xen/events: don't unmask an event channel when an eoi is pending

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An event channel should be kept masked when an eoi is pending for it.
When being migrated to another cpu it might be unmasked, though.

In order to avoid this keep three different flags for each event channel
to be able to distinguish "normal" masking/unmasking from eoi related
masking/unmasking and temporary masking. The event channel should only
be able to generate an interrupt if all flags are cleared.

Cc: stable@vger.kernel.org
Fixes: 54c9de8989 ("xen/events: add a new "late EOI" evtchn framework")
Reported-by: Julien Grall <julien@xen.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Tested-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Link: https://lore.kernel.org/r/20210306161833.4552-3-jgross@suse.com

[boris -- corrected Fixed tag format]

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

...

This commit is contained in:

Juergen Gross 2021-03-06 17:18:32 +01:00 • committed by Boris Ostrovsky

parent 9e77d96b8e

commit 25da4618af

4 changed files with 80 additions and 41 deletions

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7

drivers/xen/events/events_2l.c

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101

drivers/xen/events/events_base.c

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7

drivers/xen/events/events_fifo.c

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6

drivers/xen/events/events_internal.h

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