xen/events: reset affinity of 2-level event when tearing it down

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commit 9e77d96b8e upstream.

When creating a new event channel with 2-level events the affinity
needs to be reset initially in order to avoid using an old affinity
from earlier usage of the event channel port. So when tearing an event
channel down reset all affinity bits.

The same applies to the affinity when onlining a vcpu: all old
affinity settings for this vcpu must be reset. As percpu events get
initialized before the percpu event channel hook is called,
resetting of the affinities happens after offlining a vcpu (this is
working, as initial percpu memory is zeroed out).

Cc: stable@vger.kernel.org
Reported-by: Julien Grall <julien@xen.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
Link: https://lore.kernel.org/r/20210306161833.4552-2-jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Juergen Gross 2021-03-06 17:18:31 +01:00 • committed by Greg Kroah-Hartman

parent e86abde80d

commit bb815894ba

3 changed files with 24 additions and 0 deletions

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15

drivers/xen/events/events_2l.c

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1

drivers/xen/events/events_base.c

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8

drivers/xen/events/events_internal.h

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