[Qemu-devel] [PATCH 2/2] all vga: fail graicefully when vga ports are taken

[Gerd Hoffmann <kraxel@redhat.com>]

Try to pci hotplug a vga card, watch qemu die with hw_error().
This patch fixes it.

[v2: code style fixes]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/cirrus_vga.c |    4 ++++
 hw/vga-pci.c    |    4 ++++
 hw/vmware_vga.c |    4 ++++
 3 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 9f61a01..977abd2 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -3189,6 +3189,10 @@ static int pci_cirrus_vga_initfn(PCIDevice *dev)
      uint8_t *pci_conf = d->dev.config;
      int device_id = CIRRUS_ID_CLGD5446;
 
+     if (is_ioport_assigned(0x3c0)) {
+         return -1;
+     }
+
      /* setup VGA */
      vga_common_init(&s->vga, VGA_RAM_SIZE);
      cirrus_init_common(s, device_id, 1);
diff --git a/hw/vga-pci.c b/hw/vga-pci.c
index c8d260c..9fa0bfb 100644
--- a/hw/vga-pci.c
+++ b/hw/vga-pci.c
@@ -79,6 +79,10 @@ static int pci_vga_initfn(PCIDevice *dev)
      VGACommonState *s = &d->vga;
      uint8_t *pci_conf = d->dev.config;
 
+     if (is_ioport_assigned(0x3c0)) {
+         return -1;
+     }
+
      // vga + console init
      vga_common_init(s, VGA_RAM_SIZE);
      vga_init(s);
diff --git a/hw/vmware_vga.c b/hw/vmware_vga.c
index 4e7a75d..7a8cec0 100644
--- a/hw/vmware_vga.c
+++ b/hw/vmware_vga.c
@@ -1232,6 +1232,10 @@ static int pci_vmsvga_initfn(PCIDevice *dev)
     struct pci_vmsvga_state_s *s =
         DO_UPCAST(struct pci_vmsvga_state_s, card, dev);
 
+    if (is_ioport_assigned(0x3c0)) {
+        return -1;
+    }
+
     pci_config_set_vendor_id(s->card.config, PCI_VENDOR_ID_VMWARE);
     pci_config_set_device_id(s->card.config, SVGA_PCI_DEVICE_ID);
     s->card.config[PCI_COMMAND]	= PCI_COMMAND_IO |
-- 
1.6.6.1