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[PATCH v9 net-next 00/15] AccECN protocol patch series

by chia-yu.chang＠nokia-bell-labs.com

From: Chia-Yu Chang <chia-yu.chang(a)nokia-bell-labs.com> Hello, Please find the v9 AccECN protocol patch series, which covers the core functionality of Accurate ECN, AccECN negotiation, AccECN TCP options, and AccECN failure handling. The Accurate ECN draft can be found in https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-28 This patch series is part of the full AccECN patch series, which is available at https://github.com/L4STeam/linux-net-next/commits/upstream_l4steam/ Best Regards, Chia-Yu --- v9 (21-Jun-2025) - Use tcp_data_ecn_check() to set TCP_ECN_SEE flag only for RFC3168 ECN (Paolo Abeni <pabeni(a)redhat.com>) - Add comments about setting TCP_ECN_SEEN flag for RFC3168 and Accruate ECN (Paolo Abeni <pabeni(a)redhat.com>) - Restruct the code in the for loop of tcp_accecn_process_option() (Paolo Abeni <pabeni(a)redhat.com>) - Remove ecn_bytes and add use_synack_ecn_bytes flag to identify whether syn_ack_bytes or received_ecn_bytes is used (Paolo Abeni <pabeni(a)redhat.com>) - Replace leftover_bytes and leftover_size with leftover_highbyte and leftover_lowbyte and add comments in tcp_options_write() (Paolo Abeni <pabeni(a)redhat.com>) - Add comments and commit message about the 1st retx SYN still attempt AccECN negotiation (Paolo Abeni <pabeni(a)redhat.com>) v8 (10-Jun-2025) - Add new helper function tcp_ecn_received_counters_payload() in #6 (Paolo Abeni <pabeni(a)redhat.com>) - Set opts->num_sack_blocks=0 to avoid potential undefined value in #8 (Paolo Abeni <pabeni(a)redhat.com>) - Reset leftover_size to 2 once leftover_bytes is used in #9 (Paolo Abeni <pabeni(a)redhat.com>) - Add new helper function tcp_accecn_opt_demand_min() in #10 (Paolo Abeni <pabeni(a)redhat.com>) - Add new helper function tcp_accecn_saw_opt_fail_recv() in #11 (Paolo Abeni <pabeni(a)redhat.com>) - Update tcp_options_fit_accecn() to avoid using recursion in #14 (Paolo Abeni <pabeni(a)redhat.com>) v7 (14-May-2025) - Modify group sizes of tcp_sock_write_txrx and tcp_sock_write_rx in #3 based on pahole results (Paolo Abeni <pabeni(a)redhat.com>) - Fix the issue in #4 and #5 where the RFC3168 ECN behavior in tcp_ecn_send() is changed (Paolo Abeni <pabeni(a)redhat.com>) - Modify group size of tcp_sock_write_txrx in #4 and #6 based on pahole results (Paolo Abeni <pabeni(a)redhat.com>) - Update commit message for #9 to explain the increase in tcp_sock_write_rx group size - Modify group size of tcp_sock_write_tx in #10 based on pahole results v6 (09-May-2025) - Add #3 to utilize exisintg holes of tcp_sock_write_txrx group for later patches (#4, #9, #10) with new u8 members (Paolo Abeni <pabeni(a)redhat.com>) - Add pahole outcomes before and after commit in #4, #5, #6, #9, #10, #15 (Paolo Abeni <pabeni(a)redhat.com>) - Define new helper function tcp_send_ack_reflect_ect() for sending ACK with reflected ECT in #5 (Paolo Abeni <pabeni(a)redhat.com>) - Add comments for function tcp_ecn_rcv_synack() in #5 (Paolo Abeni <pabeni(a)redhat.com>) - Add enum/define to be used by sysctl_tcp_ecn in #5, sysctl_tcp_ecn_option in #9, and sysctl_tcp_ecn_option_beacon in #10 (Paolo Abeni <pabeni(a)redhat.com>) - Move accecn_fail_mode and saw_accecn_opt in #5 and #11 to use exisintg holes of tcp_sock (Paolo Abeni <pabeni(a)redhat.com>) - Change data type of new members of tcp_request_sock and move them to the end of struct in #5 and #11 (Paolo Abeni <pabeni(a)redhat.com>) - Move new members of tcp_info to the end of struct in #6 (Paolo Abeni <pabeni(a)redhat.com>) - Merge previous #7 into #9 (Paolo Abeni <pabeni(a)redhat.com>) - Mask ecnfield with INET_ECN_MASK to remove WARN_ONCE in #9 (Paolo Abeni <pabeni(a)redhat.com>) - Reduce the indentation levels for reabability in #9 and #10 (Paolo Abeni <pabeni(a)redhat.com>) - Move delivered_ecn_bytes to the RX group in #9, accecn_opt_tstamp to the TX group in #10, pkts_acked_ewma to the RX group in #15 (Paolo Abeni <pabeni(a)redhat.com>) - Add changes in Documentation/networking/net_cachelines/tcp_sock.rst for new tcp_sock members in #3, #5, #6, #9, #10, #15 v5 (22-Apr-2025) - Further fix for 32-bit ARM alignment in tcp.c (Simon Horman <horms(a)kernel.org>) v4 (18-Apr-2025) - Fix 32-bit ARM assertion for alignment requirement (Simon Horman <horms(a)kernel.org>) v3 (14-Apr-2025) - Fix patch apply issue in v2 (Jakub Kicinski <kuba(a)kernel.org>) v2 (18-Mar-2025) - Add one missing patch from the previous AccECN protocol preparation patch series to this patch series. --- Chia-Yu Chang (3): tcp: reorganize tcp_sock_write_txrx group for variables later tcp: accecn: AccECN option failure handling tcp: accecn: try to fit AccECN option with SACK Ilpo Järvinen (12): tcp: reorganize SYN ECN code tcp: fast path functions later tcp: AccECN core tcp: accecn: AccECN negotiation tcp: accecn: add AccECN rx byte counters tcp: accecn: AccECN needs to know delivered bytes tcp: sack option handling improvements tcp: accecn: AccECN option tcp: accecn: AccECN option send control tcp: accecn: AccECN option ceb/cep heuristic tcp: accecn: AccECN ACE field multi-wrap heuristic tcp: try to avoid safer when ACKs are thinned .../networking/net_cachelines/tcp_sock.rst | 14 + include/linux/tcp.h | 34 +- include/net/netns/ipv4.h | 2 + include/net/tcp.h | 225 ++++++- include/uapi/linux/tcp.h | 7 + net/ipv4/syncookies.c | 3 + net/ipv4/sysctl_net_ipv4.c | 19 + net/ipv4/tcp.c | 30 +- net/ipv4/tcp_input.c | 622 +++++++++++++++++- net/ipv4/tcp_ipv4.c | 7 +- net/ipv4/tcp_minisocks.c | 91 ++- net/ipv4/tcp_output.c | 325 ++++++++- net/ipv6/syncookies.c | 1 + net/ipv6/tcp_ipv6.c | 1 + 14 files changed, 1285 insertions(+), 96 deletions(-) -- 2.34.1

