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[RFC 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. We chose selftests to host these tests primarily to enable integration with the existing KVM selftests. As explained in the next section, enabling KVM developers to test the interaction between VFIO and KVM is one of the motivators of this series. Motivation ----------------------------------------------------------------------- The main motivation for this series is upcoming development in the kernel to support Hypervisor Live Updates [1][2]. Live Update is a specialized reboot process where selected devices are kept operational and their kernel state is preserved and recreated across a kexec. For devices, DMA and interrupts may continue during the reboot. VFIO-bound devices are the main target, since the first usecase of Live Updates is to enable host kernel upgrades in a Cloud Computing environment without disrupting running customer VMs. To prepare for upcoming support for Live Updates in VFIO, IOMMUFD, IOMMU drivers, the PCI layer, etc., we'd like to first lay the ground work for exercising and testing VFIO from kernel selftests. This way when we eventually upstream support for Live Updates, we can also upstream tests for those changes, rather than purely relying on Live Update integration tests which would be hard to share and reproduce upstream. But even without Live Updates, VFIO and IOMMUFD are becoming an increasingly critical component of running KVM-based VMs in cloud environments. Virtualized networking and storage are increasingly being offloaded to smart NICs/cards, and demand for high performance networking, storage, and AI are also leading to NICs, SSDs, and GPUs being directly attached to VMs via VFIO. VFIO selftests increases our ability to test in several ways. - It enables developers sending VFIO, IOMMUFD, etc. commits upstream to test their changes against all existing VFIO selftests, reducing the probability of regressions. - It enables developers sending VFIO, IOMMUFD, etc. commits upstream to include tests alongside their changes, increasing the quality of the code that is merged. - It enables testing the interaction between VFIO and KVM. There are some paths in KVM that are only exercised through VFIO, such as IRQ bypass. VFIO selftests provides a helper library to enable KVM developers to write KVM selftests to test those interactions [3]. Design ----------------------------------------------------------------------- VFIO selftests are designed around interacting with with VFIO-managed PCI devices. As such, the core data struture is struct vfio_pci_device, which represents a single PCI device. struct vfio_pci_device *device; device = vfio_pci_device_init("0000:6a:01.0", iommu_mode); ... vfio_pci_device_cleanup(device); vfio_pci_device_init() sets up a container or iommufd, depending on the iommu_mode argument, to manage DMA mappings, fetches information about the device and what interrupts it supports from VFIO and caches it, and mmap()s all mappable BARs for the test to use. There are helper methods that operate on struct vfio_pci_device to do things like read and write to PCI config space, enable/disable IRQs, and map memory for DMA, struct vfio_pci_device and its methods do not care about what device they are actually interacting with. It can be a GPU, a NIC, an SSD, etc. To keep things simple initially, VFIO selftests only support a single device per group and per container/iommufd. But it should be possible to relax those restrictions in the future, e.g. to enable testing with multiple devices in the same container/iommufd. Driver Framework ----------------------------------------------------------------------- In order to support VFIO selftests where a device is generating DMA and interrupts on command, the VFIO selftests supports a driver framework. This framework abstracts away device-specific details allowing VFIO selftests to be written in a generic way, and then run against different devices depending on what hardware developers have access to. The framework also aims to support carrying drivers out-of-tree, e.g. so that companies can run VFIO selftests with custom/test hardware. Drivers must implement the following methods: - probe(): Check if the driver supports a given device. - init(): Initialize the driver. - remove(): Deinitialize the driver and reset the device. - memcpy_start(): Kick off a series of repeated memcpys (DMA reads and DMA writes). - memcpy_wait(): Wait for a memcpy operation to complete. - send_msi(): Make the device send an MSI interrupt. memcpy_start/wait() are for generating DMA. We separate the operation into 2 steps so that tests can trigger a long-running DMA operation. We expect to use this to stress test Live Updates by kicking off a long-running mempcy operation and then performing a Live Update. These methods are required to not generate any interrupts. send_msi() is used for testing MSI and MSI-x interrupts. The driver tells the test which MSI it will be using via device->driver.msi. It's the responsibility of the test to set up a region of memory and map it into the device for use by the driver, e.g. for in-memory descriptors, before calling init(). A demo of the driver framework can be found in tools/testing/selftests/vfio/vfio_pci_driver_test.c. In addition, this series introduces a new KVM selftest to demonstrate delivering a device MSI directly into a guest, which can be found in tools/testing/selftests/kvm/vfio_pci_device_irq_test.c. 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 Integrating with KVM selftests ----------------------------------------------------------------------- To support testing the interactions between VFIO and KVM, the VFIO selftests support sharing its library with the KVM selftest. The patches at the end of this series demonstrate how that works. Essentially, we allow the KVM selftests to build their own copy of tools/testing/selftests/vfio/lib/ and link it into KVM selftests binaries. This requires minimal changes to the KVM selftests Makefile. Future Areas of Development ----------------------------------------------------------------------- Library: - Driver support for devices that can be used on AMD, ARM, and other platforms. - Driver support for a device available in QEMU VMs. - 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. - Live Update selftests. - Porting Sean's KVM selftest for posted interrupts to use the VFIO selftests library [3] This series can also be found on GitHub: https://github.com/dmatlack/linux/tree/vfio/selftests/rfc 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: Pasha Tatashin <pasha.tatashin(a)soleen.com> Cc: Saeed Mahameed <saeedm(a)nvidia.com> Cc: Saeed Mahameed <saeedm(a)nvidia.com> Cc: Adithya Jayachandran <ajayachandra(a)nvidia.com> Cc: Parav Pandit <parav(a)nvidia.com> Cc: Leon Romanovsky <leonro(a)nvidia.com> Cc: Vinicius Costa Gomes <vinicius.gomes(a)intel.com> Cc: Dave Jiang <dave.jiang(a)intel.com> Cc: Dan Williams <dan.j.williams(a)intel.com> [1] https://lore.kernel.org/all/f35359d5-63e1-8390-619f-67961443bfe1@google.com/ [2] https://lore.kernel.org/all/20250515182322.117840-1-pasha.tatashin@soleen.c… [3] 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: Import drivers/dma/ioat/{hw.h,registers.h} tools headers: Import drivers/dma/idxd/registers.h tools headers: Import 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 vfio: selftests: Add driver for Intel CBDMA vfio: selftests: Add driver for Intel DSA vfio: selftests: Move helper to get cdev path to libvfio vfio: selftests: Encapsulate IOMMU mode vfio: selftests: Add [-i iommu_mode] option to all tests 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: Use real device MSIs in vfio_pci_device_irq_test 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: Use command line to set hugepage size for DMA mapping test vfio: selftests: Validate 2M/1G HugeTLB are mapped as 2M/1G in IOMMU MAINTAINERS | 7 + 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/drivers/dma/idxd/registers.h | 601 +++ tools/include/drivers/dma/ioat/hw.h | 270 ++ tools/include/drivers/dma/ioat/registers.h | 251 ++ tools/include/linux/compiler.h | 4 + tools/include/linux/io.h | 4 +- tools/include/linux/pci_ids.h | 3212 +++++++++++++++++ tools/testing/selftests/Makefile | 1 + tools/testing/selftests/kvm/Makefile.kvm | 6 +- .../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 | 173 + tools/testing/selftests/vfio/.gitignore | 7 + tools/testing/selftests/vfio/Makefile | 20 + .../testing/selftests/vfio/lib/drivers/dsa.c | 416 +++ .../testing/selftests/vfio/lib/drivers/ioat.c | 235 ++ .../selftests/vfio/lib/include/vfio_util.h | 271 ++ tools/testing/selftests/vfio/lib/libvfio.mk | 26 + .../selftests/vfio/lib/vfio_pci_device.c | 573 +++ .../selftests/vfio/lib/vfio_pci_driver.c | 126 + tools/testing/selftests/vfio/run.sh | 110 + .../selftests/vfio/vfio_dma_mapping_test.c | 239 ++ .../selftests/vfio/vfio_iommufd_setup_test.c | 133 + .../selftests/vfio/vfio_pci_device_test.c | 195 + .../selftests/vfio/vfio_pci_driver_test.c | 256 ++ 29 files changed, 7780 insertions(+), 2 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 100644 tools/include/drivers/dma/idxd/registers.h create mode 100644 tools/include/drivers/dma/ioat/hw.h create mode 100644 tools/include/drivers/dma/ioat/registers.h create mode 100644 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.c create mode 100644 tools/testing/selftests/vfio/lib/drivers/ioat.c 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: a11a72229881d8ac1d52ea727101bc9c744189c1 prerequisite-patch-id: 3bae97c9e1093148763235f47a84fa040b512d04 -- 2.49.0.1151.ga128411c76-goog

1 day, 5 hours

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[PATCH v1] selftests/mm: two fixes for the pfnmap test

by David Hildenbrand

When unregistering the signal handler, we have to pass SIG_DFL, and blindly reading from PFN 0 and PFN 1 seems to be problematic on !x86 systems. In particularly, on arm64 tx2 machines where noting resides at these physical memory locations, we can generate RAS errors. Let's fix it by scanning /proc/iomem for actual "System RAM". Reported-by: Ryan Roberts <ryan.roberts(a)arm.com> Closes: https://lore.kernel.org/all/232960c2-81db-47ca-a337-38c4bce5f997@arm.com/T/… Fixes: 2616b370323a ("selftests/mm: add simple VM_PFNMAP tests based on mmap'ing /dev/mem") Reviewed-by: Ryan Roberts <ryan.roberts(a)arm.com> Tested-by: Aishwarya TCV <aishwarya.tcv(a)arm.com> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Shuah Khan <shuah(a)kernel.org> Cc: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Signed-off-by: David Hildenbrand <david(a)redhat.com> --- tools/testing/selftests/mm/pfnmap.c | 61 +++++++++++++++++++++++++++-- 1 file changed, 57 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/mm/pfnmap.c b/tools/testing/selftests/mm/pfnmap.c index 8a9d19b6020c7..866ac023baf5c 100644 --- a/tools/testing/selftests/mm/pfnmap.c +++ b/tools/testing/selftests/mm/pfnmap.c @@ -12,6 +12,8 @@ #include <stdint.h> #include <unistd.h> #include <errno.h> +#include <stdio.h> +#include <ctype.h> #include <fcntl.h> #include <signal.h> #include <setjmp.h> @@ -43,14 +45,62 @@ static int test_read_access(char *addr, size_t size, size_t pagesize) /* Force a read that the compiler cannot optimize out. */ *((volatile char *)(addr + offs)); } - if (signal(SIGSEGV, signal_handler) == SIG_ERR) + if (signal(SIGSEGV, SIG_DFL) == SIG_ERR) return -EINVAL; return ret; } +static int find_ram_target(off_t *phys_addr, + unsigned long long pagesize) +{ + unsigned long long start, end; + char line[80], *end_ptr; + FILE *file; + + /* Search /proc/iomem for the first suitable "System RAM" range. */ + file = fopen("/proc/iomem", "r"); + if (!file) + return -errno; + + while (fgets(line, sizeof(line), file)) { + /* Ignore any child nodes. */ + if (!isalnum(line[0])) + continue; + + if (!strstr(line, "System RAM\n")) + continue; + + start = strtoull(line, &end_ptr, 16); + /* Skip over the "-" */ + end_ptr++; + /* Make end "exclusive". */ + end = strtoull(end_ptr, NULL, 16) + 1; + + /* Actual addresses are not exported */ + if (!start && !end) + break; + + /* We need full pages. */ + start = (start + pagesize - 1) & ~(pagesize - 1); + end &= ~(pagesize - 1); + + if (start != (off_t)start) + break; + + /* We need two pages. */ + if (end > start + 2 * pagesize) { + fclose(file); + *phys_addr = start; + return 0; + } + } + return -ENOENT; +} + FIXTURE(pfnmap) { + off_t phys_addr; size_t pagesize; int dev_mem_fd; char *addr1; @@ -63,14 +113,17 @@ FIXTURE_SETUP(pfnmap) { self->pagesize = getpagesize(); + /* We'll require two physical pages throughout our tests ... */ + if (find_ram_target(&self->phys_addr, self->pagesize)) + SKIP(return, "Cannot find ram target in '/proc/iomem'\n"); + self->dev_mem_fd = open("/dev/mem", O_RDONLY); if (self->dev_mem_fd < 0) SKIP(return, "Cannot open '/dev/mem'\n"); - /* We'll require the first two pages throughout our tests ... */ self->size1 = self->pagesize * 2; self->addr1 = mmap(NULL, self->size1, PROT_READ, MAP_SHARED, - self->dev_mem_fd, 0); + self->dev_mem_fd, self->phys_addr); if (self->addr1 == MAP_FAILED) SKIP(return, "Cannot mmap '/dev/mem'\n"); @@ -129,7 +182,7 @@ TEST_F(pfnmap, munmap_split) */ self->size2 = self->pagesize; self->addr2 = mmap(NULL, self->pagesize, PROT_READ, MAP_SHARED, - self->dev_mem_fd, 0); + self->dev_mem_fd, self->phys_addr); ASSERT_NE(self->addr2, MAP_FAILED); } -- 2.49.0

