[kvm-unit-tests GIT PULL 02/26] s390x: run PV guests with confidential guest enabled

Nico Boehr
2023-11-10T13:54:23Z

PV can only handle one page of SCLP read info, hence it can only support
a maximum of 247 CPUs.

To make sure we respect these limitations under PV, add a confidential
guest device to QEMU when launching a PV guest.

This fixes the topology-2 test failing under PV.

Also refactor the run script a bit to reduce code duplication by moving
the check whether we're running a PV guest to a function.

Suggested-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20230925135259.1685540-1-nrb@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
s390x/run | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/s390x/run b/s390x/run
index dcbf3f0..e58fa4a 100755
--- a/s390x/run
+++ b/s390x/run
@@ -14,19 +14,34 @@ set_qemu_accelerator || exit $?
qemu=$(search_qemu_binary) ||
exit $?

-if [ "${1: -7}" = ".pv.bin" ] || [ "${TESTNAME: -3}" = "_PV" ] && [ "$ACCEL" = "tcg" ]; then
+is_pv() {
+ if [ "${1: -7}" = ".pv.bin" ] || [ "${TESTNAME: -3}" = "_PV" ]; then
+ return 0
+ fi
+ return 1
+}
+
+if is_pv && [ "$ACCEL" = "tcg" ]; then
echo "Protected Virtualization isn't supported under TCG"
exit 2
fi

-if [ "${1: -7}" = ".pv.bin" ] || [ "${TESTNAME: -3}" = "_PV" ] && [ "$MIGRATION" = "yes" ]; then
+if is_pv && [ "$MIGRATION" = "yes" ]; then
echo "Migration isn't supported under Protected Virtualization"
exit 2
fi

M='-machine s390-ccw-virtio'
M+=",accel=$ACCEL$ACCEL_PROPS"
+
+if is_pv; then
+ M+=",confidential-guest-support=pv0"
+fi
+
command="$qemu -nodefaults -nographic $M"
+if is_pv; then
+ command+=" -object s390-pv-guest,id=pv0"
+fi
command+=" -chardev stdio,id=con0 -device sclpconsole,chardev=con0"
command+=" -kernel"
command="$(panic_cmd) $(migration_cmd) $(timeout_cmd) $command"
--
2.41.0