[PATCH v9 11/27] gunyah: vm_mgr: Introduce basic VM Manager

[Elliot Berman <quic_eberman@quicinc.com>]

Gunyah VM manager is a kernel moduel which exposes an interface to
Gunyah userspace to load, run, and interact with other Gunyah virtual
machines. The interface is a character device at /dev/gunyah.

Add a basic VM manager driver. Upcoming patches will add more ioctls
into this driver.

Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
 .../userspace-api/ioctl/ioctl-number.rst      |   1 +
 drivers/virt/gunyah/Makefile                  |   2 +-
 drivers/virt/gunyah/rsc_mgr.c                 |  51 +++++++-
 drivers/virt/gunyah/vm_mgr.c                  | 117 ++++++++++++++++++
 drivers/virt/gunyah/vm_mgr.h                  |  20 +++
 include/linux/gunyah_rsc_mgr.h                |   3 +
 include/uapi/linux/gunyah.h                   |  23 ++++
 7 files changed, 215 insertions(+), 2 deletions(-)
 create mode 100644 drivers/virt/gunyah/vm_mgr.c
 create mode 100644 drivers/virt/gunyah/vm_mgr.h
 create mode 100644 include/uapi/linux/gunyah.h

diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
index eb045fc495a4..8696dc3cdd83 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -137,6 +137,7 @@ Code  Seq#    Include File                                           Comments
 'F'   DD     video/sstfb.h                                           conflict!
 'G'   00-3F  drivers/misc/sgi-gru/grulib.h                           conflict!
 'G'   00-0F  xen/gntalloc.h, xen/gntdev.h                            conflict!
+'G'   00-0f  linux/gunyah.h                                          conflict!
 'H'   00-7F  linux/hiddev.h                                          conflict!
 'H'   00-0F  linux/hidraw.h                                          conflict!
 'H'   01     linux/mei.h                                             conflict!
diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
index de29769f2f3f..03951cf82023 100644
--- a/drivers/virt/gunyah/Makefile
+++ b/drivers/virt/gunyah/Makefile
@@ -2,5 +2,5 @@
 
 obj-$(CONFIG_GUNYAH) += gunyah.o
 
-gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o
+gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o
 obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o
diff --git a/drivers/virt/gunyah/rsc_mgr.c b/drivers/virt/gunyah/rsc_mgr.c
index 382f9943fd31..95f4aa928aaf 100644
--- a/drivers/virt/gunyah/rsc_mgr.c
+++ b/drivers/virt/gunyah/rsc_mgr.c
@@ -16,8 +16,10 @@
 #include <linux/completion.h>
 #include <linux/gunyah_rsc_mgr.h>
 #include <linux/platform_device.h>
+#include <linux/miscdevice.h>
 
 #include "rsc_mgr.h"
+#include "vm_mgr.h"
 
 #define RM_RPC_API_VERSION_MASK		GENMASK(3, 0)
 #define RM_RPC_HEADER_WORDS_MASK	GENMASK(7, 4)
@@ -105,6 +107,7 @@ struct gh_rm {
 	struct kmem_cache *cache;
 	struct mutex send_lock;
 
+	struct miscdevice miscdev;
 	struct work_struct recv_work;
 };
 
@@ -526,6 +529,33 @@ int gh_rm_call(struct gh_rm *rm, u32 message_id, void *req_buff, size_t req_buff
 	return ret;
 }
 
+void get_gh_rm(struct gh_rm *rm)
+{
+	get_device(rm->dev);
+}
+EXPORT_SYMBOL_GPL(get_gh_rm);
+
+void put_gh_rm(struct gh_rm *rm)
+{
+	put_device(rm->dev);
+}
+EXPORT_SYMBOL_GPL(put_gh_rm);
+
+static long gh_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct miscdevice *miscdev = filp->private_data;
+	struct gh_rm *rm = container_of(miscdev, struct gh_rm, miscdev);
+
+	return gh_dev_vm_mgr_ioctl(rm, cmd, arg);
+}
+
+static const struct file_operations gh_dev_fops = {
+	.owner		= THIS_MODULE,
+	.unlocked_ioctl	= gh_dev_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
+	.llseek		= noop_llseek,
+};
+
 static int gh_msgq_platform_probe_direction(struct platform_device *pdev,
 					bool tx, int idx, struct gunyah_resource *ghrsc)
 {
@@ -582,13 +612,32 @@ static int gh_rm_drv_probe(struct platform_device *pdev)
 	rm->msgq_client.rx_callback = gh_rm_msgq_rx_data;
 	rm->msgq_client.tx_done = gh_rm_msgq_tx_done;
 
-	return gh_msgq_init(&pdev->dev, &rm->msgq, &rm->msgq_client, &rm->tx_ghrsc, &rm->rx_ghrsc);
+	ret = gh_msgq_init(&pdev->dev, &rm->msgq, &rm->msgq_client, &rm->tx_ghrsc, &rm->rx_ghrsc);
+	if (ret)
+		goto err_cache;
+
+	rm->miscdev.name = "gunyah";
+	rm->miscdev.minor = MISC_DYNAMIC_MINOR;
+	rm->miscdev.fops = &gh_dev_fops;
+
+	ret = misc_register(&rm->miscdev);
+	if (ret)
+		goto err_msgq;
+
+	return 0;
+err_msgq:
+	mbox_free_channel(gh_msgq_chan(&rm->msgq));
+	gh_msgq_remove(&rm->msgq);
+err_cache:
+	kmem_cache_destroy(rm->cache);
+	return ret;
 }
 
 static int gh_rm_drv_remove(struct platform_device *pdev)
 {
 	struct gh_rm *rm = platform_get_drvdata(pdev);
 
