[Xen-devel] [PATCH 1 of 2] Allow ACPI state change with active cpupools

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

Changing the ACPI state (e.g. power off) while not all cpus are in cpupool 0
will currently crash the hypervisor during disabling the other cpus.
Up to now only cpus in Pool-0 were allowed to go offline. There is no reason
why a cpu in another cpupool can't be taken offline if there are still other
cpus available in that cpupool.
As disabling the cpus for an ACPI state change is only a temporary measure
(if not poweroff, of course) and all domains are paused in this case, there
is no reason to reject removing the last cpu from a cpupool if only paused
domains are in this cpupool.
The cpus taken offline from a cpupool will be still associated with that
cpupool to enable adding them automatically when they are becoming online
again.

Signed-off-by: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>


4 files changed, 80 insertions(+), 9 deletions(-)
xen/arch/x86/smpboot.c     |    2 -
xen/common/cpupool.c       |   85 +++++++++++++++++++++++++++++++++++++++-----
xen/include/xen/sched-if.h |    1 
xen/include/xen/sched.h    |    1

Attachment: xen-staging.hg-2.patch
Description: Text Data

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