Yifan Liu 745e70fb06 hv: Change sched_event back to boolean-based implementation ... Commit d575edf79a changes the internal implementation of wait_event and signal_event to use a counter instead of a boolean value. The background was: ACRN utilizes vcpu_make_request and signal_event pair to shoot down other vcpus and let them wait for signals. vcpu_make_request eventually leads to target vcpu calling wait_event. However vcpu_make_request/signal_event pair was not thread-safe, and concurrent calls of this pair of API could lead to problems. One such example is the concurrent wbinvd emulation, where vcpus may concurrently issue vcpu_make_request/signal_event to synchronize wbinvd emulation. d575edf commit uses a counter in internal implementation of wait_event/signal_event to avoid data races. However by using a counter, the wait/signal pair now carries semantics of semaphores instead of events. Semaphores require caller to carefully plan their calls instead of multiply signaling any number of times to the same event, which deviates from the original "event" semantics. This patch changes the API implementation back to boolean-based, and re-resolve the issue of concurrent wbinvd in next patch. This also partially reverts commit 10963b04d1, which was introduced because of the d575edf. Tracked-On: #7887 Signed-off-by: Yifan Liu <yifan1.liu@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>		2022-07-14 09:05:37 +08:00
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arch/x86/asm	hv: Change sched_event back to boolean-based implementation	2022-07-14 09:05:37 +08:00
common	hv: Change sched_event back to boolean-based implementation	2022-07-14 09:05:37 +08:00
debug	Remove "All rights reserved" string headers	2022-04-06 13:21:02 +08:00
dm	hv: vRTC monotonic growth	2022-05-12 13:20:21 +08:00
hw	Remove "All rights reserved" string headers	2022-04-06 13:21:02 +08:00
lib	hv: move the define of MAX_IR_ENTRIES to offline tool	2022-05-20 09:08:47 +08:00
public	Remove "All rights reserved" string headers	2022-04-06 13:21:02 +08:00