Re: [PATCH v1 3/6] soc: mediatek: virt: geniezone: Introduce GenieZone hypervisor support

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Il 13/04/23 11:07, Yi-De Wu ha scritto:
From: "Yingshiuan Pan" <yingshiuan.pan@xxxxxxxxxxxx>

GenieZone is MediaTek proprietary hypervisor solution, and it is running
in EL2 stand alone as a type-I hypervisor. This patch exports a set of
ioctl interfaces for userspace VMM (e.g., crosvm) to operate guest VMs
lifecycle (creation, running, and destroy) on GenieZone.

Signed-off-by: Yingshiuan Pan <yingshiuan.pan@xxxxxxxxxxxx>
Signed-off-by: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx>
---
  arch/arm64/include/uapi/asm/gzvm_arch.h       |  79 ++++
  drivers/soc/mediatek/Kconfig                  |   2 +
  drivers/soc/mediatek/Makefile                 |   1 +
  drivers/soc/mediatek/virt/geniezone/Kconfig   |  17 +
  drivers/soc/mediatek/virt/geniezone/Makefile  |   5 +
  drivers/soc/mediatek/virt/geniezone/gzvm.h    | 103 ++++
  .../soc/mediatek/virt/geniezone/gzvm_hyp.h    |  72 +++
  .../soc/mediatek/virt/geniezone/gzvm_main.c   | 233 +++++++++
  .../soc/mediatek/virt/geniezone/gzvm_vcpu.c   | 266 +++++++++++
  drivers/soc/mediatek/virt/geniezone/gzvm_vm.c | 444 ++++++++++++++++++
  include/uapi/linux/gzvm_common.h              | 217 +++++++++
  11 files changed, 1439 insertions(+)
  create mode 100644 arch/arm64/include/uapi/asm/gzvm_arch.h
  create mode 100644 drivers/soc/mediatek/virt/geniezone/Kconfig
  create mode 100644 drivers/soc/mediatek/virt/geniezone/Makefile
  create mode 100644 drivers/soc/mediatek/virt/geniezone/gzvm.h
  create mode 100644 drivers/soc/mediatek/virt/geniezone/gzvm_hyp.h
  create mode 100644 drivers/soc/mediatek/virt/geniezone/gzvm_main.c
  create mode 100644 drivers/soc/mediatek/virt/geniezone/gzvm_vcpu.c
  create mode 100644 drivers/soc/mediatek/virt/geniezone/gzvm_vm.c
  create mode 100644 include/uapi/linux/gzvm_common.h

