[PATCH v6 13/21] gunyah: vm_mgr: Introduce basic VM Manager
From: Elliot Berman
Date: Wed Oct 26 2022 - 15:01:00 EST
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@xxxxxxxxxxx>
Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@xxxxxxxxxxx>
Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
---
.../userspace-api/ioctl/ioctl-number.rst | 1 +
drivers/virt/gunyah/Kconfig | 8 +
drivers/virt/gunyah/Makefile | 3 +
drivers/virt/gunyah/vm_mgr.c | 152 ++++++++++++++++++
drivers/virt/gunyah/vm_mgr.h | 17 ++
include/uapi/linux/gunyah.h | 23 +++
6 files changed, 204 insertions(+)
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 5f81e2a24a5c..1fa1a5877bd7 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -136,6 +136,7 @@ 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' 40-4f linux/gunyah.h
'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/Kconfig b/drivers/virt/gunyah/Kconfig
index 4de88d80aa7b..c5d239159118 100644
--- a/drivers/virt/gunyah/Kconfig
+++ b/drivers/virt/gunyah/Kconfig
@@ -25,3 +25,11 @@ config GUNYAH_RESORUCE_MANAGER
Say Y/M here if unsure.
+config GUNYAH_VM_MANAGER
+ tristate "Gunyah VM Manager"
+ depends on GUNYAH_RESORUCE_MANAGER
+ help
+ Gunyah VM manager is a kernel module which exposes an interface to
+ Gunyah userspace to load, run, and interact with other Gunyah
+ virtual machines. This module is required to launch other virtual
+ machines.
diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
index 09c1bbd28b48..a69b1e2273af 100644
--- a/drivers/virt/gunyah/Makefile
+++ b/drivers/virt/gunyah/Makefile
@@ -2,3 +2,6 @@ obj-$(CONFIG_GUNYAH) += gunyah.o
gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o rsc_mgr_bus.o
obj-$(CONFIG_GUNYAH_RESORUCE_MANAGER) += gunyah_rsc_mgr.o
+
+gunyah_vm_mgr-y += vm_mgr.o
+obj-$(CONFIG_GUNYAH_VM_MANAGER) += gunyah_vm_mgr.o
diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c
new file mode 100644
index 000000000000..c48853dba11d
--- /dev/null
+++ b/drivers/virt/gunyah/vm_mgr.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022 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(void)
+{
+ struct gunyah_vm *ghvm;
+ int ret;
+
+ ret = gh_rm_alloc_vmid(0);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ ghvm = kzalloc(sizeof(*ghvm), GFP_KERNEL);
+ if (!ghvm)
+ return ghvm;
+
+ ghvm->vmid = ret;
+
+ 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;
+
+ kfree(ghvm);
+ return 0;
+}
+
+static const struct file_operations gh_vm_fops = {
+ .unlocked_ioctl = gh_vm_ioctl,
+ .release = gh_vm_release,
+ .llseek = noop_llseek,
+};
+
+static long gh_dev_ioctl_create_vm(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();
+ 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;
+}
+
+static long gh_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case GH_CREATE_VM:
+ return gh_dev_ioctl_create_vm(arg);
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct file_operations gh_dev_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = gh_dev_ioctl,
+ .llseek = noop_llseek,
+};
+
+static struct miscdevice gh_dev = {
+ .name = "gunyah",
+ .minor = MISC_DYNAMIC_MINOR,
+ .fops = &gh_dev_fops,
+};
+
+static int vm_mgr_probe(struct device *dev)
+{
+ return misc_register(&gh_dev);
+}
+
+static int vm_mgr_remove(struct device *dev)
+{
+ misc_deregister(&gh_dev);
+
+ return 0;
+}
+
+static struct gunyah_rsc_mgr_device_id vm_mgr_ids[] = {
+ { .name = GH_RM_DEVICE_VM_MGR },
+ {}
+};
+MODULE_DEVICE_TABLE(gunyah_rsc_mgr, vm_mgr_ids);
+
+static struct gh_rm_driver vm_mgr_drv = {
+ .drv = {
+ .name = KBUILD_MODNAME,
+ .probe = vm_mgr_probe,
+ .remove = vm_mgr_remove,
+ },
+ .id_table = vm_mgr_ids,
+};
+module_gh_rm_driver(vm_mgr_drv);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Gunyah VM Manager");
+
diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h
new file mode 100644
index 000000000000..d306ff5eac82
--- /dev/null
+++ b/drivers/virt/gunyah/vm_mgr.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022 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>
+
+struct gunyah_vm {
+ u16 vmid;
+};
+
+#endif
diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h
new file mode 100644
index 000000000000..37ea6bd4c2fd
--- /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, 0x40) /* Returns a Gunyah VM fd */
+
+#endif
--
2.25.1