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Re: [Qemu-devel] [PATCH v2 3/6] tests/device-plug: Add a simple PCI unpl

From: Thomas Huth
Subject: Re: [Qemu-devel] [PATCH v2 3/6] tests/device-plug: Add a simple PCI unplug request test
Date: Fri, 15 Feb 2019 16:21:57 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0

On 15/02/2019 14.30, David Hildenbrand wrote:
> The issue with testing asynchronous unplug requests it that they usually
> require a running guest to handle the request. However, to test if
> unplug of PCI devices works, we can apply a nice little trick on some
> architectures:
> On system reset, x86 ACPI, s390x and spapr will perform the unplug,
> resulting in the device of interest to get deleted and a DEVICE_DELETED
> event getting sent.
> On s390x, we still get a warning
>     qemu-system-s390x: -device virtio-mouse-pci,id=dev0:
>     warning: Plugging a PCI/zPCI device without the 'zpci' CPU feature
>     enabled; the guest will not be able to see/use this device
> This will be fixed soon, when we enable the zpci CPU feature always
> (Conny already has a patch for this queued).
> Signed-off-by: David Hildenbrand <address@hidden>
> ---
>  tests/Makefile.include   |  4 ++
>  tests/device-plug-test.c | 93 ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 97 insertions(+)
>  create mode 100644 tests/device-plug-test.c

Reviewed-by: Thomas Huth <address@hidden>

BTW, have you spotted the qpci_unplug_acpi_device_test() in libqos
already? Might be interesting for these kinds of tests, too - we use it
in a couple of other tests already, though, so I'm not sure if we need
additional tests with that...

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