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

Shameerali Kolothum Thodi
2024-08-29T14:53:48Z

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