diff --git a/arch/arm64/include/uapi/asm/gzvm_arch.h b/arch/arm64/include/uapi/asm/gzvm_arch.h
new file mode 100644
index 000000000000..3714f96c832b
--- /dev/null
+++ b/arch/arm64/include/uapi/asm/gzvm_arch.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#ifndef __GZVM_ARCH_H__
+#define __GZVM_ARCH_H__
+
+#include <asm/ptrace.h>
+
+/*
+ * Architecture specific registers are to be defined in arch headers and
+ * ORed with the arch identifier.
+ */
+#define GZVM_REG_ARM		0x4000000000000000ULL
+#define GZVM_REG_ARM64		0x6000000000000000ULL
+
+#define GZVM_REG_SIZE_SHIFT	52
+#define GZVM_REG_SIZE_MASK	0x00f0000000000000ULL
+#define GZVM_REG_SIZE_U8	0x0000000000000000ULL
+#define GZVM_REG_SIZE_U16	0x0010000000000000ULL
+#define GZVM_REG_SIZE_U32	0x0020000000000000ULL
+#define GZVM_REG_SIZE_U64	0x0030000000000000ULL
+#define GZVM_REG_SIZE_U128	0x0040000000000000ULL
+#define GZVM_REG_SIZE_U256	0x0050000000000000ULL
+#define GZVM_REG_SIZE_U512	0x0060000000000000ULL
+#define GZVM_REG_SIZE_U1024	0x0070000000000000ULL
+#define GZVM_REG_SIZE_U2048	0x0080000000000000ULL
+
+#define GZVM_NR_SPSR	5
+struct gzvm_regs {
+	struct user_pt_regs regs;	/* sp = sp_el0 */
+
+	__u64	sp_el1;
+	__u64	elr_el1;
+
+	__u64	spsr[GZVM_NR_SPSR];
+
+	struct user_fpsimd_state fp_regs;
+};
+
+/* If you need to interpret the index values, here is the key: */
+#define GZVM_REG_ARM_COPROC_MASK	0x000000000FFF0000
+#define GZVM_REG_ARM_COPROC_SHIFT	16
+
+/* Normal registers are mapped as coprocessor 16. */
+#define GZVM_REG_ARM_CORE		(0x0010 << GZVM_REG_ARM_COPROC_SHIFT)
+#define GZVM_REG_ARM_CORE_REG(name)	(offsetof(struct gzvm_regs, name) / sizeof(__u32))
+
+/* Some registers need more space to represent values. */
+#define GZVM_REG_ARM_DEMUX		(0x0011 << GZVM_REG_ARM_COPROC_SHIFT)
+#define GZVM_REG_ARM_DEMUX_ID_MASK	0x000000000000FF00
+#define GZVM_REG_ARM_DEMUX_ID_SHIFT	8
+#define GZVM_REG_ARM_DEMUX_ID_CCSIDR	(0x00 << GZVM_REG_ARM_DEMUX_ID_SHIFT)
+#define GZVM_REG_ARM_DEMUX_VAL_MASK	0x00000000000000FF
+#define GZVM_REG_ARM_DEMUX_VAL_SHIFT	0
+
+/* AArch64 system registers */
+#define GZVM_REG_ARM64_SYSREG		(0x0013 << GZVM_REG_ARM_COPROC_SHIFT)
+#define GZVM_REG_ARM64_SYSREG_OP0_MASK	0x000000000000c000
+#define GZVM_REG_ARM64_SYSREG_OP0_SHIFT	14
+#define GZVM_REG_ARM64_SYSREG_OP1_MASK	0x0000000000003800
+#define GZVM_REG_ARM64_SYSREG_OP1_SHIFT	11
+#define GZVM_REG_ARM64_SYSREG_CRN_MASK	0x0000000000000780
+#define GZVM_REG_ARM64_SYSREG_CRN_SHIFT	7
+#define GZVM_REG_ARM64_SYSREG_CRM_MASK	0x0000000000000078
+#define GZVM_REG_ARM64_SYSREG_CRM_SHIFT	3
+#define GZVM_REG_ARM64_SYSREG_OP2_MASK	0x0000000000000007
+#define GZVM_REG_ARM64_SYSREG_OP2_SHIFT	0
+
+/* Physical Timer EL0 Registers */
+#define GZVM_REG_ARM_PTIMER_CTL		ARM64_SYS_REG(3, 3, 14, 2, 1)
+#define GZVM_REG_ARM_PTIMER_CVAL	ARM64_SYS_REG(3, 3, 14, 2, 2)
+#define GZVM_REG_ARM_PTIMER_CNT		ARM64_SYS_REG(3, 3, 14, 0, 1)
+
+/* SVE registers */
+#define GZVM_REG_ARM64_SVE		(0x0015 << KVM_REG_ARM_COPROC_SHIFT)
+
+#endif /* __GZVM_ARCH_H__ */
diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
index a88cf04fc803..01fad024a1c1 100644
--- a/drivers/soc/mediatek/Kconfig
+++ b/drivers/soc/mediatek/Kconfig
@@ -91,4 +91,6 @@ config MTK_SVS
  	  chip process corner, temperatures and other factors. Then DVFS
  	  driver could apply SVS bank voltage to PMIC/Buck.
+source "drivers/soc/mediatek/virt/geniezone/Kconfig"
+
  endmenu
diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index 8c0ddacbcde8..e5d7225c1d08 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_MTK_SCPSYS_PM_DOMAINS) += mtk-pm-domains.o
  obj-$(CONFIG_MTK_MMSYS) += mtk-mmsys.o
  obj-$(CONFIG_MTK_MMSYS) += mtk-mutex.o
  obj-$(CONFIG_MTK_SVS) += mtk-svs.o
+obj-$(CONFIG_MTK_GZVM) += virt/geniezone/
diff --git a/drivers/soc/mediatek/virt/geniezone/Kconfig b/drivers/soc/mediatek/virt/geniezone/Kconfig
new file mode 100644
index 000000000000..6fad3c30f8d9
--- /dev/null
+++ b/drivers/soc/mediatek/virt/geniezone/Kconfig
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config MTK_GZVM
+	tristate "GenieZone Hypervisor driver for guest VM operation"
+	depends on ARM64
+	depends on KVM
+	help
+	  This driver, gzvm, enables to run guest VMs on MTK GenieZone
+	  hypervisor. It exports kvm-like interfaces for VMM (e.g., crosvm) in
+	  order to operate guest VMs on GenieZone hypervisor.
+
+	  GenieZone hypervisor now only supports MediaTek SoC and arm64
+	  architecture.
+
+	  Select M if you want it be built as a module (gzvm.ko).
+
+	  If unsure, say N.
diff --git a/drivers/soc/mediatek/virt/geniezone/Makefile b/drivers/soc/mediatek/virt/geniezone/Makefile
new file mode 100644
index 000000000000..e1dfbb9c568d
--- /dev/null
+++ b/drivers/soc/mediatek/virt/geniezone/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+gzvm-y := gzvm_main.o gzvm_vm.o gzvm_vcpu.o
+
+obj-$(CONFIG_MTK_GZVM) += gzvm.o
diff --git a/drivers/soc/mediatek/virt/geniezone/gzvm.h b/drivers/soc/mediatek/virt/geniezone/gzvm.h
new file mode 100644
index 000000000000..43f215d4b0da
--- /dev/null
+++ b/drivers/soc/mediatek/virt/geniezone/gzvm.h
@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#ifndef __GZVM_H__
+#define __GZVM_H__
+
+#include <linux/srcu.h>
+#include <linux/arm-smccc.h>
+#include <linux/gzvm_common.h>
+#include "gzvm_hyp.h"
+
+#define MODULE_NAME	"gzvm"
+#define GZVM_VCPU_MMAP_SIZE  PAGE_SIZE
+#define INVALID_VM_ID   0xffff
+
+/* VM's memory slot descriptor */

You've documented almost all of the members of this struct ... can you please
change that to kerneldoc?

/**
 * struct gzvm_memslot - VM memory slot descriptor
 * @base_qfn:       Base of guest page frame
 * @npages:         Number of pages this slot covers
 * @userspace_addr: Corresponding user-space VA
 * .....other members
 */

+struct gzvm_memslot {
+	u64 base_gfn;			/* begin of guest page frame */
+	unsigned long npages;		/* number of pages this slot covers */
+	unsigned long userspace_addr;	/* corresponding userspace va */
+	struct vm_area_struct *vma;	/* vma related to this userspace addr */
+	u32 flags;
+	u32 slot_id;
+};
+
+/* pre-declaration for circular reference in struct gzvm */
+struct gzvm_vcpu;
+

Same here, if you could add kerneldoc description to this struct, that would
be highly appreciated, as it would greatly increase human readability.

+struct gzvm {
+	struct gzvm_vcpu *vcpus[GZVM_MAX_VCPUS];
+	struct mm_struct *mm; /* userspace tied to this vm */
+	struct gzvm_memslot memslot[GZVM_MAX_MEM_REGION];
+	struct mutex lock;
+	struct list_head vm_list;
+	struct list_head devices;
+	gzvm_id_t vm_id;
+
+	struct {
+		spinlock_t        lock;
+		struct list_head  items;
+		struct list_head  resampler_list;
+		struct mutex      resampler_lock;
+	} irqfds;
+	struct hlist_head irq_ack_notifier_list;
+	struct srcu_struct irq_srcu;
+	struct mutex irq_lock;
+};
+
+struct gzvm_vcpu {
+	struct gzvm *gzvm;
+	int vcpuid;
+	struct mutex lock;
+	struct gzvm_vcpu_run *run;
+	struct gzvm_vcpu_hwstate *hwstate;
+};
+
+/**
+ * allocate 2 pages for data sharing between driver and gz hypervisor
+ * |- page 0           -|- page 1      -|
+ * |gzvm_vcpu_run|......|hwstate|.......|
+ */
+#define GZVM_VCPU_RUN_MAP_SIZE		(PAGE_SIZE * 2)
+
+long gzvm_dev_ioctl_check_extension(struct gzvm *gzvm, unsigned long args);
+
+void gzvm_destroy_vcpu(struct gzvm_vcpu *vcpu);
+int gzvm_vm_ioctl_create_vcpu(struct gzvm *gzvm, u32 cpuid);
+int gzvm_dev_ioctl_create_vm(unsigned long vm_type);
+
+int gzvm_arm_get_reg(struct gzvm_vcpu *vcpu, const struct gzvm_one_reg *reg);
+int gzvm_arm_set_reg(struct gzvm_vcpu *vcpu, const struct gzvm_one_reg *reg);
+
+int gzvm_hypcall_wrapper(unsigned long a0, unsigned long a1, unsigned long a2,
+			 unsigned long a3, unsigned long a4, unsigned long a5,
+			 unsigned long a6, unsigned long a7,
+			 struct arm_smccc_res *res);

