- Linux-kselftest-mirror - lists.linaro.org

[PATCHv4 iproute2-next] iplink: bond_slave: add support for actor_port_prio

by Hangbin Liu

Add support for the actor_port_prio option for bond slaves. This per-port priority can be used by the bonding driver in ad_select to choose the higher-priority aggregator during failover. Signed-off-by: Hangbin Liu <liuhangbin(a)gmail.com> --- v4: no update v3: rename ad_actor_port_prio to actor_port_prio v2: no update --- ip/iplink_bond.c | 1 + ip/iplink_bond_slave.c | 18 ++++++++++++++++-- man/man8/ip-link.8.in | 6 ++++++ 3 files changed, 23 insertions(+), 2 deletions(-) diff --git a/ip/iplink_bond.c b/ip/iplink_bond.c index d6960f6d9b03..1a2c1b3042a0 100644 --- a/ip/iplink_bond.c +++ b/ip/iplink_bond.c @@ -91,6 +91,7 @@ static const char *ad_select_tbl[] = { "stable", "bandwidth", "count", + "prio", NULL, }; diff --git a/ip/iplink_bond_slave.c b/ip/iplink_bond_slave.c index ad6875006950..c88100e248dd 100644 --- a/ip/iplink_bond_slave.c +++ b/ip/iplink_bond_slave.c @@ -15,7 +15,9 @@ static void print_explain(FILE *f) { - fprintf(f, "Usage: ... bond_slave [ queue_id ID ] [ prio PRIORITY ]\n"); + fprintf(f, "Usage: ... bond_slave [ queue_id ID ] [ prio PRIORITY ]\n" + " [ actor_port_prio PRIORITY ]\n" + ); } static void explain(void) @@ -145,12 +147,18 @@ static void bond_slave_print_opt(struct link_util *lu, FILE *f, struct rtattr *t state); print_slave_oper_state(f, "ad_partner_oper_port_state_str", state); } + + if (tb[IFLA_BOND_SLAVE_ACTOR_PORT_PRIO]) + print_int(PRINT_ANY, + "actor_port_prio", + "actor_port_prio %d ", + rta_getattr_u16(tb[IFLA_BOND_SLAVE_ACTOR_PORT_PRIO])); } static int bond_slave_parse_opt(struct link_util *lu, int argc, char **argv, struct nlmsghdr *n) { - __u16 queue_id; + __u16 queue_id, actor_port_prio; int prio; while (argc > 0) { @@ -164,6 +172,12 @@ static int bond_slave_parse_opt(struct link_util *lu, int argc, char **argv, if (get_s32(&prio, *argv, 0)) invarg("prio is invalid", *argv); addattr32(n, 1024, IFLA_BOND_SLAVE_PRIO, prio); + } else if (strcmp(*argv, "actor_port_prio") == 0) { + NEXT_ARG(); + if (get_u16(&actor_port_prio, *argv, 0)) + invarg("actor prio is invalid", *argv); + addattr16(n, 1024, IFLA_BOND_SLAVE_ACTOR_PORT_PRIO, + actor_port_prio); } else { if (matches(*argv, "help") != 0) fprintf(stderr, diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in index e3297c577152..7995943ab11f 100644 --- a/man/man8/ip-link.8.in +++ b/man/man8/ip-link.8.in @@ -2846,6 +2846,12 @@ the following additional arguments are supported: (a 32bit signed value). This option only valid for active-backup(1), balance-tlb (5) and balance-alb (6) mode. +.sp +.BI actor_port_prio " PRIORITY" +- set the slave's ad actor port priority for 802.3ad aggregation selection +logic during failover (a 16bit unsigned value). This option only valid for +802.3ad (4) mode. + .in -8 .TP -- 2.50.1

