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https://github.com/memflow/memflow-kvm
Linux kernel module for memflow's KVM connector
https://github.com/memflow/memflow-kvm
Last synced: about 1 month ago
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Linux kernel module for memflow's KVM connector
- Host: GitHub
- URL: https://github.com/memflow/memflow-kvm
- Owner: memflow
- License: mit
- Created: 2020-07-07T15:05:24.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2024-10-04T18:27:32.000Z (2 months ago)
- Last Synced: 2024-10-19T14:01:39.733Z (about 2 months ago)
- Language: C
- Size: 109 KB
- Stars: 38
- Watchers: 5
- Forks: 8
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-qubes-os - Kvm - KVM memflow connector. (Exploitation Tools / Unikernel-like)
README
# memflow's KVM connector and its driver
This is a connector for Kernel based virtual machines, by using a driver that maps all KVM pages into the memflow process (userspace -> userspace DMA).
`memflow-kmod` includes the kernel module that performs the operations.
`memflow-kvm-ioctl` provides a rust based IOCTL api to the kernel module.
`memflow-kvm` provides a memflow physical memory connector that uses the ioctl.
## Setup
#### Connector
Recommended way is to use [memflowup](https://github.com/memflow/memflowup).
#### Kernel module
**Your kernel must be compiled with `CONFIG_KALLSYMS=y`, and `CONFIG_KALLSYMS_ALL=y` being set in kconfig.**
By default [memflowup](https://github.com/memflow/memflowup) will install the latest kernel module automatically.
Stable versions are available under [releases](https://github.com/memflow/memflow-kvm/releases).
Debian/Ubuntu package can be installed with `sudo dpkg -i memflow-dkms_${VERSION}_amd64.deb`, where `VERSION` is the version of the downloaded module.
For other distributions, run this command:
```
sudo dkms install --archive=memflow-${VERSION}-source-only.dkms.tar.gz
```
It might be necessary to also load the module at runtime:
```
modprobe memflow
```
To load the module at startup create a new file in `/etc/modules-load.d/`:
```
/etc/modules-load.d/memflow-kvm.conf
---
# Load memflow-kvm module on startup
memflow
```
The simplest way to setup the kernel module is to create a new group called `memflow` and use a udev rule to set access rights to `/dev/memflow` automatically when the module is being loaded:
```
groupadd memflow
usermod -a -G memflow $USER
```
Then create the udev rule in `/etc/udev/rules.d/`:
```
/etc/udev/rules.d/99-memflow-kvm.rules
---
KERNEL=="memflow" SUBSYSTEM=="misc" GROUP="memflow" MODE="0660"
```
## Manual installation
#### Connector
Install the connector using `memflowup build --name memflow-kvm`. This will compile the connector in release mode and place it under `~/.local/lib/memflow/` directory, which can then be accessed by memflow clients. Do copy out the underlying shared library to `/usr/local/lib/memflow/` if you want to use it across all users.
#### Kernel module
Initialize submodules:
```
git submodule update --init
```
Run `make`. output will be placed in `memflow-kmod/memflow.ko`.
Then to install the module:
```
source dkms.conf
sudo mkdir /usr/src/$BUILT_MODULE_NAME-$PACKAGE_VERSION
sudo cp -r * /usr/src/$BUILT_MODULE_NAME-$PACKAGE_VERSION
sudo dkms build -m $BUILT_MODULE_NAME -v $PACKAGE_VERSION
sudo dkms install -m $BUILT_MODULE_NAME -v $PACKAGE_VERSION
```
Then you can load the module:
```
sudo modprobe memflow
```
## FAQ
Q. I'm getting this warning:
```
warning: couldn't execute `llvm-config --prefix` (error: No such file or directory (os error 2))
warning: set the LLVM_CONFIG_PATH environment variable to the full path to a valid `llvm-config` executable (including the executable itself)
```
A. This warning is harmless and can be safely ignored.
## Licensing note
While `memflow-kvm-ioctl`, and `memflow-kvm` are licensed under the `MIT` license, `memflow-kmod` is licensed only under `GPL-2`.