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

[Thomas Huth]

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...

 Thomas