2 weeks, 4 days

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[PATCH net-next v3 0/3] selftest: net: Add selftest for netpoll

by Breno Leitao

I am submitting a new selftest for the netpoll subsystem specifically targeting the case where the RX is polling in the TX path, which is a case that we don't have any test in the tree today. This is done when netpoll_poll_dev() called, and this test creates a scenario when that is probably. The test does the following: 1) Configuring a single RX/TX queue to increase contention on the interface. 2) Generating background traffic to saturate the network, mimicking real-world congestion. 3) Sending netconsole messages to trigger netpoll polling and monitor its behavior. 4) Using dynamic netconsole targets via configfs, with the ability to delete and recreate targets during the test. 5) Running bpftrace in parallel to verify that netpoll_poll_dev() is called when expected. If it is called, then the test passes, otherwise the test is marked as skipped. In order to achieve it, I stole Jakub's bpftrace helper from [1], and did some small changes that I found useful to use the helper. So, this patchset basically contains: 1) The code stolen from Jakub 2) Improvements on bpftrace() helper 3) The selftest itself Link: https://lore.kernel.org/all/20250421222827.283737-22-kuba@kernel.org/ [1] --- Changes in v3: - Make pylint happy (Simon) - Remove the unnecessary patch in bpftrace to raise an exception when it fails. (Jakub) - Improved the bpftrace code (Willem) - Stop sending messages if bpftrace is not alive anymore. - Link to v2: https://lore.kernel.org/r/20250625-netpoll_test-v2-0-47d27775222c@debian.org Changes in v2: - Stole Jakub's helper to run bpftrace - Removed the DEBUG option and moved logs to logging - Change the code to have a higher chance of calling netpoll_poll_dev(). In my current configuration, it is hitting multiple times during the test. - Save and restore TX/RX queue size (Jakub) - Link to v1: https://lore.kernel.org/r/20250620-netpoll_test-v1-1-5068832f72fc@debian.org --- Breno Leitao (2): selftests: drv-net: Strip '@' prefix from bpftrace map keys selftests: net: add netpoll basic functionality test Jakub Kicinski (1): selftests: drv-net: add helper/wrapper for bpftrace tools/testing/selftests/drivers/net/Makefile | 1 + .../selftests/drivers/net/lib/py/__init__.py | 3 +- .../testing/selftests/drivers/net/netpoll_basic.py | 345 +++++++++++++++++++++ tools/testing/selftests/net/lib/py/utils.py | 35 +++ 4 files changed, 383 insertions(+), 1 deletion(-) --- base-commit: 8efa26fcbf8a7f783fd1ce7dd2a409e9b7758df0 change-id: 20250612-netpoll_test-a1324d2057c8 Best regards, -- Breno Leitao <leitao(a)debian.org>

2 weeks, 4 days

3
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[PATCH net-next 2/2] selftests: seg6: fix instaces typo in comments

by Andrea Mayer

Fix a typo: instaces -> instances The typo has been identified using codespell, and the tool does not report any additional issues in the selftests considered. Signed-off-by: Andrea Mayer <andrea.mayer(a)uniroma2.it> --- tools/testing/selftests/net/srv6_end_next_csid_l3vpn_test.sh | 2 +- tools/testing/selftests/net/srv6_end_x_next_csid_l3vpn_test.sh | 2 +- tools/testing/selftests/net/srv6_hencap_red_l3vpn_test.sh | 2 +- tools/testing/selftests/net/srv6_hl2encap_red_l2vpn_test.sh | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/net/srv6_end_next_csid_l3vpn_test.sh b/tools/testing/selftests/net/srv6_end_next_csid_l3vpn_test.sh index ba730655a7bf..4bc135e5c22c 100755 --- a/tools/testing/selftests/net/srv6_end_next_csid_l3vpn_test.sh +++ b/tools/testing/selftests/net/srv6_end_next_csid_l3vpn_test.sh @@ -594,7 +594,7 @@ setup_rt_local_sids() dev "${DUMMY_DEVNAME}" # all SIDs for VPNs start with a common locator. Routes and SRv6 - # Endpoint behavior instaces are grouped together in the 'localsid' + # Endpoint behavior instances are grouped together in the 'localsid' # table. ip -netns "${nsname}" -6 rule \ add to "${VPN_LOCATOR_SERVICE}::/16" \ diff --git a/tools/testing/selftests/net/srv6_end_x_next_csid_l3vpn_test.sh b/tools/testing/selftests/net/srv6_end_x_next_csid_l3vpn_test.sh index bedf0ce885c2..34b781a2ae74 100755 --- a/tools/testing/selftests/net/srv6_end_x_next_csid_l3vpn_test.sh +++ b/tools/testing/selftests/net/srv6_end_x_next_csid_l3vpn_test.sh @@ -681,7 +681,7 @@ setup_rt_local_sids() set_underlay_sids_reachability "${rt}" "${rt_neighs}" # all SIDs for VPNs start with a common locator. Routes and SRv6 - # Endpoint behavior instaces are grouped together in the 'localsid' + # Endpoint behavior instances are grouped together in the 'localsid' # table. ip -netns "${nsname}" -6 rule \ add to "${VPN_LOCATOR_SERVICE}::/16" \ diff --git a/tools/testing/selftests/net/srv6_hencap_red_l3vpn_test.sh b/tools/testing/selftests/net/srv6_hencap_red_l3vpn_test.sh index 3efce1718c5f..6a68c7eff1dc 100755 --- a/tools/testing/selftests/net/srv6_hencap_red_l3vpn_test.sh +++ b/tools/testing/selftests/net/srv6_hencap_red_l3vpn_test.sh @@ -395,7 +395,7 @@ setup_rt_local_sids() dev "${VRF_DEVNAME}" # all SIDs for VPNs start with a common locator. Routes and SRv6 - # Endpoint behavior instaces are grouped together in the 'localsid' + # Endpoint behavior instances are grouped together in the 'localsid' # table. ip -netns "${nsname}" -6 rule \ add to "${VPN_LOCATOR_SERVICE}::/16" \ diff --git a/tools/testing/selftests/net/srv6_hl2encap_red_l2vpn_test.sh b/tools/testing/selftests/net/srv6_hl2encap_red_l2vpn_test.sh index cabc70538ffe..0979b5316fdf 100755 --- a/tools/testing/selftests/net/srv6_hl2encap_red_l2vpn_test.sh +++ b/tools/testing/selftests/net/srv6_hl2encap_red_l2vpn_test.sh @@ -343,7 +343,7 @@ setup_rt_local_sids() encap seg6local action End dev "${DUMMY_DEVNAME}" # all SIDs for VPNs start with a common locator. Routes and SRv6 - # Endpoint behaviors instaces are grouped together in the 'localsid' + # Endpoint behaviors instances are grouped together in the 'localsid' # table. ip -netns "${nsname}" -6 rule add \ to "${VPN_LOCATOR_SERVICE}::/16" \ -- 2.20.1