1 day, 7 hours

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[PATCH v2] selftests/mm: add simple VM_PFNMAP tests based on mmap'ing /dev/mem

by David Hildenbrand

Let's test some basic functionality using /dev/mem. These tests will implicitly cover some PAT (Page Attribute Handling) handling on x86. These tests will only run when /dev/mem access to the first two pages in physical address space is possible and allowed; otherwise, the tests are skipped. On current x86-64 with PAT inside a VM, all tests pass: TAP version 13 1..6 # Starting 6 tests from 1 test cases. # RUN pfnmap.madvise_disallowed ... # OK pfnmap.madvise_disallowed ok 1 pfnmap.madvise_disallowed # RUN pfnmap.munmap_split ... # OK pfnmap.munmap_split ok 2 pfnmap.munmap_split # RUN pfnmap.mremap_fixed ... # OK pfnmap.mremap_fixed ok 3 pfnmap.mremap_fixed # RUN pfnmap.mremap_shrink ... # OK pfnmap.mremap_shrink ok 4 pfnmap.mremap_shrink # RUN pfnmap.mremap_expand ... # OK pfnmap.mremap_expand ok 5 pfnmap.mremap_expand # RUN pfnmap.fork ... # OK pfnmap.fork ok 6 pfnmap.fork # PASSED: 6 / 6 tests passed. # Totals: pass:6 fail:0 xfail:0 xpass:0 skip:0 error:0 However, we are able to trigger: [ 27.888251] x86/PAT: pfnmap:1790 freeing invalid memtype [mem 0x00000000-0x00000fff] There are probably more things worth testing in the future, such as MAP_PRIVATE handling. But this set of tests is sufficient to cover most of the things we will rework regarding PAT handling. Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Shuah Khan <shuah(a)kernel.org> Cc: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Cc: Ingo Molnar <mingo(a)redhat.com> Cc: Peter Xu <peterx(a)redhat.com> Cc: Dev Jain <dev.jain(a)arm.com> Signed-off-by: David Hildenbrand <david(a)redhat.com> --- Hopefully I didn't miss any review feedback. v1 -> v2: * Rewrite using kselftest_harness, which simplifies a lot of things * Add to .gitignore and run_vmtests.sh * Register signal handler on demand * Use volatile trick to force a read (not factoring out FORCE_READ just yet) * Drop mprotect() test case * Add some more comments why we test certain things * Use NULL for mmap() first parameter instead of 0 * Smaller fixes --- tools/testing/selftests/mm/.gitignore | 1 + tools/testing/selftests/mm/Makefile | 1 + tools/testing/selftests/mm/pfnmap.c | 196 ++++++++++++++++++++++ tools/testing/selftests/mm/run_vmtests.sh | 4 + 4 files changed, 202 insertions(+) create mode 100644 tools/testing/selftests/mm/pfnmap.c diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore index 91db34941a143..824266982aa36 100644 --- a/tools/testing/selftests/mm/.gitignore +++ b/tools/testing/selftests/mm/.gitignore @@ -20,6 +20,7 @@ mremap_test on-fault-limit transhuge-stress pagemap_ioctl +pfnmap *.tmp* protection_keys protection_keys_32 diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index ad4d6043a60f0..ae6f994d3add7 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -84,6 +84,7 @@ TEST_GEN_FILES += mremap_test TEST_GEN_FILES += mseal_test TEST_GEN_FILES += on-fault-limit TEST_GEN_FILES += pagemap_ioctl +TEST_GEN_FILES += pfnmap TEST_GEN_FILES += thuge-gen TEST_GEN_FILES += transhuge-stress TEST_GEN_FILES += uffd-stress diff --git a/tools/testing/selftests/mm/pfnmap.c b/tools/testing/selftests/mm/pfnmap.c new file mode 100644 index 0000000000000..8a9d19b6020c7 --- /dev/null +++ b/tools/testing/selftests/mm/pfnmap.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Basic VM_PFNMAP tests relying on mmap() of '/dev/mem' + * + * Copyright 2025, Red Hat, Inc. + * + * Author(s): David Hildenbrand <david(a)redhat.com> + */ +#define _GNU_SOURCE +#include <stdlib.h> +#include <string.h> +#include <stdint.h> +#include <unistd.h> +#include <errno.h> +#include <fcntl.h> +#include <signal.h> +#include <setjmp.h> +#include <linux/mman.h> +#include <sys/mman.h> +#include <sys/wait.h> + +#include "../kselftest_harness.h" +#include "vm_util.h" + +static sigjmp_buf sigjmp_buf_env; + +static void signal_handler(int sig) +{ + siglongjmp(sigjmp_buf_env, -EFAULT); +} + +static int test_read_access(char *addr, size_t size, size_t pagesize) +{ + size_t offs; + int ret; + + if (signal(SIGSEGV, signal_handler) == SIG_ERR) + return -EINVAL; + + ret = sigsetjmp(sigjmp_buf_env, 1); + if (!ret) { + for (offs = 0; offs < size; offs += pagesize) + /* Force a read that the compiler cannot optimize out. */ + *((volatile char *)(addr + offs)); + } + if (signal(SIGSEGV, signal_handler) == SIG_ERR) + return -EINVAL; + + return ret; +} + +FIXTURE(pfnmap) +{ + size_t pagesize; + int dev_mem_fd; + char *addr1; + size_t size1; + char *addr2; + size_t size2; +}; + +FIXTURE_SETUP(pfnmap) +{ + self->pagesize = getpagesize(); + + self->dev_mem_fd = open("/dev/mem", O_RDONLY); + if (self->dev_mem_fd < 0) + SKIP(return, "Cannot open '/dev/mem'\n"); + + /* We'll require the first two pages throughout our tests ... */ + self->size1 = self->pagesize * 2; + self->addr1 = mmap(NULL, self->size1, PROT_READ, MAP_SHARED, + self->dev_mem_fd, 0); + if (self->addr1 == MAP_FAILED) + SKIP(return, "Cannot mmap '/dev/mem'\n"); + + /* ... and want to be able to read from them. */ + if (test_read_access(self->addr1, self->size1, self->pagesize)) + SKIP(return, "Cannot read-access mmap'ed '/dev/mem'\n"); + + self->size2 = 0; + self->addr2 = MAP_FAILED; +} + +FIXTURE_TEARDOWN(pfnmap) +{ + if (self->addr2 != MAP_FAILED) + munmap(self->addr2, self->size2); + if (self->addr1 != MAP_FAILED) + munmap(self->addr1, self->size1); + if (self->dev_mem_fd >= 0) + close(self->dev_mem_fd); +} + +TEST_F(pfnmap, madvise_disallowed) +{ + int advices[] = { + MADV_DONTNEED, + MADV_DONTNEED_LOCKED, + MADV_FREE, + MADV_WIPEONFORK, + MADV_COLD, + MADV_PAGEOUT, + MADV_POPULATE_READ, + MADV_POPULATE_WRITE, + }; + int i; + + /* All these advices must be rejected. */ + for (i = 0; i < ARRAY_SIZE(advices); i++) { + EXPECT_LT(madvise(self->addr1, self->pagesize, advices[i]), 0); + EXPECT_EQ(errno, EINVAL); + } +} + +TEST_F(pfnmap, munmap_split) +{ + /* + * Unmap the first page. This munmap() call is not really expected to + * fail, but we might be able to trigger other internal issues. + */ + ASSERT_EQ(munmap(self->addr1, self->pagesize), 0); + + /* + * Remap the first page while the second page is still mapped. This + * makes sure that any PAT tracking on x86 will allow for mmap()'ing + * a page again while some parts of the first mmap() are still + * around. + */ + self->size2 = self->pagesize; + self->addr2 = mmap(NULL, self->pagesize, PROT_READ, MAP_SHARED, + self->dev_mem_fd, 0); + ASSERT_NE(self->addr2, MAP_FAILED); +} + +TEST_F(pfnmap, mremap_fixed) +{ + char *ret; + + /* Reserve a destination area. */ + self->size2 = self->size1; + self->addr2 = mmap(NULL, self->size2, PROT_READ, MAP_ANON | MAP_PRIVATE, + -1, 0); + ASSERT_NE(self->addr2, MAP_FAILED); + + /* mremap() over our destination. */ + ret = mremap(self->addr1, self->size1, self->size2, + MREMAP_FIXED | MREMAP_MAYMOVE, self->addr2); + ASSERT_NE(ret, MAP_FAILED); +} + +TEST_F(pfnmap, mremap_shrink) +{ + char *ret; + + /* Shrinking is expected to work. */ + ret = mremap(self->addr1, self->size1, self->size1 - self->pagesize, 0); + ASSERT_NE(ret, MAP_FAILED); +} + +TEST_F(pfnmap, mremap_expand) +{ + /* + * Growing is not expected to work, and getting it right would + * be challenging. So this test primarily serves as an early warning + * that something that probably should never work suddenly works. + */ + self->size2 = self->size1 + self->pagesize; + self->addr2 = mremap(self->addr1, self->size1, self->size2, MREMAP_MAYMOVE); + ASSERT_EQ(self->addr2, MAP_FAILED); +} + +TEST_F(pfnmap, fork) +{ + pid_t pid; + int ret; + + /* fork() a child and test if the child can access the pages. */ + pid = fork(); + ASSERT_GE(pid, 0); + + if (!pid) { + EXPECT_EQ(test_read_access(self->addr1, self->size1, + self->pagesize), 0); + exit(0); + } + + wait(&ret); + if (WIFEXITED(ret)) + ret = WEXITSTATUS(ret); + else + ret = -EINVAL; + ASSERT_EQ(ret, 0); +} + +TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index 188b125bf1f6b..dddd1dd8af145 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -63,6 +63,8 @@ separated by spaces: test soft dirty page bit semantics - pagemap test pagemap_scan IOCTL +- pfnmap + tests for VM_PFNMAP handling - cow test copy-on-write semantics - thp @@ -472,6 +474,8 @@ fi CATEGORY="pagemap" run_test ./pagemap_ioctl +CATEGORY="pfnmap" run_test ./pfnmap + # COW tests CATEGORY="cow" run_test ./cow -- 2.49.0

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[PATCH RFC net-next v2] page_pool: import Jesper's page_pool benchmark

