Il 27/07/23 09:59, Yi-De Wu ha scritto:
From: "Yingshiuan Pan" <yingshiuan.pan@xxxxxxxxxxxx>
GenieZone is MediaTek 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 and destroy) on GenieZone.
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 | 6 +
arch/arm64/Kbuild | 1 +
arch/arm64/geniezone/Makefile | 9 +
arch/arm64/geniezone/gzvm_arch_common.h | 68 ++++
arch/arm64/geniezone/vm.c | 212 +++++++++++++
arch/arm64/include/uapi/asm/gzvm_arch.h | 20 ++
drivers/virt/Kconfig | 2 +
drivers/virt/geniezone/Kconfig | 16 +
drivers/virt/geniezone/Makefile | 10 +
drivers/virt/geniezone/gzvm_main.c | 143 +++++++++
drivers/virt/geniezone/gzvm_vm.c | 400 ++++++++++++++++++++++++
include/linux/gzvm_drv.h | 90 ++++++
include/uapi/asm-generic/Kbuild | 1 +
include/uapi/asm-generic/gzvm_arch.h | 10 +
include/uapi/linux/gzvm.h | 76 +++++
15 files changed, 1064 insertions(+)
create mode 100644 arch/arm64/geniezone/Makefile
create mode 100644 arch/arm64/geniezone/gzvm_arch_common.h
create mode 100644 arch/arm64/geniezone/vm.c
create mode 100644 arch/arm64/include/uapi/asm/gzvm_arch.h
create mode 100644 drivers/virt/geniezone/Kconfig
create mode 100644 drivers/virt/geniezone/Makefile
create mode 100644 drivers/virt/geniezone/gzvm_main.c
create mode 100644 drivers/virt/geniezone/gzvm_vm.c
create mode 100644 include/linux/gzvm_drv.h
create mode 100644 include/uapi/asm-generic/gzvm_arch.h
create mode 100644 include/uapi/linux/gzvm.h
diff --git a/MAINTAINERS b/MAINTAINERS
index bfbfdb790446..b91d41dd2f2f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8747,6 +8747,12 @@ M: Ze-Yu Wang <ze-yu.wang@xxxxxxxxxxxx>
M: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx>
F: Documentation/devicetree/bindings/hypervisor/mediatek,geniezone-hyp.yaml
F: Documentation/virt/geniezone/
+F: arch/arm64/geniezone/
+F: arch/arm64/include/uapi/asm/gzvm_arch.h
+F: drivers/virt/geniezone/
+F: include/linux/gzvm_drv.h
+F include/uapi/asm-generic/gzvm_arch.h
+F: include/uapi/linux/gzvm.h
GENWQE (IBM Generic Workqueue Card)
M: Frank Haverkamp <haver@xxxxxxxxxxxxx>
diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild
index 5bfbf7d79c99..0c3cca572919 100644
--- a/arch/arm64/Kbuild
+++ b/arch/arm64/Kbuild
@@ -4,6 +4,7 @@ obj-$(CONFIG_KVM) += kvm/
obj-$(CONFIG_XEN) += xen/
obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/
obj-$(CONFIG_CRYPTO) += crypto/
+obj-$(CONFIG_MTK_GZVM) += geniezone/
# for cleaning
subdir- += boot
diff --git a/arch/arm64/geniezone/Makefile b/arch/arm64/geniezone/Makefile
new file mode 100644
index 000000000000..2957898cdd05
--- /dev/null
+++ b/arch/arm64/geniezone/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Main Makefile for gzvm, this one includes drivers/virt/geniezone/Makefile
+#
+include $(srctree)/drivers/virt/geniezone/Makefile
+
+gzvm-y += vm.o
+
+obj-$(CONFIG_MTK_GZVM) += gzvm.o
diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
new file mode 100644
index 000000000000..fdb95d619102
--- /dev/null
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#ifndef __GZVM_ARCH_COMMON_H__
+#define __GZVM_ARCH_COMMON_H__
+
+#include <linux/arm-smccc.h>
+
+enum {
+ GZVM_FUNC_CREATE_VM = 0,
+ GZVM_FUNC_DESTROY_VM = 1,
+ GZVM_FUNC_CREATE_VCPU = 2,
+ GZVM_FUNC_DESTROY_VCPU = 3,
+ GZVM_FUNC_SET_MEMREGION = 4,
+ GZVM_FUNC_RUN = 5,
+ GZVM_FUNC_GET_ONE_REG = 8,
+ GZVM_FUNC_SET_ONE_REG = 9,
+ GZVM_FUNC_IRQ_LINE = 10,
+ GZVM_FUNC_CREATE_DEVICE = 11,
+ GZVM_FUNC_PROBE = 12,
+ GZVM_FUNC_ENABLE_CAP = 13,
+ NR_GZVM_FUNC,
+};
+
+#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_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)
+
+/**
+ * gzvm_hypcall_wrapper() - the wrapper for hvc calls
+ * @a0-a7: arguments passed in registers 0 to 7
+ * @res: result values from registers 0 to 3
+ *
+ * Return: The wrapper helps caller to convert geniezone errno to Linux errno.
