linux-kernel - Re: [PATCH 0/2] selftests/nolibc: small simplification of test development phase

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Date:   Tue, 24 Jan 2023 00:31:01 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Willy Tarreau <w@....eu>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 0/2] selftests/nolibc: small simplification of test
 development phase

On Mon, Jan 23, 2023 at 06:20:16PM +0100, Willy Tarreau wrote:
> Ah now I think I understand Paul's question. I didn't know that the
> userland version was not always provided. I've always had both side
> by side.
> 
> > It would be great if we can avoid building qemu from the source. But if
> > not, let's go with that.
> 
> As Paul indicated, it's really trouble-free and I think I've only done
> that since the very first day I started to use QEMU, reason why I probably
> never noticed that not everything was packaged.
> 
> Then at least to respond to Paul, it could make sense to add a note that
> on some distros the userland version might not always be provided and
> might require a pretty simple rebuild of QEMU.

Ah well...

I figured it out. It turned qemu-user is a different package.
So I have "qemu-system" installed, but not "qemu-user".

Without building from source, just do this on Ubuntu:

  $ sudo apt-get install qemu-user -y
  ...
  Preparing to unpack .../qemu-user_1%3a6.2+dfsg-2ubuntu6.6_amd64.deb ...
  Unpacking qemu-user (1:6.2+dfsg-2ubuntu6.6) ...
  Selecting previously unselected package qemu-user-binfmt.
  Preparing to unpack .../qemu-user-binfmt_1%3a6.2+dfsg-2ubuntu6.6_amd64.deb ...
  Unpacking qemu-user-binfmt (1:6.2+dfsg-2ubuntu6.6) ...
  Setting up qemu-user (1:6.2+dfsg-2ubuntu6.6) ...
  Setting up qemu-user-binfmt (1:6.2+dfsg-2ubuntu6.6) ...
  Processing triggers for man-db (2.10.2-1) ...

  $ which qemu-x86_64
  /usr/bin/qemu-x86_64

  $ sudo make run-user
  MKDIR   sysroot/x86/include
  make[1]: Entering directory '/home/ammarfaizi2/work/linux.work.cc/tools/include/nolibc'
  make[2]: Entering directory '/home/ammarfaizi2/work/linux.work.cc'
  make[2]: Leaving directory '/home/ammarfaizi2/work/linux.work.cc'
  make[2]: Entering directory '/home/ammarfaizi2/work/linux.work.cc'
    INSTALL /home/ammarfaizi2/work/linux.work.cc/tools/testing/selftests/nolibc/sysroot/sysroot/include
  make[2]: Leaving directory '/home/ammarfaizi2/work/linux.work.cc'
  make[1]: Leaving directory '/home/ammarfaizi2/work/linux.work.cc/tools/include/nolibc'
    CC      nolibc-test
  83 test(s) passed.

Sorry for that. I didn't know that they come from different packages.
It works fine for me now.

-- 
Ammar Faizi