by Mina Almasry

From: Jesper Dangaard Brouer <hawk(a)kernel.org> We frequently consult with Jesper's out-of-tree page_pool benchmark to evaluate page_pool changes. Import the benchmark into the upstream linux kernel tree so that (a) we're all running the same version, (b) pave the way for shared improvements, and (c) maybe one day integrate it with nipa, if possible. Import bench_page_pool_simple from commit 35b1716d0c30 ("Add page_bench06_walk_all"), from this repository: https://github.com/netoptimizer/prototype-kernel.git Changes done during upstreaming: - Fix checkpatch issues. - Remove the tasklet logic not needed. - Move under tools/testing - Create ksft for the benchmark. - Changed slightly how the benchmark gets build. Out of tree, time_bench is built as an independent .ko. Here it is included in bench_page_pool.ko Steps to run: ``` mkdir -p /tmp/run-pp-bench make -C ./tools/testing/selftests/net/bench make -C ./tools/testing/selftests/net/bench install INSTALL_PATH=/tmp/run-pp-bench rsync --delete -avz --progress /tmp/run-pp-bench mina@$SERVER:~/ ssh mina@$SERVER << EOF cd ~/run-pp-bench && sudo ./test_bench_page_pool.sh EOF ``` Output: ``` (benchmrk dmesg logs) Fast path results: no-softirq-page_pool01 Per elem: 11 cycles(tsc) 4.368 ns ptr_ring results: no-softirq-page_pool02 Per elem: 527 cycles(tsc) 195.187 ns slow path results: no-softirq-page_pool03 Per elem: 549 cycles(tsc) 203.466 ns ``` Cc: Jesper Dangaard Brouer <hawk(a)kernel.org> Cc: Ilias Apalodimas <ilias.apalodimas(a)linaro.org> Cc: Jakub Kicinski <kuba(a)kernel.org> Cc: Toke Høiland-Jørgensen <toke(a)toke.dk> Signed-off-by: Mina Almasry <almasrymina(a)google.com> --- v2: - Move under tools/selftests (Jakub) - Create ksft for it. - Remove the tasklet logic no longer needed (Jesper + Toke) RFC discussion points: - Desirable to import it? - Can the benchmark be imported as-is for an initial version? Or needs lots of modifications? - Code location. I retained the location in Jesper's tree, but a path like net/core/bench/ may make more sense. --- tools/testing/selftests/net/bench/Makefile | 7 + .../selftests/net/bench/page_pool/Makefile | 17 + .../bench/page_pool/bench_page_pool_simple.c | 275 ++++++++++++ .../bench/page_pool/test_bench_page_pool.sh | 32 ++ .../net/bench/page_pool/time_bench.c | 406 ++++++++++++++++++ .../net/bench/page_pool/time_bench.h | 259 +++++++++++ 6 files changed, 996 insertions(+) create mode 100644 tools/testing/selftests/net/bench/Makefile create mode 100644 tools/testing/selftests/net/bench/page_pool/Makefile create mode 100644 tools/testing/selftests/net/bench/page_pool/bench_page_pool_simple.c create mode 100755 tools/testing/selftests/net/bench/page_pool/test_bench_page_pool.sh create mode 100644 tools/testing/selftests/net/bench/page_pool/time_bench.c create mode 100644 tools/testing/selftests/net/bench/page_pool/time_bench.h diff --git a/tools/testing/selftests/net/bench/Makefile b/tools/testing/selftests/net/bench/Makefile new file mode 100644 index 000000000000..4ebce5d71b18 --- /dev/null +++ b/tools/testing/selftests/net/bench/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 + +TEST_GEN_MODS_DIR := page_pool + +TEST_PROGS += page_pool/test_bench_page_pool.sh + +include ../../lib.mk diff --git a/tools/testing/selftests/net/bench/page_pool/Makefile b/tools/testing/selftests/net/bench/page_pool/Makefile new file mode 100644 index 000000000000..0549a16ba275 --- /dev/null +++ b/tools/testing/selftests/net/bench/page_pool/Makefile @@ -0,0 +1,17 @@ +BENCH_PAGE_POOL_SIMPLE_TEST_DIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST))))) +KDIR ?= /lib/modules/$(shell uname -r)/build + +ifeq ($(V),1) +Q = +else +Q = @ +endif + +obj-m += bench_page_pool.o +bench_page_pool-y += bench_page_pool_simple.o time_bench.o + +all: + +$(Q)make -C $(KDIR) M=$(BENCH_PAGE_POOL_SIMPLE_TEST_DIR) modules + +clean: + +$(Q)make -C $(KDIR) M=$(BENCH_PAGE_POOL_SIMPLE_TEST_DIR) clean diff --git a/tools/testing/selftests/net/bench/page_pool/bench_page_pool_simple.c b/tools/testing/selftests/net/bench/page_pool/bench_page_pool_simple.c new file mode 100644 index 000000000000..53d168cce27d --- /dev/null +++ b/tools/testing/selftests/net/bench/page_pool/bench_page_pool_simple.c @@ -0,0 +1,275 @@ +/* + * Benchmark module for page_pool. + * + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/mutex.h> + +#include <linux/version.h> +#include <net/page_pool/helpers.h> + +#include <linux/interrupt.h> +#include <linux/limits.h> + +#include "time_bench.h" + +static int verbose = 1; +#define MY_POOL_SIZE 1024 + +static inline void _page_pool_put_page(struct page_pool *pool, + struct page *page, bool allow_direct) +{ + page_pool_put_page(pool, page, -1, allow_direct); +} + +/* Makes tests selectable. Useful for perf-record to analyze a single test. + * Hint: Bash shells support writing binary number like: $((2#101010) + * + * # modprobe bench_page_pool_simple run_flags=$((2#100)) + */ +static unsigned long run_flags = 0xFFFFFFFF; +module_param(run_flags, ulong, 0); +MODULE_PARM_DESC(run_flags, "Limit which bench test that runs"); +/* Count the bit number from the enum */ +enum benchmark_bit { + bit_run_bench_baseline, + bit_run_bench_no_softirq01, + bit_run_bench_no_softirq02, + bit_run_bench_no_softirq03, +}; +#define bit(b) (1 << (b)) +#define enabled(b) ((run_flags & (bit(b)))) + +/* notice time_bench is limited to U32_MAX nr loops */ +static unsigned long loops = 10000000; +module_param(loops, ulong, 0); +MODULE_PARM_DESC(loops, "Specify loops bench will run"); + +/* Timing at the nanosec level, we need to know the overhead + * introduced by the for loop itself */ +static int time_bench_for_loop(struct time_bench_record *rec, void *data) +{ + uint64_t loops_cnt = 0; + int i; + + time_bench_start(rec); + /** Loop to measure **/ + for (i = 0; i < rec->loops; i++) { + loops_cnt++; + barrier(); /* avoid compiler to optimize this loop */ + } + time_bench_stop(rec, loops_cnt); + return loops_cnt; +} + +static int time_bench_atomic_inc(struct time_bench_record *rec, void *data) +{ + uint64_t loops_cnt = 0; + atomic_t cnt; + int i; + + atomic_set(&cnt, 0); + + time_bench_start(rec); + /** Loop to measure **/ + for (i = 0; i < rec->loops; i++) { + atomic_inc(&cnt); + barrier(); /* avoid compiler to optimize this loop */ + } + loops_cnt = atomic_read(&cnt); + time_bench_stop(rec, loops_cnt); + return loops_cnt; +} + +/* The ptr_ping in page_pool uses a spinlock. We need to know the minimum + * overhead of taking+releasing a spinlock, to know the cycles that can be saved + * by e.g. amortizing this via bulking. + */ +static int time_bench_lock(struct time_bench_record *rec, void *data) +{ + uint64_t loops_cnt = 0; + spinlock_t lock; + int i; + + spin_lock_init(&lock); + + time_bench_start(rec); + /** Loop to measure **/ + for (i = 0; i < rec->loops; i++) { + spin_lock(&lock); + loops_cnt++; + barrier(); /* avoid compiler to optimize this loop */ + spin_unlock(&lock); + } + time_bench_stop(rec, loops_cnt); + return loops_cnt; +} + +/* Helper for filling some page's into ptr_ring */ +static void pp_fill_ptr_ring(struct page_pool *pp, int elems) +{ + gfp_t gfp_mask = GFP_ATOMIC; /* GFP_ATOMIC needed when under run softirq */ + struct page **array; + int i; + + array = kzalloc(sizeof(struct page *) * elems, gfp_mask); + + for (i = 0; i < elems; i++) { + array[i] = page_pool_alloc_pages(pp, gfp_mask); + } + for (i = 0; i < elems; i++) { + _page_pool_put_page(pp, array[i], false); + } + + kfree(array); +} + +enum test_type { type_fast_path, type_ptr_ring, type_page_allocator }; + +/* Depends on compile optimizing this function */ +static __always_inline int time_bench_page_pool(struct time_bench_record *rec, + void *data, enum test_type type, + const char *func) +{ + uint64_t loops_cnt = 0; + gfp_t gfp_mask = GFP_ATOMIC; /* GFP_ATOMIC is not really needed */ + int i, err; + + struct page_pool *pp; + struct page *page; + + struct page_pool_params pp_params = { + .order = 0, + .flags = 0, + .pool_size = MY_POOL_SIZE, + .nid = NUMA_NO_NODE, + .dev = NULL, /* Only use for DMA mapping */ + .dma_dir = DMA_BIDIRECTIONAL, + }; + + pp = page_pool_create(&pp_params); + if (IS_ERR(pp)) { + err = PTR_ERR(pp); + pr_warn("%s: Error(%d) creating page_pool\n", func, err); + goto out; + } + pp_fill_ptr_ring(pp, 64); + + if (in_serving_softirq()) + pr_warn("%s(): in_serving_softirq fast-path\n", func); + else + pr_warn("%s(): Cannot use page_pool fast-path\n", func); + + time_bench_start(rec); + /** Loop to measure **/ + for (i = 0; i < rec->loops; i++) { + /* Common fast-path alloc, that depend on in_serving_softirq() */ + page = page_pool_alloc_pages(pp, gfp_mask); + if (!page) + break; + loops_cnt++; + barrier(); /* avoid compiler to optimize this loop */ + + /* The benchmarks purpose it to test different return paths. + * Compiler should inline optimize other function calls out + */ + if (type == type_fast_path) { + /* Fast-path recycling e.g. XDP_DROP use-case */ + page_pool_recycle_direct(pp, page); + + } else if (type == type_ptr_ring) { + /* Normal return path */ + _page_pool_put_page(pp, page, false); + + } else if (type == type_page_allocator) { + /* Test if not pages are recycled, but instead + * returned back into systems page allocator + */ + get_page(page); /* cause no-recycling */ + _page_pool_put_page(pp, page, false); + put_page(page); + } else { + BUILD_BUG(); + } + } + time_bench_stop(rec, loops_cnt); +out: + page_pool_destroy(pp); + return loops_cnt; +} + +static int time_bench_page_pool01_fast_path(struct time_bench_record *rec, + void *data) +{ + return time_bench_page_pool(rec, data, type_fast_path, __func__); +} + +static int time_bench_page_pool02_ptr_ring(struct time_bench_record *rec, + void *data) +{ + return time_bench_page_pool(rec, data, type_ptr_ring, __func__); +} + +static int time_bench_page_pool03_slow(struct time_bench_record *rec, + void *data) +{ + return time_bench_page_pool(rec, data, type_page_allocator, __func__); +} + +static int run_benchmark_tests(void) +{ + uint32_t nr_loops = loops; + int passed_count = 0; + + /* Baseline tests */ + if (enabled(bit_run_bench_baseline)) { + time_bench_loop(nr_loops * 10, 0, "for_loop", NULL, + time_bench_for_loop); + time_bench_loop(nr_loops * 10, 0, "atomic_inc", NULL, + time_bench_atomic_inc); + time_bench_loop(nr_loops, 0, "lock", NULL, time_bench_lock); + } + + /* This test cannot activate correct code path, due to no-softirq ctx */ + if (enabled(bit_run_bench_no_softirq01)) + time_bench_loop(nr_loops, 0, "no-softirq-page_pool01", NULL, + time_bench_page_pool01_fast_path); + if (enabled(bit_run_bench_no_softirq02)) + time_bench_loop(nr_loops, 0, "no-softirq-page_pool02", NULL, + time_bench_page_pool02_ptr_ring); + if (enabled(bit_run_bench_no_softirq03)) + time_bench_loop(nr_loops, 0, "no-softirq-page_pool03", NULL, + time_bench_page_pool03_slow); + + return passed_count; +} + +static int __init bench_page_pool_simple_module_init(void) +{ + if (verbose) + pr_info("Loaded\n"); + + if (loops > U32_MAX) { + pr_err("Module param loops(%lu) exceeded U32_MAX(%u)\n", loops, + U32_MAX); + return -ECHRNG; + } + + run_benchmark_tests(); + + return 0; +} +module_init(bench_page_pool_simple_module_init); + +static void __exit bench_page_pool_simple_module_exit(void) +{ + if (verbose) + pr_info("Unloaded\n"); +} +module_exit(bench_page_pool_simple_module_exit); + +MODULE_DESCRIPTION("Benchmark of page_pool simple cases"); +MODULE_AUTHOR("Jesper Dangaard Brouer <netoptimizer(a)brouer.com>"); +MODULE_LICENSE("GPL"); diff --git a/tools/testing/selftests/net/bench/page_pool/test_bench_page_pool.sh b/tools/testing/selftests/net/bench/page_pool/test_bench_page_pool.sh new file mode 100755 index 000000000000..5eb48f28b659 --- /dev/null +++ b/tools/testing/selftests/net/bench/page_pool/test_bench_page_pool.sh @@ -0,0 +1,32 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# + +set -e + +DRIVER="./page_pool/bench_page_pool.ko" +result="" + +function run_test() +{ + rmmod "bench_page_pool.ko" || true + insmod $DRIVER > /dev/null 2>&1 + result=$(dmesg | tail -10) + echo "$result" + + echo + echo "Fast path results:" + echo ${result} | grep -o -E "no-softirq-page_pool01 Per elem: ([0-9]+) cycles$tsc$ ([0-9]+\.[0-9]+) ns" + + echo + echo "ptr_ring results:" + echo ${result} | grep -o -E "no-softirq-page_pool02 Per elem: ([0-9]+) cycles$tsc$ ([0-9]+\.[0-9]+) ns" + + echo + echo "slow path results:" + echo ${result} | grep -o -E "no-softirq-page_pool03 Per elem: ([0-9]+) cycles$tsc$ ([0-9]+\.[0-9]+) ns" +} + +run_test + +exit 0 diff --git a/tools/testing/selftests/net/bench/page_pool/time_bench.c b/tools/testing/selftests/net/bench/page_pool/time_bench.c new file mode 100644 index 000000000000..257b1515c64e --- /dev/null +++ b/tools/testing/selftests/net/bench/page_pool/time_bench.c @@ -0,0 +1,406 @@ +/* + * Benchmarking code execution time inside the kernel + * + * Copyright (C) 2014, Red Hat, Inc., Jesper Dangaard Brouer + * for licensing details see kernel-base/COPYING + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/time.h> + +#include <linux/perf_event.h> /* perf_event_create_kernel_counter() */ + +/* For concurrency testing */ +#include <linux/completion.h> +#include <linux/sched.h> +#include <linux/workqueue.h> +#include <linux/kthread.h> + +#include "time_bench.h" + +static int verbose = 1; + +/** TSC (Time-Stamp Counter) based ** + * See: linux/time_bench.h + * tsc_start_clock() and tsc_stop_clock() + */ + +/** Wall-clock based ** + */ + +/** PMU (Performance Monitor Unit) based ** + */ +#define PERF_FORMAT \ + (PERF_FORMAT_GROUP | PERF_FORMAT_ID | PERF_FORMAT_TOTAL_TIME_ENABLED | \ + PERF_FORMAT_TOTAL_TIME_RUNNING) + +struct raw_perf_event { + uint64_t config; /* event */ + uint64_t config1; /* umask */ + struct perf_event *save; + char *desc; +}; + +/* if HT is enable a maximum of 4 events (5 if one is instructions + * retired can be specified, if HT is disabled a maximum of 8 (9 if + * one is instructions retired) can be specified. + * + * From Table 19-1. Architectural Performance Events + * Architectures Software Developer’s Manual Volume 3: System Programming Guide + */ +struct raw_perf_event perf_events[] = { + { 0x3c, 0x00, NULL, "Unhalted CPU Cycles" }, + { 0xc0, 0x00, NULL, "Instruction Retired" } +}; + +#define NUM_EVTS (sizeof(perf_events) / sizeof(struct raw_perf_event)) + +/* WARNING: PMU config is currently broken! + */ +bool time_bench_PMU_config(bool enable) +{ + int i; + struct perf_event_attr perf_conf; + struct perf_event *perf_event; + int cpu; + + preempt_disable(); + cpu = smp_processor_id(); + pr_info("DEBUG: cpu:%d\n", cpu); + preempt_enable(); + + memset(&perf_conf, 0, sizeof(struct perf_event_attr)); + perf_conf.type = PERF_TYPE_RAW; + perf_conf.size = sizeof(struct perf_event_attr); + perf_conf.read_format = PERF_FORMAT; + perf_conf.pinned = 1; + perf_conf.exclude_user = 1; /* No userspace events */ + perf_conf.exclude_kernel = 0; /* Only kernel events */ + + for (i = 0; i < NUM_EVTS; i++) { + perf_conf.disabled = enable; + //perf_conf.disabled = (i == 0) ? 