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[PATCH 1/9] KVM: selftests: Add pidfd_open syscall number fallback

by Aqib Faruqui

The kselftest-harness uses pidfd_open() for test timeout handling, but non-glibc C library headers may not define this syscall number. Add architecture-specific fallback definitions to pidfd.h, including support for Alpha (544) and other architectures (434). Update kselftest_harness.h to include pidfd.h for the syscall definitions. Signed-off-by: Aqib Faruqui <aqibaf(a)amazon.com> --- tools/testing/selftests/kselftest_harness.h | 1 + tools/testing/selftests/pidfd/pidfd.h | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h index 2925e47db..1dd3e5a1b 100644 --- a/tools/testing/selftests/kselftest_harness.h +++ b/tools/testing/selftests/kselftest_harness.h @@ -69,6 +69,7 @@ #include <unistd.h> #include "kselftest.h" +#include "pidfd/pidfd.h" #define TEST_TIMEOUT_DEFAULT 30 diff --git a/tools/testing/selftests/pidfd/pidfd.h b/tools/testing/selftests/pidfd/pidfd.h index f87993def..c373ff18e 100644 --- a/tools/testing/selftests/pidfd/pidfd.h +++ b/tools/testing/selftests/pidfd/pidfd.h @@ -45,8 +45,12 @@ #endif #ifndef __NR_pidfd_open +#ifdef __alpha__ +#define __NR_pidfd_open 544 +#else #define __NR_pidfd_open 434 #endif +#endif #ifndef __NR_pidfd_send_signal #define __NR_pidfd_send_signal 424 -- 2.47.3

1 day, 1 hour

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[PATCH v4 00/15] Consolidate iommu page table implementations (AMD)

