June 2025 - Linux-kselftest-mirror

[PATCH v3 1/2] libbpf: add support for printing BTF character arrays as strings

by Blake Jones

The BTF dumper code currently displays arrays of characters as just that - arrays, with each character formatted individually. Sometimes this is what makes sense, but it's nice to be able to treat that array as a string. This change adds a special case to the btf_dump functionality to allow 0-terminated arrays of single-byte integer values to be printed as character strings. Characters for which isprint() returns false are printed as hex-escaped values. This is enabled when the new ".emit_strings" is set to 1 in the btf_dump_type_data_opts structure. As an example, here's what it looks like to dump the string "hello" using a few different field values for btf_dump_type_data_opts (.compact = 1): - .emit_strings = 0, .skip_names = 0: (char[6])['h','e','l','l','o',] - .emit_strings = 0, .skip_names = 1: ['h','e','l','l','o',] - .emit_strings = 1, .skip_names = 0: (char[6])"hello" - .emit_strings = 1, .skip_names = 1: "hello" Here's the string "h\xff", dumped with .compact = 1 and .skip_names = 1: - .emit_strings = 0: ['h',-1,] - .emit_strings = 1: "h\xff" Signed-off-by: Blake Jones <blakejones(a)google.com> --- tools/lib/bpf/btf.h | 3 ++- tools/lib/bpf/btf_dump.c | 55 +++++++++++++++++++++++++++++++++++++++- 2 files changed, 56 insertions(+), 2 deletions(-) diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h index 4392451d634b..ccfd905f03df 100644 --- a/tools/lib/bpf/btf.h +++ b/tools/lib/bpf/btf.h @@ -326,9 +326,10 @@ struct btf_dump_type_data_opts { bool compact; /* no newlines/indentation */ bool skip_names; /* skip member/type names */ bool emit_zeroes; /* show 0-valued fields */ + bool emit_strings; /* print char arrays as strings */ size_t :0; }; -#define btf_dump_type_data_opts__last_field emit_zeroes +#define btf_dump_type_data_opts__last_field emit_strings LIBBPF_API int btf_dump__dump_type_data(struct btf_dump *d, __u32 id, diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index 460c3e57fadb..7c2f1f13f958 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -68,6 +68,7 @@ struct btf_dump_data { bool compact; bool skip_names; bool emit_zeroes; + bool emit_strings; __u8 indent_lvl; /* base indent level */ char indent_str[BTF_DATA_INDENT_STR_LEN]; /* below are used during iteration */ @@ -2028,6 +2029,52 @@ static int btf_dump_var_data(struct btf_dump *d, return btf_dump_dump_type_data(d, NULL, t, type_id, data, 0, 0); } +static int btf_dump_string_data(struct btf_dump *d, + const struct btf_type *t, + __u32 id, + const void *data) +{ + const struct btf_array *array = btf_array(t); + const char *chars = data; + __u32 i; + + /* Make sure it is a NUL-terminated string. */ + for (i = 0; i < array->nelems; i++) { + if ((void *)(chars + i) >= d->typed_dump->data_end) + return -E2BIG; + if (chars[i] == '\0') + break; + } + if (i == array->nelems) { + /* The caller will print this as a regular array. */ + return -EINVAL; + } + + btf_dump_data_pfx(d); + btf_dump_printf(d, "\""); + + for (i = 0; i < array->nelems; i++) { + char c = chars[i]; + + if (c == '\0') { + /* + * When printing character arrays as strings, NUL bytes + * are always treated as string terminators; they are + * never printed. + */ + break; + } + if (isprint(c)) + btf_dump_printf(d, "%c", c); + else + btf_dump_printf(d, "\\x%02x", (__u8)c); + } + + btf_dump_printf(d, "\""); + + return 0; +} + static int btf_dump_array_data(struct btf_dump *d, const struct btf_type *t, __u32 id, @@ -2055,8 +2102,13 @@ static int btf_dump_array_data(struct btf_dump *d, * char arrays, so if size is 1 and element is * printable as a char, we'll do that. */ - if (elem_size == 1) + if (elem_size == 1) { + if (d->typed_dump->emit_strings && + btf_dump_string_data(d, t, id, data) == 0) { + return 0; + } d->typed_dump->is_array_char = true; + } } /* note that we increment depth before calling btf_dump_print() below; @@ -2544,6 +2596,7 @@ int btf_dump__dump_type_data(struct btf_dump *d, __u32 id, d->typed_dump->compact = OPTS_GET(opts, compact, false); d->typed_dump->skip_names = OPTS_GET(opts, skip_names, false); d->typed_dump->emit_zeroes = OPTS_GET(opts, emit_zeroes, false); + d->typed_dump->emit_strings = OPTS_GET(opts, emit_strings, false); ret = btf_dump_dump_type_data(d, NULL, t, id, data, 0, 0); -- 2.49.0.1204.g71687c7c1d-goog

