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Re: [qemu-s390x] [Qemu-ppc] [PATCH 0/4] Improve the CPU hot plug tests

From: Thomas Huth
Subject: Re: [qemu-s390x] [Qemu-ppc] [PATCH 0/4] Improve the CPU hot plug tests
Date: Tue, 17 Oct 2017 18:36:08 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 17.10.2017 18:27, Daniel Henrique Barboza wrote:
> On 10/17/2017 11:32 AM, Thomas Huth wrote:
>> So far the CPU hot-plug qtest was only checking "cpu-add" on x86. With
>> these patches, we now test "device_add" for hot-plugging CPUs on x86,
>> and enable the test on ppc64 and s390x, too.
> Question: is there a reason other than "no one bothered" to not have a
> CPU hot
> unplug test, something around the lines of the now cpu-plug-test.c? I might
> give it a shot if there is no known roadblocks against it.

AFAIK on x86, you need some ACPI magic on the guest side to do this
(something similar to qpci_unplug_acpi_device_test() in
tests/libqos/pci-pc.c I guess). And on s390x, CPU unplug is not
supported at all. But it might work on ppc64 without guest intervention,
not sure - maybe Bharata can comment on this...


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