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Xen 4.4.2, coverage does not work properly

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From: Giuseppe De Rosa <giuseppe.de.rosa@xxxxxxxxxx>

Date: Tue, 2 May 2023 12:23:44 +0000

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Thread-topic: Xen 4.4.2, coverage does not work properly

Hello everybody,

I apologize for asking for help on such an outdated version of Xen. I would like to understand why xencov read always returns the same dat file as shown in the attached file.

I followed this guide https://wiki.xenproject.org/index.php?title=Compiling_Xen_From_Source&oldid=17237 (14 September 2016 version) to compile Xen from source and this guide to enable coverage support https://xenbits.xen.org/docs/4.8-testing/misc/coverage.html. I also applied this patch https://lists.xenproject.org/archives/html/xen-devel/2016-08/msg03353.html because I had some compilation errors.

Everything went fine until I used xencov read. The result is always the same (4 bytes returned, always .CTX) but the file is malformed because xencov_split cannot read that.

I am using Ubuntu 14.04. I made sure to enable test coverage support under xen/Config.mk and gcov under tools/qemu-xen/configure. I checked the compilation logs and every file was instrumented with the -ftest-coverage option.

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