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

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Hi Drew,

On 6/20/23 19:06, Andrew Jones wrote:
On Tue, Jun 20, 2023 at 02:13:22PM +1000, Gavin Shan wrote:
On 6/19/23 18:45, Andrew Jones wrote:
On Thu, Jun 15, 2023 at 04:21:48PM +1000, Gavin Shan wrote:
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-size=65536". 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-size=65536 ./its-migration
    timeout -k 1s --foreground 90s /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \
    -nodefaults -machine virt -accel kvm,dirty-ring-size=65536 -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

Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
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 "$KUT_STANDALONE" ]; then
-accel=$(get_qemu_accelerator) ||
-	exit $?
-if [ "$accel" = "kvm" ]; then
+get_qemu_accelerator || exit $?
+if [ "$ACCEL" = "kvm" ]; then
@@ -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"

As I pointed out in the v2 review we can't just s/accel/ACCEL/ without
other changes. Now ACCEL will also be set when the above condition
is checked, making it useless. Please ensure the test case that commit
c7d6c7f00e7c ("arm/run: Use TCG with qemu-system-arm on arm64 systems")
fixed still works with your patch.

Sorry that I missed your comments for v2. In order to make the test case
in c7d6c7f00e7c working, we just need to call set_qemu_accelerator() after
the chunk of code, like below. When $ACCEL is set to "tcg" by the conditional
code, it won't be changed in the following set_qemu_accelerator().

Could you Please confirm if it looks good to you so that I can integrate
the changes to v4 and post it.



if [ "$QEMU" ] && [ -z "$ACCEL" ] &&
    [ "$HOST" = "aarch64" ] && [ "$ARCH" = "arm" ] &&
    [ "$(basename $QEMU)" = "qemu-system-arm" ]; then

set_qemu_accelerator || exit $?
if [ "$ACCEL" = "kvm" ]; then

Looks fine, but please give it a test run.

Thanks, Drew. v4 has been posted for further review. Since I don't have a 'arm'
host around, I adjust $ARCH to "arm64" for a simulation and the test case included
in commit c7d6c7f00e7c should be working fine: We eventually have "tcg" instead of
"kvm" accelerator for the combination, which is expected by commit c7d6c7f00e7c



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