hw/i386: Fix 'use-legacy-x86-rom' property compatibility

Commit 350785d41d ("ramfb: Add property to control if load the
romfile") introduced the `use-legacy-x86-rom` property for the
`vfio-pci-nohotplug` device, allowing control over VGA BIOS ROM
loading. However, the property compatibility setting was incorrectly
applied to the `vfio-pci` device instead, which causes all `vfio-pci`
devices to fail to load. This change fixes the issue by ensuring the
property is set on the correct device.

Fixes: d5fcf0d960 ("hw/i386: Add the ramfb romfile compatibility")
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Shaoqin Huang <shahuang@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250723062714.1245826-1-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

hw/core/machine.c

@@ -41,7 +41,7 @@ GlobalProperty hw_compat_10_0[] = {
     { "scsi-hd", "dpofua", "off" },
     { "vfio-pci", "x-migration-load-config-after-iter", "off" },
     { "ramfb", "use-legacy-x86-rom", "true"},
-    { "vfio-pci", "use-legacy-x86-rom", "true" },
+    { "vfio-pci-nohotplug", "use-legacy-x86-rom", "true" },
 };
 const size_t hw_compat_10_0_len = G_N_ELEMENTS(hw_compat_10_0);
 

hw/i386/microvm.c

@@ -635,7 +635,7 @@ GlobalProperty microvm_properties[] = {
      */
     { "pcie-root-port", "io-reserve", "0" },
     { TYPE_RAMFB_DEVICE, "use-legacy-x86-rom", "true" },
-    { TYPE_VFIO_PCI, "use-legacy-x86-rom", "true" },
+    { TYPE_VFIO_PCI_NOHOTPLUG, "use-legacy-x86-rom", "true" },
 };
 
 static void microvm_class_init(ObjectClass *oc, const void *data)

hw/i386/pc_piix.c

@@ -80,7 +80,7 @@ static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
 
 static GlobalProperty pc_piix_compat_defaults[] = {
     { TYPE_RAMFB_DEVICE, "use-legacy-x86-rom", "true" },
-    { TYPE_VFIO_PCI, "use-legacy-x86-rom", "true" },
+    { TYPE_VFIO_PCI_NOHOTPLUG, "use-legacy-x86-rom", "true" },
 };
 static const size_t pc_piix_compat_defaults_len =
     G_N_ELEMENTS(pc_piix_compat_defaults);

hw/i386/pc_q35.c

@@ -69,7 +69,7 @@
 static GlobalProperty pc_q35_compat_defaults[] = {
     { TYPE_VIRTIO_IOMMU_PCI, "aw-bits", "39" },
     { TYPE_RAMFB_DEVICE, "use-legacy-x86-rom", "true" },
-    { TYPE_VFIO_PCI, "use-legacy-x86-rom", "true" },
+    { TYPE_VFIO_PCI_NOHOTPLUG, "use-legacy-x86-rom", "true" },
 };
 static const size_t pc_q35_compat_defaults_len =
     G_N_ELEMENTS(pc_q35_compat_defaults);

hw/vfio/pci.c

@@ -49,8 +49,6 @@
 #include "vfio-migration-internal.h"
 #include "vfio-helpers.h"
 
-#define TYPE_VFIO_PCI_NOHOTPLUG "vfio-pci-nohotplug"
-
 /* Protected by BQL */
 static KVMRouteChange vfio_route_change;
 

hw/vfio/types.h

@@ -18,4 +18,6 @@
 #define TYPE_VFIO_PCI "vfio-pci"
 /* TYPE_VFIO_PCI shares struct VFIOPCIDevice. */
 
+#define TYPE_VFIO_PCI_NOHOTPLUG "vfio-pci-nohotplug"
+
 #endif /* HW_VFIO_VFIO_TYPES_H */