+ */
+static inline 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)
+{
+ arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
+ return gzvm_err_to_errno(res->a0);
+}
+
+static inline u16 get_vmid_from_tuple(unsigned int tuple)
+{
+ return (u16)(tuple >> 16);
+}
+
+#endif /* __GZVM_ARCH_COMMON_H__ */
diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
new file mode 100644
index 000000000000..e35751b21821
--- /dev/null
+++ b/arch/arm64/geniezone/vm.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <asm/sysreg.h>
+#include <linux/arm-smccc.h>
+#include <linux/err.h>
+#include <linux/uaccess.h>
+
+#include <linux/gzvm.h>
+#include <linux/gzvm_drv.h>
+#include "gzvm_arch_common.h"
+
+#define PAR_PA47_MASK ((((1UL << 48) - 1) >> 12) << 12)
+
+int gzvm_arch_probe(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)
+ return 0;
+
+ return -ENXIO;
+}
+
+int gzvm_arch_set_memregion(u16 vm_id, size_t buf_size,
+ phys_addr_t region)
+{
+ struct arm_smccc_res res;
+
+ return gzvm_hypcall_wrapper(MT_HVC_GZVM_SET_MEMREGION, vm_id,
+ buf_size, region, 0, 0, 0, 0, &res);
+}
+
+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;
+}
+
+int gzvm_arch_check_extension(struct gzvm *gzvm, __u64 cap, void __user *argp)
+{
+ int ret = -EOPNOTSUPP;
int ret;
+
+ switch (cap) {
+ case GZVM_CAP_ARM_PROTECTED_VM: {
+ __u64 success = 1;
+
+ if (copy_to_user(argp, &success, sizeof(__u64)))
+ return -EFAULT;
+ ret = 0;
here, instead of ret = 0...
return 0;
+ break;
+ }
+ case GZVM_CAP_ARM_VM_IPA_SIZE: {
+ ret = gzvm_cap_arm_vm_ipa_size(argp);
and here
return ret;
+ break;
+ }
+ default:
+ ret = -EOPNOTSUPP;
break;
+ }
+
return -EOPNOTSUPP;
+ return ret;
+}
+
+/**
+ * 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;
+ if (ret == 0)
+ return res.a1;
+ else
+ return ret;
+}
+
+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);
+}
+
+static int gzvm_vm_arch_enable_cap(struct gzvm *gzvm,
+ struct gzvm_enable_cap *cap,
+ struct arm_smccc_res *res)
+{
+ return 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);
+}
+
+/**
+ * gzvm_vm_ioctl_get_pvmfw_size() - Get pvmfw size from hypervisor, return
+ * in x1, and return to userspace in args
+ * @gzvm: Pointer to struct gzvm.
+ * @cap: Pointer to struct gzvm_enable_cap.
+ * @argp: Pointer to struct gzvm_enable_cap in user space.
+ *
+ * Return:
+ * * 0 - Succeed
+ * * -EINVAL - Hypervisor return invalid results
+ * * -EFAULT - Fail to copy back to userspace buffer
+ */
+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_arch_enable_cap(gzvm, cap, &res) != 0)
+ return -EINVAL;
+
+ cap->args[1] = res.a1;
+ if (copy_to_user(argp, cap, sizeof(*cap)))
+ return -EFAULT;
+
+ return 0;
+}
+
+/**
+ * gzvm_vm_ioctl_cap_pvm() - Proceed GZVM_CAP_ARM_PROTECTED_VM's subcommands
+ * @gzvm: Pointer to struct gzvm.