22 hours, 29 minutes

5
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[PATCH 00/33] vfio: Introduce selftests for VFIO

by David Matlack

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

1 week, 2 days

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[PATCH v12] exec: Fix dead-lock in de_thread with ptrace_attach

by Bernd Edlinger

This introduces signal->exec_bprm, which is used to fix the case when at least one of the sibling threads is traced, and therefore the trace process may dead-lock in ptrace_attach, but de_thread will need to wait for the tracer to continue execution. The solution is to detect this situation and allow ptrace_attach to continue by temporarily releasing the cred_guard_mutex, while de_thread() is still waiting for traced zombies to be eventually released by the tracer. In the case of the thread group leader we only have to wait for the thread to become a zombie, which may also need co-operation from the tracer due to PTRACE_O_TRACEEXIT. When a tracer wants to ptrace_attach a task that already is in execve, we simply retry the ptrace_may_access check while temporarily installing the new credentials and dumpability which are about to be used after execve completes. If the ptrace_attach happens on a thread that is a sibling-thread of the thread doing execve, it is sufficient to check against the old credentials, as this thread will be waited for, before the new credentials are installed. Other threads die quickly since the cred_guard_mutex is released, but a deadly signal is already pending. In case the mutex_lock_killable misses the signal, the non-zero current->signal->exec_bprm makes sure they release the mutex immediately and return with -ERESTARTNOINTR. This means there is no API change, unlike the previous version of this patch which was discussed here: https://lore.kernel.org/lkml/b6537ae6-31b1-5c50-f32b-8b8332ace882@hotmail.d… See tools/testing/selftests/ptrace/vmaccess.c for a test case that gets fixed by this change. Note that since the test case was originally designed to test the ptrace_attach returning an error in this situation, the test expectation needed to be adjusted, to allow the API to succeed at the first attempt. Signed-off-by: Bernd Edlinger <bernd.edlinger(a)hotmail.de> --- fs/exec.c | 69 ++++++++++++++++------- fs/proc/base.c | 6 ++ include/linux/cred.h | 1 + include/linux/sched/signal.h | 18 ++++++ kernel/cred.c | 28 +++++++-- kernel/ptrace.c | 32 +++++++++++ kernel/seccomp.c | 12 +++- tools/testing/selftests/ptrace/vmaccess.c | 23 +++++--- 8 files changed, 155 insertions(+), 34 deletions(-) v10: Changes to previous version, make the PTRACE_ATTACH retun -EAGAIN, instead of execve return -ERESTARTSYS. Added some lessions learned to the description. v11: Check old and new credentials in PTRACE_ATTACH again without changing the API. Note: I got actually one response from an automatic checker to the v11 patch, https://lore.kernel.org/lkml/202107121344.wu68hEPF-lkp@intel.com/ which is complaining about: >> kernel/ptrace.c:425:26: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct cred const *old_cred @@ got struct cred const [noderef] __rcu *real_cred @@ 417 struct linux_binprm *bprm = task->signal->exec_bprm; 418 const struct cred *old_cred; 419 struct mm_struct *old_mm; 420 421 retval = down_write_killable(&task->signal->exec_update_lock); 422 if (retval) 423 goto unlock_creds; 424 task_lock(task); > 425 old_cred = task->real_cred; v12: Essentially identical to v11. - Fixed a minor merge conflict in linux v5.17, and fixed the above mentioned nit by adding __rcu to the declaration. - re-tested the patch with all linux versions from v5.11 to v6.6 v10 was an alternative approach which did imply an API change. But I would prefer to avoid such an API change. The difficult part is getting