2 weeks, 4 days

2
1
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Re: [PATCH] selftests/mm: add test for (BATCH_PROCESS)MADV_DONTNEED

by wang lian

I deeply appreciate for your criticism. This is my first patch and I will improve it based on what we have discussed so far.

2 weeks, 4 days

3
5
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[PATCH 0/3] arm64: Support FEAT_LSFE (Large System Float Extension)

by Mark Brown

FEAT_LSFE is optional from v9.5, it adds new instructions for atomic memory operations with floating point values. We have no immediate use for it in kernel, provide a hwcap so userspace can discover it and allow the ID register field to be exposed to KVM guests. Signed-off-by: Mark Brown <broonie(a)kernel.org> --- Mark Brown (3): arm64/hwcap: Add hwcap for FEAT_LSFE KVM: arm64: Expose FEAT_LSFE to guests kselftest/arm64: Add lsfe to the hwcaps test Documentation/arch/arm64/elf_hwcaps.rst | 4 ++++ arch/arm64/include/asm/hwcap.h | 1 + arch/arm64/include/uapi/asm/hwcap.h | 1 + arch/arm64/kernel/cpufeature.c | 2 ++ arch/arm64/kernel/cpuinfo.c | 1 + arch/arm64/kvm/sys_regs.c | 4 +++- tools/testing/selftests/arm64/abi/hwcap.c | 21 +++++++++++++++++++++ 7 files changed, 33 insertions(+), 1 deletion(-) --- base-commit: 86731a2a651e58953fc949573895f2fa6d456841 change-id: 20250625-arm64-lsfe-0810cf98adc2 Best regards, -- Mark Brown <broonie(a)kernel.org>

2 weeks, 4 days

2
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[PATCH 00/33] vfio: Introduce selftests for VFIO