Could you please keep function signatures after *all* definitions?

+
+#define SMC_ENTITY_MTK			59
+#define GZVM_FUNCID_START		(0x1000)
+#define GZVM_HCALL_ID(func)				\
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32,	\
+			   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_CREATE_VCPU		GZVM_HCALL_ID(GZVM_FUNC_CREATE_VCPU)
+#define MT_HVC_GZVM_DESTROY_VCPU	GZVM_HCALL_ID(GZVM_FUNC_DESTROY_VCPU)
+#define MT_HVC_GZVM_SET_MEMREGION	GZVM_HCALL_ID(GZVM_FUNC_SET_MEMREGION)
+#define MT_HVC_GZVM_RUN			GZVM_HCALL_ID(GZVM_FUNC_RUN)
+#define MT_HVC_GZVM_GET_REGS		GZVM_HCALL_ID(GZVM_FUNC_GET_REGS)
+#define MT_HVC_GZVM_SET_REGS		GZVM_HCALL_ID(GZVM_FUNC_SET_REGS)
+#define MT_HVC_GZVM_GET_ONE_REG		GZVM_HCALL_ID(GZVM_FUNC_GET_ONE_REG)
+#define MT_HVC_GZVM_SET_ONE_REG		GZVM_HCALL_ID(GZVM_FUNC_SET_ONE_REG)
+#define MT_HVC_GZVM_IRQ_LINE		GZVM_HCALL_ID(GZVM_FUNC_IRQ_LINE)
+#define MT_HVC_GZVM_CREATE_DEVICE	GZVM_HCALL_ID(GZVM_FUNC_CREATE_DEVICE)
+#define MT_HVC_GZVM_PROBE		GZVM_HCALL_ID(GZVM_FUNC_PROBE)
+#define MT_HVC_GZVM_ENABLE_CAP		GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP)
+

(move them all here)

+int gz_err_to_errno(unsigned long err);
+
+#endif /* __GZVM_H__ */

..snip..

diff --git a/drivers/soc/mediatek/virt/geniezone/gzvm_main.c b/drivers/soc/mediatek/virt/geniezone/gzvm_main.c
new file mode 100644
index 000000000000..1fabe4a579da
--- /dev/null
+++ b/drivers/soc/mediatek/virt/geniezone/gzvm_main.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/anon_inodes.h>
+#include <linux/arm-smccc.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/kdev_t.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include "gzvm.h"
+
+static void (*invoke_gzvm_fn)(unsigned long, unsigned long, unsigned long,
+			      unsigned long, unsigned long, unsigned long,
+			      unsigned long, unsigned long,
+			      struct arm_smccc_res *);
+
+static void gzvm_hvc(unsigned long a0, unsigned long a1, unsigned long a2,
+		      unsigned long a3, unsigned long a4, unsigned long a5,
+		      unsigned long a6, unsigned long a7,
+		      struct arm_smccc_res *res)
+{
+	arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
+}
+
+static void gzvm_smc(unsigned long a0, unsigned long a1, unsigned long a2,
+		      unsigned long a3, unsigned long a4, unsigned long a5,
+		      unsigned long a6, unsigned long a7,
+		      struct arm_smccc_res *res)
+{
+	arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
+}

Why are you wrapping HVC and SMC functions? You're not doing anything special,
so you can simply call arm_amccc_{hvc,smc}() instead of specifying new wrappers.

Or are you worried about that changing signature all of a sudden?
This is not downstream, you don't have to worry about that. :-)

+
+static int gzvm_probe_conduit(void)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_hvc(MT_HVC_GZVM_PROBE, 0, 0, 0, 0, 0, 0, 0, &res);
+	if (res.a0 == 0) {
+		invoke_gzvm_fn = gzvm_hvc;

invoke_gzvm_fn = arm_smccc_hvc;

+		return 0;
+	}
+
+	arm_smccc_smc(MT_HVC_GZVM_PROBE, 0, 0, 0, 0, 0, 0, 0, &res);
+	if (res.a0 == 0) {
+		invoke_gzvm_fn = gzvm_smc;

invoke_gzvm_fn = arm_smccc_smc;

+		return 0;
+	}
+
+	return -ENXIO;
+}
+
+/**
+ * @brief geniezone hypercall wrapper
+ * @return int geniezone's return value will be converted to Linux errno
+ */

Kerneldoc please:

/**
 * gzvm_hypcall_wrapper() - GenieZone HyperCall wrapper
 * @a0: ...
 * @a1: ....
 * ......
 * Return: Zero for success, or a negative error number.
 *
 * The GenieZone return values are different from Linux error codes, hence
 * in case of error value, it is converted to a Linux negative error number.
 */

