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Subject[PATCH v8 12/28] gunyah: vm_mgr: Introduce basic VM Manager
Date
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/Kconfig | 11 ++
drivers/virt/gunyah/Makefile | 1 +
drivers/virt/gunyah/rsc_mgr.c | 47 ++++++-
drivers/virt/gunyah/vm_mgr.c | 115 ++++++++++++++++++
drivers/virt/gunyah/vm_mgr.h | 25 ++++
include/linux/gunyah_rsc_mgr.h | 3 +
include/uapi/linux/gunyah.h | 23 ++++
8 files changed, 225 insertions(+), 1 deletion(-)
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..81456c34c85d 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' 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/Kconfig b/drivers/virt/gunyah/Kconfig
index 4a6189dedab2..5e5a329c9866 100644
--- a/drivers/virt/gunyah/Kconfig
+++ b/drivers/virt/gunyah/Kconfig
@@ -23,4 +23,15 @@ config GUNYAH_RESOURCE_MANAGER
Gunyah wanting to have Gunyah-awareness.

Say Y/M here if unsure.
+
+config GUNYAH_VM_MANAGER
+ bool "Manage Gunyah Virtual Machines"
+ depends on MAILBOX
+ depends on GUNYAH_RESOURCE_MANAGER
+ help
+ Gunyah VM manager exposes an interface to Gunyah userspace to load,
+ run, and interact with other Gunyah virtual machines. This option is
+ required to launch other virtual machines.
+
+ Say Y here if unsure and you want to support Gunyah VMMs.
endif
diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
index 5caa05267a58..e817ae6deddc 100644
--- a/drivers/virt/gunyah/Makefile
+++ b/drivers/virt/gunyah/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_GUNYAH) += gunyah.o

gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o
+gunyah_rsc_mgr-$(CONFIG_GUNYAH_VM_MANAGER) += vm_mgr.o
obj-$(CONFIG_GUNYAH_RESOURCE_MANAGER) += gunyah_rsc_mgr.o
diff --git a/drivers/virt/gunyah/rsc_mgr.c b/drivers/virt/gunyah/rsc_mgr.c
index 6b281576f5af..49d7939bbe36 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"

/* Resource Manager Header */
struct gh_rm_rpc_hdr {
@@ -96,6 +98,7 @@ struct gh_rm_rpc {

struct mutex send_lock;

+ struct miscdevice miscdev;
struct work_struct recv_work;
};

@@ -496,6 +499,33 @@ int gh_rm_call(struct gh_rm_rpc *rsc_mgr, u32 message_id, void *req_buff, size_t
return ret;
}

+void get_gh_rm(struct gh_rm_rpc *rm)
+{
+ get_device(rm->dev);
+}
+EXPORT_SYMBOL_GPL(get_gh_rm);
+
+void put_gh_rm(struct gh_rm_rpc *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_rpc *rm = container_of(miscdev, struct gh_rm_rpc, 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,
u8 gh_type, int idx, struct gunyah_resource *ghrsc)
{
@@ -550,14 +580,29 @@ static int gh_rm_drv_probe(struct platform_device *pdev)
rsc_mgr->msgq_client.rx_callback = gh_rm_msgq_rx_data;
rsc_mgr->msgq_client.tx_done = gh_rm_msgq_tx_done;

- return gh_msgq_init(&pdev->dev, &rsc_mgr->msgq, &rsc_mgr->msgq_client,
+ ret = gh_msgq_init(&pdev->dev, &rsc_mgr->msgq, &rsc_mgr->msgq_client,
&rsc_mgr->tx_ghrsc, &rsc_mgr->rx_ghrsc);
+
+ rsc_mgr->miscdev.name = "gunyah";
+ rsc_mgr->miscdev.minor = MISC_DYNAMIC_MINOR;
+ rsc_mgr->miscdev.fops = &gh_dev_fops;
+
+ ret = misc_register(&rsc_mgr->miscdev);
+ if (ret)
+ goto err_msgq;
+
+ return 0;
+err_msgq:
+ mbox_free_channel(gh_msgq_chan(&rsc_mgr->msgq));
+ gh_msgq_remove(&rsc_mgr->msgq);
+ return ret;
}

static int gh_rm_drv_remove(struct platform_device *pdev)
{
struct gh_rm_rpc *rm = platform_get_drvdata(pdev);

+ misc_deregister(&rm->miscdev);
mbox_free_channel(gh_msgq_chan(&rm->msgq));
gh_msgq_remove(&rm->msgq);

diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c
new file mode 100644
index 000000000000..9c796e5edcf1
--- /dev/null
+++ b/drivers/virt/gunyah/vm_mgr.c
@@ -0,0 +1,115 @@
+// 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(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)
+ 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_rpc *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_rpc *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..84e3d1a8571d
--- /dev/null
+++ b/drivers/virt/gunyah/vm_mgr.h
@@ -0,0 +1,25 @@
+/* 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>
+
+#if IS_ENABLED(CONFIG_GUNYAH_VM_MANAGER)
+long gh_dev_vm_mgr_ioctl(struct gh_rm_rpc *rm, unsigned int cmd, unsigned long arg);
+#else
+static inline long gh_dev_vm_mgr_ioctl(struct gh_rm_rpc *rm, unsigned int cmd, unsigned long arg)
+ { return -ENOIOCTLCMD; }
+#endif
+
+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 eb94b48c41de..9c566436687d 100644
--- a/include/linux/gunyah_rsc_mgr.h
+++ b/include/linux/gunyah_rsc_mgr.h
@@ -17,6 +17,9 @@

struct gh_rm_rpc;

+void get_gh_rm(struct gh_rm_rpc *rm);
+void put_gh_rm(struct gh_rm_rpc *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
--
2.25.1
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