by David Matlack

This series introduces VFIO selftests, located in tools/testing/selftests/vfio/. VFIO selftests aim to enable kernel developers to write and run tests that take the form of userspace programs that interact with VFIO and IOMMUFD uAPIs. VFIO selftests can be used to write functional tests for new features, regression tests for bugs, and performance tests for optimizations. These tests are designed to interact with real PCI devices, i.e. they do not rely on mocking out or faking any behavior in the kernel. This allows the tests to exercise not only VFIO but also IOMMUFD, the IOMMU driver, interrupt remapping, IRQ handling, etc. For more background on the motivation and design of this series, please see the RFC: https://lore.kernel.org/kvm/20250523233018.1702151-1-dmatlack@google.com/ This series can also be found on GitHub: https://github.com/dmatlack/linux/tree/vfio/selftests/v1 Changelog ----------------------------------------------------------------------- RFC: https://lore.kernel.org/kvm/20250523233018.1702151-1-dmatlack@google.com/ - Add symlink to linux/pci_ids.h instead of copying (Jason) - Add symlinks to drivers/dma/*/*.h instead of copying (Jason) - Automatically replicate vfio_dma_mapping_test across backing sources using fixture variants (Jason) - Automatically replicate vfio_dma_mapping_test and vfio_pci_driver_test across all iommu_modes using fixture variants (Jason) - Invert access() check in vfio_dma_mapping_test (me) - Use driver_override instead of add/remove_id (Alex) - Allow tests to get BDF from env var (Alex) - Use KSFT_FAIL instead of 1 to exit with failure (Alex) - Unconditionally create $(LIBVFIO_O_DIRS) to avoid target conflict with ../cgroup/lib/libcgroup.mk when building KVM selftests (me) - Allow VFIO selftests to run automatically by switching from TEST_GEN_PROGS_EXTENDED to TEST_GEN_PROGS. Automatically run selftests will use $VFIO_SELFTESTS_BDF environment variable to know which device to use (Alex) - Replace hardcoded SZ_4K with getpagesize() in vfio_dma_mapping_test to support platforms with other page sizes (me) - Make all global variables static where possible (me) - Pass argc and argv to test_harness_main() so that users can pass flags to the kselftest harness (me) Instructions ----------------------------------------------------------------------- Running VFIO selftests requires at a PCI device bound to vfio-pci for the tests to use. The address of this device is passed to the test as a segment:bus:device.function string, which must match the path to the device in /sys/bus/pci/devices/ (e.g. 0000:00:04.0). Once you have chosen a device, there is a helper script provided to unbind the device from its current driver, bind it to vfio-pci, export the environment variable $VFIO_SELFTESTS_BDF, and launch a shell: $ tools/testing/selftests/vfio/run.sh -d 0000:00:04.0 -s The -d option tells the script which device to use and the -s option tells the script to launch a shell. Additionally, the VFIO selftest vfio_dma_mapping_test has test cases that rely on HugeTLB pages being available, otherwise they are skipped. To enable those tests make sure at least 1 2MB and 1 1GB HugeTLB pages are available. $ echo 1 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages $ echo 1 > /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages To run all VFIO selftests using make: $ make -C tools/testing/selftests/vfio run_tests To run individual tests: $ tools/testing/selftests/vfio/vfio_dma_mapping_test $ tools/testing/selftests/vfio/vfio_dma_mapping_test -v iommufd_anonymous_hugetlb_2mb $ tools/testing/selftests/vfio/vfio_dma_mapping_test -r vfio_dma_mapping_test.iommufd_anonymous_hugetlb_2mb.dma_map_unmap The environment variable $VFIO_SELFTESTS_BDF can be overridden for a specific test by passing in the BDF on the command line as the last positional argument. $ tools/testing/selftests/vfio/vfio_dma_mapping_test 0000:00:04.0 $ tools/testing/selftests/vfio/vfio_dma_mapping_test -v iommufd_anonymous_hugetlb_2mb 0000:00:04.0 $ tools/testing/selftests/vfio/vfio_dma_mapping_test -r vfio_dma_mapping_test.iommufd_anonymous_hugetlb_2mb.dma_map_unmap 0000:00:04.0 When you are done, free the HugeTLB pages and exit the shell started by run.sh. Exiting the shell will cause the device to be unbound from vfio-pci and bound back to its original driver. $ echo 0 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages $ echo 0 > /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages $ exit It's also possible to use run.sh to run just a single test hermetically, rather than dropping into a shell: $ tools/testing/selftests/vfio/run.sh -d 0000:00:04.0 -- tools/testing/selftests/vfio/vfio_dma_mapping_test -v iommufd_anonymous Tests ----------------------------------------------------------------------- There are 5 tests in this series, mostly to demonstrate as a proof-of-concept: - tools/testing/selftests/vfio/vfio_pci_device_test.c - tools/testing/selftests/vfio/vfio_pci_driver_test.c - tools/testing/selftests/vfio/vfio_iommufd_setup_test.c - tools/testing/selftests/vfio/vfio_dma_mapping_test.c - tools/testing/selftests/kvm/vfio_pci_device_irq_test.c Future Areas of Development ----------------------------------------------------------------------- Library: - Driver support for devices that can be used on AMD, ARM, and other platforms (e.g. mlx5). - Driver support for a device available in QEMU VMs (e.g. pcie-ats-testdev [1]) - Support for tests that use multiple devices. - Support for IOMMU groups with multiple devices. - Support for multiple devices sharing the same container/iommufd. - Sharing TEST_ASSERT() macros and other common code between KVM and VFIO selftests. Tests: - DMA mapping performance tests for BARs/HugeTLB/etc. - Porting