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Re: [PATCH v3] replay: notify CPU on event

From: Paolo Bonzini
Subject: Re: [PATCH v3] replay: notify CPU on event
Date: Thu, 1 Apr 2021 10:49:50 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0

On 01/04/21 10:19, Pavel Dovgalyuk wrote:
This patch enables vCPU notification to wake it up
when new async event comes in replay mode.

The motivation of this patch is the following.
Consider recorded block async event. It is saved into the log
with one of the checkpoints. This checkpoint may be passed in
vCPU loop. In replay mode when this async event is read from
the log, and block thread task is not finished yet, vCPU thread
goes to sleep. That is why this patch adds waking up the vCPU
to process this finished event.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
  replay/replay-events.c |    2 ++
  1 file changed, 2 insertions(+)

diff --git a/replay/replay-events.c b/replay/replay-events.c
index a1c6bb934e..15983dd250 100644
--- a/replay/replay-events.c
+++ b/replay/replay-events.c
@@ -15,6 +15,7 @@
  #include "replay-internal.h"
  #include "block/aio.h"
  #include "ui/input.h"
+#include "hw/core/cpu.h"
typedef struct Event {
      ReplayAsyncEventKind event_kind;
@@ -126,6 +127,7 @@ void replay_add_event(ReplayAsyncEventKind event_kind,
      QTAILQ_INSERT_TAIL(&events_list, event, events);
+    qemu_cpu_kick(first_cpu);
void replay_bh_schedule_event(QEMUBH *bh)

Queued, thanks.


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