+ * @cap: Pointer to struct gzvm_enable_cap.
+ * @argp: Pointer to struct gzvm_enable_cap in user space.
+ *
+ * Return:
+ * * 0 - Succeed
+ * * -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};
Invert for readability; struct arm_smccc_res res first, ret last...
also, you don't need to initialize ret to -EINVAL, because:
+
+ switch (cap->args[0]) {
+ case GZVM_CAP_ARM_PVM_SET_PVMFW_IPA:
+ fallthrough;
+ case GZVM_CAP_ARM_PVM_SET_PROTECTED_VM:
+ ret = gzvm_vm_arch_enable_cap(gzvm, cap, &res);
return ret;
+ break;
+ case GZVM_CAP_ARM_PVM_GET_PVMFW_SIZE:
+ ret = gzvm_vm_ioctl_get_pvmfw_size(gzvm, cap, argp);
return ret;
+ break;
+ default:
just break here
+ ret = -EINVAL;
+ break;
+ }
+
return -EINVAL;
+ return ret;
+}
+
+int gzvm_vm_ioctl_arch_enable_cap(struct gzvm *gzvm,
+ struct gzvm_enable_cap *cap,
+ void __user *argp)
+{
+ int ret = -EINVAL;
same comments here
+
+ switch (cap->cap) {
+ case GZVM_CAP_ARM_PROTECTED_VM:
+ ret = gzvm_vm_ioctl_cap_pvm(gzvm, cap, argp);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * gzvm_hva_to_pa_arch() - converts hva to pa with arch-specific way
+ * @hva: Host virtual address.
+ *
+ * Return: 0 if translation error
+ */
+u64 gzvm_hva_to_pa_arch(u64 hva)
+{
+ u64 par;
+ unsigned long flags;
unsigned long flags;
u64 par;
+
+ local_irq_save(flags);
+ asm volatile("at s1e1r, %0" :: "r" (hva));
+ isb();
+ par = read_sysreg_par();
+ local_irq_restore(flags);
+
+ if (par & SYS_PAR_EL1_F)
+ return 0;
+
+ return par & PAR_PA47_MASK;
+}
..snip..
diff --git a/drivers/virt/geniezone/gzvm_main.c b/drivers/virt/geniezone/gzvm_main.c
new file mode 100644
index 000000000000..b629b41a0cd9
--- /dev/null
+++ b/drivers/virt/geniezone/gzvm_main.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/anon_inodes.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 <linux/gzvm_drv.h>
+
..snip..
+
+static long gzvm_dev_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long user_args)
+{
+ long ret = -ENOTTY;
long ret;
+
+ switch (cmd) {
+ case GZVM_CREATE_VM:
+ ret = gzvm_dev_ioctl_create_vm(user_args);
you may even do just
return 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);
return ....
+ break;
+ default:
break...
+ ret = -ENOTTY;
+ }
...return
+
+ 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 = KBUILD_MODNAME,
+ .fops = &gzvm_chardev_ops,
+};
+
+static int gzvm_drv_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ if (gzvm_arch_probe() != 0) {
+ dev_err(&pdev->dev, "Not found available conduit\n");
+ return -ENODEV;
+ }
+
+ ret = misc_register(&gzvm_dev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int gzvm_drv_remove(struct platform_device *pdev)
+{
+ gzvm_destroy_all_vms();
+ misc_deregister(&gzvm_dev);
+ return 0;
+}
+
+static const struct of_device_id gzvm_of_match[] = {
+ { .compatible = "mediatek,geniezone-hyp", },
Remove the comma after "mediatek,geniezone-hyp" as it's not needed.