tests from https://github.com/awilliam/tests/commits/for-clg/ to selftests. - Live Update selftests. - Porting Sean's KVM selftest for posted interrupts to use the VFIO selftests library [2] Cc: Alex Williamson <alex.williamson(a)redhat.com> Cc: Jason Gunthorpe <jgg(a)nvidia.com> Cc: Kevin Tian <kevin.tian(a)intel.com> Cc: Paolo Bonzini <pbonzini(a)redhat.com> Cc: Sean Christopherson <seanjc(a)google.com> Cc: Vipin Sharma <vipinsh(a)google.com> Cc: Josh Hilke <jrhilke(a)google.com> Cc: Aaron Lewis <aaronlewis(a)google.com> Cc: Pasha Tatashin <pasha.tatashin(a)soleen.com> Cc: Saeed Mahameed <saeedm(a)nvidia.com> Cc: Adithya Jayachandran <ajayachandra(a)nvidia.com> Cc: Joel Granados <joel.granados(a)kernel.org> [1] https://github.com/Joelgranados/qemu/blob/pcie-testdev/hw/misc/pcie-ats-tes… [2] https://lore.kernel.org/kvm/20250404193923.1413163-68-seanjc@google.com/ David Matlack (28): selftests: Create tools/testing/selftests/vfio vfio: selftests: Add a helper library for VFIO selftests vfio: selftests: Introduce vfio_pci_device_test tools headers: Add stub definition for __iomem tools headers: Import asm-generic MMIO helpers tools headers: Import x86 MMIO helper overrides tools headers: Import iosubmit_cmds512() tools headers: Add symlink to linux/pci_ids.h vfio: selftests: Keep track of DMA regions mapped into the device vfio: selftests: Enable asserting MSI eventfds not firing vfio: selftests: Add a helper for matching vendor+device IDs vfio: selftests: Add driver framework vfio: sefltests: Add vfio_pci_driver_test dmaengine: ioat: Move system_has_dca_enabled() to dma.h vfio: selftests: Add driver for Intel CBDMA dmaengine: idxd: Allow registers.h to be included from tools/ vfio: selftests: Add driver for Intel DSA vfio: selftests: Move helper to get cdev path to libvfio vfio: selftests: Encapsulate IOMMU mode vfio: selftests: Replicate tests across all iommu_modes vfio: selftests: Add vfio_type1v2_mode vfio: selftests: Add iommufd_compat_type1{,v2} modes vfio: selftests: Add iommufd mode vfio: selftests: Make iommufd the default iommu_mode vfio: selftests: Add a script to help with running VFIO selftests KVM: selftests: Build and link sefltests/vfio/lib into KVM selftests KVM: selftests: Test sending a vfio-pci device IRQ to a VM KVM: selftests: Add -d option to vfio_pci_device_irq_test for device-sent MSIs Josh Hilke (5): vfio: selftests: Test basic VFIO and IOMMUFD integration vfio: selftests: Move vfio dma mapping test to their own file vfio: selftests: Add test to reset vfio device. vfio: selftests: Add DMA mapping tests for 2M and 1G HugeTLB vfio: selftests: Validate 2M/1G HugeTLB are mapped as 2M/1G in IOMMU MAINTAINERS | 7 + drivers/dma/idxd/registers.h | 4 + drivers/dma/ioat/dma.h | 2 + drivers/dma/ioat/hw.h | 3 - tools/arch/x86/include/asm/io.h | 101 +++ tools/arch/x86/include/asm/special_insns.h | 27 + tools/include/asm-generic/io.h | 482 ++++++++++++++ tools/include/asm/io.h | 11 + tools/include/linux/compiler.h | 4 + tools/include/linux/io.h | 4 +- tools/include/linux/pci_ids.h | 1 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/kvm/Makefile.kvm | 4 + .../testing/selftests/kvm/include/kvm_util.h | 4 + tools/testing/selftests/kvm/lib/kvm_util.c | 21 + .../selftests/kvm/vfio_pci_device_irq_test.c | 172 +++++ tools/testing/selftests/vfio/.gitignore | 7 + tools/testing/selftests/vfio/Makefile | 21 + .../selftests/vfio/lib/drivers/dsa/dsa.c | 416 ++++++++++++ .../vfio/lib/drivers/dsa/registers.h | 1 + .../selftests/vfio/lib/drivers/ioat/hw.h | 1 + .../selftests/vfio/lib/drivers/ioat/ioat.c | 235 +++++++ .../vfio/lib/drivers/ioat/registers.h | 1 + .../selftests/vfio/lib/include/vfio_util.h | 295 +++++++++ tools/testing/selftests/vfio/lib/libvfio.mk | 24 + .../selftests/vfio/lib/vfio_pci_device.c | 594 ++++++++++++++++++ .../selftests/vfio/lib/vfio_pci_driver.c | 126 ++++ tools/testing/selftests/vfio/run.sh | 109 ++++ .../selftests/vfio/vfio_dma_mapping_test.c | 199 ++++++ .../selftests/vfio/vfio_iommufd_setup_test.c | 127 ++++ .../selftests/vfio/vfio_pci_device_test.c | 176 ++++++ .../selftests/vfio/vfio_pci_driver_test.c | 247 ++++++++ 32 files changed, 3423 insertions(+), 4 deletions(-) create mode 100644 tools/arch/x86/include/asm/io.h create mode 100644 tools/arch/x86/include/asm/special_insns.h create mode 100644 tools/include/asm-generic/io.h create mode 100644 tools/include/asm/io.h create mode 120000 tools/include/linux/pci_ids.h create mode 100644 tools/testing/selftests/kvm/vfio_pci_device_irq_test.c create mode 100644 tools/testing/selftests/vfio/.gitignore create mode 100644 tools/testing/selftests/vfio/Makefile create mode 100644 tools/testing/selftests/vfio/lib/drivers/dsa/dsa.c create mode 120000 tools/testing/selftests/vfio/lib/drivers/dsa/registers.h create mode 120000 tools/testing/selftests/vfio/lib/drivers/ioat/hw.h create mode 100644 tools/testing/selftests/vfio/lib/drivers/ioat/ioat.c create mode 120000 tools/testing/selftests/vfio/lib/drivers/ioat/registers.h create mode 100644 tools/testing/selftests/vfio/lib/include/vfio_util.h create mode 100644 tools/testing/selftests/vfio/lib/libvfio.mk create mode 100644 tools/testing/selftests/vfio/lib/vfio_pci_device.c create mode 100644 tools/testing/selftests/vfio/lib/vfio_pci_driver.c create mode 100755 tools/testing/selftests/vfio/run.sh create mode 100644 tools/testing/selftests/vfio/vfio_dma_mapping_test.c create mode 100644 tools/testing/selftests/vfio/vfio_iommufd_setup_test.c create mode 100644 tools/testing/selftests/vfio/vfio_pci_device_test.c create mode 100644 tools/testing/selftests/vfio/vfio_pci_driver_test.c base-commit: e271ed52b344ac02d4581286961d0c40acc54c03 prerequisite-patch-id: c1decca4653262d3d2451e6fd4422ebff9c0b589 -- 2.50.0.rc2.701.gf1e915cc24-goog