the right dumpability flags assigned before de_thread starts, hope you like this version. If not, the v10 is of course also acceptable. Thanks Bernd. diff --git a/fs/exec.c b/fs/exec.c index 2f2b0acec4f0..902d3b230485 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1041,11 +1041,13 @@ static int exec_mmap(struct mm_struct *mm) return 0; } -static int de_thread(struct task_struct *tsk) +static int de_thread(struct task_struct *tsk, struct linux_binprm *bprm) { struct signal_struct *sig = tsk->signal; struct sighand_struct *oldsighand = tsk->sighand; spinlock_t *lock = &oldsighand->siglock; + struct task_struct *t = tsk; + bool unsafe_execve_in_progress = false; if (thread_group_empty(tsk)) goto no_thread_group; @@ -1068,6 +1070,19 @@ static int de_thread(struct task_struct *tsk) if (!thread_group_leader(tsk)) sig->notify_count--; + while_each_thread(tsk, t) { + if (unlikely(t->ptrace) + && (t != tsk->group_leader || !t->exit_state)) + unsafe_execve_in_progress = true; + } + + if (unlikely(unsafe_execve_in_progress)) { + spin_unlock_irq(lock); + sig->exec_bprm = bprm; + mutex_unlock(&sig->cred_guard_mutex); + spin_lock_irq(lock); + } + while (sig->notify_count) { __set_current_state(TASK_KILLABLE); spin_unlock_irq(lock); @@ -1158,6 +1173,11 @@ static int de_thread(struct task_struct *tsk) release_task(leader); } + if (unlikely(unsafe_execve_in_progress)) { + mutex_lock(&sig->cred_guard_mutex); + sig->exec_bprm = NULL; + } + sig->group_exec_task = NULL; sig->notify_count = 0; @@ -1169,6 +1189,11 @@ static int de_thread(struct task_struct *tsk) return 0; killed: + if (unlikely(unsafe_execve_in_progress)) { + mutex_lock(&sig->cred_guard_mutex); + sig->exec_bprm = NULL; + } + /* protects against exit_notify() and __exit_signal() */ read_lock(&tasklist_lock); sig->group_exec_task = NULL; @@ -1253,6 +1278,24 @@ int begin_new_exec(struct linux_binprm * bprm) if (retval) return retval; + /* If the binary is not readable then enforce mm->dumpable=0 */ + would_dump(bprm, bprm->file); + if (bprm->have_execfd) + would_dump(bprm, bprm->executable); + + /* + * Figure out dumpability. Note that this checking only of current + * is wrong, but userspace depends on it. This should be testing + * bprm->secureexec instead. + */ + if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP || + is_dumpability_changed(current_cred(), bprm->cred) || + !(uid_eq(current_euid(), current_uid()) && + gid_eq(current_egid(), current_gid()))) + set_dumpable(bprm->mm, suid_dumpable); + else + set_dumpable(bprm->mm, SUID_DUMP_USER); + /* * Ensure all future errors are fatal. */ @@ -1261,7 +1304,7 @@ int begin_new_exec(struct linux_binprm * bprm) /* * Make this the only thread in the thread group. */ - retval = de_thread(me); + retval = de_thread(me, bprm); if (retval) goto out; @@ -1284,11 +1327,6 @@ int begin_new_exec(struct linux_binprm * bprm) if (retval) goto out; - /* If the binary is not readable then enforce mm->dumpable=0 */ - would_dump(bprm, bprm->file); - if (bprm->have_execfd) - would_dump(bprm, bprm->executable); - /* * Release all of the old mmap stuff */ @@ -1350,18 +1388,6 @@ int begin_new_exec(struct linux_binprm * bprm) me->sas_ss_sp = me->sas_ss_size = 0; - /* - * Figure out dumpability. Note that this checking only of current - * is wrong, but userspace depends on it. This should be testing - * bprm->secureexec instead. - */ - if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP || - !