[Qemu-devel] [RFC v2 3/4] kvm: add kvm_vfio_get_device_irq

[Eric Auger <eric.auger@linaro.org>]

Since the introduction of the qemu_irq/gsi hash table in kvm,
the gsi information is stored in kvm. New functions are introduced
to allocate/populate a kvm_vfio_dev_irq struct pointer from a
qemu_irq object and free it.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
---
 include/sysemu/kvm.h |  5 +++++
 kvm-all.c            | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index bc3f230..42cc6c4 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -423,6 +423,11 @@ int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
 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);
+struct kvm_vfio_dev_irq;
+int kvm_vfio_get_device_irq(KVMState *s, int fd, int index,
+                            int start, int count, qemu_irq irq,
+                            struct kvm_vfio_dev_irq **vfio_dev_irq);
+void kvm_vfio_put_device_irq(struct kvm_vfio_dev_irq *vfio_dev_irq);
 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 d2cb7ed..83a9689 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1454,6 +1454,38 @@ static int kvm_irqchip_create(MachineState *machine, KVMState *s)
     return 0;
 }
 
+int kvm_vfio_get_device_irq(KVMState *s, int fd, int index,
+                            int start, int count, qemu_irq irq,
+                            struct kvm_vfio_dev_irq **vfio_dev_irq)
+{
+    gpointer key, gsi;
+    gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
+    struct kvm_vfio_dev_irq *pirq;
+    __u32 *pgsi;
+    int argsz;
+
+    if (!found) {
+        return -ENXIO;
+    }
+
+    argsz = sizeof(*pirq) + sizeof(*pgsi);
+    pirq = g_malloc0(argsz);
+    pirq->argsz = argsz;
+    pirq->fd = fd;
+    pirq->index = index;
+    pirq->start = start;
+    pirq->count = count;
+    pgsi = (__u32 *)&pirq->gsi;
+    *pgsi = GPOINTER_TO_INT(gsi);
+    *vfio_dev_irq = pirq;
+    return 0;
+}
+
+void kvm_vfio_put_device_irq(struct kvm_vfio_dev_irq *vfio_dev_irq)
+{
+    g_free(vfio_dev_irq);
+}
+
 /* Find number of supported CPUs using the recommended
  * procedure from the kernel API documentation to cope with
  * older kernels that may be missing capabilities.
-- 
1.8.3.2