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QEMU LINUX INSTALL
QEMU LINUX DRIVERS

To create an environment, we use Ubuntu 16.04 as the host operating system and Ubuntu 16.04 as the guest operating system. The host is an operating system where debugging is taking place. The guest is a Libvirt or QEMU-style virtual machine that we’ll debug. First of all, you need to set up the guest target. To conduct kernel debugging, you should prepare the necessary environment. You can either use one of these levels or dig deep and go through the whole process of kernel debugging. We’ll provide you with step-by-step instructions on how you can find errors in your Linux kernel module or kernel image at the development stage.

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Then, doing make -j$(nproc) bzImage is sufficient.How to Debug the Linux Kernel with QEMU and Libvirt

Cryptographic API $\rightarrow$ Certificates for signature checking $\rightarrow$ Provide system-wide ring of trusted keys, change the additional key string in the line below to EMPTY.

If you are not attempting to build a deb package for installation on bare-metal machine, but just want a bzImage of the kernel (to boot in QEMU, etc.), then set the trusted key option to empty through menuconfig: deb packages in the upper level folder, i.e., the folder that contains the Linux source root folder. After successful compilation, you will find several. This will take quite a while to build (~ 20-60 minutes). # LOCALVERSION is the suffix to be concatenated to upstream kernel version # KDEB_PKGVERSION is the suffix for the compiled. Make -j $( nproc ) LOCALVERSION = -some-suffix KDEB_PKGVERSION =1.some-suffix deb-pkg To build the kernel into an installable deb package, follow these steps: Save the tweaked config to default location.

Enable loadable modules support $\rightarrow$ Module unloading - Forced module unloading.

Binary Emulations $\rightarrow$ x32 ABI for 64-bit mode, turn this OFF.

If you are later going to play with custom kernel modules, these changes will also be necessary/helpful: a device driver, to bloat the kernel, but want it to be loadable after booting up whenever needed

: selected as a kernel module - will be built as a loadable kernel module instead of bulit-in this is useful when you don’t want the feature, e.g.

: selected as built-in - will be built within the monolithic kernel.

QEMU LINUX DRIVERS

Device drivers $\rightarrow$ Block devices $\rightarrow$ Virtio block driver Ī kernel module’s menu option may have three states:.Device drivers $\rightarrow$ Network device support $\rightarrow$ Virtio network driver.If you are later going to run & debug with QEMU, these options must be selected as built-in: Tweak any options you need (e.g., turning off KPTI, KASLR, …). # Tweak options & save the config to default name # If you are later going to run with QEMU, make sure to # read the paragraphs below.Ī graphical menu should now pop up in the terminal.

QEMU LINUX INSTALL

This workflow has been tested on x86_64 arch, Ubuntu 18.04/20.04 LTS, with Linux kernel versions 4.1 - 5.15.įirst, install the required dependencies (common things shipped with Ubuntu are not listed here):Ĭd linux-v.x.y # The root folder of the Linux source. This post lists a successful workflow of building and installing a custom Linux kernel under a Ubuntu 18.04/20.04 environment (deb), along with steps to debug the Linux kernel by running it over the QEMU emulator and attaching to GDB. When doing systems research, we sometimes need to modify/add new stuff into the Linux kernel. Hosted on GitHub Pages - Theme by orderedlist Building a Custom Linux Kernel & Debugging via QEMU + GDB Guanzhou's personal storage for lecture notes, blog posts, & good mood.