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torture: Remove qemu dependency on EFI firmware 

On some (probably misconfigured) systems, the torture-test scripting
will cause qemu to complain about missing EFI firmware, often because
qemu is trying to traverse broken symbolic links to find that firmware.
Which is a bit silly given that the default torture-test guest OS has
but a single binary for its userspace, and thus is unlikely to do much
in the way of networking in any case.

This commit therefore avoids such problems by specifying "-net none"
to qemu unless the TORTURE_QEMU_INTERACTIVE environment variable is set
(for example, by having specified "--interactive" to kvm.sh), in which
case "-net nic -net user" is specified to qemu instead.  Either choice
may be overridden by specifying the "-net" argument of your choice to
the kvm.sh "--qemu-args" parameter.

Link: https://lore.kernel.org/lkml/20190701141403.GA246562@google.com
Reported-by: Joel Fernandes <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Paul E. McKenney 2020-04-28 14:41:48 -07:00
parent 9ebcfadb06
commit 88513ae533
2 changed files with 19 additions and 3 deletions
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21
tools/testing/selftests/rcutorture/bin/functions.sh
View File

@ -215,9 +215,6 @@ identify_qemu_args () {
then
echo -device spapr-vlan,netdev=net0,mac=$TORTURE_QEMU_MAC
echo -netdev bridge,br=br0,id=net0
elif test -n "$TORTURE_QEMU_INTERACTIVE"
then
echo -net nic -net user
fi
;;
esac
@ -275,3 +272,21 @@ specify_qemu_cpus () {
esac
fi
}
# specify_qemu_net qemu-args
#
# Appends a string containing "-net none" to qemu-args, unless the incoming
# qemu-args already contains "-smp" or unless the TORTURE_QEMU_INTERACTIVE
# environment variable is set, in which case the string that is be added is
# instead "-net nic -net user".
specify_qemu_net () {
if echo $1 | grep -q -e -net
then
echo $1
elif test -n "$TORTURE_QEMU_INTERACTIVE"
then
echo $1 -net nic -net user
else
echo $1 -net none
fi
}

1
tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
View File

@ -141,6 +141,7 @@ then
cpu_count=$TORTURE_ALLOTED_CPUS
fi
qemu_args="`specify_qemu_cpus "$QEMU" "$qemu_args" "$cpu_count"`"
qemu_args="`specify_qemu_net "$qemu_args"`"
# Generate architecture-specific and interaction-specific qemu arguments
qemu_args="$qemu_args `identify_qemu_args "$QEMU" "$resdir/console.log"`"