+int gzvm_hypcall_wrapper(unsigned long a0, unsigned long a1, unsigned long a2,
+			 unsigned long a3, unsigned long a4, unsigned long a5,
+			 unsigned long a6, unsigned long a7,
+			 struct arm_smccc_res *res)
+{
+	invoke_gzvm_fn(a0, a1, a2, a3, a4, a5, a6, a7, res);
+	return gz_err_to_errno(res->a0);
+}
+
+/**
+ * @brief Convert geniezone return value to standard errno
+ *
+ * @param err return value from geniezone hypercall (a0)
+ * @return int errno
+ */
+int gz_err_to_errno(unsigned long err)
+{
+	int gz_err = (int) err;
+
+	switch (gz_err) {
+	case 0:
+		return 0;
+	case ERR_NO_MEMORY:
+		return -ENOMEM;
+	case ERR_NOT_SUPPORTED:
+		return -EOPNOTSUPP;
+	case ERR_NOT_IMPLEMENTED:
+		return -EOPNOTSUPP;
+	case ERR_FAULT:
+		return -EFAULT;
+	default:

	default:
		break;
	}

	return -EINVAL;
};



+
+static int gzvm_cap_arm_vm_ipa_size(void __user *argp)
+{
+	u64 value = CONFIG_ARM64_PA_BITS;
+
+	if (copy_to_user(argp, &value, sizeof(u64)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/**
+ * @brief Check if given capability is support or not
+ *
+ * @param args in/out u64 pointer from userspace
+ * @retval 0: support, no error
+ * @retval -EOPNOTSUPP: not support
+ * @retval -EFAULT: failed to get data from userspace
+ */

kerneldoc again, please.

+long gzvm_dev_ioctl_check_extension(struct gzvm *gzvm, unsigned long args)
+{
+	int ret = -EOPNOTSUPP;
+	__u64 cap, success = 1;
+	void __user *argp = (void __user *) args;
+
+	if (copy_from_user(&cap, argp, sizeof(uint64_t)))
+		return -EFAULT;
+
+	switch (cap) {
+	case GZVM_CAP_ARM_PROTECTED_VM:
+		if (copy_to_user(argp, &success, sizeof(uint64_t)))
+			return -EFAULT;
+		ret = 0;
+		break;
+	case GZVM_CAP_ARM_VM_IPA_SIZE:
+		ret = gzvm_cap_arm_vm_ipa_size(argp);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+	}
+
+	return ret;
+}
+ > +static long gzvm_dev_ioctl(struct file *filp, unsigned int cmd,
+			    unsigned long user_args)
+{
+	long ret = -ENOTTY;
+
+	switch (cmd) {
+	case GZVM_CREATE_VM:
+		ret = gzvm_dev_ioctl_create_vm(user_args);
+		break;
+	case GZVM_CHECK_EXTENSION:
+		if (!user_args)
+			return -EINVAL;
+		ret = gzvm_dev_ioctl_check_extension(NULL, user_args);
+		break;
+	default:
+		ret = -ENOTTY;
+	}
+
+	return ret;
+}
+
+static const struct file_operations gzvm_chardev_ops = {
+	.unlocked_ioctl = gzvm_dev_ioctl,
+	.llseek		= noop_llseek,
+};
+
+static struct miscdevice gzvm_dev = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = MODULE_NAME,
+	.fops = &gzvm_chardev_ops,
+};
+
+static int gzvm_drv_probe(struct platform_device *pdev)
+{
+	if (!of_device_is_available(dev_of_node(&pdev->dev))) {

Uhm, is there something I don't get here?
This call looks odd; you're probing GZVM in this function....

+		dev_info(&pdev->dev, "GenieZone hypervisor is not available\n");
+		return -ENODEV;
+	}
+
+	if (gzvm_probe_conduit() != 0) {
+		dev_err(&pdev->dev, "Not found available conduit\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int gzvm_drv_remove(struct platform_device *pdev)
+{
+	misc_deregister(&gzvm_dev);
+
+	return 0;
+}
+
+static const struct of_device_id gzvm_of_match[] = {
+	{ .compatible = "mediatek,gzvm", },

	{ .compatible = "mediatek,geniezone-hyp" },
or
	{ .compatible = "mediatek,geniezone" },

..makes it a bit more descriptive and human readable.

+	{},

^^^ always end with { /* sentinel */ },

+};
+MODULE_DEVICE_TABLE(of, gzvm_of_match);
+
+static struct platform_driver gzvm_driver = {
+	.probe = gzvm_drv_probe,
+	.remove = gzvm_drv_remove,
+	.driver = {
+			.name = MODULE_NAME,
+			.owner = THIS_MODULE,
+			.of_match_table = gzvm_of_match,

Fix indentation please.

+	},
+};
+
+static int __init gzvm_init(void)

You don't need this at all, as all you're doing here is registering your platform
driver; and that's even a module_init(), so you can simply do

module_platform_driver(gzvm_driver);

...without open coding init/exit functions.

+{
+	int ret = 0;
+
+	ret = platform_driver_register(&gzvm_driver);
+	if (ret)
+		pr_err("Failed to register gzvm driver.\n");
+
+	return ret;
+}
+
+static void __exit gzvm_exit(void)
+{
+	platform_driver_unregister(&gzvm_driver);
+}
+
+module_init(gzvm_init);
+module_exit(gzvm_exit);
+
+MODULE_AUTHOR("MediaTek");
+MODULE_DESCRIPTION("GenieZone interface for VMM");
+MODULE_LICENSE("GPL");
diff --git a/drivers/soc/mediatek/virt/geniezone/gzvm_vcpu.c b/drivers/soc/mediatek/virt/geniezone/gzvm_vcpu.c
new file mode 100644
index 000000000000..726db866dfcf
--- /dev/null
+++ b/drivers/soc/mediatek/virt/geniezone/gzvm_vcpu.c
@@ -0,0 +1,266 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <asm/sysreg.h>
+#include <linux/anon_inodes.h>
+#include <linux/file.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include "gzvm.h"
+
+static int gzvm_vcpu_update_one_reg_hyp(struct gzvm_vcpu *vcpu, __u64 reg_id,
+					bool is_write, __u64 *data)
+{
+	struct arm_smccc_res res;
+	unsigned long a1;
+	int ret;
+
+	a1 = assemble_vm_vcpu_tuple(vcpu->gzvm->vm_id, vcpu->vcpuid);
+	if (!is_write) {
+		ret = gzvm_hypcall_wrapper(MT_HVC_GZVM_GET_ONE_REG,
+					   a1, reg_id, 0, 0, 0, 0, 0, &res);
+		if (ret == 0)
+			*data = res.a1;
+	} else {
+		ret = gzvm_hypcall_wrapper(MT_HVC_GZVM_SET_ONE_REG,
+					   a1, reg_id, *data, 0, 0, 0, 0, &res);
+	}
+
+	return ret;
+}
+
+static long gzvm_vcpu_update_one_reg(struct gzvm_vcpu *vcpu, void * __user argp,
+				     bool is_write)
+{
+	long ret;
+	__u64 reg_size, data = 0;
+	struct gzvm_one_reg reg;
+	void __user *reg_addr;

