Hi Everyone,

I'm happy to announce that we have just completed testing of the
gem5-specific patches for Linux 4.14 and 4.15. The new kernel sources
can be downloaded from the gem5/v4.14 [1] and gem5/v4.15 branches in the
arm/linux [3] project on Gerrit. Most users should prefer the 4.14
kernel as this is the latest LTS release of Linux. See the wiki [4] for
build instructions.

The kernels comes with default configurations for Armv7 and Armv8 and
has the same set of gem5-specific patches as the older 4.x kernels.
These patches add support for:

  * gem5's GICv2 extensions. This enables support for up to 255 CPUs if
the gem5 extensions are enabled in the GIC (set gem5_extensions to True
in your configuration script).
  * A virtual DRM connector. This makes it possible to use gem5's
display models without a proper HDMI encoder model.
  * The custom FBIOGET_DMABUF IOCTL. This change is useful to avoid a
CPU-side memcpy between the GPU's render buffer and the framebuffer for
Android setups that using NoMali.
  * gem5's DVFS controller.
  * General gem5 instrumentation.

Additionally, the upstream 4.15 kernel includes support for the Arm
Scalable Vector Extensions (SVE) that can be used with the beta
implementation of SVE for gem5 [5].

Known issues:

 * Recent Linux kernels don't expose the task struct in thread_info.
This affects gem5's instrumentation. Some of the Streamline support in
gem5 likely needs to be updated to support new kernels.

If you need to post any new kernel changes, please make sure to post
them to the gem5/v4.14 branch on gerrit.


[1] https://gem5.googlesource.com/arm/linux/+/refs/heads/gem5/v4.14
[2] https://gem5.googlesource.com/arm/linux/+/refs/heads/gem5/v4.15
[3] https://gem5-review.googlesource.com/#/admin/projects/arm/linux
[4] http://gem5.org/ARM_Kernel
[5] https://gem5-review.googlesource.com/#/admin/projects/arm/gem5,branches
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