by Jason Gunthorpe

[All the precursor patches are merged now and AMD/RISCV/VTD conversions are written] Currently each of the iommu page table formats duplicates all of the logic to maintain the page table and perform map/unmap/etc operations. There are several different versions of the algorithms between all the different formats. The io-pgtable system provides an interface to help isolate the page table code from the iommu driver, but doesn't provide tools to implement the common algorithms. This makes it very hard to improve the state of the pagetable code under the iommu domains as any proposed improvement needs to alter a large number of different driver code paths. Combined with a lack of software based testing this makes improvement in this area very hard. iommufd wants several new page table operations: - More efficient map/unmap operations, using iommufd's batching logic - unmap that returns the physical addresses into a batch as it progresses - cut that allows splitting areas so large pages can have holes poked in them dynamically (ie guestmemfd hitless shared/private transitions) - More agressive freeing of table memory to avoid waste - Fragmenting large pages so that dirty tracking can be more granular - Reassembling large pages so that VMs can run at full IO performance in migration/dirty tracking error flows - KHO integration for kernel live upgrade Together these are algorithmically complex enough to be a very significant task to go and implement in all the page table formats we support. Just the "server" focused drivers use almost all the formats (ARMv8 S1&S2 / x86 PAE / AMDv1 / VT-D SS / RISCV) Instead of doing the duplicated work, this series takes the first step to consolidate the algorithms into one places. In spirit it is similar to the work Christoph did a few years back to pull the redundant get_user_pages() implementations out of the arch code into core MM. This unlocked a great deal of improvement in that space in the following years. I would like to see the same benefit in iommu as well. My first RFC showed a bigger picture with all most all formats and more algorithms. This series reorganizes that to be narrowly focused on just enough to convert the AMD driver to use the new mechanism. kunit tests are provided that allow good testing of the algorithms and all formats on x86, nothing is arch specific. AMD is one of the simpler options as the HW is quite uniform with few different options/bugs while still requiring the complicated contiguous pages support. The HW also has a very simple range based invalidation approach that is easy to implement. The AMD v1 and AMD v2 page table formats are implemented bit for bit identical to the current code, tested using a compare kunit test that checks against the io-pgtable version (on github, see below). Updating the AMD driver to replace the io-pgtable layer with the new stuff is fairly straightforward now. The layering is fixed up in the new version so that all the invalidation goes through function pointers. Several small fixing patches have come out of this as I've been fixing the problems that the test suite uncovers in the current code, and implementing the fixed version in iommupt. On performance, there is a quite wide variety of implementation designs across all the drivers. Looking at some key performance across the main formats: iommu_map(): pgsz ,avg new,old ns, min new,old ns , min % (+ve is better) 2^12, 53,66 , 51,63 , 19.19 (AMDV1) 256*2^12, 386,1909 , 367,1795 , 79.79 256*2^21, 362,1633 , 355,1556 , 77.77 2^12, 56,62 , 52,59 , 11.11 (AMDv2) 256*2^12, 405,1355 , 357,1292 , 72.72 256*2^21, 393,1160 , 358,1114 , 67.67 2^12, 55,65 , 53,62 , 14.14 (VTD second stage) 256*2^12, 391,518 , 332,512 , 35.35 256*2^21, 383,635 , 336,624 , 46.46 2^12, 57,65 , 55,63 , 12.12 (ARM 64 bit) 256*2^12, 380,389 , 361,369 , 2.02 256*2^21, 358,419 , 345,400 , 13.13 iommu_unmap(): pgsz ,avg new,old ns, min new,old ns , min % (+ve is better) 2^12, 69,88 , 65,85 , 23.23 (AMDv1) 256*2^12, 353,6498 , 331,6029 , 94.94 256*2^21, 373,6014 , 360,5706 , 93.93 2^12, 71,72 , 66,69 , 4.04 (AMDv2) 256*2^12, 228,891 , 206,871 , 76.76 256*2^21, 254,721 , 245,711 , 65.65 2^12, 69,87 , 65,82 , 20.20 (VTD second stage) 256*2^12, 210,321 , 200,315 , 36.36 256*2^21, 255,349 , 238,342 , 30.30 2^12, 72,77 , 68,74 , 8.08 (ARM 64 bit) 256*2^12, 521,357 , 447,346 , -29.29 256*2^21, 489,358 , 433,345 , -25.25 * Above numbers include additional patches to remove the iommu_pgsize() overheads. gcc 13.3.0, i7-12700 This version provides fairly consistent performance across formats. ARM unmap performance is quite different because this version supports contiguous pages and uses a very different algorithm for unmapping. Though why it is so worse compared to AMDv1 I haven't figured out yet. The per-format commits include a more detailed chart. There is a second branch: https://github.com/jgunthorpe/linux/commits/iommu_pt_all Containing supporting work and future steps: - ARM short descriptor (32 bit), ARM long descriptor (64 bit) formats - RISCV format and RISCV conversion https://github.com/jgunthorpe/linux/commits/iommu_pt_riscv - Support for a DMA incoherent HW page table walker - VT-D second stage format and VT-D conversion https://github.com/jgunthorpe/linux/commits/iommu_pt_vtd - DART v1 & v2 format - Draft of a iommufd 'cut' operation to break down huge pages - A compare test that checks the iommupt formats against the iopgtable interface, including updating AMD to have a working iopgtable and patches to make VT-D have an iopgtable for testing. - A performance test to micro-benchmark map and unmap against iogptable My strategy is to go one by one for the drivers: - AMD driver conversion - RISCV page table and driver - Intel VT-D driver and VTDSS page table - Flushing improvements for RISCV - ARM SMMUv3 And concurrently work on the algorithm side: - debugfs content dump, like VT-D has - Cut support - Increase/Decrease page size support - map/unmap batching - KHO As we make more algorithm improvements the value to convert the drivers increases. This is on github: https://github.com/jgunthorpe/linux/commits/iommu_pt v3: - Rebase on v6.16-rc3 - Integrate the HATS/HATDis changes - Remove 'default n' from kconfig - Remove unused 'PT_FIXED_TOP_LEVEL' - Improve comments and coumentation - Fix some compile warnings from kbuild robots v2: https://patch.msgid.link/r/0-v3-a93aab628dbc+521-iommu_pt_jgg@nvidia.com - Rebase on v6.16-rc2 - s/PT_ENTRY_WORD_SIZE/PT_ITEM_WORD_SIZE/s to follow the language better - Comment and documentation updates - Add PT_TOP_PHYS_MASK to help manage alignment restrictions on the top pointer - Add missed force_aperture = true - Make pt_iommu_deinit() take care of the not-yet-inited error case internally as AMD/RISCV/VTD all shared this logic - Change gather_range() into gather_range_pages() so it also deals with the page list. This makes the following cache flushing series simpler - Fix missed update of unmap->unmapped in some error cases - Change clear_contig() to order the gather more logically - Remove goto from the error handling in __map_range_leaf() - s/log2_/oalog2_/ in places where the argument is an oaddr_t - Pass the pts to pt_table_install64/32() - Do not use SIGN_EXTEND for the AMDv2 page table because of Vasant's information on how PASID 0 works. v1: https://patch.msgid.link/r/0-v2-5c26bde5c22d+58b-iommu_pt_jgg@nvidia.com - AMD driver only, many code changes RFC: https://lore.kernel.org/all/0-v1-01fa10580981+1d-iommu_pt_jgg@nvidia.com/ Cc: Michael Roth <michael.roth(a)amd.com> Cc: Alexey Kardashevskiy <aik(a)amd.com> Cc: Pasha Tatashin <pasha.tatashin(a)soleen.com> Cc: James Gowans <jgowans(a)amazon.com> Signed-off-by: Jason Gunthorpe <jgg(a)nvidia.com> Alejandro Jimenez (1): iommu/amd: Use the generic iommu page table Jason Gunthorpe (14): genpt: Generic Page Table base API genpt: Add Documentation/ files iommupt: Add the basic structure of the iommu implementation iommupt: Add the AMD IOMMU v1 page table format iommupt: Add iova_to_phys op iommupt: Add unmap_pages op iommupt: Add map_pages op iommupt: Add read_and_clear_dirty op iommupt: Add a kunit test for Generic Page Table iommupt: Add a mock pagetable format for iommufd selftest to use iommufd: Change the selftest to use iommupt instead of xarray iommupt: Add the x86 64 bit page table format iommu/amd: Remove AMD io_pgtable support iommupt: Add a kunit test for the IOMMU implementation .clang-format | 1 + Documentation/driver-api/generic_pt.rst | 140 ++ Documentation/driver-api/index.rst | 1 + drivers/iommu/Kconfig | 2 + drivers/iommu/Makefile | 1 + drivers/iommu/amd/Kconfig | 5 +- drivers/iommu/amd/Makefile | 2 +- drivers/iommu/amd/amd_iommu.h | 1 - drivers/iommu/amd/amd_iommu_types.h | 109 +- drivers/iommu/amd/io_pgtable.c | 560 -------- drivers/iommu/amd/io_pgtable_v2.c | 370 ------ drivers/iommu/amd/iommu.c | 538 ++++---- drivers/iommu/generic_pt/.kunitconfig | 13 + drivers/iommu/generic_pt/Kconfig | 67 + drivers/iommu/generic_pt/fmt/Makefile | 26 + drivers/iommu/generic_pt/fmt/amdv1.h | 409 ++++++ drivers/iommu/generic_pt/fmt/defs_amdv1.h | 21 + drivers/iommu/generic_pt/fmt/defs_x86_64.h | 21 + drivers/iommu/generic_pt/fmt/iommu_amdv1.c | 15 + drivers/iommu/generic_pt/fmt/iommu_mock.c | 10 + drivers/iommu/generic_pt/fmt/iommu_template.h | 48 + drivers/iommu/generic_pt/fmt/iommu_x86_64.c | 11 + drivers/iommu/generic_pt/fmt/x86_64.h | 248 ++++ drivers/iommu/generic_pt/iommu_pt.h | 1146 +++++++++++++++++ drivers/iommu/generic_pt/kunit_generic_pt.h | 717 +++++++++++ drivers/iommu/generic_pt/kunit_iommu.h | 183 +++ drivers/iommu/generic_pt/kunit_iommu_pt.h | 451 +++++++ drivers/iommu/generic_pt/pt_common.h | 354 +++++ drivers/iommu/generic_pt/pt_defs.h | 323 +++++ drivers/iommu/generic_pt/pt_fmt_defaults.h | 193 +++ drivers/iommu/generic_pt/pt_iter.h | 636 +++++++++ drivers/iommu/generic_pt/pt_log2.h | 130 ++ drivers/iommu/io-pgtable.c | 4 - drivers/iommu/iommufd/Kconfig | 1 + drivers/iommu/iommufd/iommufd_test.h | 11 +- drivers/iommu/iommufd/selftest.c | 438 +++---- include/linux/generic_pt/common.h | 166 +++ include/linux/generic_pt/iommu.h | 270 ++++ include/linux/io-pgtable.h | 2 - tools/testing/selftests/iommu/iommufd.c | 60 +- tools/testing/selftests/iommu/iommufd_utils.h | 12 + 41 files changed, 6124 insertions(+), 1592 deletions(-) create mode 100644 Documentation/driver-api/generic_pt.rst delete mode 100644 drivers/iommu/amd/io_pgtable.c delete mode 100644 drivers/iommu/amd/io_pgtable_v2.c create mode 100644 drivers/iommu/generic_pt/.kunitconfig create mode 100644 drivers/iommu/generic_pt/Kconfig create mode 100644 drivers/iommu/generic_pt/fmt/Makefile create mode 100644 drivers/iommu/generic_pt/fmt/amdv1.h create mode 100644 drivers/iommu/generic_pt/fmt/defs_amdv1.h create mode 100644 drivers/iommu/generic_pt/fmt/defs_x86_64.h create mode 100644 drivers/iommu/generic_pt/fmt/iommu_amdv1.c create mode 100644 drivers/iommu/generic_pt/fmt/iommu_mock.c create mode 100644 drivers/iommu/generic_pt/fmt/iommu_template.h create mode 100644 drivers/iommu/generic_pt/fmt/iommu_x86_64.c create mode 100644 drivers/iommu/generic_pt/fmt/x86_64.h create mode 100644 drivers/iommu/generic_pt/iommu_pt.h create mode 100644 drivers/iommu/generic_pt/kunit_generic_pt.h create mode 100644 drivers/iommu/generic_pt/kunit_iommu.h create mode 100644 drivers/iommu/generic_pt/kunit_iommu_pt.h create mode 100644 drivers/iommu/generic_pt/pt_common.h create mode 100644 drivers/iommu/generic_pt/pt_defs.h create mode 100644 drivers/iommu/generic_pt/pt_fmt_defaults.h create mode 100644 drivers/iommu/generic_pt/pt_iter.h create mode 100644 drivers/iommu/generic_pt/pt_log2.h create mode 100644 include/linux/generic_pt/common.h create mode 100644 include/linux/generic_pt/iommu.h base-commit: 8da0d63bd5726ff656bfa1eacb45d6f5cce65616 -- 2.43.0

