Qemu uses the pci subsystem id not only for emulated devices, but also
for virtio devices and generic pci class devices such as pci bridges,
xhci + nvme controllers etc.  Update the documentation accordingly.

Signed-off-by: Gerd Hoffmann <[email protected]>
---
 docs/specs/pci-ids.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/specs/pci-ids.rst b/docs/specs/pci-ids.rst
index 261b0f359fe5..832f8bd1b802 100644
--- a/docs/specs/pci-ids.rst
+++ b/docs/specs/pci-ids.rst
@@ -46,8 +46,9 @@ maintained as part of the virtio specification.
   upstream merge or shipping a distro/product) to avoid conflicts.
 
 1af4:1100
-  Used as PCI Subsystem ID for existing hardware devices emulated
-  by QEMU.
+  Used as PCI Subsystem ID for existing hardware devices emulated by
+  QEMU, such as the intel chipset devices.  Also used for virtio
+  devices and generic pci class devices (1b36:00xx, see below).
 
 1af4:1110
   ivshmem device (:doc:`ivshmem-spec`)
-- 
2.56.0


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