Please reorder those variables.

	struct gzvm_one_reg reg;
	void __user *reg_addr;
	u64 data = 0;
	u64 reg_sz;
	long ret;

+
+	if (copy_from_user(&reg, argp, sizeof(reg)))
+		return -EFAULT;
+	reg_addr = (void __user *)reg.addr;
+
+	/* reg id follows KVM's encoding */
+	switch (reg.id & GZVM_REG_ARM_COPROC_MASK) {
+	case GZVM_REG_ARM_CORE:
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+

Make it more readable please...

	reg_size = (reg.id & GZVM_REG_SIZE_MASK) >> GZVM_REG_SIZE_SHIFT;
	reg_size = BIT(reg_size);

...or, even better, you can use bitfield macros, such as FIELD_PREP(), which
would simplify that even more.

+	reg_size = 1 << ((reg.id & GZVM_REG_SIZE_MASK) >> GZVM_REG_SIZE_SHIFT);
+	if (is_write) {
+		if (copy_from_user(&data, reg_addr, reg_size))
+			return -EFAULT;
+	}
+
+	ret = gzvm_vcpu_update_one_reg_hyp(vcpu, reg.id, is_write, &data);
+

	if (ret)
		return ret;

	if (!is_write) {
		if (copy_to_user.....)
			return -EFAULT;
	}

	return 0;

+	if (!is_write && ret == 0) {
+		if (copy_to_user(reg_addr, &data, reg_size))
+			return -EFAULT;
+	}
+
+	return ret;
+}
+
+/**
+ * @brief Handle vcpu run ioctl, entry point to guest and exit point from guest
+ *
+ * @param filp
+ * @param argp pointer to struct gzvm_vcpu_run in userspace
+ * @return long
+ */
+static long gzvm_vcpu_run(struct gzvm_vcpu *vcpu, void * __user argp)
+{
+	unsigned long id_tuple;
+	struct arm_smccc_res res;
+	bool need_userspace = false;
+
+	if (copy_from_user(vcpu->run, argp, sizeof(struct gzvm_vcpu_run)))
+		return -EFAULT;
+
+	if (vcpu->run->immediate_exit == 1)
+		return -EINTR;
+
+	id_tuple = assemble_vm_vcpu_tuple(vcpu->gzvm->vm_id, vcpu->vcpuid);
+	do {
+		gzvm_hypcall_wrapper(MT_HVC_GZVM_RUN, id_tuple, 0, 0, 0, 0, 0,
+				     0, &res);
+		switch (res.a1) {
+		case GZVM_EXIT_MMIO:
+			need_userspace = true;
+			break;
+		/*
+		 * geniezone's responsibility to fill corresponding data
+		 * structure
+		 */
+		case GZVM_EXIT_HVC:

			/* fallthrough */

+		case GZVM_EXIT_EXCEPTION:

			/* fallthrough */

+		case GZVM_EXIT_DEBUG:

			/* fallthrough */

+		case GZVM_EXIT_FAIL_ENTRY:

			/* fallthrough */

+		case GZVM_EXIT_INTERNAL_ERROR:

			/* fallthrough */

+		case GZVM_EXIT_SYSTEM_EVENT:

			/* fallthrough */

+		case GZVM_EXIT_SHUTDOWN:
+			need_userspace = true;
+			break;
+		case GZVM_EXIT_IRQ:
+			break;
+		case GZVM_EXIT_UNKNOWN:

			/* fallthrough */

+		default:
+			pr_err("vcpu unknown exit\n");

Also, please use dev_err() when possible.

+			need_userspace = true;
+			goto out;
+		}
+	} while (!need_userspace);
+
+out:
+	if (copy_to_user(argp, vcpu->run, sizeof(struct gzvm_vcpu_run)))
+		return -EFAULT;
+	return 0;
+}
+
+static long gzvm_vcpu_ioctl(struct file *filp, unsigned int ioctl,
+			    unsigned long arg)
+{
+	int ret = -ENOTTY;
+	void __user *argp = (void __user *)arg;
+	struct gzvm_vcpu *vcpu = filp->private_data;
+
+	switch (ioctl) {
+	case GZVM_RUN:
+		ret = gzvm_vcpu_run(vcpu, argp);
+		break;
+	case GZVM_GET_ONE_REG:
+		ret = gzvm_vcpu_update_one_reg(vcpu, argp, false /*is_write*/);
+		break;
+	case GZVM_SET_ONE_REG:
+		ret = gzvm_vcpu_update_one_reg(vcpu, argp, true  /*is_write*/);
+		break;
+	default:
+		ret = -ENOTTY;

instead of initializing `ret`, you can just....

		return -ENOTTY;

+		break;
+	}
+
+	return ret;
+}
+
+static const struct file_operations gzvm_vcpu_fops = {
+	.unlocked_ioctl = gzvm_vcpu_ioctl,
+	.llseek		= noop_llseek,
+};
+
+static int gzvm_destroy_vcpu_hyp(gzvm_id_t vm_id, int vcpuid)
+{
+	struct arm_smccc_res res;
+	unsigned long a1;
+
+	a1 = assemble_vm_vcpu_tuple(vm_id, vcpuid);
+	gzvm_hypcall_wrapper(MT_HVC_GZVM_DESTROY_VCPU, a1, 0, 0, 0, 0, 0, 0,
+			     &res);
+
+	return 0;
+}
+
+/**
+ * @brief call smc to gz hypervisor to create vcpu
+ *
+ * @param run virtual address of vcpu->run
+ * @return int
+ */

kerneldoc please

+static int gzvm_create_vcpu_hyp(gzvm_id_t vm_id, int vcpuid, void *run)
+{
+	struct arm_smccc_res res;
+	unsigned long a1, a2;
+	int ret;
+
+	a1 = assemble_vm_vcpu_tuple(vm_id, vcpuid);
+	a2 = (__u64)virt_to_phys(run);
+	ret = gzvm_hypcall_wrapper(MT_HVC_GZVM_CREATE_VCPU, a1, a2, 0, 0, 0, 0,
+				   0, &res);
+
+	return ret;
+}
+
+/* Caller must hold the vm lock */
+void gzvm_destroy_vcpu(struct gzvm_vcpu *vcpu)
+{
+	if (!vcpu)
+		return;
+
+	gzvm_destroy_vcpu_hyp(vcpu->gzvm->vm_id, vcpu->vcpuid);
+	/* clean guest's data */
+	memset(vcpu->run, 0, GZVM_VCPU_RUN_MAP_SIZE);
+	free_pages_exact(vcpu->run, GZVM_VCPU_RUN_MAP_SIZE);
+	kfree(vcpu);
+}
+
+#define ITOA_MAX_LEN 12 /* Maximum size needed for holding an integer. */