(uid_eq(current_euid(), current_uid()) && - gid_eq(current_egid(), current_gid()))) - set_dumpable(current->mm, suid_dumpable); - else - set_dumpable(current->mm, SUID_DUMP_USER); - perf_event_exec(); __set_task_comm(me, kbasename(bprm->filename), true); @@ -1480,6 +1506,11 @@ static int prepare_bprm_creds(struct linux_binprm *bprm) if (mutex_lock_interruptible(&current->signal->cred_guard_mutex)) return -ERESTARTNOINTR; + if (unlikely(current->signal->exec_bprm)) { + mutex_unlock(&current->signal->cred_guard_mutex); + return -ERESTARTNOINTR; + } + bprm->cred = prepare_exec_creds(); if (likely(bprm->cred)) return 0; diff --git a/fs/proc/base.c b/fs/proc/base.c index ffd54617c354..0da9adfadb48 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2788,6 +2788,12 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, if (rv < 0) goto out_free; + if (unlikely(current->signal->exec_bprm)) { + mutex_unlock(&current->signal->cred_guard_mutex); + rv = -ERESTARTNOINTR; + goto out_free; + } + rv = security_setprocattr(PROC_I(inode)->op.lsm, file->f_path.dentry->d_name.name, page, count); diff --git a/include/linux/cred.h b/include/linux/cred.h index f923528d5cc4..b01e309f5686 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -159,6 +159,7 @@ extern const struct cred *get_task_cred(struct task_struct *); extern struct cred *cred_alloc_blank(void); extern struct cred *prepare_creds(void); extern struct cred *prepare_exec_creds(void); +extern bool is_dumpability_changed(const struct cred *, const struct cred *); extern int commit_creds(struct cred *); extern void abort_creds(struct cred *); extern const struct cred *override_creds(const struct cred *); diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h index 0014d3adaf84..14df7073a0a8 100644 --- a/include/linux/sched/signal.h +++ b/include/linux/sched/signal.h @@ -234,9 +234,27 @@ struct signal_struct { struct mm_struct *oom_mm; /* recorded mm when the thread group got * killed by the oom killer */ + struct linux_binprm *exec_bprm; /* Used to check ptrace_may_access + * against new credentials while + * de_thread is waiting for other + * traced threads to terminate. + * Set while de_thread is executing. + * The cred_guard_mutex is released + * after de_thread() has called + * zap_other_threads(), therefore + * a fatal signal is guaranteed to be + * already pending in the unlikely + * event, that + * current->signal->exec_bprm happens + * to be non-zero after the + * cred_guard_mutex was acquired. + */ + struct mutex cred_guard_mutex; /* guard against foreign influences on * credential calculations * (notably. ptrace) + * Held while execve runs, except when + * a sibling thread is being traced. * Deprecated do not use in new code. * Use exec_update_lock instead. */ diff --git a/kernel/cred.c b/kernel/cred.c index 98cb4eca23fb..586cb6c7cf6b 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -433,6 +433,28 @@ static bool cred_cap_issubset(const struct cred *set, const struct cred *subset) return false; } +/** + * is_dumpability_changed - Will changing creds from old to new + * affect the dumpability in commit_creds? + * + * Return: false - dumpability will not be changed in commit_creds. + * Return: true - dumpability will be changed to non-dumpable. + * + * @old: The old credentials + * @new: The new credentials + */ +bool is_dumpability_changed(const struct cred *old, const struct cred *new) +{ + if (!uid_eq(old->euid, new->euid) || + !gid_eq(old->egid, new->egid) || + !uid_eq(old->fsuid, new->fsuid) || + !gid_eq(old->fsgid, new->fsgid) || + !cred_cap_issubset(old, new)) + return true; + + return false; +} + /** * commit_creds - Install new credentials upon the current task * @new: The credentials to be assigned @@ -467,11 +489,7 @@ int commit_creds(struct cred *new) get_cred(new); /* we will require a ref for the subj creds too */ /* dumpability changes */ - if (!uid_eq(old->euid, new->euid) || - !gid_eq(old->egid, new->egid) || - !uid_eq(old->fsuid, new->fsuid) || - !gid_eq(old->fsgid, new->fsgid) || - !cred_cap_issubset(old, new)) { + if (is_dumpability_changed(old, new)) { if (task->mm) set_dumpable(task->mm, suid_dumpable); task->pdeath_signal = 0; diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 443057bee87c..eb1c450bb7d7 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -20,6 +20,7 @@ #include <linux/pagemap.h> #include <linux/ptrace.h> #include <linux/security.h> +#include <linux/binfmts.h> #include <linux/signal.h> #include <linux/uio.h> #include <linux/audit.h> @@ -435,6 +436,28 @@ static int ptrace_attach(struct task_struct *task, long request, if (retval) goto unlock_creds; + if (unlikely(task->in_execve)) { + struct linux_binprm *bprm = task->signal->exec_bprm; + const struct cred __rcu *old_cred; + struct mm_struct *old_mm; + + retval = down_write_killable(&task->signal->exec_update_lock); + if (retval) + goto unlock_creds; + task_lock(task); + old_cred = task->real_cred; + old_mm = task->mm; + rcu_assign_pointer(task->real_cred, bprm->cred); + task->mm = bprm->mm; + retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS); + rcu_assign_pointer(task->real_cred, old_cred); + task->mm = old_mm; + task_unlock(task); + up_write(&task->signal->exec_update_lock); + if (retval) + goto unlock_creds; + } + write_lock_irq(&tasklist_lock); retval = -EPERM; if (unlikely(task->exit_state)) @@ -508,6 +531,14 @@ static int ptrace_traceme(void) { int ret = -EPERM; + if (mutex_lock_interruptible(&current->signal->cred_guard_mutex)) + return -ERESTARTNOINTR; + + if (unlikely(current->signal->exec_bprm)) { + mutex_unlock(&current->signal->cred_guard_mutex); + return -ERESTARTNOINTR; + } + write_lock_irq(&tasklist_lock); /* Are we already being traced? */ if (!current->ptrace) { @@ -523,6 +554,7 @@ static int ptrace_traceme(void) } } write_unlock_irq(&tasklist_lock); + mutex_unlock(&current->signal->cred_guard_mutex); return ret; } diff --git a/kernel/seccomp.c b/kernel/seccomp.c index 255999ba9190..b29bbfa0b044 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -1955,9 +1955,15 @@ static long seccomp_set_mode_filter(unsigned int flags, * Make sure we cannot change seccomp or nnp state via TSYNC * while another thread is in the middle of calling exec. */ - if (flags & SECCOMP_FILTER_FLAG_TSYNC && - mutex_lock_killable(&current->signal->cred_guard_mutex)) - goto out_put_fd; + if (flags & SECCOMP_FILTER_FLAG_TSYNC) { + if (mutex_lock_killable(&current->signal->cred_guard_mutex)) + goto out_put_fd; + + if (unlikely(current->signal->exec_bprm)) { + mutex_unlock(&current->signal->cred_guard_mutex); + goto out_put_fd; + } + } spin_lock_irq(&current->sighand->siglock); diff --git a/tools/testing/selftests/ptrace/vmaccess.c b/tools/testing/selftests/ptrace/vmaccess.c index 4db327b44586..3b7d81fb99bb 100644 --- a/tools/testing/selftests/ptrace/vmaccess.c +++ b/tools/testing/selftests/ptrace/vmaccess.c @@ -39,8 +39,15 @@ TEST(vmaccess) f = open(mm, O_RDONLY); ASSERT_GE(f, 0); close(f); - f = kill(pid, SIGCONT); - ASSERT_EQ(f, 0); + f = waitpid(-1, NULL, 0); + ASSERT_NE(f, -1); + ASSERT_NE(f, 0); + ASSERT_NE(f, pid); + f = waitpid(-1, NULL, 0); + ASSERT_EQ(f, pid); + f = waitpid(-1, NULL, 0); + ASSERT_EQ(f, -1); + ASSERT_EQ(errno, ECHILD); } TEST(attach) @@ -57,22 +64,24 @@ TEST(attach) sleep(1); k = ptrace(PTRACE_ATTACH, pid, 0L, 0L); - ASSERT_EQ(errno, EAGAIN); - ASSERT_EQ(k, -1); + ASSERT_EQ(k, 0); k = waitpid(-1, &s, WNOHANG); ASSERT_NE(k, -1); ASSERT_NE(k, 0); ASSERT_NE(k, pid); ASSERT_EQ(WIFEXITED(s), 1); ASSERT_EQ(WEXITSTATUS(s), 0); - sleep(1); - k = ptrace(PTRACE_ATTACH, pid, 0L, 0L); + k = waitpid(-1, &s, 0); + ASSERT_EQ(k, pid); + ASSERT_EQ(WIFSTOPPED(s), 1); + ASSERT_EQ(WSTOPSIG(s), SIGTRAP); + k = ptrace(PTRACE_CONT, pid, 0L, 0L); ASSERT_EQ(k, 0); k = waitpid(-1, &s, 0); ASSERT_EQ(k, pid); ASSERT_EQ(WIFSTOPPED(s), 1); ASSERT_EQ(WSTOPSIG(s), SIGSTOP); - k = ptrace(PTRACE_DETACH, pid, 0L, 0L); + k = ptrace(PTRACE_CONT, pid, 0L, 0L); ASSERT_EQ(k, 0); k = waitpid(-1, &s, 0); ASSERT_EQ(k, pid); -- 2.39.2