2 weeks, 4 days

2
39
0 0

[PATCH net-next 6/6] selftests: net: extend SCM_PIDFD test to cover stale pidfds

by Alexander Mikhalitsyn

Extend SCM_PIDFD test scenarios to also cover dead task's pidfd retrieval and reading its exit info. Cc: linux-kselftest(a)vger.kernel.org Cc: linux-kernel(a)vger.kernel.org Cc: netdev(a)vger.kernel.org Cc: Shuah Khan <shuah(a)kernel.org> Cc: "David S. Miller" <davem(a)davemloft.net> Cc: Eric Dumazet <edumazet(a)google.com> Cc: Jakub Kicinski <kuba(a)kernel.org> Cc: Paolo Abeni <pabeni(a)redhat.com> Cc: Simon Horman <horms(a)kernel.org> Cc: Christian Brauner <brauner(a)kernel.org> Cc: Kuniyuki Iwashima <kuniyu(a)amazon.com> Cc: Lennart Poettering <mzxreary(a)0pointer.de> Cc: Luca Boccassi <bluca(a)debian.org> Cc: David Rheinsberg <david(a)readahead.eu> Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn(a)canonical.com> --- .../testing/selftests/net/af_unix/scm_pidfd.c | 217 ++++++++++++++---- 1 file changed, 173 insertions(+), 44 deletions(-) diff --git a/tools/testing/selftests/net/af_unix/scm_pidfd.c b/tools/testing/selftests/net/af_unix/scm_pidfd.c index 7e534594167e..37e034874034 100644 --- a/tools/testing/selftests/net/af_unix/scm_pidfd.c +++ b/tools/testing/selftests/net/af_unix/scm_pidfd.c @@ -15,6 +15,7 @@ #include <sys/types.h> #include <sys/wait.h> +#include "../../pidfd/pidfd.h" #include "../../kselftest_harness.h" #define clean_errno() (errno == 0 ? "None" : strerror(errno)) @@ -26,6 +27,8 @@ #define SCM_PIDFD 0x04 #endif +#define CHILD_EXIT_CODE_OK 123 + static void child_die() { exit(1); @@ -126,16 +129,65 @@ static pid_t get_pid_from_fdinfo_file(int pidfd, const char *key, size_t keylen) return result; } +struct cmsg_data { + struct ucred *ucred; + int *pidfd; +}; + +static int parse_cmsg(struct msghdr *msg, struct cmsg_data *res) +{ + struct cmsghdr *cmsg; + int data = 0; + + if (msg->msg_flags & (MSG_TRUNC | MSG_CTRUNC)) { + log_err("recvmsg: truncated"); + return 1; + } + + for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; + cmsg = CMSG_NXTHDR(msg, cmsg)) { + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_PIDFD) { + if (cmsg->cmsg_len < sizeof(*res->pidfd)) { + log_err("CMSG parse: SCM_PIDFD wrong len"); + return 1; + } + + res->pidfd = (void *)CMSG_DATA(cmsg); + } + + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_CREDENTIALS) { + if (cmsg->cmsg_len < sizeof(*res->ucred)) { + log_err("CMSG parse: SCM_CREDENTIALS wrong len"); + return 1; + } + + res->ucred = (void *)CMSG_DATA(cmsg); + } + } + + if (!res->pidfd) { + log_err("CMSG parse: SCM_PIDFD not found"); + return 1; + } + + if (!res->ucred) { + log_err("CMSG parse: SCM_CREDENTIALS not found"); + return 1; + } + + return 0; +} + static int cmsg_check(int fd) { struct msghdr msg = { 0 }; - struct cmsghdr *cmsg; + struct cmsg_data res; struct iovec iov; - struct ucred *ucred = NULL; int data = 0; char control[CMSG_SPACE(sizeof(struct ucred)) + CMSG_SPACE(sizeof(int))] = { 0 }; - int *pidfd = NULL; pid_t parent_pid; int err; @@ -158,53 +210,99 @@ static int cmsg_check(int fd) return 1; } - for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; - cmsg = CMSG_NXTHDR(&msg, cmsg)) { - if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_PIDFD) { - if (cmsg->cmsg_len < sizeof(*pidfd)) { - log_err("CMSG parse: SCM_PIDFD wrong len"); - return 1; - } + /* send(pfd, "x", sizeof(char), 0) */ + if (data != 'x') { + log_err("recvmsg: data corruption"); + return 1; + } - pidfd = (void *)CMSG_DATA(cmsg); - } + if (parse_cmsg(&msg, &res)) { + log_err("CMSG parse: parse_cmsg() failed"); + return 1; + } - if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_CREDENTIALS) { - if (cmsg->cmsg_len < sizeof(*ucred)) { - log_err("CMSG parse: SCM_CREDENTIALS wrong len"); - return 1; - } + /* pidfd from SCM_PIDFD should point to the parent process PID */ + parent_pid = + get_pid_from_fdinfo_file(*res.pidfd, "Pid:", sizeof("Pid:") - 1); + if (parent_pid != getppid()) { + log_err("wrong SCM_PIDFD %d != %d", parent_pid, getppid()); + close(*res.pidfd); + return 1; + } - ucred = (void *)CMSG_DATA(cmsg); - } + close(*res.pidfd); + return 0; +} + +static int cmsg_check_dead(int fd, int expected_pid) +{ + int err; + struct msghdr msg = { 0 }; + struct cmsg_data res; + struct iovec iov; + int data = 0; + char control[CMSG_SPACE(sizeof(struct