Move definitions at the beginning of the file, please.

+/**
+ * @brief Allocates an inode for the vcpu.
+ */

Kerneldoc!

+static int create_vcpu_fd(struct gzvm_vcpu *vcpu)
+{
+	/* sizeof("gzvm-vcpu:") + max(strlen(itoa(vcpuid))) + null */
+	char name[10 + ITOA_MAX_LEN + 1];
+
+	snprintf(name, sizeof(name), "gzvm-vcpu:%d", vcpu->vcpuid);
+	return anon_inode_getfd(name, &gzvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
+}
+
+/**
+ * @brief GZVM_CREATE_VCPU
+ *
+ * @param cpuid = arg
+ * @return fd of vcpu, negative errno if error occurs
+ */

kerneldoc!!!! :-)

+int gzvm_vm_ioctl_create_vcpu(struct gzvm *gzvm, u32 cpuid)
+{
+	struct gzvm_vcpu *vcpu;
+	int ret;
+
+	if (cpuid >= GZVM_MAX_VCPUS)
+		return -EINVAL;
+
+	vcpu = kzalloc(sizeof(*vcpu), GFP_KERNEL);
+	if (!vcpu)
+		return -ENOMEM;
+
+	BUILD_BUG_ON((sizeof(*vcpu->run)) > PAGE_SIZE);
+	BUILD_BUG_ON(sizeof(struct gzvm_vcpu_hwstate) > PAGE_SIZE);

Do you really need to crash the kernel?!

You must have a very, very good reason to do that, please justify that carefully
and also write that as a comment in this function.

+	/**
+	 * allocate 2 pages for data sharing between driver and gz hypervisor
+	 * |- page 0           -|- page 1      -|
+	 * |gzvm_vcpu_run|......|hwstate|.......|
+	 */
+	vcpu->run = alloc_pages_exact(GZVM_VCPU_RUN_MAP_SIZE,
+				      GFP_KERNEL_ACCOUNT | __GFP_ZERO);
+	if (!vcpu->run) {
+		ret = -ENOMEM;
+		goto free_vcpu;
+	}
+	vcpu->hwstate = (void *)vcpu->run + PAGE_SIZE;
+	vcpu->vcpuid = cpuid;
+	vcpu->gzvm = gzvm;
+	mutex_init(&vcpu->lock);
+
+	ret = gzvm_create_vcpu_hyp(gzvm->vm_id, vcpu->vcpuid, vcpu->run);
+	if (ret < 0)
+		goto free_vcpu_run;
+
+	ret = create_vcpu_fd(vcpu);
+	if (ret < 0)
+		goto free_vcpu_run;
+	gzvm->vcpus[cpuid] = vcpu;
+
+	return ret;
+
+free_vcpu_run:
+	free_pages_exact(vcpu->run, GZVM_VCPU_RUN_MAP_SIZE);
+free_vcpu:
+	kfree(vcpu);
+	return ret;
+}
diff --git a/drivers/soc/mediatek/virt/geniezone/gzvm_vm.c b/drivers/soc/mediatek/virt/geniezone/gzvm_vm.c
new file mode 100644
index 000000000000..df4ccdc3b7f0
--- /dev/null
+++ b/drivers/soc/mediatek/virt/geniezone/gzvm_vm.c
@@ -0,0 +1,444 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/anon_inodes.h>
+#include <linux/arm-smccc.h>
+#include <linux/file.h>
+#include <linux/kdev_t.h>
+#include <linux/kvm_host.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include "gzvm.h"
+
+static DEFINE_MUTEX(gzvm_list_lock);
+static LIST_HEAD(gzvm_list);
+
+
+/**
+ * @brief Translate gfn (guest ipa) to pfn (host pa), result is in @pfn
+ *
+ * Leverage KVM's `gfn_to_pfn_memslot`. Because `gfn_to_pfn_memslot` needs
+ * kvm_memory_slot as parameter, this function populates necessary fileds
+ * for calling `gfn_to_pfn_memslot`.
+ *
+ * @retval 0 succeed
+ * @retval -EFAULT failed to convert
+ */

kerneldoc please

+int gzvm_gfn_to_pfn_memslot(struct gzvm_memslot *memslot, u64 gfn, u64 *pfn)
+{
+	hfn_t __pfn;
+	struct kvm_memory_slot kvm_slot = {0};
+
+	kvm_slot.base_gfn = memslot->base_gfn;
+	kvm_slot.npages = memslot->npages;
+	kvm_slot.dirty_bitmap = NULL;
+	kvm_slot.userspace_addr = memslot->userspace_addr;
+	kvm_slot.flags = memslot->flags;
+	kvm_slot.id = memslot->slot_id;
+	kvm_slot.as_id = 0;
+
+	__pfn = gfn_to_pfn_memslot(&kvm_slot, gfn);
+	if (is_error_noslot_pfn(__pfn)) {
+		*pfn = 0;
+		return -EFAULT;
+	}
+
+	*pfn = __pfn;
+	return 0;
+}
+
+/**
+ * @brief Populate pa to buffer until full
+ *
+ * @return int how much pages we've fill in, negative if error
+ */

kerneldoc

+static int fill_constituents(struct mem_region_addr_range *consti,
+			     int *consti_cnt, int max_nr_consti, gfn_t gfn,
+			     u32 total_pages, struct gzvm_memslot *slot)
+{
+	int i, nr_pages;
+	hfn_t pfn, prev_pfn;
+	gfn_t gfn_end;

	hfn_t pfn, prev_pfn;
	gfn_t gfn_end;
	int nr_pages = 1;
	int i = 0;

+
+	if (unlikely(total_pages == 0))
+		return -EINVAL;
+	gfn_end = gfn + total_pages;
+
+	/* entry 0 */
+	if (gzvm_gfn_to_pfn_memslot(slot, gfn, &pfn) != 0)
+		return -EFAULT;
+	consti[0].address = PFN_PHYS(pfn);
+	consti[0].pg_cnt = 1;
+	gfn++;
+	prev_pfn = pfn;


+	i = 0;
+	nr_pages = 1;
stack initialized, remove...

