[Qemu-devel] [PATCH v17 2/6] kvm-all.c: add qemu_irq/gsi hash table and utility routines

[Eric Auger]

VFIO platform device needs to setup irqfd but it does not know the
gsi corresponding to the device qemu_irq. This patch proposes to
store a hash table in kvm_state using the qemu_irq as key and the gsi
as a value.

kvm_irqchip_set_qemuirq_gsi allows to insert such a pair. The interrupt
controller is supposed to use it.

kvm_irqchip_[add, remove]_irqfd_notifier allows to setup/tear down
irqfd directly from the qemu_irq.

Signed-off-by: Eric Auger <address@hidden>
Tested-by: Vikram Sethi <address@hidden>
Acked-by: Paolo Bonzini <address@hidden>

---

v16 -> v17
- replace GPOINTER_TO_UINT by GPOINTER_TO_INT
- add Paolo's ack

v15 -> v16:
- Added Vikram's T-b

v13 -> v14:
- correct checkpatch warning

v2 -> v3 (integration into VFIO series v13):
- rename kvm_irqchip_[add, remove]_qemuirq_irqfd_notifier into
  kvm_irqchip_[add, remove]_irqfd_notifier. Possible since legacy
  functions were also renamed with _gsi suffix.

V1 -> v2:
- qemu_irq get_gsi callback replaced by hash table stored in kvm
---
 include/sysemu/kvm.h |  6 ++++++
 kvm-all.c            | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index acb3025..ba612fc 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -19,6 +19,7 @@
 #include "qemu/queue.h"
 #include "qom/cpu.h"
 #include "exec/memattrs.h"
+#include "hw/irq.h"
 
 #ifdef CONFIG_KVM
 #include <linux/kvm.h>
@@ -420,6 +421,11 @@ int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, 
EventNotifier *n,
                                        EventNotifier *rn, int virq);
 int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
                                           int virq);
+int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
+                                   EventNotifier *rn, qemu_irq irq);
+int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
+                                      qemu_irq irq);
+void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi);
 void kvm_pc_gsi_handler(void *opaque, int n, int level);
 void kvm_pc_setup_irq_routing(bool pci_enabled);
 void kvm_init_irq_routing(KVMState *s);
diff --git a/kvm-all.c b/kvm-all.c
index 730b818..cb76b38 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -37,6 +37,7 @@
 #include "exec/address-spaces.h"
 #include "qemu/event_notifier.h"
 #include "trace.h"
+#include "hw/irq.h"
 
 #include "hw/boards.h"
 
@@ -98,6 +99,7 @@ struct KVMState
      * unsigned, and treating them as signed here can break things */
     unsigned irq_set_ioctl;
     unsigned int sigmask_len;
+    GHashTable *gsimap;
 #ifdef KVM_CAP_IRQ_ROUTING
     struct kvm_irq_routing *irq_routes;
     int nr_allocated_irq_routes;
@@ -1339,6 +1341,35 @@ int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, 
EventNotifier *n,
            false);
 }
 
+int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
+                                   EventNotifier *rn, qemu_irq irq)
+{
+    gpointer key, gsi;
+    gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
+
+    if (!found) {
+        return -ENXIO;
+    }
+    return kvm_irqchip_add_irqfd_notifier_gsi(s, n, rn, GPOINTER_TO_INT(gsi));
+}
+
+int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
+                                      qemu_irq irq)
+{
+    gpointer key, gsi;
+    gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
+
+    if (!found) {
+        return -ENXIO;
+    }
+    return kvm_irqchip_remove_irqfd_notifier_gsi(s, n, GPOINTER_TO_INT(gsi));
+}
+
+void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi)
+{
+    g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi));
+}
+
 static int kvm_irqchip_create(MachineState *machine, KVMState *s)
 {
     int ret;
@@ -1371,6 +1402,8 @@ static int kvm_irqchip_create(MachineState *machine, 
KVMState *s)
 
     kvm_init_irq_routing(s);
 
+    s->gsimap = g_hash_table_new(g_direct_hash, g_direct_equal);
+
     return 0;
 }
 
-- 
1.8.3.2