1 : 0; + perf_conf.config = perf_events[i].config; + perf_conf.config1 = perf_events[i].config1; + if (verbose) + pr_info("%s() enable PMU counter: %s\n", + __func__, perf_events[i].desc); + perf_event = perf_event_create_kernel_counter(&perf_conf, cpu, + NULL /* task */, + NULL /* overflow_handler*/, + NULL /* context */); + if (perf_event) { + perf_events[i].save = perf_event; + pr_info("%s():DEBUG perf_event success\n", __func__); + + perf_event_enable(perf_event); + } else { + pr_info("%s():DEBUG perf_event is NULL\n", __func__); + } + } + + return true; +} + +/** Generic functions ** + */ + +/* Calculate stats, store results in record */ +bool time_bench_calc_stats(struct time_bench_record *rec) +{ +#define NANOSEC_PER_SEC 1000000000 /* 10^9 */ + uint64_t ns_per_call_tmp_rem = 0; + uint32_t ns_per_call_remainder = 0; + uint64_t pmc_ipc_tmp_rem = 0; + uint32_t pmc_ipc_remainder = 0; + uint32_t pmc_ipc_div = 0; + uint32_t invoked_cnt_precision = 0; + uint32_t invoked_cnt = 0; /* 32-bit due to div_u64_rem() */ + + if (rec->flags & TIME_BENCH_LOOP) { + if (rec->invoked_cnt < 1000) { + pr_err("ERR: need more(>1000) loops(%llu) for timing\n", + rec->invoked_cnt); + return false; + } + if (rec->invoked_cnt > ((1ULL << 32) - 1)) { + /* div_u64_rem() can only support div with 32bit*/ + pr_err("ERR: Invoke cnt(%llu) too big overflow 32bit\n", + rec->invoked_cnt); + return false; + } + invoked_cnt = (uint32_t)rec->invoked_cnt; + } + + /* TSC (Time-Stamp Counter) records */ + if (rec->flags & TIME_BENCH_TSC) { + rec->tsc_interval = rec->tsc_stop - rec->tsc_start; + if (rec->tsc_interval == 0) { + pr_err("ABORT: timing took ZERO TSC time\n"); + return false; + } + /* Calculate stats */ + if (rec->flags & TIME_BENCH_LOOP) + rec->tsc_cycles = rec->tsc_interval / invoked_cnt; + else + rec->tsc_cycles = rec->tsc_interval; + } + + /* Wall-clock time calc */ + if (rec->flags & TIME_BENCH_WALLCLOCK) { + rec->time_start = rec->ts_start.tv_nsec + + (NANOSEC_PER_SEC * rec->ts_start.tv_sec); + rec->time_stop = rec->ts_stop.tv_nsec + + (NANOSEC_PER_SEC * rec->ts_stop.tv_sec); + rec->time_interval = rec->time_stop - rec->time_start; + if (rec->time_interval == 0) { + pr_err("ABORT: timing took ZERO wallclock time\n"); + return false; + } + /* Calculate stats */ + /*** Division in kernel it tricky ***/ + /* Orig: time_sec = (time_interval / NANOSEC_PER_SEC); */ + /* remainder only correct because NANOSEC_PER_SEC is 10^9 */ + rec->time_sec = div_u64_rem(rec->time_interval, NANOSEC_PER_SEC, + &rec->time_sec_remainder); + //TODO: use existing struct timespec records instead of div? + + if (rec->flags & TIME_BENCH_LOOP) { + /*** Division in kernel it tricky ***/ + /* Orig: ns = ((double)time_interval / invoked_cnt); */ + /* First get quotient */ + rec->ns_per_call_quotient = + div_u64_rem(rec->time_interval, invoked_cnt, + &ns_per_call_remainder); + /* Now get decimals .xxx precision (incorrect roundup)*/ + ns_per_call_tmp_rem = ns_per_call_remainder; + invoked_cnt_precision = invoked_cnt / 1000; + if (invoked_cnt_precision > 0) { + rec->ns_per_call_decimal = + div_u64_rem(ns_per_call_tmp_rem, + invoked_cnt_precision, + &ns_per_call_remainder); + } + } + } + + /* Performance Monitor Unit (PMU) counters */ + if (rec->flags & TIME_BENCH_PMU) { + //FIXME: Overflow handling??? + rec->pmc_inst = rec->pmc_inst_stop - rec->pmc_inst_start; + rec->pmc_clk = rec->pmc_clk_stop - rec->pmc_clk_start; + + /* Calc Instruction Per Cycle (IPC) */ + /* First get quotient */ + rec->pmc_ipc_quotient = div_u64_rem(rec->pmc_inst, rec->pmc_clk, + &pmc_ipc_remainder); + /* Now get decimals .xxx precision (incorrect roundup)*/ + pmc_ipc_tmp_rem = pmc_ipc_remainder; + pmc_ipc_div = rec->pmc_clk / 1000; + if (pmc_ipc_div > 0) { + rec->pmc_ipc_decimal = div_u64_rem(pmc_ipc_tmp_rem, + pmc_ipc_div, + &pmc_ipc_remainder); + } + } + + return true; +} + +/* Generic function for invoking a loop function and calculating + * execution time stats. The function being called/timed is assumed + * to perform a tight loop, and update the timing record struct. + */ +bool time_bench_loop(uint32_t loops, int step, char *txt, void *data, + int (*func)(struct time_bench_record *record, void *data)) +{ + struct time_bench_record rec; + + /* Setup record */ + memset(&rec, 0, sizeof(rec)); /* zero func might not update all */ + rec.version_abi = 1; + rec.loops = loops; + rec.step = step; + rec.flags = (TIME_BENCH_LOOP|TIME_BENCH_TSC|TIME_BENCH_WALLCLOCK); +// rec.flags = (TIME_BENCH_LOOP|TIME_BENCH_TSC| +// TIME_BENCH_WALLCLOCK|TIME_BENCH_PMU); + //TODO: Add/copy txt to rec + + /*** Loop function being timed ***/ + if (!func(&rec, data)) { + pr_err("ABORT: function being timed failed\n"); + return false; + } + + if (rec.invoked_cnt < loops) + pr_warn("WARNING: Invoke count(%llu) smaller than loops(%d)\n", + rec.invoked_cnt, loops); + + /* Calculate stats */ + time_bench_calc_stats(&rec); + + pr_info("Type:%s Per elem: %llu cycles(tsc) %llu.%03llu ns (step:%d)" + " - (measurement period time:%llu.%09u sec time_interval:%llu)" + " - (invoke count:%llu tsc_interval:%llu)\n", + txt, rec.tsc_cycles, + rec.ns_per_call_quotient, rec.ns_per_call_decimal, rec.step, + rec.time_sec, rec.time_sec_remainder, rec.time_interval, + rec.invoked_cnt, rec.tsc_interval); +/* pr_info("DEBUG check is %llu/%llu == %llu.%03llu ?\n", + rec.time_interval, rec.invoked_cnt, + rec.ns_per_call_quotient, rec.ns_per_call_decimal); +*/ + if (rec.flags & TIME_BENCH_PMU) { + pr_info("Type:%s PMU inst/clock" + "%llu/%llu = %llu.%03llu IPC (inst per cycle)\n", + txt, rec.pmc_inst, rec.pmc_clk, + rec.pmc_ipc_quotient, rec.pmc_ipc_decimal); + } + return true; +} + +/* Function getting invoked by kthread */ +static int invoke_test_on_cpu_func(void *private) +{ + struct time_bench_cpu *cpu = private; + struct time_bench_sync *sync = cpu->sync; + cpumask_t newmask = CPU_MASK_NONE; + void *data = cpu->data; + + /* Restrict CPU */ + cpumask_set_cpu(cpu->rec.cpu, &newmask); + set_cpus_allowed_ptr(current, &newmask); + + /* Synchronize start of concurrency test */ + atomic_inc(&sync->nr_tests_running); + wait_for_completion(&sync->start_event); + + /* Start benchmark function */ + if (!cpu->bench_func(&cpu->rec, data)) { + pr_err("ERROR: function being timed failed on CPU:%d(%d)\n", + cpu->rec.cpu, smp_processor_id()); + } else { + if (verbose) + pr_info("SUCCESS: ran on CPU:%d(%d)\n", cpu->rec.cpu, + smp_processor_id()); + } + cpu->did_bench_run = true; + + /* End test */ + atomic_dec(&sync->nr_tests_running); + /* Wait for kthread_stop() telling us to stop */ + while (!kthread_should_stop()) { + set_current_state(TASK_INTERRUPTIBLE); + schedule(); + } + __set_current_state(TASK_RUNNING); + return 0; +} + +void time_bench_print_stats_cpumask(const char *desc, + struct time_bench_cpu *cpu_tasks, + const struct cpumask *mask) +{ + uint64_t average = 0; + int cpu; + int step = 0; + struct sum { + uint64_t tsc_cycles; + int records; + } sum = { 0 }; + + /* Get stats */ + for_each_cpu(cpu, mask) { + struct time_bench_cpu *c = &cpu_tasks[cpu]; + struct time_bench_record *rec = &c->rec; + + /* Calculate stats */ + time_bench_calc_stats(rec); + + pr_info("Type:%s CPU(%d) %llu cycles(tsc) %llu.%03llu ns" + " (step:%d)" + " - (measurement period time:%llu.%09u sec time_interval:%llu)" + " - (invoke count:%llu tsc_interval:%llu)\n", + desc, cpu, rec->tsc_cycles, rec->ns_per_call_quotient, + rec->ns_per_call_decimal, rec->step, rec->time_sec, + rec->time_sec_remainder, rec->time_interval, + rec->invoked_cnt, rec->tsc_interval); + + /* Collect average */ + sum.records++; + sum.tsc_cycles += rec->tsc_cycles; + step = rec->step; + } + + if (sum.records) /* avoid div-by-zero */ + average = sum.tsc_cycles / sum.records; + pr_info("Sum Type:%s Average: %llu cycles(tsc) CPUs:%d step:%d\n", desc, + average, sum.records, step); +} + +void time_bench_run_concurrent( + uint32_t loops, int step, void *data, + const struct cpumask *mask, /* Support masking outsome CPUs*/ + struct time_bench_sync *sync, struct time_bench_cpu *cpu_tasks, + int (*func)(struct time_bench_record *record, void *data)) +{ + int cpu, running = 0; + + if (verbose) // DEBUG + pr_warn("%s() Started on CPU:%d\n", __func__, + smp_processor_id()); + + /* Reset sync conditions */ + atomic_set(&sync->nr_tests_running, 0); + init_completion(&sync->start_event); + + /* Spawn off jobs on all CPUs */ + for_each_cpu(cpu, mask) { + struct time_bench_cpu *c = &cpu_tasks[cpu]; + + running++; + c->sync = sync; /* Send sync variable along */ + c->data = data; /* Send opaque along */ + + /* Init benchmark record */ + memset(&c->rec, 0, sizeof(struct time_bench_record)); + c->rec.version_abi = 1; + c->rec.loops = loops; + c->rec.step = step; + c->rec.flags = (TIME_BENCH_LOOP|TIME_BENCH_TSC| + TIME_BENCH_WALLCLOCK); + c->rec.cpu = cpu; + c->bench_func = func; + c->task = kthread_run(invoke_test_on_cpu_func, c, + "time_bench%d", cpu); + if (IS_ERR(c->task)) { + pr_err("%s(): Failed to start test func\n", __func__); + return; /* Argh, what about cleanup?! */ + } + } + + /* Wait until all processes are running */ + while (atomic_read(&sync->nr_tests_running) < running) { + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(10); + } + /* Kick off all CPU concurrently on completion event */ + complete_all(&sync->start_event); + + /* Wait for CPUs to finish */ + while (atomic_read(&sync->nr_tests_running)) { + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(10); + } + + /* Stop the kthreads */ + for_each_cpu(cpu, mask) { + struct time_bench_cpu *c = &cpu_tasks[cpu]; + kthread_stop(c->task); + } + + if (verbose) // DEBUG - happens often, finish on another CPU + pr_warn("%s() Finished on CPU:%d\n", __func__, + smp_processor_id()); +} diff --git a/tools/testing/selftests/net/bench/page_pool/time_bench.h b/tools/testing/selftests/net/bench/page_pool/time_bench.h new file mode 100644 index 000000000000..7331b5789490 --- /dev/null +++ b/tools/testing/selftests/net/bench/page_pool/time_bench.h @@ -0,0 +1,259 @@ +/* + * Benchmarking code execution time inside the kernel + * + * Copyright (C) 2014, Red Hat, Inc., Jesper Dangaard Brouer + * for licensing details see kernel-base/COPYING + */ +#ifndef _LINUX_TIME_BENCH_H +#define _LINUX_TIME_BENCH_H + +/* Main structure used for recording a benchmark run */ +struct time_bench_record { + uint32_t version_abi; + uint32_t loops; /* Requested loop invocations */ + uint32_t step; /* option for e.g. bulk invocations */ + + uint32_t flags; /* Measurements types enabled */ +#define TIME_BENCH_LOOP (1<<0) +#define TIME_BENCH_TSC (1<<1) +#define TIME_BENCH_WALLCLOCK (1<<2) +#define TIME_BENCH_PMU (1<<3) + + uint32_t cpu; /* Used when embedded in time_bench_cpu */ + + /* Records */ + uint64_t invoked_cnt; /* Returned actual invocations */ + uint64_t tsc_start; + uint64_t tsc_stop; + struct timespec64 ts_start; + struct timespec64 ts_stop; + /** PMU counters for instruction and cycles + * instructions counter including pipelined instructions */ + uint64_t pmc_inst_start; + uint64_t pmc_inst_stop; + /* CPU unhalted clock counter */ + uint64_t pmc_clk_start; + uint64_t pmc_clk_stop; + + /* Result records */ + uint64_t tsc_interval; + uint64_t time_start, time_stop, time_interval; /* in nanosec */ + uint64_t pmc_inst, pmc_clk; + + /* Derived result records */ + uint64_t tsc_cycles; // +decimal? + uint64_t ns_per_call_quotient, ns_per_call_decimal; + uint64_t time_sec; + uint32_t time_sec_remainder; + uint64_t pmc_ipc_quotient, pmc_ipc_decimal; /* inst per cycle */ +}; + +/* For synchronizing parallel CPUs to run concurrently */ +struct time_bench_sync { + atomic_t nr_tests_running; + struct completion start_event; +}; + +/* Keep track of CPUs executing our bench function. + * + * Embed a time_bench_record for storing info per cpu + */ +struct time_bench_cpu { + struct time_bench_record rec; + struct time_bench_sync *sync; /* back ptr */ + struct task_struct *task; + /* "data" opaque could have been placed in time_bench_sync, + * but to avoid any false sharing, place it per CPU + */ + void *data; + /* Support masking outsome CPUs, mark if it ran */ + bool did_bench_run; + /* int cpu; // note CPU stored in time_bench_record */ + int (*bench_func)(struct time_bench_record *record, void *data); +}; + +/* + * Below TSC assembler code is not compatible with other archs, and + * can also fail on guests if cpu-flags are not correct. + * + * The way TSC reading is used, many iterations, does not require as + * high accuracy as described below (in Intel Doc #324264). + * + * Considering changing to use get_cycles() (#include <asm/timex.h>). + */ + +/** TSC (Time-Stamp Counter) based ** + * Recommend reading, to understand details of reading TSC accurately: + * Intel Doc #324264, "How to Benchmark Code Execution Times on Intel" + * + * Consider getting exclusive ownership of CPU by using: + * unsigned long flags; + * preempt_disable(); + * raw_local_irq_save(flags); + * _your_code_ + * raw_local_irq_restore(flags); + * preempt_enable(); + * + * Clobbered registers: "%rax", "%rbx", "%rcx", "%rdx" + * RDTSC only change "%rax" and "%rdx" but + * CPUID clears the high 32-bits of all (rax/rbx/rcx/rdx) + */ +static __always_inline uint64_t tsc_start_clock(void) +{ + /* See: Intel Doc #324264 */ + unsigned hi, lo; + asm volatile("CPUID\n\t" + "RDTSC\n\t" + "mov %%edx, %0\n\t" + "mov %%eax, %1\n\t" + : "=r"(hi), "=r"(lo)::"%rax", "%rbx", "%rcx", "%rdx"); + //FIXME: on 32bit use clobbered %eax + %edx + return ((uint64_t)lo) | (((uint64_t)hi) << 32); +} + +static __always_inline uint64_t tsc_stop_clock(void) +{ + /* See: Intel Doc #324264 */ + unsigned hi, lo; + asm volatile("RDTSCP\n\t" + "mov %%edx, %0\n\t" + "mov %%eax, %1\n\t" + "CPUID\n\t" + : "=r"(hi), "=r"(lo)::"%rax", "%rbx", "%rcx", "%rdx"); + return ((uint64_t)lo) | (((uint64_t)hi) << 32); +} + +/* Notes for RDTSC and RDTSCP + * + * Hannes found out that __builtin_ia32_rdtsc and + * __builtin_ia32_rdtscp are undocumented available in gcc, so there + * is no need to write inline assembler functions for them any more. + * + * unsigned long long __builtin_ia32_rdtscp(unsigned int *foo); + * (where foo is set to: numa_node << 12 | cpu) + * and + * unsigned long long __builtin_ia32_rdtsc(void); + * + * Above we combine the calls with CPUID, thus I don't see how this is + * directly appreciable. + */ + +/* +inline uint64_t rdtsc(void) +{ + uint32_t low, high; + asm volatile("rdtsc" : "=a" (low), "=d" (high)); + return low | (((uint64_t )high ) << 32); +} +*/ + +/** Wall-clock based ** + * + * use: getnstimeofday() + * getnstimeofday(&rec->ts_start); + * getnstimeofday(&rec->ts_stop); + * + * API changed see: Documentation/core-api/timekeeping.rst + * https://www.kernel.org/doc/html/latest/core-api/timekeeping.html#c.getnstim… + * + * We should instead use: ktime_get_real_ts64() is a direct + * replacement, but consider using monotonic time (ktime_get_ts64()) + * and/or a ktime_t based interface (ktime_get()/ktime_get_real()). + */ + +/** PMU (Performance Monitor Unit) based ** + * + * Needed for calculating: Instructions Per Cycle (IPC) + * - The IPC number tell how efficient the CPU pipelining were + */ +//lookup: perf_event_create_kernel_counter() + +bool time_bench_PMU_config(bool enable); + +/* Raw reading via rdpmc() using fixed counters + * + * From: https://github.com/andikleen/simple-pmu + */ +enum { + FIXED_SELECT = (1U << 30), /* == 0x40000000 */ + FIXED_INST_RETIRED_ANY = 0, + FIXED_CPU_CLK_UNHALTED_CORE = 1, + FIXED_CPU_CLK_UNHALTED_REF = 2, +}; + +static __always_inline unsigned long long p_rdpmc(unsigned in) +{ + unsigned d, a; + + asm volatile("rdpmc" : "=d"(d), "=a"(a) : "c"(in) : "memory"); + return ((unsigned long long)d << 32) | a; +} + +/* These PMU counter needs to be enabled, but I don't have the + * configure code implemented. My current hack is running: + * sudo perf stat -e cycles:k -e instructions:k insmod lib/ring_queue_test.ko + */ +/* Reading all pipelined instruction */ +static __always_inline unsigned long long pmc_inst(void) +{ + return p_rdpmc(FIXED_SELECT | FIXED_INST_RETIRED_ANY); +} + +/* Reading CPU clock cycles */ +static __always_inline unsigned long long pmc_clk(void) +{ + return p_rdpmc(FIXED_SELECT | FIXED_CPU_CLK_UNHALTED_CORE); +} + +/* Raw reading via MSR rdmsr() is likely wrong + * FIXME: How can I know which raw MSR registers are conf for what? + */ +#define MSR_IA32_PCM0 0x400000C1 /* PERFCTR0 */ +#define MSR_IA32_PCM1 0x400000C2 /* PERFCTR1 */ +#define MSR_IA32_PCM2 0x400000C3 +static inline uint64_t msr_inst(unsigned long long *msr_result) +{ + return rdmsrl_safe(MSR_IA32_PCM0, msr_result); +} + +/** Generic functions ** + */ +bool time_bench_loop(uint32_t loops, int step, char *txt, void *data, + int (*func)(struct time_bench_record *rec, void *data)); +bool time_bench_calc_stats(struct time_bench_record *rec); + +void time_bench_run_concurrent( + uint32_t loops, int step, void *data, + const struct cpumask *mask, /* Support masking outsome CPUs*/ + struct time_bench_sync *sync, struct time_bench_cpu *cpu_tasks, + int (*func)(struct time_bench_record *record, void *data)); +void time_bench_print_stats_cpumask(const char *desc, + struct time_bench_cpu *cpu_tasks, + const struct cpumask *mask); + +//FIXME: use rec->flags to select measurement, should be MACRO +static __always_inline void time_bench_start(struct time_bench_record *rec) +{ + //getnstimeofday(&rec->ts_start); + ktime_get_real_ts64(&rec->ts_start); + if (rec->flags & TIME_BENCH_PMU) { + rec->pmc_inst_start = pmc_inst(); + rec->pmc_clk_start = pmc_clk(); + } + rec->tsc_start = tsc_start_clock(); +} + +static __always_inline void time_bench_stop(struct time_bench_record *rec, + uint64_t invoked_cnt) +{ + rec->tsc_stop = tsc_stop_clock(); + if (rec->flags & TIME_BENCH_PMU) { + rec->pmc_inst_stop = pmc_inst(); + rec->pmc_clk_stop = pmc_clk(); + } + //getnstimeofday(&rec->ts_stop); + ktime_get_real_ts64(&rec->ts_stop); + rec->invoked_cnt = invoked_cnt; +} + +#endif /* _LINUX_TIME_BENCH_H */ base-commit: ea15e046263b19e91ffd827645ae5dfa44ebd044 -- 2.49.0.1151.ga128411c76-goog