1 day, 1 hour

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[PATCH 2/9] KVM: selftests: Add __packed attribute fallback

by Aqib Faruqui

Kernel UAPI headers use __packed but don't provide the definition in userspace builds. Add a fallback definition matching the kernel's implementation. This follows the same pattern used by BPF and SGX selftests. Signed-off-by: Aqib Faruqui <aqibaf(a)amazon.com> --- tools/testing/selftests/kvm/include/kvm_util.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 23a506d7e..7fae7f5e7 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -5,6 +5,10 @@ #ifndef SELFTEST_KVM_UTIL_H #define SELFTEST_KVM_UTIL_H +#ifndef __packed +#define __packed __attribute__((__packed__)) +#endif + #include "test_util.h" #include <linux/compiler.h> -- 2.47.3

1 day, 1 hour

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[PATCH 3/9] KVM: selftests: Add pthread_attr_setaffinity_np fallback

by Aqib Faruqui

The pthread_attr_setaffinity_np function is a GNU extension that may not be available in non-glibc C libraries. Some KVM selftests use this function for CPU affinity control. Add a function declaration and weak stub implementation for non-glibc builds. This allows tests to build, with the affinity setting being a no-op and errno set for the caller when the actual function is not available. Signed-off-by: Aqib Faruqui <aqibaf(a)amazon.com> --- tools/testing/selftests/kvm/include/kvm_util.h | 4 ++++ tools/testing/selftests/kvm/lib/kvm_util.c | 11 +++++++++++ 2 files changed, 15 insertions(+) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 7fae7f5e7..8177178b5 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -31,6 +31,10 @@ #include "kvm_util_types.h" #include "sparsebit.h" +#ifndef __GLIBC__ +int pthread_attr_setaffinity_np(pthread_attr_t *attr, size_t cpusetsize, const cpu_set_t *cpuset); +#endif /* __GLIBC__ */ + #define KVM_DEV_PATH "/dev/kvm" #define KVM_MAX_VCPUS 512 diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index c3f5142b0..5ce80303d 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -20,6 +20,17 @@ #define KVM_UTIL_MIN_PFN 2 +#ifndef __GLIBC__ +int __attribute__((weak)) +pthread_attr_setaffinity_np(pthread_attr_t *__attr, + size_t __cpusetsize, + const cpu_set_t *__cpuset) +{ + errno = ENOSYS; + return -1; +} +#endif + uint32_t guest_random_seed; struct guest_random_state guest_rng; static uint32_t last_guest_seed; -- 2.47.3

1 day, 1 hour

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[PATCH net-next 1/2] selftests: drv-net: rss_ctx: use Netlink for timed reconfig

by Jakub Kicinski

The rss_ctx test has gotten pretty flaky after I increased the queue count in NIPA 2->3. Not 100% clear why. We get a lot of failures in the rss_ctx.test_hitless_key_update case. Looking closer it appears that the failures are mostly due to startup costs. I measured the following timing for ethtool -X: - python cmd(shell=True) : 150-250msec - python cmd(shell=False) : 50- 70msec - timed in bash : 45- 55msec - YNL Netlink call : 2- 4msec - .set_rxfh callback : 1- 2msec The target in the test was set to 200msec. We were mostly measuring ethtool startup cost it seems. Switch to YNL since it's 100x faster. Lower the pass criteria to ~75msec, no real science behind this number but we removed ~150msec of overhead, and the old target was 200msec. So any driver that was passing previously should still pass with 75msec. Separately we should probably follow up on defaulting to shell=False, when script doesn't explicitly ask for True, because the overhead is rather significant. Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- tools/testing/selftests/drivers/net/hw/rss_ctx.py | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/drivers/net/hw/rss_ctx.py b/tools/testing/selftests/drivers/net/hw/rss_ctx.py index 9838b8457e5a..3fc5688605b5 100755 --- a/tools/testing/selftests/drivers/net/hw/rss_ctx.py +++ b/tools/testing/selftests/drivers/net/hw/rss_ctx.py @@ -335,19 +335,20 @@ from lib.py import ethtool, ip, defer, GenerateTraffic, CmdExitFailure data = get_rss(cfg) key_len = len(data['rss-hash-key']) - key = _rss_key_rand(key_len) + ethnl = EthtoolFamily() + key = random.randbytes(key_len) tgen = GenerateTraffic(cfg) try: errors0, carrier0 = get_drop_err_sum(cfg) t0 = datetime.datetime.now() - ethtool(f"-X {cfg.ifname} hkey " + _rss_key_str(key)) + ethnl.rss_set({"header": {"dev-index": cfg.ifindex}, "hkey": key}) t1 = datetime.datetime.now() errors1, carrier1 = get_drop_err_sum(cfg) finally: tgen.wait_pkts_and_stop(5000) - ksft_lt((t1 - t0).total_seconds(), 0.2) + ksft_lt((t1 - t0).total_seconds(), 0.075) ksft_eq(errors1 - errors1, 0) ksft_eq(carrier1 - carrier0, 0) -- 2.51.0

