Hello zithro,
thanks for the fast reply. I tried using xencov reset, I also tried to install Xen 4.4.4 on Debian 8 (Jessie) and Xen 4.7.6 on Ubuntu 16.04 but unfortunately I had the same problem with the xencov read.
I too am afraid that the coverage support on the older versions is slightly buggy.
Thank you for the guide you linked, that one is a reference for the new versions. I also have a machine with Xen 4.16 where the coverage support works fine.
Unfortunately, there are no Kconfig files with the CONFIG_COVERAGE option in the old versions. The older versions used a macro called TEST_COVERAGE that had the same purpose but was a little different.
I will continue to look for patches in hopes of solving it.
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Today's Topics:
1. Re: Xen 4.4.2, coverage does not work properly (zithro)
----------------------------------------------------------------------
Message: 1
Date: Thu, 4 May 2023 23:39:25 +0200
From: zithro <slack@xxxxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: Xen 4.4.2, coverage does not work properly
Message-ID: <2005246c-531c-d207-a293-05d04b75cefe@xxxxxxxxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 02 May 2023 14:23, Giuseppe De Rosa wrote:
> 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 I apologize for asking for help on such an outdated version of Xen.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.
>
>
Maybe look for more 4.4 bug reports about coverage, as another patch is
needed ?
I found that they almost totally rewrote coverage in 4.7.
The current man page about coverage
(https://xenbits.xen.org/docs/unstable/hypervisor-guide/code-coverage.html)
is a bit different.
"enable CONFIG_COVERAGE in Kconfig".
(mentionned in
"https://lists.xenproject.org/archives/html/xen-devel/2016-08/msg03363.html").
There's also "xencov reset".
But honestly this is above me. Maybe try the xen-devel ML ?
PS: at first I thought your post was a prank, but no, just discovered
"xl li == xl lis == xl list" ! Why not "xl l" though ^^
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