+	while (i < max_nr_consti && gfn < gfn_end) {
+		if (gzvm_gfn_to_pfn_memslot(slot, gfn, &pfn) != 0)
+			return -EFAULT;
+		if (pfn == (prev_pfn + 1)) {
+			consti[i].pg_cnt++;
+		} else {
+			i++;
+			if (i >= max_nr_consti)
+				break;
+			consti[i].address = PFN_PHYS(pfn);
+			consti[i].pg_cnt = 1;
+		}
+		prev_pfn = pfn;
+		gfn++;
+		nr_pages++;
+	}

	if (i == max_nr_consti)
		i++;

	*consti_cnt = i;

+	if (i == max_nr_consti)
+		*consti_cnt = i;
+	else
+		*consti_cnt = (i + 1);
+
+	return nr_pages;
+}
+
+/**
+ * @brief Register memory region to GZ
+ *
+ * @param gzvm
+ * @param memslot
+ * @return int
+ */

kerneldoc

+static int
+register_memslot_addr_range(struct gzvm *gzvm, struct gzvm_memslot *memslot)
+{
+	struct gzvm_memory_region_ranges *region;
+	u32 buf_size;
+	int max_nr_consti, remain_pages;
+	gfn_t gfn, gfn_end;

	struct gzvm_memory_region_ranges *region;
	gfn_t gfn, gfn_end;
	int max_nr_consti, remain_pages;
	u32 buf_size;

+
+	buf_size = PAGE_SIZE * 2;
+	region = alloc_pages_exact(buf_size, GFP_KERNEL);
+	if (!region)
+		return -ENOMEM;
+	max_nr_consti = (buf_size - sizeof(*region)) /
+			sizeof(struct mem_region_addr_range);
+
+	region->slot = memslot->slot_id;
+	remain_pages = memslot->npages;
+	gfn = memslot->base_gfn;
+	gfn_end = gfn + remain_pages;
+	while (gfn < gfn_end) {
+		struct arm_smccc_res res;
+		int nr_pages;
+
+		nr_pages = fill_constituents(region->constituents,
+					     &region->constituent_cnt,
+					     max_nr_consti, gfn,
+					     remain_pages, memslot);
+		region->gpa = PFN_PHYS(gfn);
+		region->total_pages = nr_pages;
+
+		remain_pages -= nr_pages;
+		gfn += nr_pages;
+
+		gzvm_hypcall_wrapper(MT_HVC_GZVM_SET_MEMREGION, gzvm->vm_id,
+			     buf_size, virt_to_phys(region), 0, 0, 0, 0, &res);
+
+		if (res.a0 != 0) {
+			pr_err("Failed to register memregion to hypervisor\n");

dev_err() please

+			free_pages_exact(region, buf_size);
+			return -EFAULT;
+		}
+	}
+	free_pages_exact(region, buf_size);
+	return 0;
+}
+
+/**
+ * @brief Set memory region of guest
+ *
+ * @param gzvm struct gzvm
+ * @param mem struct gzvm_userspace_memory_region: input from user
+ * @retval -EXIO memslot is out-of-range
+ * @retval -EFAULT  cannot find corresponding vma
+ * @retval -EINVAL  region size and vma size does not match
+ */

kerneldoc

+static int gzvm_vm_ioctl_set_memory_region(struct gzvm *gzvm,
+				struct gzvm_userspace_memory_region *mem)
+{
+	struct vm_area_struct *vma;
+	struct gzvm_memslot *memslot;
+	unsigned long size;
+	__u32 slot;
+
+	slot = mem->slot;
+	if (slot >= GZVM_MAX_MEM_REGION)
+		return -ENXIO;
+	memslot = &gzvm->memslot[slot];
+
+	vma = vma_lookup(gzvm->mm, mem->userspace_addr);
+	if (!vma)
+		return -EFAULT;
+
+	size = vma->vm_end - vma->vm_start;
+	if (size != mem->memory_size)
+		return -EINVAL;
+
+	memslot->base_gfn = __phys_to_pfn(mem->guest_phys_addr);
+	memslot->npages = size >> PAGE_SHIFT;
+	memslot->userspace_addr = mem->userspace_addr;
+	memslot->vma = vma;
+	memslot->flags = mem->flags;
+	memslot->slot_id = mem->slot;
+	return register_memslot_addr_range(gzvm, memslot);
+}
+
+static int gzvm_vm_enable_cap_hyp(struct gzvm *gzvm,
+				  struct gzvm_enable_cap *cap,
+				  struct arm_smccc_res *res)

Please don't introduce new functions doing just one call.

+{
+	int ret;
+
+	ret = gzvm_hypcall_wrapper(MT_HVC_GZVM_ENABLE_CAP, gzvm->vm_id,
+				   cap->cap, cap->args[0], cap->args[1],
+				   cap->args[2], cap->args[3], cap->args[4],
+				   res); > +	return ret;
+}
+
+/**
+ * @brief Get pvmfw size from hypervisor, return in x1, and return to userspace
+ *        in args[1].
+ * @retval 0 succeed
+ * @retval -EINVAL hypervisor return invalid results
+ * @retval -EFAULT fail to copy back to userspace buffer
+ */

kerneldoc ..... here and everywhere else, I will stop saying that every time.