1 day, 2 hours

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[PATCH 5/9] KVM: selftests: Prevent PAGE_SIZE redefinition on x86

by Aqib Faruqui

Prevent PAGE_SIZE redefinition warnings that can occur due to namespace pollution from included headers. Add an #ifndef directive before defining PAGE_SIZE to avoid redefinition conflicts. Signed-off-by: Aqib Faruqui <aqibaf(a)amazon.com> --- tools/testing/selftests/kvm/include/x86/processor.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/kvm/include/x86/processor.h b/tools/testing/selftests/kvm/include/x86/processor.h index 2efb05c2f..3f93d1b4f 100644 --- a/tools/testing/selftests/kvm/include/x86/processor.h +++ b/tools/testing/selftests/kvm/include/x86/processor.h @@ -368,7 +368,9 @@ static inline unsigned int x86_model(unsigned int eax) #define PHYSICAL_PAGE_MASK GENMASK_ULL(51, 12) #define PAGE_SHIFT 12 +#ifndef PAGE_SIZE #define PAGE_SIZE (1ULL << PAGE_SHIFT) +#endif #define PAGE_MASK (~(PAGE_SIZE-1) & PHYSICAL_PAGE_MASK) #define HUGEPAGE_SHIFT(x) (PAGE_SHIFT + (((x) - 1) * 9)) -- 2.47.3

1 day, 3 hours

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[PATCHSET V1 0/2] cpuidle, bpf: Introduce BPF-based extensible cpuidle policy via struct_ops

by Lin Yikai

Summary ---------- Hi, everyone, This patch set introduces an extensible cpuidle governor framework using BPF struct_ops, enabling dynamic implementation of idle-state selection policies via BPF programs. Motivation ---------- As is well-known, CPUs support multiple idle states (e.g., C0, C1, C2, ...), where deeper states reduce power consumption, but results in longer wakeup latency, potentially affecting performance. Existing generic cpuidle governors operate effectively in common scenarios but exhibit suboptimal behavior in specific Android phone's use cases. Our testing reveals that during low-utilization scenarios (e.g., screen-off background tasks like music playback with CPU utilization <10%), the C0 state occupies ~50% of idle time, causing significant energy inefficiency. Reducing C0 to ≤20% could yield ≥5% power savings on mobile phones. To address this, we expect: 1.Dynamic governor switching to power-saved policies for low cpu utilization scenarios (e.g., screen-off mode) 2.Dynamic switching to alternate governors for high-performance scenarios (e.g., gaming) OverView ---------- The BPF cpuidle ext governor registers at postcore_initcall() but remains disabled by default due to its low priority "rating" with value "1". Activation requires adjust higer "rating" than other governors within BPF. Core Components: 1.**struct cpuidle_gov_ext_ops** – BPF-overridable operations: - ops.enable()/ops.disable(): enable or disable callback - ops.select(): cpu Idle-state selection logic - ops.set_stop_tick(): Scheduler tick management after state selection - ops.reflect(): feedback info about previous idle state. - ops.init()/ops.deinit(): Initialization or cleanup. 2.**Critical kfuncs for kernel state access**: - bpf_cpuidle_ext_gov_update_rating(): Activate ext governor by raising rating must be called from "ops.init()" - bpf_cpuidle_ext_gov_latency_req(): get idle-state latency constraints - bpf_tick_nohz_get_sleep_length(): get CPU sleep duration in tickless mode Future work ---------- 1. Scenario detection: Identifying low-utilization states (e.g., screen-off + background music) 2. Policy optimization: Optimizing state-selection algorithms for specific scenarios Lin Yikai (2): Subject: [PATCH v1 1/2] cpuidle: Implement BPF extensible cpuidle class Subject: [PATCH v1 2/2] selftests/bpf: Add selftests drivers/cpuidle/Kconfig | 12 + drivers/cpuidle/governors/Makefile | 1 + drivers/cpuidle/governors/ext.c | 537 ++++++++++++++++++ .../bpf/prog_tests/test_cpuidle_gov_ext.c | 28 + .../selftests/bpf/progs/cpuidle_gov_ext.c | 208 +++++++ 5 files changed, 786 insertions(+) create mode 100644 drivers/cpuidle/governors/ext.c create mode 100644 tools/testing/selftests/bpf/prog_tests/test_cpuidle_gov_ext.c create mode 100644 tools/testing/selftests/bpf/progs/cpuidle_gov_ext.c -- 2.43.0

