This bug was fixed in the package linux-nvidia-6.11 - 6.11.0-1011.11
---------------
linux-nvidia-6.11 (6.11.0-1011.11) noble; urgency=medium
* noble/linux-nvidia-6.11: 6.11.0-1011.11 -proposed tracker (LP:
#2114931)
* NVIDIA: SAUCE: Add quirk to disable secondary-bus-reset on PCIe gen-4
ports (LP: #2114759)
- NVIDIA: SAUCE: MEDIATEK: pcie: disable SBR on Gen4 Ports
* Pick from upstream: "wifi: mt76: mt7925: fix host interrupt register
initialization" (LP: #2114232)
- wifi: mt76: mt7925: fix host interrupt register initialization
* ASPM Backports for DGX Spark (LP: #2114757)
- PCI/ASPM: Disable L1 before disabling L1 PM Substates
- PCI/ASPM: Add notes about enabling PCI-PM L1SS to
pci_enable_link_state(_locked)
- PCI/ASPM: Save parent L1SS config in pci_save_aspm_l1ss_state()
- PCI/ASPM: Fix L1SS saving
- PCI/ASPM: Fix link state exit during switch upstream function removal
* NVIDIA: SAUCE: Add FFA and EC Secure Service Driver to -nvidia kernel
(LP: #2114230)
- NVIDIA: SAUCE: Add support for custom ARM FFH offset handler
- NVIDIA: SAUCE: Add nvidia ffa driver for EC communication
- NVIDIA: SAUCE: Add ffa driver for each secure EC service
- NVIDIA: SAUCE: Add support for EC secure service communication
- NVIDIA: SAUCE: Rescan acpi devices that uses secure EC communication
- NVIDIA: SAUCE: irqchip/gic-v3: Allow unused SGIs for drivers/modules
- NVIDIA: SAUCE: Add support for notifications from secure EC services
- [Config] nvidia-6.11: Update annotations to enable NVIDIA FFA EC driver
* Pull request: KVM: selftests: Always unlink memory regions when deleting
(LP: #2112594)
- KVM: selftests: Always unlink memory regions when deleting (VM free)
- KVM: selftests: Don't bother deleting memslots in KVM when freeing VMs
* IOMMU: Support contiguous bit in translation tables (LP: #2112600)
- NVIDIA: SAUCE: iommu/io-pgtable-arm: backport contiguous bit support
* Backport pci=config_acs parameter with fix commit (LP: #2100340)
- PCI/ACS: Fix 'pci=config_acs=' parameter
- iommu: Skip PASID validation for devices without PASID capability
-- Jacob Martin <[email protected]> Wed, 18 Jun 2025 16:35:12
-0500
** Changed in: linux-nvidia-6.11 (Ubuntu Noble)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2100340
Title:
Backport pci=config_acs parameter with fix commit
Status in linux package in Ubuntu:
Invalid
Status in linux-nvidia package in Ubuntu:
Invalid
Status in linux-nvidia-6.11 package in Ubuntu:
Invalid
Status in linux-nvidia-6.14 package in Ubuntu:
Invalid
Status in linux-nvidia-6.8 package in Ubuntu:
Invalid
Status in linux-nvidia-lowlatency package in Ubuntu:
Invalid
Status in linux-nvidia-6.8 source package in Jammy:
Fix Committed
Status in linux source package in Noble:
Fix Committed
Status in linux-nvidia source package in Noble:
Fix Released
Status in linux-nvidia-6.11 source package in Noble:
Fix Released
Status in linux-nvidia-6.14 source package in Noble:
Fix Committed
Status in linux-nvidia-lowlatency source package in Noble:
Fix Committed
Status in linux source package in Oracular:
Fix Released
Status in linux source package in Plucky:
Fix Released
Bug description:
Linux kernel upstream Commit 47c8846a49ba ("PCI: Extend ACS
configurability") introduced bugs that fail to configure ACS ctrl to
the value specified by the kernel parameter. Essentially there are two
bugs:
1) When ACS is configured for multiple PCI devices using 'config_acs'
kernel parameter, it results into error "PCI: Can't parse ACS command
line parameter". This is due to a bug that doesn't preserve the ACS
mask, but instead overwrites the mask with value 0.
For example, using 'config_acs' to configure ACS ctrl for multiple BDFs
fails:
Kernel command line:
pci=config_acs=1111011@0020:02:00.0;101xxxx@0039:00:00.0 "dyndbg=file
drivers/pci/pci.c +p"
PCI: Can't parse ACS command line parameter
pci 0020:02:00.0: ACS mask = 0x007f
pci 0020:02:00.0: ACS flags = 0x007b
pci 0020:02:00.0: Configured ACS to 0x007b
After this fix:
Kernel command line:
pci=config_acs=1111011@0020:02:00.0;101xxxx@0039:00:00.0 "dyndbg=file
drivers/pci/pci.c +p"
pci 0020:02:00.0: ACS mask = 0x007f
pci 0020:02:00.0: ACS flags = 0x007b
pci 0020:02:00.0: ACS control = 0x005f
pci 0020:02:00.0: ACS fw_ctrl = 0x0053
pci 0020:02:00.0: Configured ACS to 0x007b
pci 0039:00:00.0: ACS mask = 0x0070
pci 0039:00:00.0: ACS flags = 0x0050
pci 0039:00:00.0: ACS control = 0x001d
pci 0039:00:00.0: ACS fw_ctrl = 0x0000
pci 0039:00:00.0: Configured ACS to 0x0050
2) In the bit manipulation logic, we copy the bit from the firmware
settings when mask bit 0.
For example, 'disable_acs_redir' fails to clear all three ACS P2P redir
bits due to the wrong bit fiddling:
Kernel command line:
pci=disable_acs_redir=0020:02:00.0;0030:02:00.0;0039:00:00.0 "dyndbg=file
drivers/pci/pci.c +p"
pci 0020:02:00.0: ACS mask = 0x002c
pci 0020:02:00.0: ACS flags = 0xffd3
pci 0020:02:00.0: Configured ACS to 0xfffb
pci 0030:02:00.0: ACS mask = 0x002c
pci 0030:02:00.0: ACS flags = 0xffd3
pci 0030:02:00.0: Configured ACS to 0xffdf
pci 0039:00:00.0: ACS mask = 0x002c
pci 0039:00:00.0: ACS flags = 0xffd3
pci 0039:00:00.0: Configured ACS to 0xffd3
After this fix:
Kernel command line:
pci=disable_acs_redir=0020:02:00.0;0030:02:00.0;0039:00:00.0 "dyndbg=file
drivers/pci/pci.c +p"
pci 0020:02:00.0: ACS mask = 0x002c
pci 0020:02:00.0: ACS flags = 0xffd3
pci 0020:02:00.0: ACS control = 0x007f
pci 0020:02:00.0: ACS fw_ctrl = 0x007b
pci 0020:02:00.0: Configured ACS to 0x0053
pci 0030:02:00.0: ACS mask = 0x002c
pci 0030:02:00.0: ACS flags = 0xffd3
pci 0030:02:00.0: ACS control = 0x005f
pci 0030:02:00.0: ACS fw_ctrl = 0x005f
pci 0030:02:00.0: Configured ACS to 0x0053
pci 0039:00:00.0: ACS mask = 0x002c
pci 0039:00:00.0: ACS flags = 0xffd3
pci 0039:00:00.0: ACS control = 0x001d
pci 0039:00:00.0: ACS fw_ctrl = 0x0000
pci 0039:00:00.0: Configured ACS to 0x0000
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