[PATCH v10 05/21] virt: geniezone: Add vm support
From: Yi-De Wu
Date: Fri Apr 12 2024 - 03:01:08 EST
From: "Yingshiuan Pan" <yingshiuan.pan@xxxxxxxxxxxx>
The VM component is responsible for setting up the capability and memory
management for the protected VMs. The capability is mainly about the
lifecycle control and boot context initialization.
Signed-off-by: Yingshiuan Pan <yingshiuan.pan@xxxxxxxxxxxx>
Signed-off-by: Jerry Wang <ze-yu.wang@xxxxxxxxxxxx>
Signed-off-by: Liju Chen <liju-clr.chen@xxxxxxxxxxxx>
Signed-off-by: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx>
---
MAINTAINERS | 1 +
arch/arm64/geniezone/gzvm_arch_common.h | 4 +
arch/arm64/geniezone/vm.c | 27 ++++++
drivers/virt/geniezone/Makefile | 2 +-
drivers/virt/geniezone/gzvm_main.c | 16 ++++
drivers/virt/geniezone/gzvm_vm.c | 107 ++++++++++++++++++++++++
include/linux/soc/mediatek/gzvm_drv.h | 27 ++++++
include/uapi/linux/gzvm.h | 25 ++++++
8 files changed, 208 insertions(+), 1 deletion(-)
create mode 100644 drivers/virt/geniezone/gzvm_vm.c
create mode 100644 include/uapi/linux/gzvm.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 709ecfbbd691..e2a6f3afc6fa 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9185,6 +9185,7 @@ F: Documentation/virt/geniezone/
F: arch/arm64/geniezone/
F: drivers/virt/geniezone/
F: include/linux/soc/mediatek/gzvm_drv.h
+F: include/uapi/linux/gzvm.h
GENWQE (IBM Generic Workqueue Card)
M: Frank Haverkamp <haver@xxxxxxxxxxxxx>
diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
index 660c7cf3fc18..60ee5ed2b39f 100644
--- a/arch/arm64/geniezone/gzvm_arch_common.h
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -9,6 +9,8 @@
#include <linux/arm-smccc.h>
enum {
+ GZVM_FUNC_CREATE_VM = 0,
+ GZVM_FUNC_DESTROY_VM = 1,
GZVM_FUNC_PROBE = 12,
NR_GZVM_FUNC,
};
@@ -19,6 +21,8 @@ enum {
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64, \
SMC_ENTITY_MTK, (GZVM_FUNCID_START + (func)))
+#define MT_HVC_GZVM_CREATE_VM GZVM_HCALL_ID(GZVM_FUNC_CREATE_VM)
+#define MT_HVC_GZVM_DESTROY_VM GZVM_HCALL_ID(GZVM_FUNC_DESTROY_VM)
#define MT_HVC_GZVM_PROBE GZVM_HCALL_ID(GZVM_FUNC_PROBE)
/**
diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
index dce933f0c122..8ee5490d604a 100644
--- a/arch/arm64/geniezone/vm.c
+++ b/arch/arm64/geniezone/vm.c
@@ -7,6 +7,7 @@
#include <linux/err.h>
#include <linux/uaccess.h>
+#include <linux/gzvm.h>
#include <linux/soc/mediatek/gzvm_drv.h>
#include "gzvm_arch_common.h"
@@ -61,3 +62,29 @@ int gzvm_arch_probe(void)
return 0;
}
+
+/**
+ * gzvm_arch_create_vm() - create vm
+ * @vm_type: VM type. Only supports Linux VM now.