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[PATCH v5 00/29] iommufd: Add vIOMMU infrastructure (Part-4 HW QUEUE)

by Nicolin Chen

The vIOMMU object is designed to represent a slice of an IOMMU HW for its virtualization features shared with or passed to user space (a VM mostly) in a way of HW acceleration. This extended the HWPT-based design for more advanced virtualization feature. HW QUEUE introduced by this series as a part of the vIOMMU infrastructure represents a HW accelerated queue/buffer for VM to use exclusively, e.g. - NVIDIA's Virtual Command Queue - AMD vIOMMU's Command Buffer, Event Log Buffer, and PPR Log Buffer each of which allows its IOMMU HW to directly access a queue memory owned by a guest VM and allows a guest OS to control the HW queue direclty, to avoid VM Exit overheads to improve the performance. Introduce IOMMUFD_OBJ_HW_QUEUE and its pairing IOMMUFD_CMD_HW_QUEUE_ALLOC allowing VMM to forward the IOMMU-specific queue info, such as queue base address, size, and etc. Meanwhile, a guest-owned queue needs the guest kernel to control the queue by reading/writing its consumer and producer indexes, via MMIO acceses to the hardware MMIO registers. Introduce an mmap infrastructure for iommufd to support passing through a piece of MMIO region from the host physical address space to the guest physical address space. The mmap info (offset/ length) used by an mmap syscall must be pre-allocated and returned to the user space via an output driver-data during an IOMMUFD_CMD_HW_QUEUE_ALLOC call. Thus, it requires a driver-specific user data support in the vIOMMU allocation flow. As a real-world use case, this series implements a HW QUEUE support in the tegra241-cmdqv driver for VCMDQs on NVIDIA Grace CPU. In another word, it is also the Tegra CMDQV series Part-2 (user-space support), reworked from Previous RFCv1: https://lore.kernel.org/all/cover.1712978212.git.nicolinc@nvidia.com/ This enables the HW accelerated feature for NVIDIA Grace CPU. Compared to the standard SMMUv3 operating in the nested translation mode trapping CMDQ for TLBI and ATC_INV commands, this gives a huge performance improvement: 70% to 90% reductions of invalidation time were measured by various DMA unmap tests running in a guest OS. // Unmap latencies from "dma_map_benchmark -g @granule -t @threads", // by toggling "/sys/kernel/debug/iommu/tegra241_cmdqv/bypass_vcmdq" @granule | @threads | bypass_vcmdq=1 | bypass_vcmdq=0 4KB 1 35.7 us 5.3 us 16KB 1 41.8 us 6.8 us 64KB 1 68.9 us 9.9 us 128KB 1 109.0 us 12.6 us 256KB 1 187.1 us 18.0 us 4KB 2 96.9 us 6.8 us 16KB 2 97.8 us 7.5 us 64KB 2 151.5 us 10.7 us 128KB 2 257.8 us 12.7 us 256KB 2 443.0 us 17.9 us This is on Github: https://github.com/nicolinc/iommufd/commits/iommufd_hw_queue-v5 Paring QEMU branch for testing: https://github.com/nicolinc/qemu/commits/wip/for_iommufd_hw_queue-v5 Changelog v5 * Rebase on v6.15-rc6 * Add Reviewed-by from Jason and Kevin * Correct typos in kdoc and update commit logs * [iommufd] Add a cosmetic fix * [iommufd] Drop unused num_pfns * [iommufd] Drop unnecessary check * [iommufd] Reorder patch sequence * [iommufd] Use io_remap_pfn_range() * [iommufd] Use success oriented flow * [iommufd] Fix max_npages calculation * [iommufd] Add more selftest coverage * [iommufd] Drop redundant static_assert * [iommufd] Fix mmap pfn range validation * [iommufd] Reject unmap on pinned iovas * [iommufd] Drop redundant vm_flags_set() * [iommufd] Drop iommufd_struct_destroy() * [iommufd] Drop redundant queue iova test * [iommufd] Use "mmio_addr" and "mmio_pfn" * [iommufd] Rename to "nesting_parent_iova" * [iommufd] Make iopt_pin_pages call option * [iommufd] Add ictx comparison in depend() * [iommufd] Add iommufd_object_alloc_ucmd() * [iommufd] Move kcalloc() after validations * [iommufd] Replace ictx setting with WARN_ON * [iommufd] Make hw_info's type bidirectional * [smmu] Add supported_vsmmu_type in impl_ops * [smmu] Drop impl report in smmu vendor struct * [tegra] Add IOMMU_HW_INFO_TYPE_TEGRA241_CMDQV * [tegra] Replace "number of VINTFs" with a note * [tegra] Drop the redundant lvcmdq pointer setting * [tegra] Flag IOMMUFD_VIOMMU_FLAG_HW_QUEUE_READS_PA * [tegra] Use "vintf_alloc_vsid" for vdevice_alloc op v4 https://lore.kernel.org/all/cover.1746757630.git.nicolinc@nvidia.com/ * Rebase on v6.15-rc5 * Add Reviewed-by from Vasant * Rename "vQUEUE" to "HW QUEUE" * Use "offset" and "length" for all mmap-related variables * [iommufd] Use u64 for guest PA * [iommufd] Fix typo in uAPI doc * [iommufd] Rename immap_id to offset * [iommufd] Drop the partial-size mmap support * [iommufd] Do not replace WARN_ON with WARN_ON_ONCE * [iommufd] Use "u64 base_addr" for queue base address * [iommufd] Use u64 base_pfn/num_pfns for immap structure * [iommufd] Correct the size passed in to mtree_alloc_range() * [iommufd] Add IOMMUFD_VIOMMU_FLAG_HW_QUEUE_READS_PA to viommu_ops v3 https://lore.kernel.org/all/cover.1746139811.git.nicolinc@nvidia.com/ * Add Reviewed-by from Baolu, Pranjal, and Alok * Revise kdocs, uAPI docs, and commit logs * Rename "vCMDQ" back to "vQUEUE" for AMD cases * [tegra] Add tegra241_vcmdq_hw_flush_timeout() * [tegra] Rename vsmmu_alloc to alloc_vintf_user * [tegra] Use writel for SID replacement registers * [tegra] Move mmap removal call to vsmmu_destroy op * [tegra] Fix revert in tegra241_vintf_alloc_lvcmdq_user() * [iommufd] Replace "& ~PAGE_MASK" with PAGE_ALIGNED() * [iommufd] Add an object-type "owner" to immap structure * [iommufd] Drop the ictx input in the new for-driver APIs * [iommufd] Add iommufd_vma_ops to keep track of mmap lifecycle * [iommufd] Add viommu-based iommufd_viommu_alloc/destroy_mmap helpers * [iommufd] Rename iommufd_ctx_alloc/free_mmap to _iommufd_alloc/destroy_mmap v2 https://lore.kernel.org/all/cover.1745646960.git.nicolinc@nvidia.com/ * Add Reviewed-by from Jason * [smmu] Fix vsmmu initial value * [smmu] Support impl for hw_info * [tegra] Rename "slot" to "vsid" * [tegra] Update kdocs and commit logs * [tegra] Map/unmap LVCMDQ dynamically * [tegra] Refcount the previous LVCMDQ * [tegra] Return -EEXIST if LVCMDQ exists * [tegra] Simplify VINTF cleanup routine * [tegra] Use vmid and s2_domain in vsmmu * [tegra] Rename "mmap_pgoff" to "immap_id" * [tegra] Add more addr and length validation * [iommufd] Add more narrative to mmap's kdoc * [iommufd] Add iommufd_struct_depend/undepend() * [iommufd] Rename vcmdq_free op to vcmdq_destroy * [iommufd] Fix bug in iommu_copy_struct_to_user() * [iommufd] Drop is_io from iommufd_ctx_alloc_mmap() * [iommufd] Test the queue memory for its contiguity * [iommufd] Return -ENXIO if address or length fails * [iommufd] Do not change @min_last in mock_viommu_alloc() * [iommufd] Generalize TEGRA241_VCMDQ data in core structure * [iommufd] Add selftest coverage for IOMMUFD_CMD_VCMDQ_ALLOC * [iommufd] Add iopt_pin_pages() to prevent queue memory from unmapping v1 https://lore.kernel.org/all/cover.1744353300.git.nicolinc@nvidia.com/ Thanks Nicolin Nicolin Chen (29): iommufd: Apply obvious cosmetic fixes iommufd: Introduce iommufd_object_alloc_ucmd helper iommu: Apply the new iommufd_object_alloc_ucmd helper iommu: Add iommu_copy_struct_to_user helper iommu: Pass in a driver-level user data structure to viommu_alloc op iommufd/viommu: Allow driver-specific user data for a vIOMMU object iommufd/selftest: Support user_data in mock_viommu_alloc iommufd/selftest: Add coverage for viommu data iommufd: Do not unmap an owned iopt_area iommufd: Abstract iopt_pin_pages and iopt_unpin_pages helpers iommufd/driver: Let iommufd_viommu_alloc helper save ictx to viommu->ictx iommufd/viommu: Add driver-allocated vDEVICE support iommufd/viommu: Introduce IOMMUFD_OBJ_HW_QUEUE and its related struct iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE_ALLOC ioctl iommufd/driver: Add iommufd_hw_queue_depend/undepend() helpers iommufd/selftest: Add coverage for IOMMUFD_CMD_HW_QUEUE_ALLOC iommufd: Add mmap interface iommufd/selftest: Add coverage for the new mmap interface Documentation: userspace-api: iommufd: Update HW QUEUE iommu: Allow an input type in hw_info op iommufd: Allow an input data_type via iommu_hw_info iommufd/selftest: Update hw_info coverage for an input data_type iommu/arm-smmu-v3-iommufd: Add vsmmu_alloc impl op iommu/arm-smmu-v3-iommufd: Add hw_info to impl_ops iommu/tegra241-cmdqv: Use request_threaded_irq iommu/tegra241-cmdqv: Simplify deinit flow in tegra241_cmdqv_remove_vintf() iommu/tegra241-cmdqv: Do not statically map LVCMDQs iommu/tegra241-cmdqv: Add user-space use support iommu/tegra241-cmdqv: Add IOMMU_VEVENTQ_TYPE_TEGRA241_CMDQV support drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 28 +- drivers/iommu/iommufd/io_pagetable.h | 15 +- drivers/iommu/iommufd/iommufd_private.h | 41 +- drivers/iommu/iommufd/iommufd_test.h | 20 + include/linux/iommu.h | 53 +- include/linux/iommufd.h | 221 +++++++- include/uapi/linux/iommufd.h | 150 +++++- tools/testing/selftests/iommu/iommufd_utils.h | 91 +++- .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 33 +- .../iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 496 +++++++++++++++++- drivers/iommu/intel/iommu.c | 4 + drivers/iommu/iommufd/device.c | 137 +---- drivers/iommu/iommufd/driver.c | 97 ++++ drivers/iommu/iommufd/eventq.c | 14 +- drivers/iommu/iommufd/hw_pagetable.c | 6 +- drivers/iommu/iommufd/io_pagetable.c | 106 +++- drivers/iommu/iommufd/iova_bitmap.c | 1 - drivers/iommu/iommufd/main.c | 80 ++- drivers/iommu/iommufd/pages.c | 19 +- drivers/iommu/iommufd/selftest.c | 158 +++++- drivers/iommu/iommufd/viommu.c | 146 +++++- tools/testing/selftests/iommu/iommufd.c | 146 +++++- .../selftests/iommu/iommufd_fail_nth.c | 15 +- Documentation/userspace-api/iommufd.rst | 12 + 24 files changed, 1794 insertions(+), 295 deletions(-) -- 2.43.0

