Re: [kvm-unit-tests PATCH v4 8/8] migration: add a migration selftest

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On 17/02/2024 08.19, Nicholas Piggin wrote:
On Fri Feb 16, 2024 at 9:15 PM AEST, Thomas Huth wrote:
On 09/02/2024 10.11, Nicholas Piggin wrote:
Add a selftest for migration support in  guest library and test harness
code. It performs migrations in a tight loop to irritate races and bugs
in the test harness code.

Include the test in arm, s390, powerpc.

Acked-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx> (s390x)
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
   arm/Makefile.common          |  1 +
   arm/selftest-migration.c     |  1 +
   arm/unittests.cfg            |  6 ++++++

   Hi Nicholas,

I just gave the patches a try, but the arm test seems to fail for me: Only
the first getchar() seems to wait for a character, all the subsequent ones
don't wait anymore and just continue immediately ... is this working for
you? Or do I need another patch on top?

Hey sorry missed this comment....

It does seem to work for me, I've mostly tested pseries but I did test
others too (that's how I saw the arm getchar limit).

How are you observing it not waiting for migration?

According to you other mail, I think you figured it out already, but just for the records: You can see it when running the guest manually, e.g. something like:

 qemu-system-aarch64 -nodefaults -machine virt -accel tcg -cpu cortex-a57 \
   -device virtio-serial-device -device virtconsole,chardev=ctd \
   -chardev testdev,id=ctd -device pci-testdev -display none \
   -serial mon:stdio -kernel arm/selftest-migration.flat -smp 1

Without my "lib/arm/io: Fix calling getchar() multiple times" patch, the guest only waits during the first getchar(), all the others simply return immediately.

 Thomas





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