103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* TDX guest user interface driver
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*
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* Copyright (C) 2022 Intel Corporation
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*/
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <uapi/linux/tdx-guest.h>
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#include <asm/cpu_device_id.h>
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#include <asm/tdx.h>
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static long tdx_get_report0(struct tdx_report_req __user *req)
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{
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u8 *reportdata, *tdreport;
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long ret;
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reportdata = kmalloc(TDX_REPORTDATA_LEN, GFP_KERNEL);
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if (!reportdata)
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return -ENOMEM;
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tdreport = kzalloc(TDX_REPORT_LEN, GFP_KERNEL);
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if (!tdreport) {
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ret = -ENOMEM;
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goto out;
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}
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if (copy_from_user(reportdata, req->reportdata, TDX_REPORTDATA_LEN)) {
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ret = -EFAULT;
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goto out;
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}
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/* Generate TDREPORT0 using "TDG.MR.REPORT" TDCALL */
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ret = tdx_mcall_get_report0(reportdata, tdreport);
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if (ret)
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goto out;
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if (copy_to_user(req->tdreport, tdreport, TDX_REPORT_LEN))
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ret = -EFAULT;
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out:
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kfree(reportdata);
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kfree(tdreport);
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return ret;
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}
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static long tdx_guest_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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switch (cmd) {
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case TDX_CMD_GET_REPORT0:
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return tdx_get_report0((struct tdx_report_req __user *)arg);
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default:
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return -ENOTTY;
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}
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}
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static const struct file_operations tdx_guest_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = tdx_guest_ioctl,
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.llseek = no_llseek,
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};
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static struct miscdevice tdx_misc_dev = {
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.name = KBUILD_MODNAME,
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.minor = MISC_DYNAMIC_MINOR,
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.fops = &tdx_guest_fops,
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};
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static const struct x86_cpu_id tdx_guest_ids[] = {
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X86_MATCH_FEATURE(X86_FEATURE_TDX_GUEST, NULL),
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, tdx_guest_ids);
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static int __init tdx_guest_init(void)
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{
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if (!x86_match_cpu(tdx_guest_ids))
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return -ENODEV;
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return misc_register(&tdx_misc_dev);
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}
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module_init(tdx_guest_init);
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static void __exit tdx_guest_exit(void)
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{
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misc_deregister(&tdx_misc_dev);
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}
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module_exit(tdx_guest_exit);
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MODULE_AUTHOR("Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>");
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MODULE_DESCRIPTION("TDX Guest Driver");
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MODULE_LICENSE("GPL");
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