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Re: [Xen-devel] [PATCH 09/14] livepatch: Add per-function applied/reverted state tracking marker

On 22. Aug 2019, at 12:43, Julien Grall <julien.grall@xxxxxxx> wrote:


On 22/08/2019 11:20, Wieczorkiewicz, Pawel wrote:


Cross-compiler are nowadays widely available. So build testing your changes in common code would be the minimum.

I wish it was that simple. Nevertheless, I will try to prepare an environment to perform such builds.

Cross-compiling the hypervisor is really easy ;).

1) Download the cross-compiler tarball (here one [1]) and uncompress it. You can also install the one provided by your distro.

2) Build Xen hypervisor. Here an example for arm64:

42sh> cd xen.git/xen
42sh> make XEN_TARGET_ARCH=arm64 CROSS_COMPILER=<triplet>-

In my case, I am using the Arm toolchain AArch64 GNU/Linux target (aarch64-linux-gnu). So the <triplet> would be aarch64-linux-gnu.

This is assuming you have the compilers binary in your PATH. If not, you can use give the full path:


Awesome! That really works (especially thanks for the [1] link… finally some toolstack that works on my system).

One change was needed: s/CROSS_COMPILER/CROSS_COMPILE/g


Having this in a wiki would really help. Or have I missed it?

In this case, as you dropped the const from the prototype, you will need to do the same in the declaration.

Yes, but I see 2 options here:
- Enable the feature also for Arm (I prefer that, but will not be able to test that in nearest future)

I think some of the code can be made common. So we could possibly rely on x86 for that. Additionally, IIRC, Konrad has a setup on the cubietruck for testing livepatch.

Yes, I will do that.

- Keep Arm excluded and sprinkle code with #ifdef CONFIG_X86

Please no #ifdef CONFIG_X86 in the common code. If you don't plan to support Arm, then we should introduce a new Kconfig that will gate all those changes.

Ugh, you’re right. Removing all that from common code.

Best Regards,
Pawel Wieczorkiewicz

Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Ralf Herbrich
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
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