ucred)) + + CMSG_SPACE(sizeof(int))] = { 0 }; + pid_t client_pid; + struct pidfd_info info = { + .mask = PIDFD_INFO_EXIT, + }; + + iov.iov_base = &data; + iov.iov_len = sizeof(data); + + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = control; + msg.msg_controllen = sizeof(control); + + err = recvmsg(fd, &msg, 0); + if (err < 0) { + log_err("recvmsg"); + return 1; } - /* send(pfd, "x", sizeof(char), 0) */ - if (data != 'x') { + if (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) { + log_err("recvmsg: truncated"); + return 1; + } + + /* send(cfd, "y", sizeof(char), 0) */ + if (data != 'y') { log_err("recvmsg: data corruption"); return 1; } - if (!pidfd) { - log_err("CMSG parse: SCM_PIDFD not found"); + if (parse_cmsg(&msg, &res)) { + log_err("CMSG parse: parse_cmsg() failed"); return 1; } - if (!ucred) { - log_err("CMSG parse: SCM_CREDENTIALS not found"); + /* + * pidfd from SCM_PIDFD should point to the client_pid. + * Let's read exit information and check if it's what + * we expect to see. + */ + if (ioctl(*res.pidfd, PIDFD_GET_INFO, &info)) { + log_err("%s: ioctl(PIDFD_GET_INFO) failed", __func__); + close(*res.pidfd); return 1; } - /* pidfd from SCM_PIDFD should point to the parent process PID */ - parent_pid = - get_pid_from_fdinfo_file(*pidfd, "Pid:", sizeof("Pid:") - 1); - if (parent_pid != getppid()) { - log_err("wrong SCM_PIDFD %d != %d", parent_pid, getppid()); + if (!(info.mask & PIDFD_INFO_EXIT)) { + log_err("%s: No exit information from ioctl(PIDFD_GET_INFO)", __func__); + close(*res.pidfd); return 1; } + err = WIFEXITED(info.exit_code) ? WEXITSTATUS(info.exit_code) : 1; + if (err != CHILD_EXIT_CODE_OK) { + log_err("%s: wrong exit_code %d != %d", __func__, err, CHILD_EXIT_CODE_OK); + close(*res.pidfd); + return 1; + } + + close(*res.pidfd); return 0; } @@ -291,6 +389,24 @@ static void fill_sockaddr(struct sock_addr *addr, bool abstract) memcpy(sun_path_buf, addr->sock_name, strlen(addr->sock_name)); } +static int sk_enable_cred_pass(int sk) +{ + int on = 0; + + on = 1; + if (setsockopt(sk, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on))) { + log_err("Failed to set SO_PASSCRED"); + return 1; + } + + if (setsockopt(sk, SOL_SOCKET, SO_PASSPIDFD, &on, sizeof(on))) { + log_err("Failed to set SO_PASSPIDFD"); + return 1; + } + + return 0; +} + static void client(FIXTURE_DATA(scm_pidfd) *self, const FIXTURE_VARIANT(scm_pidfd) *variant) { @@ -299,7 +415,6 @@ static void client(FIXTURE_DATA(scm_pidfd) *self, struct ucred peer_cred; int peer_pidfd; pid_t peer_pid; - int on = 0; cfd = socket(AF_UNIX, variant->type, 0); if (cfd < 0) { @@ -322,14 +437,8 @@ static void client(FIXTURE_DATA(scm_pidfd) *self, child_die(); } - on = 1; - if (setsockopt(cfd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on))) { - log_err("Failed to set SO_PASSCRED"); - child_die(); - } - - if (setsockopt(cfd, SOL_SOCKET, SO_PASSPIDFD, &on, sizeof(on))) { - log_err("Failed to set SO_PASSPIDFD"); + if (sk_enable_cred_pass(cfd)) { + log_err("sk_enable_cred_pass() failed"); child_die(); } @@ -340,6 +449,12 @@ static void client(FIXTURE_DATA(scm_pidfd) *self, child_die(); } + /* send something to the parent so it can receive SCM_PIDFD too and validate it */ + if (send(cfd, "y", sizeof(char), 0) == -1) { + log_err("Failed to send(cfd, \"y\", sizeof(char), 0)"); + child_die(); + } + /* skip further for SOCK_DGRAM as it's not applicable */ if (variant->type == SOCK_DGRAM) return; @@ -398,7 +513,13 @@ TEST_F(scm_pidfd, test) close(self->server); close(self->startup_pipe[0]); client(self, variant); - exit(0); + + /* + * It's a bit unusual, but in case of success we return non-zero + * exit code (CHILD_EXIT_CODE_OK) and then we expect to read it + * from ioctl(PIDFD_GET_INFO) in cmsg_check_dead(). + */ + exit(CHILD_EXIT_CODE_OK); } close(self->startup_pipe[1]); @@ -421,9 +542,17 @@ TEST_F(scm_pidfd, test) ASSERT_NE(-1, err); } - close(pfd); waitpid(self->client_pid, &child_status, 0); - ASSERT_EQ(0, WIFEXITED(child_status) ? WEXITSTATUS(child_status) : 1); + /* see comment before exit(CHILD_EXIT_CODE_OK) */ + ASSERT_EQ(CHILD_EXIT_CODE_OK, WIFEXITED(child_status) ? WEXITSTATUS(child_status) : 1); + + err = sk_enable_cred_pass(pfd); + ASSERT_EQ(0, err); + + err = cmsg_check_dead(pfd, self->client_pid); + ASSERT_EQ(0, err); + + close(pfd); } TEST_HARNESS_MAIN -- 2.43.0

