Modifying the Kernel Module

In the DaoCloud DC1000 hardware environment, the host kernel needs to be adapted for driver installation on the VM. Obtain the kernel source code in advance.

Obtain the kernel source code. See Table 4.
Decompress the kernel source code and go to the root directory.
```
unzip kernel-6.6.0-72.0.0.zip
cd kernel-6.6.0-72.0.0
```
Suppress the local version number.
1

touch .scmversion
Obtain the kernel patch file general.patch according to Software Requirements.
Apply the patch in the kernel source code directory kernel-6.6.0-72.0.0.
```
patch -p1 < general.patch
```
Generate a .config file in the source code directory.
```
cp /boot/config-`uname -r` .config
make menuconfig
```
On the displayed configuration page, select Load.
Select OK in the following page:

On the kernel configuration interface, configure the kernel compilation options listed in Table 1.

**Table 1** Kernel compilation options
Option	Required Value
LOCALVERSION	-patched-vm
DEBUG_INFO_BTF	N
SYSTEM_TRUSTED_KEYS	Clear the content. The configuration result should be: ( ) Additional X.509 keys for default system keyring

Configuration methods:

Press / for search.
Press Y to compile the selected item into the kernel. The corresponding item is displayed as [*].
Press N to exclude the selected item. The corresponding item is displayed as [].
Press M to compile the selected item into a module (in KO format). The corresponding item is displayed as <M>.
Press Enter to edit the selected item.
Press the corresponding number to select a search result.
After the modification is complete, select <Save> to save the modification.
After saving the modification, select <Exit> to exit.

Install dependencies and enable the LXCFS service. If you need to divide the command into multiple lines, add a backslash (\) at the end of each line.

yum install -y dwarves dpkg dpkg-devel openssl openssl-devel ncurses ncurses-devel bison flex bc libdrm build elfutils-libelf-devel docker lxc lxcfs lxcfs-tools git tar patch make gcc
systemctl start lxcfs
systemctl enable lxcfs

Compile the kernel code.
```
make -j72
```
Install the new kernel.
```
make modules_install 
make install
```

Set the boot kernel.

grub2-set-default 'openEuler (6.6.0-patched-vm) 24.03 (LTS-SP1)'

Reboot the server.
```
reboot
```
After the reboot, confirm that the kernel is switched to 6.6.0-patched-vm.
```
uname -r
```

Parent topic: Host Environment Configuration