1 day, 4 hours

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[PATCH] selftests/bpf: Fix count write in testapp_xdp_metadata_copy()

by Ricardo B. Marlière

Commit 4b302092553c ("selftests/xsk: Add tail adjustment tests and support check") added a new global to xsk_xdp_progs.c, but left out the access in the testapp_xdp_metadata_copy() function. Since bpf_map_update_elem() will write to the whole bss section, it gets truncated. Fix by writing to skel_rx->bss->count directly. Fixes: 4b302092553c ("selftests/xsk: Add tail adjustment tests and support check") Signed-off-by: Ricardo B. Marlière <rbm(a)suse.com> --- tools/testing/selftests/bpf/xskxceiver.c | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-) diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c index a29de0713f19f05ef49a52e3824bb58a30565e87..352adc8df2d1cd777c823c5a89f1720ee043f342 100644 --- a/tools/testing/selftests/bpf/xskxceiver.c +++ b/tools/testing/selftests/bpf/xskxceiver.c @@ -2276,25 +2276,13 @@ static int testapp_xdp_metadata_copy(struct test_spec *test) { struct xsk_xdp_progs *skel_rx = test->ifobj_rx->xdp_progs; struct xsk_xdp_progs *skel_tx = test->ifobj_tx->xdp_progs; - struct bpf_map *data_map; - int count = 0; - int key = 0; test_spec_set_xdp_prog(test, skel_rx->progs.xsk_xdp_populate_metadata, skel_tx->progs.xsk_xdp_populate_metadata, skel_rx->maps.xsk, skel_tx->maps.xsk); test->ifobj_rx->use_metadata = true; - data_map = bpf_object__find_map_by_name(skel_rx->obj, "xsk_xdp_.bss"); - if (!data_map || !bpf_map__is_internal(data_map)) { - ksft_print_msg("Error: could not find bss section of XDP program\n"); - return TEST_FAILURE; - } - - if (bpf_map_update_elem(bpf_map__fd(data_map), &key, &count, BPF_ANY)) { - ksft_print_msg("Error: could not update count element\n"); - return TEST_FAILURE; - } + skel_rx->bss->count = 0; return testapp_validate_traffic(test); } --- base-commit: 5b6d6fe1ca7b712c74f78426bb23c465fd34b322 change-id: 20250829-selftests-bpf-xsk_regression_fix-674d292e4d2a Best regards, -- Ricardo B. Marlière <rbm(a)suse.com>

1 day, 4 hours

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[PATCH bpf-next v5 0/2] Fix bpf_strnstr len error

by Rong Tao

From: Rong Tao <rongtao(a)cestc.cn> Fix bpf_strnstr() wrong 'len' parameter, bpf_strnstr("open", "open", 4) should return 0 instead of -ENOENT. And fix a more general case when s2 is a suffix of the first len characters of s1. Rong Tao (2): bpf/helpers: bpf_strnstr: Exact match length selftests/bpf: Add tests for bpf_strnstr kernel/bpf/helpers.c | 9 ++++++++- .../testing/selftests/bpf/progs/string_kfuncs_success.c | 8 ++++++-- 2 files changed, 14 insertions(+), 3 deletions(-) --- v5: Add more commit message and change the patch 0001's comment; v4: Add comment and more selftests; https://lore.kernel.org/all/tencent_CBD40091C14056E8298BE3725B65EE156405@qq… v3: Fix selftests/bpf error in v2, sorry about that; https://lore.kernel.org/lkml/tencent_69BD268FBA201219240B51661D5E96A8D80A@q… v2: Follow Andrii Nakryiko's advise, fix the 'wrong fix'; https://lore.kernel.org/lkml/tencent_DF4DA83EEBFB9246E5E3357BB40911CCA005@q… v1: https://lore.kernel.org/lkml/tencent_65E5988AD52BEC280D22964189505CD6ED06@q… -- 2.51.0

1 day, 5 hours

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