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+Legacy IGD passthrough in QEMU 5 disabled
+
+Bug with tag v5.0.0, or commit fdd76fecdde1ad444ff4deb7f1c4f7e4a1ef97d6
+
+As of QEMU 5 Legacy IGD PT is no longer working.
+
+Host is a Xeon E3-1226 v3 and my method to test is to run the following:
+
+./qemu-system-x86_64 \
+  -device 'pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1f' \
+  -device 'vfio-pci,host=00:02.0,addr=02.0' \
+  -L '/usr/share/kvm' \
+  -nographic \
+  -vga none \
+  -nodefaults
+
+in the hope of seeing a "IGD device 0000:00:02.0 cannot support legacy mode due to existing devices at address 1f.0" error.
+
+The culprit appears to be this commit:
+
+https://github.com/qemu/qemu/commit/29d62771c81d8fd244a67c14a1d968c268d3fb19
+
+Specifically the following block in pci-quirks.c:
+
+#ifdef CONFIG_VFIO_IGD
+    vfio_probe_igd_bar4_quirk(vdev, nr);
+#endif
+
+as the kconfig variable CONFIG_VFIO_IGD doesn't appear to be available outside of makefiles as described here: https://qemu.weilnetz.de/doc/devel/kconfig.html. I can confirm that the igd code is being pulled in as removing this check, as would defining the variable I presume, makes Legacy IGD PT work again (ie I see the expected "existing devices" error).
+
+I first spotted this in Proxmox, but have confirmed the bug by building QEMU sources.
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