What were you trying to do that didn't work?

Guest failed to boot with pcie-expander-bus and pcie-switch-upstream-port

Please provide the package NVR for which the bug is seen:

edk2-aarch64-20241117-2.el10.noarch

qemu-kvm-9.1.0-10.el10.aarch64

How reproducible is this bug?:

100%

Steps to reproduce

1. Boot guest with pcie-expander-bus  -> pcie-root-port -> pcie-switch-upstream-port
    <controller type='pci' index='2' model='pcie-expander-bus'>
      <model name='pxb-pcie'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </controller>
    <controller type='pci' index='3' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
    </controller>
    <controller type='pci'  model='pcie-switch-upstream-port'>
      <model name='x3130-upstream'/>
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
    </controller>
2. Boot fail
UEFI Interactive Shell v2.2
EDK II
UEFI v2.70 (EDK II, 0x00010000)
map: No mapping found.
Press ESC in 1 seconds to skip startup.nsh or any other key to continue.
Shell>
 
3. If I remove x3130-upstream , the guest can be booted.
 
 <controller type='pci'  model='pcie-switch-upstream-port'>
      <model name='x3130-upstream'/>
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
    </controller>
 

Expected results

Guest is booted

Actual results

Guest failed to boot