1 day, 9 hours

3
52
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[PATCH v2] rust: kunit: use crate-level mapping for `c_void`

by Jesung Yang

Use `kernel::ffi::c_void` instead of `core::ffi::c_void` for consistency and to centralize abstraction. Since `kernel::ffi::c_void` is a straightforward re-export of `core::ffi::c_void`, both are functionally equivalent. However, using `kernel::ffi::c_void` improves consistency across the kernel's Rust code and provides a unified reference point in case the definition ever needs to change, even if such a change is unlikely. Signed-off-by: Jesung Yang <y.j3ms.n(a)gmail.com> Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089/topic/x/near/52… --- So in sum, I believe it's reasonable to keep the diff unchanged... but I'm happy to adjust if you'd prefer a different approach. --- Changes in v2: - Add "Link" tag to the related discussion on Zulip - Reword the commit message to clarify `kernel::ffi::c_void` is a re-export - Link to v1: https://lore.kernel.org/rust-for-linux/20250526162429.1114862-1-y.j3ms.n@gm… --- rust/kernel/kunit.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs index 81833a687b75..bd6fc712dd79 100644 --- a/rust/kernel/kunit.rs +++ b/rust/kernel/kunit.rs @@ -6,7 +6,8 @@ //! //! Reference: <https://docs.kernel.org/dev-tools/kunit/index.html> -use core::{ffi::c_void, fmt}; +use core::fmt; +use kernel::ffi::c_void; /// Prints a KUnit error-level message. /// base-commit: f4daa80d6be7d3c55ca72a8e560afc4e21f886aa -- 2.39.5

1 day, 11 hours

3
2
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[PATCH] rust: replace length checks with match

by Tamir Duberstein

Use a match expression with slice patterns instead of length checks and indexing. The result is more idiomatic, which is a better example for future Rust code authors. Signed-off-by: Tamir Duberstein <tamird(a)gmail.com> --- scripts/rustdoc_test_gen.rs | 33 +++++++++++++++++---------------- 1 file changed, 17 insertions(+), 16 deletions(-) diff --git a/scripts/rustdoc_test_gen.rs b/scripts/rustdoc_test_gen.rs index 1ca253594d38..a3dc251221e0 100644 --- a/scripts/rustdoc_test_gen.rs +++ b/scripts/rustdoc_test_gen.rs @@ -85,24 +85,25 @@ fn find_candidates( } } - assert!( - valid_paths.len() > 0, - "No path candidates found for `{file}`. This is likely a bug in the build system, or some \ - files went away while compiling." - ); - - if valid_paths.len() > 1 { - eprintln!("Several path candidates found:"); - for path in valid_paths { - eprintln!(" {path:?}"); + match valid_paths.as_slice() { + [] => panic!( + "No path candidates found for `{file}`. This is likely a bug in the build system, or \ + some files went away while compiling." + ), + [valid_path] => { + valid_path.to_str().unwrap() + } + valid_paths => { + eprintln!("Several path candidates found:"); + for path in valid_paths { + eprintln!(" {path:?}"); + } + panic!( + "Several path candidates found for `{file}`, please resolve the ambiguity by \ + renaming a file or folder." + ); } - panic!( - "Several path candidates found for `{file}`, please resolve the ambiguity by renaming \ - a file or folder." - ); } - - valid_paths[0].to_str().unwrap() } fn main() { --- base-commit: bfc3cd87559bc593bb32bb1482f9cae3308b6398 change-id: 20250527-idiomatic-match-slice-26a79d100e4d Best regards, -- Tamir Duberstein <tamird(a)gmail.com>

1 day, 11 hours

3
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[PATCH next] tools/testing: Check correct variable in open_procmap()

by Dan Carpenter

Check if "procmap_out->fd" is negative instead of "procmap_out" (which is a pointer). Fixes: bd23f293a0d5 ("tools/testing: add PROCMAP_QUERY helper functions in mm self tests") Signed-off-by: Dan Carpenter <dan.carpenter(a)linaro.org> --- tools/testing/selftests/mm/vm_util.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 1357e2d6a7b6..61d7bf1f8c62 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -439,7 +439,7 @@ int open_procmap(pid_t pid, struct procmap_fd *procmap_out) sprintf(path, "/proc/%d/maps", pid); procmap_out->query.size = sizeof(procmap_out->query); procmap_out->fd = open(path, O_RDONLY); - if (procmap_out < 0) + if (procmap_out->fd < 0) ret = -errno; return ret; -- 2.47.2

1 day, 17 hours

2
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[PATCH net-next v9] selftests/vsock: add initial vmtest.sh for vsock

