[Qemu-devel] [PATCH v7 18/25] ioapic: register IOMMU IEC notifier for ioapic

[Peter Xu <peterx@redhat.com>]

Let IOAPIC the first consumer of x86 IOMMU IEC invalidation
notifiers. This is only used for split irqchip case, when vIOMMU
receives IR invalidation requests, IOAPIC will be notified to update
kernel irq routes. For simplicity, we just update all IOAPIC routes,
even if the invalidated entries are not IOAPIC ones.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/intc/ioapic.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c
index dafefd0..e924100 100644
--- a/hw/intc/ioapic.c
+++ b/hw/intc/ioapic.c
@@ -30,6 +30,7 @@
 #include "sysemu/kvm.h"
 #include "target-i386/cpu.h"
 #include "hw/i386/apic-msidef.h"
+#include "hw/i386/x86-iommu.h"
 
 //#define DEBUG_IOAPIC
 
@@ -197,6 +198,14 @@ static void ioapic_update_kvm_routes(IOAPICCommonState *s)
 #endif
 }
 
+static void ioapic_iec_notifier(void *private, bool global,
+                                uint32_t index, uint32_t mask)
+{
+    IOAPICCommonState *s = (IOAPICCommonState *)private;
+    /* For simplicity, we just update all the routes */
+    ioapic_update_kvm_routes(s);
+}
+
 void ioapic_eoi_broadcast(int vector)
 {
     IOAPICCommonState *s;
@@ -363,6 +372,18 @@ static void ioapic_realize(DeviceState *dev, Error **errp)
     qdev_init_gpio_in(dev, ioapic_set_irq, IOAPIC_NUM_PINS);
 
     ioapics[ioapic_no] = s;
+
+#ifdef CONFIG_KVM
+    if (kvm_irqchip_is_split()) {
+        X86IOMMUState *iommu = x86_iommu_get_default();
+        if (iommu) {
+            /* Register this IOAPIC with IOMMU IEC notifier, so that
+             * when there are IR invalidates, we can be notified to
+             * update kernel IR cache. */
+            x86_iommu_iec_register_notifier(iommu, ioapic_iec_notifier, s);
+        }
+    }
+#endif
 }
 
 static void ioapic_class_init(ObjectClass *klass, void *data)
-- 
2.4.11