+static int gzvm_vm_ioctl_get_pvmfw_size(struct gzvm *gzvm,
+					struct gzvm_enable_cap *cap,
+					void __user *argp)
+{
+	struct arm_smccc_res res = {0};
+
+	if (gzvm_vm_enable_cap_hyp(gzvm, cap, &res) != 0)
+		return -EINVAL;
+
+	cap->args[1] = res.a1;
+	if (copy_to_user(argp, cap, sizeof(*cap)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/**
+ * @brief Proceed GZVM_CAP_ARM_PROTECTED_VM's subcommands
+ * @retval 0 succeed
+ * @retval -EINVAL invalid subcommand or arguments
+ */
+static int gzvm_vm_ioctl_cap_pvm(struct gzvm *gzvm, struct gzvm_enable_cap *cap,
+				 void __user *argp)
+{
+	int ret = -EINVAL;
+	struct arm_smccc_res res = {0};
+
+	switch (cap->args[0]) {
+	case GZVM_CAP_ARM_PVM_SET_PVMFW_IPA:
+		ret = gzvm_vm_enable_cap_hyp(gzvm, cap, &res);
+		break;
+	case GZVM_CAP_ARM_PVM_GET_PVMFW_SIZE:
+		ret = gzvm_vm_ioctl_get_pvmfw_size(gzvm, cap, argp);
+		break;
+	default:
+		ret = -EINVAL;

		return -EINVAL;

+		break;
+	}
+
+	return ret;
+}
+
+static int gzvm_vm_ioctl_enable_cap(struct gzvm *gzvm,
+				    struct gzvm_enable_cap *cap,
+				    void __user *argp)
+{
+	int ret = -EINVAL;
+
+	switch (cap->cap) {
+	case GZVM_CAP_ARM_PROTECTED_VM:
+		ret = gzvm_vm_ioctl_cap_pvm(gzvm, cap, argp);
+		break;
+	default:
+		ret = -EINVAL;

		return -EINVAL;

+		break;
+	}
+
+	return ret;
+}
+
+/**
+ * @brief ioctl handler of VM FD
+ */
+static long gzvm_vm_ioctl(struct file *filp, unsigned int ioctl,
+			  unsigned long arg)
+{
+	long ret = -ENOTTY;
+	void __user *argp = (void __user *)arg;
+	struct gzvm *gzvm = filp->private_data;
+
+	switch (ioctl) {
+	case GZVM_CHECK_EXTENSION:
+		ret = gzvm_dev_ioctl_check_extension(gzvm, arg);
+		break;
+	case GZVM_CREATE_VCPU:
+		ret = gzvm_vm_ioctl_create_vcpu(gzvm, arg);
+		break;
+	case GZVM_SET_USER_MEMORY_REGION: {
+		struct gzvm_userspace_memory_region userspace_mem;
+
+		ret = -EFAULT;
+		if (copy_from_user(&userspace_mem, argp,
+						sizeof(userspace_mem)))
+			goto out;
+		ret = gzvm_vm_ioctl_set_memory_region(gzvm, &userspace_mem);
+		break;
+	}
+	case GZVM_ENABLE_CAP: {
+		struct gzvm_enable_cap cap;
+
+		ret = -EFAULT;
+		if (copy_from_user(&cap, argp, sizeof(cap)))
+			goto out;
+
+		ret = gzvm_vm_ioctl_enable_cap(gzvm, &cap, argp);
+		break;
+	}
+	default:
+		ret = -ENOTTY;

		return -ENOTTY;

+	}
+out:
+	return ret;
+}
+

..snip..

+
+static void gzvm_destroy_vm(struct gzvm *gzvm)
+{ > +	pr_info("VM-%u is going to be destroyed\n", gzvm->vm_id);

	dev_info() please.

+
+	mutex_lock(&gzvm->lock);
+
+	gzvm_destroy_vcpus(gzvm);
+	gzvm_destroy_vm_hyp(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,
+	.unlocked_ioctl = gzvm_vm_ioctl,
+	.llseek		= noop_llseek,
+};
+
+static int gzvm_create_vm_hyp(void)
+{
+	struct arm_smccc_res res;
+
+	gzvm_hypcall_wrapper(MT_HVC_GZVM_CREATE_VM, 0, 0, 0, 0, 0, 0, 0, &res);
+
+	if (res.a0 != 0)
+		return -EFAULT;
+	return res.a1;
+}
+
+static struct gzvm *gzvm_create_vm(unsigned long vm_type)
+{
+	int ret;
+	struct gzvm *gzvm;
+
+	gzvm = kzalloc(sizeof(struct gzvm), GFP_KERNEL);
+	if (!gzvm)
+		return ERR_PTR(-ENOMEM);
+
+	ret = gzvm_create_vm_hyp();
+	if (ret < 0)
+		goto err;

You're doing that only once in this function, so you don't need a label.

	if (ret) {
		kfree(gzvm);
		return ERR_PTR(ret);
	}

+
+	gzvm->vm_id = ret;
+	gzvm->mm = current->mm;
+	mutex_init(&gzvm->lock);
+	INIT_LIST_HEAD(&gzvm->devices);
+	mutex_init(&gzvm->irq_lock);
+	pr_info("VM-%u is created\n", gzvm->vm_id);
+
+	mutex_lock(&gzvm_list_lock);
+	list_add(&gzvm->vm_list, &gzvm_list);
+	mutex_unlock(&gzvm_list_lock);
+
+	return gzvm;
+
+err:
+	kfree(gzvm);
+	return ERR_PTR(ret);
+}
+
+/**
+ * @brief create vm fd
+ *
+ * @param vm_type
+ * @return int fd of vm, negative if error
+ */
+int gzvm_dev_ioctl_create_vm(unsigned long vm_type)
+{
+	struct gzvm *gzvm;
+	int ret;
+
+	gzvm = gzvm_create_vm(vm_type);
	if (IS_ERR(gzvm))
		return PTR_ERR(gzvm);

+	if (IS_ERR(gzvm)) {
+		ret = PTR_ERR(gzvm);
+		goto error;
+	}
+
+	ret = anon_inode_getfd("gzvm-vm", &gzvm_vm_fops, gzvm,
+			       O_RDWR | O_CLOEXEC);
	if (ret)
		return ret;

	return 0;
}


+	if (ret < 0)
+		goto error;
+
+error:
+	return ret;
+}

...but anyway, all of this must go to drivers/virt/.

Regards,
Angelo




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