+ {/* sentinel */},
+};
+
+static struct platform_driver gzvm_driver = {
+ .probe = gzvm_drv_probe,
+ .remove = gzvm_drv_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .owner = THIS_MODULE,
+ .of_match_table = gzvm_of_match,
+ },
+};
+
+module_platform_driver(gzvm_driver);
+
+MODULE_DEVICE_TABLE(of, gzvm_of_match);
+MODULE_AUTHOR("MediaTek");
+MODULE_DESCRIPTION("GenieZone interface for VMM");
+MODULE_LICENSE("GPL");
diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
new file mode 100644
index 000000000000..ee751369fd4b
--- /dev/null
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -0,0 +1,400 @@
+// 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/gzvm_drv.h>
+
+static DEFINE_MUTEX(gzvm_list_lock);
+static LIST_HEAD(gzvm_list);
+
+/**
+ * hva_to_pa_fast() - converts hva to pa in generic fast way
+ * @hva: Host virtual address.
+ *
+ * Return: 0 if translation error
+ */
+static u64 hva_to_pa_fast(u64 hva)
+{
+ struct page *page[1];
+
Remove extra blank line
+ u64 pfn;
+
+ if (get_user_page_fast_only(hva, 0, page)) {
+ pfn = page_to_phys(page[0]);
+ put_page((struct page *)page);
+ return pfn;
why the else branch? just do...
if (get_user_page_fast_only(.....)) {
do_something; return pfn;
}
return 0;
}
+ } else {
+ return 0;
+ }
+}
+
+/**
+ * hva_to_pa_slow() - note that this function may sleep
/**
* hva_to_pa_slow() - converts hva to pa in a slow way
* @hva: Host virtual address
*
* This function converts HVA to PA in a slow way (because......)
*
* Context: This function may sleep
* Return: PA or 0 for translation error
*/
+ * @hva: Host virtual address.
+ *
+ * Return: 0 if translation error
+ */
+static u64 hva_to_pa_slow(u64 hva)
+{
+ struct page *page;
+ int npages;
+ u64 pfn;
+
+ npages = get_user_pages_unlocked(hva, 1, &page, 0);
+ if (npages != 1)
+ return 0;
+
+ pfn = page_to_phys(page);
+ put_page(page);
+
+ return pfn;
+}
+
..snip..
+
+/* register_memslot_addr_range() - Register memory region to GZ */
/**
* register_memslot_addr_range() - Register memory region to GenieZone
* @gzvm: xxxx
* @memslot: xxxx
*
* Return: something
*/
+static int
+register_memslot_addr_range(struct gzvm *gzvm, struct gzvm_memslot *memslot)
+{
+ struct gzvm_memory_region_ranges *region;
+ u32 buf_size;
u32 buf_size = PAGE_SIZE * 2;
+ int max_nr_consti, remain_pages;
+ u64 gfn, gfn_end;
+
+ 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) {
+ int nr_pages;
int nr_pages = fill_constituents(...)
+
+ nr_pages = fill_constituents(region->constituents,
+ ®ion->constituent_cnt,
+ max_nr_consti, gfn,
+ remain_pages, memslot);
+ if (nr_pages < 0) {
+ pr_err("Failed to fill constituents\n");
+ free_pages_exact(region, buf_size);
+ return nr_pages;
+ }
+ region->gpa = PFN_PHYS(gfn);
+ region->total_pages = nr_pages;
+
+ remain_pages -= nr_pages;
+ gfn += nr_pages;
+
+ if (gzvm_arch_set_memregion(gzvm->vm_id, buf_size,
+ virt_to_phys(region))) {
+ pr_err("Failed to register memregion to hypervisor\n");
+ free_pages_exact(region, buf_size);
+ return -EFAULT;
+ }
+ }
+ free_pages_exact(region, buf_size);
+ return 0;
+}
+
+/**
+ * gzvm_vm_ioctl_set_memory_region() - Set memory region of guest
+ * @gzvm: Pointer to struct gzvm.
+ * @mem: Input memory region from user.
+ *
+ * Return:
* Return: 0 for success, negative number for error
*
* -EXIO - The memslot is out-of-range
* -EFAULT - Cannot find corresponding vma
* -EINVAL - Region size and VMA size mismatch
*/
+ * * -EXIO - memslot is out-of-range
+ * * -EFAULT - Cannot find corresponding vma
+ * * -EINVAL - region size and vma size does not match
+ */
+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);
+}
+
There are other instances of the same for all comments in this review, so
fix accordingly everywhere else.
Regards,
Angelo
