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
