-----Original Message-----
From: Shameerali Kolothum Thodi
Sent: Thursday, August 29, 2024 2:15 PM
To: 'Nicolin Chen' <redacted>
Cc: Jason Gunthorpe <jgg@nvidia.com>; acpica-devel@lists.linux.dev;
Guohanjun (Hanjun Guo) [off-list ref];
iommu@lists.linux.dev; Joerg Roedel [off-list ref]; Kevin Tian
[off-list ref]; kvm@vger.kernel.org; Len Brown
[off-list ref]; linux-acpi@vger.kernel.org; linux-arm-
kernel@lists.infradead.org; Lorenzo Pieralisi [off-list ref]; Rafael J.
Wysocki [off-list ref]; Robert Moore [off-list ref];
Robin Murphy [off-list ref]; Sudeep Holla
[off-list ref]; Will Deacon [off-list ref]; Alex Williamson
[off-list ref]; Eric Auger [off-list ref]; Jean-
Philippe Brucker [off-list ref]; Moritz Fischer
[off-list ref]; Michael Shavit [off-list ref];
patches@lists.linux.dev; Mostafa Saleh [off-list ref]
Subject: RE: [PATCH v2 0/8] Initial support for SMMUv3 nested translation

That makes some progress. But still I am not seeing the assigned dev  in
Guest.

-device vfio-pci-nohotplug,host=0000:75:00.1,iommufd=iommufd0

root@ubuntu:/# lspci -tv#

root@ubuntu:/# lspci -tv
-+-[0000:ca]---00.0-[cb]--
 \-[0000:00]-+-00.0  Red Hat, Inc. QEMU PCIe Host bridge
             +-01.0  Red Hat, Inc Virtio network device
             +-02.0  Red Hat, Inc. QEMU PCIe Expander bridge
             +-03.0  Red Hat, Inc. QEMU PCIe Expander bridge
             +-04.0  Red Hat, Inc. QEMU PCIe Expander bridge
             +-05.0  Red Hat, Inc. QEMU PCIe Expander bridge
             +-06.0  Red Hat, Inc. QEMU PCIe Expander bridge
             +-07.0  Red Hat, Inc. QEMU PCIe Expander bridge
             +-08.0  Red Hat, Inc. QEMU PCIe Expander bridge
             \-09.0  Red Hat, Inc. QEMU PCIe Expander bridge

The new root port is created, but no device attached.

It looks like Guest finds the config invalid:

[    0.283618] PCI host bridge to bus 0000:ca
[    0.284064] ACPI BIOS Error (bug): \_SB.PCF7.PCEE.PCE5.PCDC.PCD3.PCCA._DSM: Excess arguments - ASL declared 5, ACPI requires 4 (20240322/nsarguments-162)
[    0.285533] pci_bus 0000:ca: root bus resource [bus ca]
[    0.286214] pci 0000:ca:00.0: [1b36:000c] type 01 class 0x060400 PCIe Root Port
[    0.287717] pci 0000:ca:00.0: BAR 0 [mem 0x00000000-0x00000fff]
[    0.288431] pci 0000:ca:00.0: PCI bridge to [bus 00]
[    0.290649] pci 0000:ca:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[    0.292476] pci_bus 0000:cb: busn_res: can not insert [bus cb-ca] under [bus ca] (conflicts with (null) [bus ca])
[    0.293597] pci_bus 0000:cb: busn_res: [bus cb-ca] end is updated to cb
[    0.294300] pci_bus 0000:cb: busn_res: can not insert [bus cb] under [bus ca] (conflicts with (null) [bus ca])

Let me know if you have any clue. 

Thanks,
Shameer