[Qemu-devel] [v9][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>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
v9:

* Move is_igd_vga_passthrough(dev)) from xen_igd_passthrough_isa_bridge_create()
  into xen_pt_initfn().

 hw/xen/xen_pt.c      | 21 +++++++++++++++++++++
 include/hw/xen/xen.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index 15b02cb..f764131 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -684,6 +684,17 @@ 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;
+
+    gpu_dev_id = dev->device_id;
+    igd_passthrough_isa_bridge_create(d->bus, gpu_dev_id);
+}
+
 /* init */
 
 static int xen_pt_initfn(PCIDevice *d)
@@ -728,11 +739,21 @@ static int xen_pt_initfn(PCIDevice *d)
     /* Setup VGA bios for passthrough GFX */
     if ((s->real_device.domain == 0) && (s->real_device.bus == 0) &&
         (s->real_device.dev == 2) && (s->real_device.func == 0)) {
+        if (!is_igd_vga_passthrough(&s->real_device)) {
+            XEN_PT_ERR(d, "Need to enable igd-passthru if you're trying"
+                       " to passthrough IGD GFX.\n");
+            xen_host_pci_device_put(&s->real_device);
+            return -1;
+        }
+
         if (xen_pt_setup_vga(s, &s->real_device) < 0) {
             XEN_PT_ERR(d, "Setup VGA BIOS of passthrough GFX failed!\n");
             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