[PATCH v2 0/8] Initial support for SMMUv3 nested translation

[Shameerali Kolothum Thodi]

> -----Original Message-----
> From: Shameerali Kolothum Thodi
> Sent: Thursday, August 29, 2024 2:15 PM
> To: 'Nicolin Chen' <nicolinc at nvidia.com>
> Cc: Jason Gunthorpe <jgg at nvidia.com>; acpica-devel at lists.linux.dev;
> Guohanjun (Hanjun Guo) <guohanjun at huawei.com>;
> iommu at lists.linux.dev; Joerg Roedel <joro at 8bytes.org>; Kevin Tian
> <kevin.tian at intel.com>; kvm at vger.kernel.org; Len Brown
> <lenb at kernel.org>; linux-acpi at vger.kernel.org; linux-arm-
> kernel at lists.infradead.org; Lorenzo Pieralisi <lpieralisi at kernel.org>; Rafael J.
> Wysocki <rafael at kernel.org>; Robert Moore <robert.moore at intel.com>;
> Robin Murphy <robin.murphy at arm.com>; Sudeep Holla
> <sudeep.holla at arm.com>; Will Deacon <will at kernel.org>; Alex Williamson
> <alex.williamson at redhat.com>; Eric Auger <eric.auger at redhat.com>; Jean-
> Philippe Brucker <jean-philippe at linaro.org>; Moritz Fischer
> <mdf at kernel.org>; Michael Shavit <mshavit at google.com>;
> patches at lists.linux.dev; Mostafa Saleh <smostafa at google.com>
> 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 at ubuntu:/# lspci -tv#
> 
> root at 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