[Qemu-devel] [PATCH v3 1/5] hpet 'driftfix': add hooks required to detect coalesced interrupts (x86 apic only)

[Ulrich Obergfell <uobergfe@redhat.com>]

'target_get_irq_delivered' and 'target_reset_irq_delivered' contain
entry addresses of functions that are utilized by update_irq() to
detect coalesced interrupts. apic code loads these pointers during
initialization.

This change can be replaced if a generic feedback infrastructure to
track coalesced IRQs for periodic, clock providing devices becomes
available.

Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
---
 hw/apic.c |    4 ++++
 sysemu.h  |    3 +++
 vl.c      |    3 +++
 3 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/hw/apic.c b/hw/apic.c
index a45b57f..eb0f6d9 100644
--- a/hw/apic.c
+++ b/hw/apic.c
@@ -24,6 +24,7 @@
 #include "sysbus.h"
 #include "trace.h"
 #include "kvm.h"
+#include "sysemu.h"
 
 /* APIC Local Vector Table */
 #define APIC_LVT_TIMER   0
@@ -1143,6 +1144,9 @@ static SysBusDeviceInfo apic_info = {
 
 static void apic_register_devices(void)
 {
+    target_get_irq_delivered = apic_get_irq_delivered;
+    target_reset_irq_delivered = apic_reset_irq_delivered;
+
     sysbus_register_withprop(&apic_info);
 }
 
diff --git a/sysemu.h b/sysemu.h
index 07d85cd..75b0139 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -98,6 +98,9 @@ int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f);
 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f);
 int qemu_loadvm_state(QEMUFile *f);
 
+extern int (*target_get_irq_delivered)(void);
+extern void (*target_reset_irq_delivered)(void);
+
 /* SLIRP */
 void do_info_slirp(Monitor *mon);
 
diff --git a/vl.c b/vl.c
index 0c24e07..7bab315 100644
--- a/vl.c
+++ b/vl.c
@@ -233,6 +233,9 @@ const char *prom_envs[MAX_PROM_ENVS];
 const char *nvram = NULL;
 int boot_menu;
 
+int (*target_get_irq_delivered)(void) = 0;
+void (*target_reset_irq_delivered)(void) = 0;
+
 typedef struct FWBootEntry FWBootEntry;
 
 struct FWBootEntry {
-- 
1.6.2.5