[Qemu-devel] [PATCH 1/1] display/bochs: fix pcie support

[Gerd Hoffmann <kraxel@redhat.com>]

Set QEMU_PCI_CAP_EXPRESS unconditionally in init(), then clear it in
realize() in case the device is not connected to a PCIe bus.

This makes sure the pci config space allocation is big enough, so
accessing the PCIe extended config space doesn't overflow the pci
config space buffer.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/bochs-display.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/hw/display/bochs-display.c b/hw/display/bochs-display.c
index 582133dd719c..8e83b5164b67 100644
--- a/hw/display/bochs-display.c
+++ b/hw/display/bochs-display.c
@@ -297,9 +297,10 @@ static void bochs_display_realize(PCIDevice *dev, Error **errp)
     }
 
     if (pci_bus_is_express(pci_get_bus(dev))) {
-        dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
         ret = pcie_endpoint_cap_init(dev, 0x80);
         assert(ret > 0);
+    } else {
+        dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS;
     }
 
     memory_region_set_log(&s->vram, true, DIRTY_MEMORY_VGA);
@@ -322,11 +323,15 @@ static void bochs_display_set_big_endian_fb(Object *obj, bool value,
 
 static void bochs_display_init(Object *obj)
 {
+    PCIDevice *dev = PCI_DEVICE(obj);
+
     /* Expose framebuffer byteorder via QOM */
     object_property_add_bool(obj, "big-endian-framebuffer",
                              bochs_display_get_big_endian_fb,
                              bochs_display_set_big_endian_fb,
                              NULL);
+
+    dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
 }
 
 static void bochs_display_exit(PCIDevice *dev)
-- 
2.18.1