virgl/ci: Run each dEQP instance in its own VM

Currently we run deqp-runner inside a single VM, which makes very poor
use of the available CPUs because Virgl has a bottleneck in the VMM that
serializes everything.

With this change, we can run several Crosvm instances in a runner and
make full use of the CPUs. Getting the same coverage with 3 runners
instead of 6.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Corentin Noël <corentin.noel@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12828>

.gitlab-ci/crosvm-init.sh

@@ -1,27 +1,29 @@
 #!/bin/sh
 
-set -ex
+set -e
+
+export DEQP_TEMP_DIR=$1
 
 mount -t proc none /proc
 mount -t sysfs none /sys
-mount -t devtmpfs none /dev || echo possibly already mounted
 mkdir -p /dev/pts
 mount -t devpts devpts /dev/pts
 mount -t tmpfs tmpfs /tmp
 
-. /crosvm-env.sh
+. $DEQP_TEMP_DIR/crosvm-env.sh
 
-# / is ro
-export PIGLIT_REPLAY_EXTRA_ARGS="$PIGLIT_REPLAY_EXTRA_ARGS --db-path /tmp/replayer-db"
+cd $PWD
 
-if sh $CROSVM_TEST_SCRIPT; then
-    touch /results/success
-fi
+dmesg --level crit,err,warn -w >> $DEQP_TEMP_DIR/stderr &
 
-sleep 5   # Leave some time to get the last output flushed out
+set +e
+stdbuf -oL sh $DEQP_TEMP_DIR/crosvm-script.sh 2>> $DEQP_TEMP_DIR/stderr >> $DEQP_TEMP_DIR/stdout
+echo $? > $DEQP_TEMP_DIR/exit_code
+set -e
+
+sync
+sleep 1
 
 poweroff -d -n -f || true
 
-sleep 10   # Just in case init would exit before the kernel shuts down the VM
-
-exit 1
+sleep 1   # Just in case init would exit before the kernel shuts down the VM