[kvm-unit-tests PATCH v3] runtime: Allow to specify properties for accelerator

[Gavin Shan <gshan@redhat.com>]

There are extra properties for accelerators to enable the specific
features. For example, the dirty ring for KVM accelerator can be
enabled by "-accel kvm,dirty-ring-sizee536". Unfortuntely, the
extra properties for the accelerators aren't supported. It makes
it's impossible to test the combination of KVM and dirty ring
as the following error message indicates.

  # cd /home/gavin/sandbox/kvm-unit-tests/tests
  # QEMU=/home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \
    ACCEL=kvm,dirty-ring-sizee536 ./its-migration
     :
  BUILD_HEAD/ffb37e
  timeout -k 1s --foreground 90s /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \
  -nodefaults -machine virt -accel kvm,dirty-ring-sizee536 -cpu cortex-a57             \
  -device virtio-serial-device -device virtconsole,chardev=ctd -chardev testdev,id=ctd   \
  -device pci-testdev -display none -serial stdio -kernel _NO_FILE_4Uhere_ -smp 160      \
  -machine gic-version=3 -append its-pending-migration # -initrd /tmp/tmp.gfDLa1EtWk
  qemu-system-aarch64: kvm_init_vcpu: kvm_arch_init_vcpu failed (0): Invalid argument

Allow to specify extra properties for accelerators. With this, the
"its-migration" can be tested for the combination of KVM and dirty
ring.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
v3: Split $ACCEL to $ACCEL and $ACCEL_PROPS in get_qemu_accelerator()
    and don't print them as output, suggested by Drew.
---
 arm/run               | 12 ++++--------
 powerpc/run           |  5 ++---
 s390x/run             |  5 ++---
 scripts/arch-run.bash | 21 +++++++++++++--------
 x86/run               |  5 ++---
 5 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/arm/run b/arm/run
index c6f25b8..d9ebe59 100755
--- a/arm/run
+++ b/arm/run
@@ -10,10 +10,8 @@ if [ -z "$KUT_STANDALONE" ]; then
 fi
 processor="$PROCESSOR"
 
-accel=$(get_qemu_accelerator) ||
-	exit $?
-
-if [ "$accel" = "kvm" ]; then
+get_qemu_accelerator || exit $?
+if [ "$ACCEL" = "kvm" ]; then
 	QEMU_ARCH=$HOST
 fi
 
@@ -23,11 +21,9 @@ qemu=$(search_qemu_binary) ||
 if [ "$QEMU" ] && [ -z "$ACCEL" ] &&
    [ "$HOST" = "aarch64" ] && [ "$ARCH" = "arm" ] &&
    [ "$(basename $QEMU)" = "qemu-system-arm" ]; then
-	accel=tcg
+	ACCEL="tcg"
 fi
 
-ACCEL=$accel
-
 if ! $qemu -machine '?' | grep -q 'ARM Virtual Machine'; then
 	echo "$qemu doesn't support mach-virt ('-machine virt'). Exiting."
 	exit 2
@@ -72,7 +68,7 @@ if $qemu $M -device '?' | grep -q pci-testdev; then
 	pci_testdev="-device pci-testdev"
 fi
 
-A="-accel $ACCEL"
+A="-accel $ACCEL$ACCEL_PROPS"
 command="$qemu -nodefaults $M $A -cpu $processor $chr_testdev $pci_testdev"
 command+=" -display none -serial stdio -kernel"
 command="$(migration_cmd) $(timeout_cmd) $command"
diff --git a/powerpc/run b/powerpc/run
index ee38e07..3988e72 100755
--- a/powerpc/run
+++ b/powerpc/run
@@ -9,8 +9,7 @@ if [ -z "$KUT_STANDALONE" ]; then
 	source scripts/arch-run.bash
 fi
 
-ACCEL=$(get_qemu_accelerator) ||
-	exit $?
+get_qemu_accelerator || exit $?
 
 qemu=$(search_qemu_binary) ||
 	exit $?
@@ -21,7 +20,7 @@ if ! $qemu -machine '?' 2>&1 | grep 'pseries' > /dev/null; then
 fi
 
 M='-machine pseries'
-M+=",accel=$ACCEL"
+M+=",accel=$ACCEL$ACCEL_PROPS"
 command="$qemu -nodefaults $M -bios $FIRMWARE"
 command+=" -display none -serial stdio -kernel"
 command="$(migration_cmd) $(timeout_cmd) $command"
diff --git a/s390x/run b/s390x/run
index f1111db..c57862f 100755
--- a/s390x/run
+++ b/s390x/run
@@ -9,8 +9,7 @@ if [ -z "$KUT_STANDALONE" ]; then
 	source scripts/arch-run.bash
 fi
 
-ACCEL=$(get_qemu_accelerator) ||
-	exit $?
+get_qemu_accelerator || exit $?
 
 qemu=$(search_qemu_binary) ||
 	exit $?
@@ -26,7 +25,7 @@ if [ "${1: -7}" = ".pv.bin" ] || [ "${TESTNAME: -3}" = "_PV" ] && [ "$MIGRATION"
 fi
 
 M='-machine s390-ccw-virtio'
-M+=",accel=$ACCEL"
+M+=",accel=$ACCEL$ACCEL_PROPS"
 command="$qemu -nodefaults -nographic $M"
 command+=" -chardev stdio,id=con0 -device sclpconsole,chardev=con0"
 command+=" -kernel"
diff --git a/scripts/arch-run.bash b/scripts/arch-run.bash
index 51e4b97..19c16c1 100644
--- a/scripts/arch-run.bash
+++ b/scripts/arch-run.bash
@@ -412,6 +412,9 @@ hvf_available ()
 
 get_qemu_accelerator ()
 {
+	ACCEL_PROPS=${ACCEL#"${ACCEL%%,*}"}
+	ACCEL=${ACCEL%%,*}
+
 	if [ "$ACCEL" = "kvm" ] && ! kvm_available; then
 		echo "KVM is needed, but not available on this host" >&2
 		return 2
@@ -421,13 +424,15 @@ get_qemu_accelerator ()
 		return 2
 	fi
 
-	if [ "$ACCEL" ]; then
-		echo $ACCEL
-	elif kvm_available; then
-		echo kvm
-	elif hvf_available; then
-		echo hvf
-	else
-		echo tcg
+	if [ -z "$ACCEL" ]; then
+		if kvm_available; then
+			ACCEL="kvm"
+		elif hvf_available; then
+			ACCEL="hvf"
+		else
+			ACCEL="tcg"
+		fi
 	fi
+
+	return 0
 }
diff --git a/x86/run b/x86/run
index 4d53b72..9a10703 100755
--- a/x86/run
+++ b/x86/run
@@ -9,8 +9,7 @@ if [ -z "$KUT_STANDALONE" ]; then
 	source scripts/arch-run.bash
 fi
 
-ACCEL=$(get_qemu_accelerator) ||
-	exit $?
+get_qemu_accelerator || exit $?
 
 qemu=$(search_qemu_binary) ||
 	exit $?
@@ -38,7 +37,7 @@ else
 fi
 
 command="${qemu} --no-reboot -nodefaults $pc_testdev -vnc none -serial stdio $pci_testdev"
-command+=" -machine accel=$ACCEL"
+command+=" -machine accel=$ACCEL$ACCEL_PROPS"
 if [ "${CONFIG_EFI}" != y ]; then
 	command+=" -kernel"
 fi
-- 
2.40.1