+	misc_deregister(&rm->miscdev);
 	mbox_free_channel(gh_msgq_chan(&rm->msgq));
 	gh_msgq_remove(&rm->msgq);
 	kmem_cache_destroy(rm->cache);
diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c
new file mode 100644
index 000000000000..0864dbd77e28
--- /dev/null
+++ b/drivers/virt/gunyah/vm_mgr.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#define pr_fmt(fmt) "gh_vm_mgr: " fmt
+
+#include <linux/anon_inodes.h>
+#include <linux/file.h>
+#include <linux/gunyah_rsc_mgr.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+
+#include <uapi/linux/gunyah.h>
+
+#include "vm_mgr.h"
+
+static __must_check struct gunyah_vm *gunyah_vm_alloc(struct gh_rm_rpc *rm)
+{
+	struct gunyah_vm *ghvm;
+	int vmid;
+
+	vmid = gh_rm_alloc_vmid(rm, 0);
+	if (vmid < 0)
+		return ERR_PTR(vmid);
+
+	ghvm = kzalloc(sizeof(*ghvm), GFP_KERNEL);
+	if (!ghvm) {
+		gh_rm_dealloc_vmid(rm, vmid);
+		return ghvm;
+	}
+
+	get_gh_rm(rm);
+
+	ghvm->vmid = vmid;
+	ghvm->rm = rm;
+
+	return ghvm;
+}
+
+static long gh_vm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	long r;
+
+	switch (cmd) {
+	default:
+		r = -ENOTTY;
+		break;
+	}
+
+	return r;
+}
+
+static int gh_vm_release(struct inode *inode, struct file *filp)
+{
+	struct gunyah_vm *ghvm = filp->private_data;
+
+	put_gh_rm(ghvm->rm);
+	kfree(ghvm);
+	return 0;
+}
+
+static const struct file_operations gh_vm_fops = {
+	.unlocked_ioctl = gh_vm_ioctl,
+	.release = gh_vm_release,
+	.compat_ioctl	= compat_ptr_ioctl,
+	.llseek = noop_llseek,
+};
+
+static long gh_dev_ioctl_create_vm(struct gh_rm *rm, unsigned long arg)
+{
+	struct gunyah_vm *ghvm;
+	struct file *file;
+	int fd, err;
+
+	/* arg reserved for future use. */
+	if (arg)
+		return -EINVAL;
+
+	ghvm = gunyah_vm_alloc(rm);
+	if (IS_ERR_OR_NULL(ghvm))
+		return PTR_ERR(ghvm) ? : -ENOMEM;
+
+	fd = get_unused_fd_flags(O_CLOEXEC);
+	if (fd < 0) {
+		err = fd;
+		goto err_destroy_vm;
+	}
+
+	file = anon_inode_getfile("gunyah-vm", &gh_vm_fops, ghvm, O_RDWR);
+	if (IS_ERR(file)) {
+		err = PTR_ERR(file);
+		goto err_put_fd;
+	}
+
+	fd_install(fd, file);
+
+	return fd;
+
+err_put_fd:
+	put_unused_fd(fd);
+err_destroy_vm:
+	kfree(ghvm);
+	return err;
+}
+
+long gh_dev_vm_mgr_ioctl(struct gh_rm *rm, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case GH_CREATE_VM:
+		return gh_dev_ioctl_create_vm(rm, arg);
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+EXPORT_SYMBOL_GPL(gh_dev_vm_mgr_ioctl);
+
diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h
new file mode 100644
index 000000000000..e47f34de7f9e
--- /dev/null
+++ b/drivers/virt/gunyah/vm_mgr.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _GH_PRIV_VM_MGR_H
+#define _GH_PRIV_VM_MGR_H
+
+#include <linux/gunyah_rsc_mgr.h>
+
+#include <uapi/linux/gunyah.h>
+
+long gh_dev_vm_mgr_ioctl(struct gh_rm *rm, unsigned int cmd, unsigned long arg);
+
+struct gunyah_vm {
+	u16 vmid;
+	struct gh_rm_rpc *rm;
+};
+
+#endif
diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h
index be0bce5507b1..9a9a037b349a 100644
--- a/include/linux/gunyah_rsc_mgr.h
+++ b/include/linux/gunyah_rsc_mgr.h
@@ -17,6 +17,9 @@
 
 struct gh_rm;
 
+void get_gh_rm(struct gh_rm *rm);
+void put_gh_rm(struct gh_rm *rm);
+
 enum gh_rm_vm_status {
 	GH_RM_VM_STATUS_NO_STATE	= 0,
 	GH_RM_VM_STATUS_INIT		= 1,
diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h
new file mode 100644
index 000000000000..88a40d6e0b96
--- /dev/null
+++ b/include/uapi/linux/gunyah.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _UAPI_LINUX_GUNYAH
+#define _UAPI_LINUX_GUNYAH
+
+/*
+ * Userspace interface for /dev/gunyah - gunyah based virtual machine
+ */
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define GH_IOCTL_TYPE			'G'
+
+/*
+ * ioctls for /dev/gunyah fds:
+ */
+#define GH_CREATE_VM			_IO(GH_IOCTL_TYPE, 0x0) /* Returns a Gunyah VM fd */
+
+#endif
-- 
2.39.0


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