct file_operations luo_session_fops = {
 	.owner = THIS_MODULE,
 	.release = luo_session_release,
+	.unlocked_ioctl = luo_session_ioctl,
 };
 
 static void luo_session_deserialize(void)
@@ -267,6 +528,7 @@ static void luo_session_deserialize(void)
 		session->state = LIVEUPDATE_STATE_UPDATED;
 		session->count = luo_session_global.ser[i].count;
 		session->files = luo_session_global.ser[i].files;
+		luo_file_deserialize(session);
 	}
 }
 
@@ -501,7 +763,25 @@ static int luo_session_prepare(struct liveupdate_subsystem *h, u64 *data)
 
 static int luo_session_freeze(struct liveupdate_subsystem *h, u64 *data)
 {
-	return 0;
+	struct luo_session *it;
+	int ret;
+
+	WARN_ON(!luo_session_global.fdt);
+
+	scoped_guard(rwsem_read, &luo_session_global.rwsem) {
+		list_for_each_entry(it, &luo_session_global.list, list) {
+			if (it->state == LIVEUPDATE_STATE_PREPARED) {
+				ret = luo_session_freeze_one(it);
+				if (ret)
+					break;
+			}
+		}
+	}
+
+	if (ret)
+		luo_session_cancel(h, 0);
+
+	return ret;
 }
 
 /*
-- 
2.51.0.536.g15c5d4f767-goog

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