+ *
+ * Return:
+ * * positive value - VM ID
+ * * -ENOMEM - Memory not enough for storing VM data
+ */
+int gzvm_arch_create_vm(unsigned long vm_type)
+{
+ struct arm_smccc_res res;
+ int ret;
+
+ ret = gzvm_hypcall_wrapper(MT_HVC_GZVM_CREATE_VM, vm_type, 0, 0, 0, 0,
+ 0, 0, &res);
+ return ret ? ret : res.a1;
+}
+
+int gzvm_arch_destroy_vm(u16 vm_id)
+{
+ struct arm_smccc_res res;
+
+ return gzvm_hypcall_wrapper(MT_HVC_GZVM_DESTROY_VM, vm_id, 0, 0, 0, 0,
+ 0, 0, &res);
+}
diff --git a/drivers/virt/geniezone/Makefile b/drivers/virt/geniezone/Makefile
index 3a82e5fddf90..25614ea3dea2 100644
--- a/drivers/virt/geniezone/Makefile
+++ b/drivers/virt/geniezone/Makefile
@@ -6,4 +6,4 @@
GZVM_DIR ?= ../../../drivers/virt/geniezone
-gzvm-y := $(GZVM_DIR)/gzvm_main.o
+gzvm-y := $(GZVM_DIR)/gzvm_main.o $(GZVM_DIR)/gzvm_vm.o
diff --git a/drivers/virt/geniezone/gzvm_main.c b/drivers/virt/geniezone/gzvm_main.c
index 12efc3db516a..4b4e5a222a6e 100644
--- a/drivers/virt/geniezone/gzvm_main.c
+++ b/drivers/virt/geniezone/gzvm_main.c
@@ -4,6 +4,7 @@
*/
#include <linux/device.h>
+#include <linux/file.h>
#include <linux/kdev_t.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
@@ -40,7 +41,21 @@ int gzvm_err_to_errno(unsigned long err)
return -EINVAL;
}
+static long gzvm_dev_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long user_args)
+{
+ switch (cmd) {
+ case GZVM_CREATE_VM:
+ return gzvm_dev_ioctl_create_vm(user_args);
+ default:
+ break;
+ }
+
+ return -ENOTTY;
+}
+
static const struct file_operations gzvm_chardev_ops = {
+ .unlocked_ioctl = gzvm_dev_ioctl,
.llseek = noop_llseek,
};
@@ -62,6 +77,7 @@ static int gzvm_drv_probe(struct platform_device *pdev)
static int gzvm_drv_remove(struct platform_device *pdev)
{
+ gzvm_destroy_all_vms();
misc_deregister(&gzvm_dev);
return 0;
}
diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
new file mode 100644
index 000000000000..76722dba6b1f
--- /dev/null
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/anon_inodes.h>
+#include <linux/file.h>
+#include <linux/kdev_t.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/soc/mediatek/gzvm_drv.h>
+
+static DEFINE_MUTEX(gzvm_list_lock);
+static LIST_HEAD(gzvm_list);
+
+static void gzvm_destroy_vm(struct gzvm *gzvm)
+{
+ pr_debug("VM-%u is going to be destroyed\n", gzvm->vm_id);
+
+ mutex_lock(&gzvm->lock);
+
+ gzvm_arch_destroy_vm(gzvm->vm_id);
+
+ mutex_lock(&gzvm_list_lock);
+ list_del(&gzvm->vm_list);
+ mutex_unlock(&gzvm_list_lock);
+
+ mutex_unlock(&gzvm->lock);
+
+ kfree(gzvm);
+}
+
+static int gzvm_vm_release(struct inode *inode, struct file *filp)
+{
+ struct gzvm *gzvm = filp->private_data;
+
+ gzvm_destroy_vm(gzvm);
+ return 0;
+}
+
+static const struct file_operations gzvm_vm_fops = {
+ .release = gzvm_vm_release,
+ .llseek = noop_llseek,
+};
+
+static struct gzvm *gzvm_create_vm(unsigned long vm_type)
+{
+ int ret;
+ struct gzvm *gzvm;
+
+ gzvm = kzalloc(sizeof(*gzvm), GFP_KERNEL);
+ if (!gzvm)
+ return ERR_PTR(-ENOMEM);
+
+ ret = gzvm_arch_create_vm(vm_type);
+ if (ret < 0) {
+ kfree(gzvm);
+ return ERR_PTR(ret);
+ }
+
+ gzvm->vm_id = ret;
+ gzvm->mm = current->mm;
+ mutex_init(&gzvm->lock);
+
+ mutex_lock(&gzvm_list_lock);
+ list_add(&gzvm->vm_list, &gzvm_list);
+ mutex_unlock(&gzvm_list_lock);
+
+ pr_debug("VM-%u is created\n", gzvm->vm_id);
+
+ return gzvm;
+}
+
+/**
+ * gzvm_dev_ioctl_create_vm - Create vm fd
+ * @vm_type: VM type. Only supports Linux VM now.
