For device assignment, we need to know when the VM writes an end
of interrupt to the APIC, which allows us to re-enable interrupts
on the physical device. Add a new wrapper for ioapic generated
interrupts with a callback on eoi and create an interface for
drivers to be notified on eoi.
Signed-off-by: Alex Williamson <alex.william...@redhat.com>
---
Note that the notifier and notifier_enabled eoi_client fields aren't
used here yet. I'll send an RFC patch showing how we make use of
these with the proposed KVM_EOI_EVENTFD patches.
hw/apic.c | 18 ++++++++++++++++--
hw/apic.h | 4 ++++
hw/ioapic.c | 38 ++++++++++++++++++++++++++++++++++++--
hw/pc.h | 16 +++++++++++++++-
4 files changed, 71 insertions(+), 5 deletions(-)
diff --git a/hw/apic.c b/hw/apic.c
index 63d62c7..a24117b 100644
--- a/hw/apic.c
+++ b/hw/apic.c
@@ -22,6 +22,7 @@
#include "host-utils.h"
#include "sysbus.h"
#include "trace.h"
+#include "pc.h"
/* APIC Local Vector Table */
#define APIC_LVT_TIMER 0
@@ -103,6 +104,7 @@ struct APICState {
int wait_for_sipi;
};
+static uint8_t vector_to_gsi_map[256] = { 0xff };
static APICState *local_apics[MAX_APICS + 1];
static int apic_irq_delivered;
@@ -292,6 +294,15 @@ void apic_deliver_irq(uint8_t dest, uint8_t dest_mode,
trigger_mode);
}
+void apic_deliver_ioapic_irq(uint8_t dest, uint8_t dest_mode,
+ uint8_t delivery_mode, uint8_t vector_num,
+ uint8_t polarity, uint8_t trigger_mode, int gsi)
+{
+ vector_to_gsi_map[vector_num] = gsi;
+ apic_deliver_irq(dest, dest_mode, delivery_mode,
+ vector_num, polarity, trigger_mode);
+}
+
void cpu_set_apic_base(DeviceState *d, uint64_t val)
{
APICState *s = DO_UPCAST(APICState, busdev.qdev, d);
@@ -420,8 +431,11 @@ static void apic_eoi(APICState *s)
if (isrv < 0)
return;
reset_bit(s->isr, isrv);
- /* XXX: send the EOI packet to the APIC bus to allow the I/O APIC to
- set the remote IRR bit for level triggered interrupts. */
+
+ if (vector_to_gsi_map[isrv] != 0xff) {
+ ioapic_eoi(vector_to_gsi_map[isrv]);
+ vector_to_gsi_map[isrv] = 0xff;
+ }
apic_update_irq(s);
}
diff --git a/hw/apic.h b/hw/apic.h
index 8a0c9d0..59d0e37 100644
--- a/hw/apic.h
+++ b/hw/apic.h
@@ -8,6 +8,10 @@ void apic_deliver_irq(uint8_t dest, uint8_t dest_mode,
uint8_t delivery_mode,
uint8_t vector_num, uint8_t polarity,
uint8_t trigger_mode);
+void apic_deliver_ioapic_irq(uint8_t dest, uint8_t dest_mode,
+ uint8_t delivery_mode,
+ uint8_t vector_num, uint8_t polarity,
+ uint8_t trigger_mode, int gsi);
int apic_accept_pic_intr(DeviceState *s);
void apic_deliver_pic_intr(DeviceState *s, int level);
int apic_get_interrupt(DeviceState *s);
diff --git a/hw/ioapic.c b/hw/ioapic.c
index 5ae21e9..ffd1c92 100644
--- a/hw/ioapic.c
+++ b/hw/ioapic.c
@@ -26,6 +26,7 @@
#include "qemu-timer.h"
#include "host-utils.h"
#include "sysbus.h"
+#include "qlist.h"
//#define DEBUG_IOAPIC
@@ -61,6 +62,39 @@ struct IOAPICState {
uint64_t ioredtbl[IOAPIC_NUM_PINS];
};
+static QLIST_HEAD(ioapic_eoi_client_list,
+ ioapic_eoi_client) ioapic_eoi_client_list =
+ QLIST_HEAD_INITIALIZER(ioapic_eoi_client_list);
+
+int ioapic_register_eoi_client(ioapic_eoi_client *client)
+{
+ QLIST_INSERT_HEAD(&ioapic_eoi_client_list, client, list);
+ return 0;
+}
+
+void ioapic_unregister_eoi_client(ioapic_eoi_client *client)
+{
+ QLIST_REMOVE(client, list);
+}
+
+int ioapic_eoi_client_get_fd(ioapic_eoi_client *client)
+{
+ if (!client->notifier_enabled) {
+ return -ENODEV;
+ }
+ return event_notifier_get_fd(&client->notifier);
+}
+
+void ioapic_eoi(int gsi)
+{
+ ioapic_eoi_client *client;
+ QLIST_FOREACH(client, &ioapic_eoi_client_list, list) {
+ if (client->irq == gsi) {
+ client->eoi(client);
+ }
+ }
+}
+
static void ioapic_service(IOAPICState *s)
{
uint8_t i;
@@ -90,8 +124,8 @@ static void ioapic_service(IOAPICState *s)
else
vector = entry & 0xff;
- apic_deliver_irq(dest, dest_mode, delivery_mode,
- vector, polarity, trig_mode);
+ apic_deliver_ioapic_irq(dest, dest_mode, delivery_mode,
+ vector, polarity, trig_mode, i);
}
}
}
diff --git a/hw/pc.h b/hw/pc.h
index 63b0249..5945bff 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -5,6 +5,7 @@
#include "ioport.h"
#include "isa.h"
#include "fdc.h"
+#include "event_notifier.h"
/* PC-style peripherals (also used by other machines). */
@@ -48,8 +49,21 @@ typedef struct isa_irq_state {
void isa_irq_handler(void *opaque, int n, int level);
-/* i8254.c */
+struct ioapic_eoi_client;
+typedef struct ioapic_eoi_client ioapic_eoi_client;
+struct ioapic_eoi_client {
+ void (*eoi)(struct ioapic_eoi_client *client);
+ int irq;
+ EventNotifier notifier;
+ QLIST_ENTRY(ioapic_eoi_client) list;
+ bool notifier_enabled;
+};
+int ioapic_register_eoi_client(ioapic_eoi_client *client);
+void ioapic_unregister_eoi_client(ioapic_eoi_client *client);
+int ioapic_eoi_client_get_fd(ioapic_eoi_client *client);
+void ioapic_eoi(int gsi);
+/* i8254.c */
#define PIT_FREQ 1193182
typedef struct PITState PITState;
