Hi,
On 10/2/19 3:43 PM, Juergen Gross wrote:
vcpu_wake() and vcpu_sleep() need to be made core scheduling aware:
they might need to switch a single vcpu of an already scheduled unit
between running and not running.
Especially when vcpu_sleep() for a vcpu is being called by a vcpu of
the same scheduling unit special care must be taken in order to avoid
a deadlock: the vcpu to be put asleep must be forced through a
context switch without doing so for the calling vcpu. For this
purpose add a vcpu flag handled in sched_slave() and in
sched_wait_rendezvous_in() allowing a vcpu of the currently running
unit to switch state at a higher priority than a normal schedule
event.
Use the same mechanism when waking up a vcpu of a currently active
unit.
While at it make vcpu_sleep_nosync_locked() static as it is used in
schedule.c only.
Signed-off-by: Juergen Gross <[email protected]>
Reviewed-by: Dario Faggioli <[email protected]>
Acked-by: Julien Grall <[email protected]>
Dario, can you confirm you are happy with the slight changes to cater Arm?
Cheers,
--
Julien Grall
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