2 weeks, 5 days

1
0
0 0

[RFC PATCH v8 0/7] Add NUMA mempolicy support for KVM guest-memfd

by Shivank Garg

This series introduces NUMA-aware memory placement support for KVM guests with guest_memfd memory backends. It builds upon Fuad Tabba's work that enabled host-mapping for guest_memfd memory [1] and can be applied directly on KVM tree (branch:queue, base commit:7915077245) [2]. == Background == KVM's guest-memfd memory backend currently lacks support for NUMA policy enforcement, causing guest memory allocations to be distributed across host nodes according to kernel's default behavior, irrespective of any policy specified by the VMM. This limitation arises because conventional userspace NUMA control mechanisms like mbind(2) don't work since the memory isn't directly mapped to userspace when allocations occur. Fuad's work [1] provides the necessary mmap capability, and this series leverages it to enable mbind(2). == Implementation == This series implements proper NUMA policy support for guest-memfd by: 1. Adding mempolicy-aware allocation APIs to the filemap layer. 2. Introducing custom inodes (via a dedicated slab-allocated inode cache, kvm_gmem_inode_info) to store NUMA policy and metadata for guest memory. 3. Implementing get/set_policy vm_ops in guest_memfd to support NUMA policy. With these changes, VMMs can now control guest memory placement by mapping guest_memfd file descriptor and using mbind(2) to specify: - Policy modes: default, bind, interleave, or preferred - Host NUMA nodes: List of target nodes for memory allocation These Policies affect only future allocations and do not migrate existing memory. This matches mbind(2)'s default behavior which affects only new allocations unless overridden with MPOL_MF_MOVE/MPOL_MF_MOVE_ALL flags (Not supported for guest_memfd as it is unmovable by design). == Upstream Plan == Phased approach as per David's guest_memfd extension overview [3] and community calls [4]: Phase 1 (this series): 1. Focuses on shared guest_memfd support (non-CoCo VMs). 2. Builds on Fuad's host-mapping work. Phase2 (future work): 1. NUMA support for private guest_memfd (CoCo VMs). 2. Depends on SNP in-place conversion support [5]. This series provides a clean integration path for NUMA-aware memory management for guest_memfd and lays the groundwork for future confidential computing NUMA capabilities. Please review and provide feedback! Thanks, Shivank == Changelog == - v1,v2: Extended the KVM_CREATE_GUEST_MEMFD IOCTL to pass mempolicy. - v3: Introduced fbind() syscall for VMM memory-placement configuration. - v4-v6: Current approach using shared_policy support and vm_ops (based on suggestions from David [6] and guest_memfd bi-weekly upstream call discussion [7]). - v7: Use inodes to store NUMA policy instead of file [8]. - v8: Rebase on top of Fuad's V12: Host mmaping for guest_memfd memory. [1] https://lore.kernel.org/all/20250611133330.1514028-1-tabba@google.com [2] https://git.kernel.org/pub/scm/virt/kvm/kvm.git/log/?h=queue [3] https://lore.kernel.org/all/c1c9591d-218a-495c-957b-ba356c8f8e09@redhat.com [4] https://docs.google.com/document/d/1M6766BzdY1Lhk7LiR5IqVR8B8mG3cr-cxTxOrAo… [5] https://lore.kernel.org/all/20250613005400.3694904-1-michael.roth@amd.com [6] https://lore.kernel.org/all/6fbef654-36e2-4be5-906e-2a648a845278@redhat.com [7] https://lore.kernel.org/all/2b77e055-98ac-43a1-a7ad-9f9065d7f38f@amd.com [8] https://lore.kernel.org/all/diqzbjumm167.fsf@ackerleytng-ctop.c.googlers.com Ackerley Tng (1): KVM: guest_memfd: Use guest mem inodes instead of anonymous inodes Shivank Garg (5): security: Export anon_inode_make_secure_inode for KVM guest_memfd mm/mempolicy: Export memory policy symbols KVM: guest_memfd: Add slab-allocated inode cache KVM: guest_memfd: Enforce NUMA mempolicy using shared policy KVM: guest_memfd: selftests: Add tests for mmap and NUMA policy support Shivansh Dhiman (1): mm/filemap: Add mempolicy support to the filemap layer fs/anon_inodes.c | 20 +- include/linux/fs.h | 2 + include/linux/pagemap.h | 41 +++ include/uapi/linux/magic.h | 1 + mm/filemap.c | 27 +- mm/mempolicy.c | 6 + tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/guest_memfd_test.c | 123 ++++++++- virt/kvm/guest_memfd.c | 254 ++++++++++++++++-- virt/kvm/kvm_main.c | 7 +- virt/kvm/kvm_mm.h | 10 +- 11 files changed, 456 insertions(+), 36 deletions(-) -- 2.43.0 --- == Earlier Postings == v7: https://lore.kernel.org/all/20250408112402.181574-1-shivankg@amd.com v6: https://lore.kernel.org/all/20250226082549.6034-1-shivankg@amd.com v5: https://lore.kernel.org/all/20250219101559.414878-1-shivankg@amd.com v4: https://lore.kernel.org/all/20250210063227.41125-1-shivankg@amd.com v3: https://lore.kernel.org/all/20241105164549.154700-1-shivankg@amd.com v2: https://lore.kernel.org/all/20240919094438.10987-1-shivankg@amd.com v1: https://lore.kernel.org/all/20240916165743.201087-1-shivankg@amd.com

2 weeks, 5 days

8
33
0 0

[PATCH v3 0/3] replace `allow(...)` lints with `expect(...)`

by Onur Özkan

Changes in v3: - `#![expect(internal_features)]` is reverted from `rust/compiler_builtins.rs` which was done in the first 2 versions. Onur Özkan (3): replace `#[allow(...)]` with `#[expect(...)]` rust: remove `#[allow(clippy::unnecessary_cast)]` rust: remove `#[allow(clippy::non_send_fields_in_send_ty)]` drivers/gpu/nova-core/regs.rs | 2 +- rust/kernel/alloc/allocator_test.rs | 2 +- rust/kernel/cpufreq.rs | 1 - rust/kernel/devres.rs | 2 +- rust/kernel/driver.rs | 2 +- rust/kernel/drm/ioctl.rs | 8 ++++---- rust/kernel/error.rs | 3 +-- rust/kernel/init.rs | 6 +++--- rust/kernel/kunit.rs | 2 +- rust/kernel/opp.rs | 4 ++-- rust/kernel/types.rs | 2 +- rust/macros/helpers.rs | 2 +- 12 files changed, 17 insertions(+), 19 deletions(-) -- 2.50.0

2 weeks, 5 days

4
15
0 0

[PATCH 0/6] selftests/damon: add python and drgn based DAMON sysfs functionality tests

by SeongJae Park

DAMON sysfs interface is the bridge between the user space and the kernel space for DAMON parameters. There is no good and simple test to see if the parameters are set as expected. Existing DAMON selftests therefore test end-to-end features. For example, damos_quota_goal.py runs a DAMOS scheme with quota goal set against a test program running an artificial access pattern, and see if the result is as expected. Such tests cover only a few part of DAMON. Adding more tests is also complicated. Finally, the reliability of the test itself on different systems is bad. 'drgn' is a tool that can extract kernel internal data structures like DAMON parameters. Add a test that passes specific DAMON parameters via DAMON sysfs reusing _damon_sysfs.py, extract resulting DAMON parameters via 'drgn', and compare those. Note that this test is not adding exhaustive tests of all DAMON parameters and input combinations but very basic things. Advancing the test infrastructure and adding more tests are future works. Changes from RFC (https://lore.kernel.org/20250622210330.40490-1-sj@kernel.org) - Rebase on latest mm-new SeongJae Park (6): selftests/damon: add drgn script for extracting damon status selftests/damon/_damon_sysfs: set Kdamond.pid in start() selftests/damon: add python and drgn-based DAMON sysfs test selftests/damon/sysfs.py: test monitoring attribute parameters selftests/damon/sysfs.py: test adaptive targets parameter selftests/damon/sysfs.py: test DAMOS schemes parameters setup tools/testing/selftests/damon/Makefile | 1 + tools/testing/selftests/damon/_damon_sysfs.py | 3 + .../selftests/damon/drgn_dump_damon_status.py | 161 ++++++++++++++++++ tools/testing/selftests/damon/sysfs.py | 115 +++++++++++++ 4 files changed, 280 insertions(+) create mode 100755 tools/testing/selftests/damon/drgn_dump_damon_status.py create mode 100755 tools/testing/selftests/damon/sysfs.py base-commit: 5ab6feac2d83ebbf0d0d2eedf0505878ba677dcb -- 2.39.5

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