diff mbox series

[PULL,24/37] replay: don't record interrupt poll

Message ID 20201006072947.487729-25-pbonzini@redhat.com
State New
Headers show
Series Build system + accel + record/replay patches for 2020-10-06 | expand

Commit Message

Paolo Bonzini Oct. 6, 2020, 7:29 a.m. UTC 
From: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>

Interrupt poll is not a real interrupt event. It is needed only for
thread safety. This interrupt is used for i386 and converted
to hardware interrupt by cpu_handle_interrupt function.
Therefore it is not needed to be recorded, because hardware
interrupt will be recorded after converting.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

--

v4 changes:
 - Condition check refactoring (suggested by Alex Bennée)
Message-Id: <160174517124.12451.12983410242461131737.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 accel/tcg/cpu-exec.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 0dbe67acf5..58aea605d8 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -436,8 +436,7 @@  static inline bool cpu_handle_halt(CPUState *cpu)
 {
     if (cpu->halted) {
 #if defined(TARGET_I386) && !defined(CONFIG_USER_ONLY)
-        if ((cpu->interrupt_request & CPU_INTERRUPT_POLL)
-            && replay_interrupt()) {
+        if (cpu->interrupt_request & CPU_INTERRUPT_POLL) {
             X86CPU *x86_cpu = X86_CPU(cpu);
             qemu_mutex_lock_iothread();
             apic_poll_irq(x86_cpu->apic_state);
@@ -533,6 +532,20 @@  static inline bool cpu_handle_exception(CPUState *cpu, int *ret)
     return false;
 }
 
+/*
+ * CPU_INTERRUPT_POLL is a virtual event which gets converted into a
+ * "real" interrupt event later. It does not need to be recorded for
+ * replay purposes.
+ */
+static inline bool need_replay_interrupt(int interrupt_request)
+{
+#if defined(TARGET_I386)
+    return !(interrupt_request & CPU_INTERRUPT_POLL);
+#else
+    return true;
+#endif
+}
+
 static inline bool cpu_handle_interrupt(CPUState *cpu,
                                         TranslationBlock **last_tb)
 {
@@ -594,7 +607,9 @@  static inline bool cpu_handle_interrupt(CPUState *cpu,
            and via longjmp via cpu_loop_exit.  */
         else {
             if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
-                replay_interrupt();
+                if (need_replay_interrupt(interrupt_request)) {
+                    replay_interrupt();
+                }
                 /*
                  * After processing the interrupt, ensure an EXCP_DEBUG is
                  * raised when single-stepping so that GDB doesn't miss the