by Bobby Eshleman

This commit introduces a new vmtest.sh runner for vsock. It uses virtme-ng/qemu to run tests in a VM. The tests validate G2H, H2G, and loopback. The testing tools from tools/testing/vsock/ are reused. Currently, only vsock_test is used. VMCI and hyperv support is included in the config file to be built with the -b option, though not used in the tests. Only tested on x86. To run: $ make -C tools/testing/selftests TARGETS=vsock $ tools/testing/selftests/vsock/vmtest.sh or $ make -C tools/testing/selftests TARGETS=vsock run_tests Example runs (after make -C tools/testing/selftests TARGETS=vsock): $ ./tools/testing/selftests/vsock/vmtest.sh 1..3 ok 0 vm_server_host_client ok 1 vm_client_host_server ok 2 vm_loopback SUMMARY: PASS=3 SKIP=0 FAIL=0 Log: /tmp/vsock_vmtest_m7DI.log $ ./tools/testing/selftests/vsock/vmtest.sh vm_loopback 1..1 ok 0 vm_loopback SUMMARY: PASS=1 SKIP=0 FAIL=0 Log: /tmp/vsock_vmtest_a1IO.log $ mkdir -p ~/scratch $ make -C tools/testing/selftests install TARGETS=vsock INSTALL_PATH=~/scratch [... omitted ...] $ cd ~/scratch $ ./run_kselftest.sh TAP version 13 1..1 # timeout set to 300 # selftests: vsock: vmtest.sh # 1..3 # ok 0 vm_server_host_client # ok 1 vm_client_host_server # ok 2 vm_loopback # SUMMARY: PASS=3 SKIP=0 FAIL=0 # Log: /tmp/vsock_vmtest_svEl.log ok 1 selftests: vsock: vmtest.sh Future work can include vsock_diag_test. Because vsock requires a VM to test anything other than loopback, this patch adds vmtest.sh as a kselftest itself. This is different than other systems that have a "vmtest.sh", where it is used as a utility script to spin up a VM to run the selftests as a guest (but isn't hooked into kselftest). Signed-off-by: Bobby Eshleman <bobbyeshleman(a)gmail.com> --- Changes in v9: - make kselftest build target depend on tools/testing/vsock sources (Stefano) - add check_vng() for vng version checking (Stefano) - add virtme_ssh_channel=tcp to kernel cmdline (Stefano) - Link to v8: https://lore.kernel.org/r/20250522-vsock-vmtest-v8-1-367619bef134@gmail.com Changes in v8: - remove NIPA comment from commit msg - remove tap_* functions and TAP_PREFIX - add -b for building kernel - Link to v7: https://lore.kernel.org/r/20250515-vsock-vmtest-v7-1-ba6fa86d6c2c@gmail.com Changes in v7: - fix exit code bug when ran is kselftest: use cnt_total instead of KSFT_NUM_TESTS - updated commit message with updated output - updated commit message with commands for installing/running as kselftest - Link to v6: https://lore.kernel.org/r/20250515-vsock-vmtest-v6-1-9af1cc023900@gmail.com Changes in v6: - add make cmd in commit message in vmtest.sh example (Stefano) - check nonzero size of QEMU_PIDFILE using -s conditional (Stefano) - display log file path after tests so it is easier to find amongst other random names - cleanup qemu pidfile if qemu is unable to remove it - make oops/warning failures more obvious with 'FAIL' prefix in log (simply saying 'detected' wasn't clear enough to identify failing condition) - Link to v5: https://lore.kernel.org/r/20250513-vsock-vmtest-v5-1-4e75c4a45ceb@gmail.com Changes in v5: - make log file a tmpfile (Paolo) - make sure both default and user defined QEMU gets handled by the dependency check (Paolo) - increased VM boot up timeout from 1m to 3m for slow hosts (Paolo) - rename vm_setup -> vm_start (Paolo) - derive wait_for_listener from selftests/net/net_helper.sh to removes ss usage - Remove unused 'unset IFS' line (Paolo) - leave space after variable declarations (Paolo) - make QEMU_PIDFILE a tmp file (Paolo) - make everything readonly that is only read (Paolo) - source ktap_helpers.sh for KSFT_PASS and friends (Paolo) - don't check for timeout util (Paolo) - add missing usage string for -q qemu arg - add tap prefix to SUMMARY line since it isn't part of TAP protocol - exit with the correct status code based on failure/pass counts - Link to v4: https://lore.kernel.org/r/20250507-vsock-vmtest-v4-1-6e2a97262cd6@gmail.com Changes in v4: - do not use special tab delimiter for help string parsing (Stefano + Paolo) - fix paths for when installing kselftest and running out-of-tree (Paolo) - change vng to using running kernel instead of compiled kernel (Paolo) - use multi-line string for QEMU_OPTS (Stefano) - change timeout to 300s (Paolo) - skip if tools are not found and use kselftests status codes (Paolo) - remove build from vmtest.sh (Paolo) - change 2222 -> SSH_HOST_PORT (Stefano) - add tap-format output - add vmtest.log to gitignore - check for vsock_test binary and remind user to build it if missing - create a proper build in makefile - style fixes - add ssh, timeout, and pkill to dependency check, just in case - fix numerical comparison in conditionals - check qemu pidfile exists before proceeding (avoid wasting time waiting for ssh) - fix tracking of pass/fail bug - fix stderr redirection bug - Link to v3: https://lore.kernel.org/r/20250428-vsock-vmtest-v3-1-181af6163f3e@gmail.com Changes in v3: - use common conditional syntax for checking variables - use return value instead of global rc - fix typo TEST_HOST_LISTENER_PORT -> TEST_HOST_PORT_LISTENER - use SIGTERM instead of SIGKILL on cleanup - use peer-cid=1 for loopback - change sleep delay times into globals - fix test_vm_loopback logging - add test selection in arguments - make QEMU an argument - check that vng binary is on path - use QEMU variable - change <tab><backslash> to <space><backslash> - fix hardcoded file paths - add comment in commit msg about script that vmtest.sh was based off of - Add tools/testing/selftest/vsock/Makefile for kselftest - Link to v2: https://lore.kernel.org/r/20250417-vsock-vmtest-v2-1-3901a27331e8@gmail.com Changes in v2: - add kernel oops and warnings checker - change testname variable to use FUNCNAME - fix spacing in test_vm_server_host_client - add -s skip build option to vmtest.sh - add test_vm_loopback - pass port to vm_wait_for_listener - fix indentation in vmtest.sh - add vmci and hyperv to config - changed whitespace from tabs to spaces in help string - Link to v1: https://lore.kernel.org/r/20250410-vsock-vmtest-v1-1-f35a81dab98c@gmail.com --- MAINTAINERS | 1 + tools/testing/selftests/vsock/.gitignore | 2 + tools/testing/selftests/vsock/Makefile | 17 ++ tools/testing/selftests/vsock/config | 114 ++++++++ tools/testing/selftests/vsock/settings | 1 + tools/testing/selftests/vsock/vmtest.sh | 487 +++++++++++++++++++++++++++++++ 6 files changed, 622 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 657a67f9031ef7798c19ac63e6383d4cb18a9e1f..3fbdd7bbfce7196a3cc7db70203317c6bd0e51fd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -25751,6 +25751,7 @@ F: include/uapi/linux/vm_sockets.h F: include/uapi/linux/vm_sockets_diag.h F: include/uapi/linux/vsockmon.h F: net/vmw_vsock/ +F: tools/testing/selftests/vsock/ F: tools/testing/vsock/ VMALLOC diff --git a/tools/testing/selftests/vsock/.gitignore b/tools/testing/selftests/vsock/.gitignore new file mode 100644 index 0000000000000000000000000000000000000000..9c5bf379480f829a14713d5f5dc7d525bc272e84 --- /dev/null +++ b/tools/testing/selftests/vsock/.gitignore @@ -0,0 +1,2 @@ +vmtest.log +vsock_test diff --git a/tools/testing/selftests/vsock/Makefile b/tools/testing/selftests/vsock/Makefile new file mode 100644 index 0000000000000000000000000000000000000000..c407c0afd9388ee692d59a95f304182f067596e9 --- /dev/null +++ b/tools/testing/selftests/vsock/Makefile @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0 + +CURDIR := $(abspath .) +TOOLSDIR := $(abspath ../../..) +VSOCK_TEST_DIR := $(TOOLSDIR)/testing/vsock +VSOCK_TEST_SRCS := $(wildcard $(VSOCK_TEST_DIR)/*.c $(VSOCK_TEST_DIR)/*.h) + +$(OUTPUT)/vsock_test: $(VSOCK_TEST_DIR)/vsock_test + install -m 755 $< $@ + +$(VSOCK_TEST_DIR)/vsock_test: $(VSOCK_TEST_SRCS) + $(MAKE) -C $(VSOCK_TEST_DIR) vsock_test +TEST_PROGS += vmtest.sh +TEST_GEN_FILES := vsock_test + +include ../lib.mk + diff --git a/tools/testing/selftests/vsock/config b/tools/testing/selftests/vsock/config new file mode 100644 index 0000000000000000000000000000000000000000..3bffaaf98fff92dc0e3bc1286afa3d8d5d52f4c7 --- /dev/null +++ b/tools/testing/selftests/vsock/config @@ -0,0 +1,114 @@ +CONFIG_BLK_DEV_INITRD=y +CONFIG_BPF=y +CONFIG_BPF_SYSCALL=y +CONFIG_BPF_JIT=y +CONFIG_HAVE_EBPF_JIT=y +CONFIG_BPF_EVENTS=y +CONFIG_FTRACE_SYSCALLS=y +CONFIG_FUNCTION_TRACER=y +CONFIG_HAVE_DYNAMIC_FTRACE=y +CONFIG_DYNAMIC_FTRACE=y +CONFIG_HAVE_KPROBES=y +CONFIG_KPROBES=y +CONFIG_KPROBE_EVENTS=y +CONFIG_ARCH_SUPPORTS_UPROBES=y +CONFIG_UPROBES=y +CONFIG_UPROBE_EVENTS=y +CONFIG_DEBUG_FS=y +CONFIG_FW_CFG_SYSFS=y +CONFIG_FW_CFG_SYSFS_CMDLINE=y +CONFIG_DRM=y +CONFIG_DRM_VIRTIO_GPU=y +CONFIG_DRM_VIRTIO_GPU_KMS=y +CONFIG_DRM_BOCHS=y +CONFIG_VIRTIO_IOMMU=y +CONFIG_SOUND=y +CONFIG_SND=y +CONFIG_SND_SEQUENCER=y +CONFIG_SND_PCI=y +CONFIG_SND_INTEL8X0=y +CONFIG_SND_HDA_CODEC_REALTEK=y +CONFIG_SECURITYFS=y +CONFIG_CGROUP_BPF=y +CONFIG_SQUASHFS=y +CONFIG_SQUASHFS_XZ=y +CONFIG_SQUASHFS_ZSTD=y +CONFIG_FUSE_FS=y +CONFIG_SERIO=y +CONFIG_PCI=y +CONFIG_INPUT=y +CONFIG_INPUT_KEYBOARD=y +CONFIG_KEYBOARD_ATKBD=y +CONFIG_SERIAL_8250=y +CONFIG_SERIAL_8250_CONSOLE=y +CONFIG_X86_VERBOSE_BOOTUP=y +CONFIG_VGA_CONSOLE=y +CONFIG_FB=y +CONFIG_FB_VESA=y +CONFIG_FRAMEBUFFER_CONSOLE=y +CONFIG_RTC_CLASS=y +CONFIG_RTC_HCTOSYS=y +CONFIG_RTC_DRV_CMOS=y +CONFIG_HYPERVISOR_GUEST=y +CONFIG_PARAVIRT=y +CONFIG_KVM_GUEST=y +CONFIG_KVM=y +CONFIG_KVM_INTEL=y +CONFIG_KVM_AMD=y +CONFIG_VSOCKETS=y +CONFIG_VSOCKETS_DIAG=y +CONFIG_VSOCKETS_LOOPBACK=y +CONFIG_VMWARE_VMCI_VSOCKETS=y +CONFIG_VIRTIO_VSOCKETS=y +CONFIG_VIRTIO_VSOCKETS_COMMON=y +CONFIG_HYPERV_VSOCKETS=y +CONFIG_VMWARE_VMCI=y +CONFIG_VHOST_VSOCK=y +CONFIG_HYPERV=y +CONFIG_UEVENT_HELPER=n +CONFIG_VIRTIO=y +CONFIG_VIRTIO_PCI=y +CONFIG_VIRTIO_MMIO=y +CONFIG_VIRTIO_BALLOON=y +CONFIG_NET=y +CONFIG_NET_CORE=y +CONFIG_NETDEVICES=y +CONFIG_NETWORK_FILESYSTEMS=y +CONFIG_INET=y +CONFIG_NET_9P=y +CONFIG_NET_9P_VIRTIO=y +CONFIG_9P_FS=y +CONFIG_VIRTIO_NET=y +CONFIG_CMDLINE_OVERRIDE=n +CONFIG_BINFMT_SCRIPT=y +CONFIG_SHMEM=y +CONFIG_TMPFS=y +CONFIG_UNIX=y +CONFIG_MODULE_SIG_FORCE=n +CONFIG_DEVTMPFS=y +CONFIG_TTY=y +CONFIG_VT=y +CONFIG_UNIX98_PTYS=y +CONFIG_EARLY_PRINTK=y +CONFIG_INOTIFY_USER=y +CONFIG_BLOCK=y +CONFIG_SCSI_LOWLEVEL=y +CONFIG_SCSI=y +CONFIG_SCSI_VIRTIO=y +CONFIG_BLK_DEV_SD=y +CONFIG_VIRTIO_CONSOLE=y +CONFIG_WATCHDOG=y +CONFIG_WATCHDOG_CORE=y +CONFIG_I6300ESB_WDT=y +CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y +CONFIG_OVERLAY_FS=y +CONFIG_DAX=y +CONFIG_DAX_DRIVER=y +CONFIG_FS_DAX=y +CONFIG_MEMORY_HOTPLUG=y +CONFIG_MEMORY_HOTREMOVE=y +CONFIG_ZONE_DEVICE=y +CONFIG_FUSE_FS=y +CONFIG_VIRTIO_FS=y +CONFIG_VSOCKETS=y +CONFIG_VIRTIO_VSOCKETS=y diff --git a/tools/testing/selftests/vsock/settings b/tools/testing/selftests/vsock/settings new file mode 100644 index 0000000000000000000000000000000000000000..694d70710ff08ac9fc91e9ecb5dbdadcf051f019 --- /dev/null +++ b/tools/testing/selftests/vsock/settings @@ -0,0 +1 @@ +timeout=300 diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh new file mode 100755 index 0000000000000000000000000000000000000000..edacebfc163251eee9cd495eb5e704dc7adc958e --- /dev/null +++ b/tools/testing/selftests/vsock/vmtest.sh @@ -0,0 +1,487 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (c) 2025 Meta Platforms, Inc. and affiliates +# +# Dependencies: +# * virtme-ng +# * busybox-static (used by virtme-ng) +# * qemu (used by virtme-ng) + +readonly SCRIPT_DIR="$(cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)" +readonly KERNEL_CHECKOUT=$(realpath "${SCRIPT_DIR}"/../../../../) + +source "${SCRIPT_DIR}"/../kselftest/ktap_helpers.sh + +readonly VSOCK_TEST="${SCRIPT_DIR}"/vsock_test +readonly TEST_GUEST_PORT=51000 +readonly TEST_HOST_PORT=50000 +readonly TEST_HOST_PORT_LISTENER=50001 +readonly SSH_GUEST_PORT=22 +readonly SSH_HOST_PORT=2222 +readonly VSOCK_CID=1234 +readonly WAIT_PERIOD=3 +readonly WAIT_PERIOD_MAX=60 +readonly WAIT_TOTAL=$(( WAIT_PERIOD * WAIT_PERIOD_MAX )) +readonly QEMU_PIDFILE=$(mktemp /tmp/qemu_vsock_vmtest_XXXX.pid) + +# virtme-ng offers a netdev for ssh when using "--ssh", but we also need a +# control port forwarded for vsock_test. Because virtme-ng doesn't support +# adding an additional port to forward to the device created from "--ssh" and +# virtme-init mistakenly sets identical IPs to the ssh device and additional +# devices, we instead opt out of using --ssh, add the device manually, and also +# add the kernel cmdline options that virtme-init uses to setup the interface. +readonly QEMU_TEST_PORT_FWD="hostfwd=tcp::${TEST_HOST_PORT}-:${TEST_GUEST_PORT}" +readonly QEMU_SSH_PORT_FWD="hostfwd=tcp::${SSH_HOST_PORT}-:${SSH_GUEST_PORT}" +readonly QEMU_OPTS="\ + -netdev user,id=n0,${QEMU_TEST_PORT_FWD},${QEMU_SSH_PORT_FWD} \ + -device virtio-net-pci,netdev=n0 \ + -device vhost-vsock-pci,guest-cid=${VSOCK_CID} \ + --pidfile ${QEMU_PIDFILE} \ +" +readonly KERNEL_CMDLINE="\ + virtme.dhcp net.ifnames=0 biosdevname=0 \ + virtme.ssh virtme_ssh_channel=tcp virtme_ssh_user=$USER \ +" +readonly LOG=$(mktemp /tmp/vsock_vmtest_XXXX.log) +readonly TEST_NAMES=(vm_server_host_client vm_client_host_server vm_loopback) +readonly TEST_DESCS=( + "Run vsock_test in server mode on the VM and in client mode on the host." + "Run vsock_test in client mode on the VM and in server mode on the host." + "Run vsock_test using the loopback transport in the VM." +) + +VERBOSE=0 + +usage() { + local name + local desc + local i + + echo + echo "$0 [OPTIONS] [TEST]..." + echo "If no TEST argument is given, all tests will be run." + echo + echo "Options" + echo " -b: build the kernel from the current source tree and use it for guest VMs" + echo " -q: set the path to or name of qemu binary" + echo " -v: verbose output" + echo + echo "Available tests" + + for ((i = 0; i < ${#TEST_NAMES[@]}; i++)); do + name=${TEST_NAMES[${i}]} + desc=${TEST_DESCS[${i}]} + printf "\t%-35s%-35s\n" "${name}" "${desc}" + done + echo + + exit 1 +} + +die() { + echo "$*" >&2 + exit "${KSFT_FAIL}" +} + +vm_ssh() { + ssh -q -o UserKnownHostsFile=/dev/null -p ${SSH_HOST_PORT} localhost "$@" + return $? +} + +cleanup() { + if [[ -s "${QEMU_PIDFILE}" ]]; then + pkill -SIGTERM -F "${QEMU_PIDFILE}" > /dev/null 2>&1 + fi + + # If failure occurred during or before qemu start up, then we need + # to clean this up ourselves. + if [[ -e "${QEMU_PIDFILE}" ]]; then + rm "${QEMU_PIDFILE}" + fi +} + +check_args() { + local found + + for arg in "$@"; do + found=0 + for name in "${TEST_NAMES[@]}"; do + if [[ "${name}" = "${arg}" ]]; then + found=1 + break + fi + done + + if [[ "${found}" -eq 0 ]]; then + echo "${arg} is not an available test" >&2 + usage + fi + done + + for arg in "$@"; do + if ! command -v > /dev/null "test_${arg}"; then + echo "Test ${arg} not found" >&2 + usage + fi + done +} + +check_deps() { + for dep in vng ${QEMU} busybox pkill ssh; do + if [[ ! -x $(command -v "${dep}") ]]; then + echo -e "skip: dependency ${dep} not found!\n" + exit "${KSFT_SKIP}" + fi + done + + if [[ ! -x $(command -v "${VSOCK_TEST}") ]]; then + printf "skip: %s not found!" "${VSOCK_TEST}" + printf " Please build the kselftest vsock target.\n" + exit "${KSFT_SKIP}" + fi +} + +check_vng() { + local tested_versions + local version + local ok + + tested_versions=("1.33" "1.36") + version="$(vng --version)" + + ok=0 + for tv in "${tested_versions[@]}"; do + if [[ "${version}" == *"${tv}"* ]]; then + ok=1 + break + fi + done + + if [[ ! "${ok}" -eq 1 ]]; then + printf "warning: vng version '%s' has not been tested and may " "${version}" >&2 + printf "not function properly.\n\tThe following versions have been tested: " >&2 + echo "${tested_versions[@]}" >&2 + fi +} + +handle_build() { + if [[ ! "${BUILD}" -eq 1 ]]; then + return + fi + + if [[ ! -d "${KERNEL_CHECKOUT}" ]]; then + echo "-b requires vmtest.sh called from the kernel source tree" >&2 + exit 1 + fi + + pushd "${KERNEL_CHECKOUT}" &>/dev/null + + if ! vng --kconfig --config "${SCRIPT_DIR}"/config; then + die "failed to generate .config for kernel source tree (${KERNEL_CHECKOUT})" + fi + + if ! make -j$(nproc); then + die "failed to build kernel from source tree (${KERNEL_CHECKOUT})" + fi + + popd &>/dev/null +} + +vm_start() { + local logfile=/dev/null + local verbose_opt="" + local kernel_opt="" + local qemu + + qemu=$(command -v "${QEMU}") + + if [[ "${VERBOSE}" -eq 1 ]]; then + verbose_opt="--verbose" + logfile=/dev/stdout + fi + + if [[ "${BUILD}" -eq 1 ]]; then + kernel_opt="${KERNEL_CHECKOUT}" + fi + + vng \ + --run \ + ${kernel_opt} \ + ${verbose_opt} \ + --qemu-opts="${QEMU_OPTS}" \ + --qemu="${qemu}" \ + --user root \ + --append "${KERNEL_CMDLINE}" \ + --rw &> ${logfile} & + + if ! timeout ${WAIT_TOTAL} \ + bash -c 'while [[ ! -s '"${QEMU_PIDFILE}"' ]]; do sleep 1; done; exit 0'; then + die "failed to boot VM" + fi +} + +vm_wait_for_ssh() { + local i + + i=0 + while true; do + if [[ ${i} -gt ${WAIT_PERIOD_MAX} ]]; then + die "Timed out waiting for guest ssh" + fi + if vm_ssh -- true; then + break + fi + i=$(( i + 1 )) + sleep ${WAIT_PERIOD} + done +} + +# derived from selftests/net/net_helper.sh +wait_for_listener() +{ + local port=$1 + local interval=$2 + local max_intervals=$3 + local protocol=tcp + local pattern + local i + + pattern=":$(printf "%04X" "${port}") " + + # for tcp protocol additionally check the socket state + [ "${protocol}" = "tcp" ] && pattern="${pattern}0A" + for i in $(seq "${max_intervals}"); do + if awk '{print $2" "$4}' /proc/net/"${protocol}"* | \ + grep -q "${pattern}"; then + break + fi + sleep "${interval}" + done +} + +vm_wait_for_listener() { + local port=$1 + + vm_ssh <<EOF +$(declare -f wait_for_listener) +wait_for_listener ${port} ${WAIT_PERIOD} ${WAIT_PERIOD_MAX} +EOF +} + +host_wait_for_listener() { + wait_for_listener "${TEST_HOST_PORT_LISTENER}" "${WAIT_PERIOD}" "${WAIT_PERIOD_MAX}" +} + +__log_stdin() { + cat | awk '{ printf "%s:\t%s\n","'"${prefix}"'", $0 }' +} + +__log_args() { + echo "$*" | awk '{ printf "%s:\t%s\n","'"${prefix}"'", $0 }' +} + +log() { + local prefix="$1" + + shift + local redirect= + if [[ ${VERBOSE} -eq 0 ]]; then + redirect=/dev/null + else + redirect=/dev/stdout + fi + + if [[ "$#" -eq 0 ]]; then + __log_stdin | tee -a "${LOG}" > ${redirect} + else + __log_args "$@" | tee -a "${LOG}" > ${redirect} + fi +} + +log_setup() { + log "setup" "$@" +} + +log_host() { + local testname=$1 + + shift + log "test:${testname}:host" "$@" +} + +log_guest() { + local testname=$1 + + shift + log "test:${testname}:guest" "$@" +} + +test_vm_server_host_client() { + local testname="${FUNCNAME[0]#test_}" + + vm_ssh -- "${VSOCK_TEST}" \ + --mode=server \ + --control-port="${TEST_GUEST_PORT}" \ + --peer-cid=2 \ + 2>&1 | log_guest "${testname}" & + + vm_wait_for_listener "${TEST_GUEST_PORT}" + + ${VSOCK_TEST} \ + --mode=client \ + --control-host=127.0.0.1 \ + --peer-cid="${VSOCK_CID}" \ + --control-port="${TEST_HOST_PORT}" 2>&1 | log_host "${testname}" + + return $? +} + +test_vm_client_host_server() { + local testname="${FUNCNAME[0]#test_}" + + ${VSOCK_TEST} \ + --mode "server" \ + --control-port "${TEST_HOST_PORT_LISTENER}" \ + --peer-cid "${VSOCK_CID}" 2>&1 | log_host "${testname}" & + + host_wait_for_listener + + vm_ssh -- "${VSOCK_TEST}" \ + --mode=client \ + --control-host=10.0.2.2 \ + --peer-cid=2 \ + --control-port="${TEST_HOST_PORT_LISTENER}" 2>&1 | log_guest "${testname}" + + return $? +} + +test_vm_loopback() { + local testname="${FUNCNAME[0]#test_}" + local port=60000 # non-forwarded local port + + vm_ssh -- "${VSOCK_TEST}" \ + --mode=server \ + --control-port="${port}" \ + --peer-cid=1 2>&1 | log_guest "${testname}" & + + vm_wait_for_listener "${port}" + + vm_ssh -- "${VSOCK_TEST}" \ + --mode=client \ + --control-host="127.0.0.1" \ + --control-port="${port}" \ + --peer-cid=1 2>&1 | log_guest "${testname}" + + return $? +} + +run_test() { + local host_oops_cnt_before + local host_warn_cnt_before + local vm_oops_cnt_before + local vm_warn_cnt_before + local host_oops_cnt_after + local host_warn_cnt_after + local vm_oops_cnt_after + local vm_warn_cnt_after + local name + local rc + + host_oops_cnt_before=$(dmesg | grep -c -i 'Oops') + host_warn_cnt_before=$(dmesg --level=warn | wc -l) + vm_oops_cnt_before=$(vm_ssh -- dmesg | grep -c -i 'Oops') + vm_warn_cnt_before=$(vm_ssh -- dmesg --level=warn | wc -l) + + name=$(echo "${1}" | awk '{ print $1 }') + eval test_"${name}" + rc=$? + + host_oops_cnt_after=$(dmesg | grep -i 'Oops' | wc -l) + if [[ ${host_oops_cnt_after} -gt ${host_oops_cnt_before} ]]; then + echo "FAIL: kernel oops detected on host" | log_host "${name}" + rc=$KSFT_FAIL + fi + + host_warn_cnt_after=$(dmesg --level=warn | wc -l) + if [[ ${host_warn_cnt_after} -gt ${host_warn_cnt_before} ]]; then + echo "FAIL: kernel warning detected on host" | log_host "${name}" + rc=$KSFT_FAIL + fi + + vm_oops_cnt_after=$(vm_ssh -- dmesg | grep -i 'Oops' | wc -l) + if [[ ${vm_oops_cnt_after} -gt ${vm_oops_cnt_before} ]]; then + echo "FAIL: kernel oops detected on vm" | log_host "${name}" + rc=$KSFT_FAIL + fi + + vm_warn_cnt_after=$(vm_ssh -- dmesg --level=warn | wc -l) + if [[ ${vm_warn_cnt_after} -gt ${vm_warn_cnt_before} ]]; then + echo "FAIL: kernel warning detected on vm" | log_host "${name}" + rc=$KSFT_FAIL + fi + + return "${rc}" +} + +QEMU="qemu-system-$(uname -m)" + +while getopts :hvsq:b o +do + case $o in + v) VERBOSE=1;; + b) BUILD=1;; + q) QEMU=$OPTARG;; + h|*) usage;; + esac +done +shift $((OPTIND-1)) + +trap cleanup EXIT + +if [[ ${#} -eq 0 ]]; then + ARGS=("${TEST_NAMES[@]}") +else + ARGS=("$@") +fi + +check_args "${ARGS[@]}" +check_deps +check_vng +handle_build + +echo "1..${#ARGS[@]}" + +log_setup "Booting up VM" +vm_start +vm_wait_for_ssh +log_setup "VM booted up" + +cnt_pass=0 +cnt_fail=0 +cnt_skip=0 +cnt_total=0 +for arg in "${ARGS[@]}"; do + run_test "${arg}" + rc=$? + if [[ ${rc} -eq $KSFT_PASS ]]; then + cnt_pass=$(( cnt_pass + 1 )) + echo "ok ${cnt_total} ${arg}" + elif [[ ${rc} -eq $KSFT_SKIP ]]; then + cnt_skip=$(( cnt_skip + 1 )) + echo "ok ${cnt_total} ${arg} # SKIP" + elif [[ ${rc} -eq $KSFT_FAIL ]]; then + cnt_fail=$(( cnt_fail + 1 )) + echo "not ok ${cnt_total} ${arg} # exit=$rc" + fi + cnt_total=$(( cnt_total + 1 )) +done + +echo "SUMMARY: PASS=${cnt_pass} SKIP=${cnt_skip} FAIL=${cnt_fail}" +echo "Log: ${LOG}" + +if [ $((cnt_pass + cnt_skip)) -eq ${cnt_total} ]; then + exit "$KSFT_PASS" +else + exit "$KSFT_FAIL" +fi --- base-commit: 8066e388be48f1ad62b0449dc1d31a25489fa12a change-id: 20250325-vsock-vmtest-b3a21d2102c2 Best regards, -- Bobby Eshleman <bobbyeshleman(a)gmail.com>

