msr.c (75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37) msr.c (aefcf2f4b58155d27340ba5f9ddbe9513da8286d)
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* ----------------------------------------------------------------------- *
3 *
4 * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved
5 * Copyright 2009 Intel Corporation; author: H. Peter Anvin
6 *
7 * ----------------------------------------------------------------------- */
8

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29#include <linux/smp.h>
30#include <linux/major.h>
31#include <linux/fs.h>
32#include <linux/device.h>
33#include <linux/cpu.h>
34#include <linux/notifier.h>
35#include <linux/uaccess.h>
36#include <linux/gfp.h>
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* ----------------------------------------------------------------------- *
3 *
4 * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved
5 * Copyright 2009 Intel Corporation; author: H. Peter Anvin
6 *
7 * ----------------------------------------------------------------------- */
8

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29#include <linux/smp.h>
30#include <linux/major.h>
31#include <linux/fs.h>
32#include <linux/device.h>
33#include <linux/cpu.h>
34#include <linux/notifier.h>
35#include <linux/uaccess.h>
36#include <linux/gfp.h>
37#include <linux/security.h>
37
38#include <asm/cpufeature.h>
39#include <asm/msr.h>
40
41static struct class *msr_class;
42static enum cpuhp_state cpuhp_msr_state;
43
44static ssize_t msr_read(struct file *file, char __user *buf,

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74{
75 const u32 __user *tmp = (const u32 __user *)buf;
76 u32 data[2];
77 u32 reg = *ppos;
78 int cpu = iminor(file_inode(file));
79 int err = 0;
80 ssize_t bytes = 0;
81
38
39#include <asm/cpufeature.h>
40#include <asm/msr.h>
41
42static struct class *msr_class;
43static enum cpuhp_state cpuhp_msr_state;
44
45static ssize_t msr_read(struct file *file, char __user *buf,

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75{
76 const u32 __user *tmp = (const u32 __user *)buf;
77 u32 data[2];
78 u32 reg = *ppos;
79 int cpu = iminor(file_inode(file));
80 int err = 0;
81 ssize_t bytes = 0;
82
83 err = security_locked_down(LOCKDOWN_MSR);
84 if (err)
85 return err;
86
82 if (count % 8)
83 return -EINVAL; /* Invalid chunk size */
84
85 for (; count; count -= 8) {
86 if (copy_from_user(&data, tmp, 8)) {
87 err = -EFAULT;
88 break;
89 }

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125 if (!(file->f_mode & FMODE_WRITE)) {
126 err = -EBADF;
127 break;
128 }
129 if (copy_from_user(&regs, uregs, sizeof(regs))) {
130 err = -EFAULT;
131 break;
132 }
87 if (count % 8)
88 return -EINVAL; /* Invalid chunk size */
89
90 for (; count; count -= 8) {
91 if (copy_from_user(&data, tmp, 8)) {
92 err = -EFAULT;
93 break;
94 }

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130 if (!(file->f_mode & FMODE_WRITE)) {
131 err = -EBADF;
132 break;
133 }
134 if (copy_from_user(&regs, uregs, sizeof(regs))) {
135 err = -EFAULT;
136 break;
137 }
138 err = security_locked_down(LOCKDOWN_MSR);
139 if (err)
140 break;
133 err = wrmsr_safe_regs_on_cpu(cpu, regs);
134 if (err)
135 break;
136 if (copy_to_user(uregs, &regs, sizeof(regs)))
137 err = -EFAULT;
138 break;
139
140 default:

--- 99 unchanged lines hidden --- 		141 err = wrmsr_safe_regs_on_cpu(cpu, regs);
142 if (err)
143 break;
144 if (copy_to_user(uregs, &regs, sizeof(regs)))
145 err = -EFAULT;
146 break;
147
148 default:

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