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[Qemu-devel] [PULL 49/52] i386: interrupt poll processing


From: Paolo Bonzini
Subject: [Qemu-devel] [PULL 49/52] i386: interrupt poll processing
Date: Fri, 25 Sep 2015 18:51:37 +0200

From: Pavel Dovgalyuk <address@hidden>

This patch updates x86_cpu_exec_interrupt function.
It can process two interrupt request at a time (poll and another one).
This makes its execution non-deterministic. Determinism is requred
for recorded icount execution.

Signed-off-by: Pavel Dovgalyuk <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
 target-i386/seg_helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target-i386/seg_helper.c b/target-i386/seg_helper.c
index 1a3a2e7..1cbe559 100644
--- a/target-i386/seg_helper.c
+++ b/target-i386/seg_helper.c
@@ -1321,6 +1321,9 @@ bool x86_cpu_exec_interrupt(CPUState *cs, int 
interrupt_request)
     if (interrupt_request & CPU_INTERRUPT_POLL) {
         cs->interrupt_request &= ~CPU_INTERRUPT_POLL;
         apic_poll_irq(cpu->apic_state);
+        /* Don't process multiple interrupt requests in a single call.
+           This is required to make icount-driven execution deterministic. */
+        return true;
     }
 #endif
     if (interrupt_request & CPU_INTERRUPT_SIPI) {
-- 
2.5.0





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