1 day, 19 hours

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[bug report] selftests/landlock: Add tests for audit flags and domain IDs

by Dan Carpenter

Hello Mickaël Salaün, Commit 6a500b22971c ("selftests/landlock: Add tests for audit flags and domain IDs") from Mar 20, 2025 (linux-next), leads to the following Smatch static checker warning: tools/testing/selftests/landlock/audit.h:408 audit_init_filter_exe() warn: unsigned 'filter->exe_len' is never less than zero. tools/testing/selftests/landlock/audit.h 399 static int audit_init_filter_exe(struct audit_filter *filter, const char *path) 400 { 401 char *absolute_path = NULL; 402 403 /* It is assume that there is not already filtering rules. */ 404 filter->record_type = AUDIT_EXE; 405 if (!path) { 406 filter->exe_len = readlink("/proc/self/exe", filter->exe, 407 sizeof(filter->exe) - 1); --> 408 if (filter->exe_len < 0) size_t can't be negative. 409 return -errno; 410 411 return 0; 412 } 413 414 absolute_path = realpath(path, NULL); 415 if (!absolute_path) 416 return -errno; 417 418 /* No need for the terminating NULL byte. */ 419 filter->exe_len = strlen(absolute_path); 420 if (filter->exe_len > sizeof(filter->exe)) 421 return -E2BIG; 422 423 memcpy(filter->exe, absolute_path, filter->exe_len); 424 free(absolute_path); 425 return 0; 426 } regards, dan carpenter

1 day, 19 hours

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