[PATCH v4 1/4] hw/pci: Introduce romfile_fixup hook in PCIDevice

[Tomita Moeko <tomitamoeko@gmail.com>]

Some devices, such as VFIO IGD passthrough, require device-specific
fixups on the romfile provided by user. Add an optional romfile_fixup
hook to PCIDevice. When set, it is invoked from pci_add_option_rom()
right after the image is loaded, receiving the ROM buffer and its
size. This provides a place to post-process a loaded romfile without
leaking device-specific logic into the generic PCI core.

Reported-by: K S Maan <kirandeepmaan45@gmail.com>
Signed-off-by: Tomita Moeko <tomitamoeko@gmail.com>
---
 hw/pci/pci.c                | 4 ++++
 include/hw/pci/pci_device.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 4298adf5a0..7d30d44411 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2632,6 +2632,10 @@ static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom,
             /* Only the default rom images will be patched (if needed). */
             pci_patch_ids(pdev, ptr, size);
         }
+
+        if (pdev->romfile_fixup) {
+            pdev->romfile_fixup(pdev, ptr, size);
+        }
     }
 
     pci_register_bar(pdev, PCI_ROM_SLOT, 0, &pdev->rom);
diff --git a/include/hw/pci/pci_device.h b/include/hw/pci/pci_device.h
index 5cac6e1688..a65e77018c 100644
--- a/include/hw/pci/pci_device.h
+++ b/include/hw/pci/pci_device.h
@@ -159,6 +159,7 @@ struct PCIDevice {
     bool has_rom;
     MemoryRegion rom;
     int32_t rom_bar;
+    void (*romfile_fixup)(PCIDevice *pdev, uint8_t *ptr, uint32_t size);
 
     /* INTx routing notifier */
     PCIINTxRoutingNotifier intx_routing_notifier;
-- 
2.53.0