+ *
+ * Return: fd of vm, negative if error
+ */
+int gzvm_dev_ioctl_create_vm(unsigned long vm_type)
+{
+ struct gzvm *gzvm;
+
+ gzvm = gzvm_create_vm(vm_type);
+ if (IS_ERR(gzvm))
+ return PTR_ERR(gzvm);
+
+ return anon_inode_getfd("gzvm-vm", &gzvm_vm_fops, gzvm,
+ O_RDWR | O_CLOEXEC);
+}
+
+void gzvm_destroy_all_vms(void)
+{
+ struct gzvm *gzvm, *tmp;
+
+ mutex_lock(&gzvm_list_lock);
+ if (list_empty(&gzvm_list))
+ goto out;
+
+ list_for_each_entry_safe(gzvm, tmp, &gzvm_list, vm_list)
+ gzvm_destroy_vm(gzvm);
+
+out:
+ mutex_unlock(&gzvm_list_lock);
+}
diff --git a/include/linux/soc/mediatek/gzvm_drv.h b/include/linux/soc/mediatek/gzvm_drv.h
index 907f2f984de9..e7c29c826a7c 100644
--- a/include/linux/soc/mediatek/gzvm_drv.h
+++ b/include/linux/soc/mediatek/gzvm_drv.h
@@ -6,6 +6,12 @@
#ifndef __GZVM_DRV_H__
#define __GZVM_DRV_H__
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/gzvm.h>
+
+#define INVALID_VM_ID 0xffff
+
/*
* These are the definitions of APIs between GenieZone hypervisor and driver,
* there's no need to be visible to uapi. Furthermore, we need GenieZone
@@ -17,9 +23,30 @@
#define ERR_NOT_IMPLEMENTED (-27)
#define ERR_FAULT (-40)
+/**
+ * struct gzvm: the following data structures are for data transferring between
+ * driver and hypervisor, and they're aligned with hypervisor definitions.
+ * @mm: userspace tied to this vm
+ * @lock: lock for list_add
+ * @vm_list: list head for vm list
+ * @vm_id: vm id
+ */
+struct gzvm {
+ struct mm_struct *mm;
+ struct mutex lock;
+ struct list_head vm_list;
+ u16 vm_id;
+};
+
+int gzvm_dev_ioctl_create_vm(unsigned long vm_type);
+
int gzvm_err_to_errno(unsigned long err);
+void gzvm_destroy_all_vms(void);
+
/* arch-dependant functions */
int gzvm_arch_probe(void);
+int gzvm_arch_create_vm(unsigned long vm_type);
+int gzvm_arch_destroy_vm(u16 vm_id);
#endif /* __GZVM_DRV_H__ */
diff --git a/include/uapi/linux/gzvm.h b/include/uapi/linux/gzvm.h
new file mode 100644
index 000000000000..c26c7720fab7
--- /dev/null
+++ b/include/uapi/linux/gzvm.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+/**
+ * DOC: UAPI of GenieZone Hypervisor
+ *
+ * This file declares common data structure shared among user space,
+ * kernel space, and GenieZone hypervisor.
+ */
+#ifndef __GZVM_H__
+#define __GZVM_H__
+
+#include <linux/const.h>
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+/* GZVM ioctls */
+#define GZVM_IOC_MAGIC 0x92 /* gz */
+
+/* ioctls for /dev/gzvm fds */
+#define GZVM_CREATE_VM _IO(GZVM_IOC_MAGIC, 0x01) /* Returns a Geniezone VM fd */
+
+#endif /* __GZVM_H__ */
--
2.18.0