[Qemu-devel] [v7][PATCH 08/10] xen, gfx passthrough: register a isa bridge

[Tiejun Chen <tiejun.chen@intel.com>]

Currently we just register this isa bridge when we use IGD
passthrough in Xen side.

Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
---
 hw/xen/xen_pt.c      | 18 ++++++++++++++++++
 include/hw/xen/xen.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index fcc9f1c..2d5cebb 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -632,6 +632,21 @@ static const MemoryListener xen_pt_io_listener = {
     .priority = 10,
 };
 
+static void
+xen_igd_passthrough_isa_bridge_create(XenPCIPassthroughState *s,
+                                      XenHostPCIDevice *dev)
+{
+    uint16_t gpu_dev_id;
+    PCIDevice *d = &s->dev;
+
+    if (!is_igd_vga_passthrough(dev)) {
+        return;
+    }
+
+    gpu_dev_id = dev->device_id;
+    igd_passthrough_isa_bridge_create(d->bus, gpu_dev_id);
+}
+
 /* init */
 
 static int xen_pt_initfn(PCIDevice *d)
@@ -680,6 +695,9 @@ static int xen_pt_initfn(PCIDevice *d)
             xen_host_pci_device_put(&s->real_device);
             return -1;
         }
+
+        /* Register ISA bridge for passthrough GFX. */
+        xen_igd_passthrough_isa_bridge_create(s, &s->real_device);
     }
 
     /* Handle real device's MMIO/PIO BARs */
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index 4356af4..703148e 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -51,4 +51,5 @@ void xen_register_framebuffer(struct MemoryRegion *mr);
 #  define HVM_MAX_VCPUS 32
 #endif
 
+extern void igd_passthrough_isa_bridge_create(PCIBus *bus, uint16_t gpu_dev_id);
 #endif /* QEMU_HW_XEN_H */
-- 
1.9.1