1 week, 2 days

7
19
0 0

[PATCH] selftests: harness: Rework is_signed_type() to avoid collision with overflow.h

by Sean Christopherson

Rename is_signed_type() to is_signed_var() to avoid colliding with a macro of the same name defined by linux/overflow.h. Note, overflow.h's version takes a type as the input, whereas the harness's version takes a variable! This fixes warnings (and presumably potential test failures) in tests that utilize the selftests harness and happen to (indirectly) include overflow.h. In file included from tools/include/linux/bits.h:34, from tools/include/linux/bitops.h:14, from tools/include/linux/hashtable.h:13, from include/kvm_util.h:11, from x86/userspace_msr_exit_test.c:11: tools/include/linux/overflow.h:31:9: error: "is_signed_type" redefined [-Werror] 31 | #define is_signed_type(type) (((type)(-1)) < (type)1) | ^~~~~~~~~~~~~~ In file included from include/kvm_test_harness.h:11, from x86/userspace_msr_exit_test.c:9: ../kselftest_harness.h:754:9: note: this is the location of the previous definition 754 | #define is_signed_type(var) (!!(((__typeof__(var))(-1)) < (__typeof__(var))1)) | ^~~~~~~~~~~~~~ Opportunistically use is_signed_type() to implement is_signed_var() so that the relationship and differences are obvious. Fixes: fc92099902fb ("tools headers: Synchronize linux/bits.h with the kernel sources") Cc: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr> Cc: Arnaldo Carvalho de Melo <acme(a)redhat.com> Signed-off-by: Sean Christopherson <seanjc(a)google.com> --- This is probably compile-tested only, I don't think any of the KVM selftests utilize the harness's EXPECT macros. tools/testing/selftests/kselftest_harness.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h index 2925e47db995..f3e7a46345db 100644 --- a/tools/testing/selftests/kselftest_harness.h +++ b/tools/testing/selftests/kselftest_harness.h @@ -56,6 +56,7 @@ #include <asm/types.h> #include <ctype.h> #include <errno.h> +#include <linux/overflow.h> #include <linux/unistd.h> #include <poll.h> #include <stdbool.h> @@ -751,7 +752,7 @@ for (; _metadata->trigger; _metadata->trigger = \ __bail(_assert, _metadata)) -#define is_signed_type(var) (!!(((__typeof__(var))(-1)) < (__typeof__(var))1)) +#define is_signed_var(var) is_signed_type(__typeof__(var)) #define __EXPECT(_expected, _expected_str, _seen, _seen_str, _t, _assert) do { \ /* Avoid multiple evaluation of the cases */ \ @@ -759,7 +760,7 @@ __typeof__(_seen) __seen = (_seen); \ if (!(__exp _t __seen)) { \ /* Report with actual signedness to avoid weird output. */ \ - switch (is_signed_type(__exp) * 2 + is_signed_type(__seen)) { \ + switch (is_signed_var(__exp) * 2 + is_signed_var(__seen)) { \ case 0: { \ uintmax_t __exp_print = (uintmax_t)__exp; \ uintmax_t __seen_print = (uintmax_t)__seen; \ base-commit: 78f4e737a53e1163ded2687a922fce138aee73f5 -- 2.50.0.714.g196bf9f422-goog

1 week, 3 days

4
7
0 0

[Patch v2 0/2] Add kselftest harness selftest with variant

by Wei Yang

We already have a selftest for harness, while there is not usage of FIXTURE_VARIANT. Patch 2 add FIXTURE_VARIANT usage in the selftest. Patch 1 is a typo fix. v2: * drop patch 2 in v1 * adjust patch 2 based on Thomas comment Wei Yang (2): selftests: harness: correct typo of __constructor_order_forward in comment selftests: harness: Add kselftest harness selftest with variant tools/testing/selftests/kselftest_harness.h | 2 +- .../kselftest_harness/harness-selftest.c | 30 +++++++++++++++++++ .../harness-selftest.expected | 20 ++++++++++--- 3 files changed, 47 insertions(+), 5 deletions(-) -- 2.34.1

1 week, 5 days

3
7
0 0

[PATCH 0/4] selftests/mm/uffd: refactor global variables

by Ujwal Kundur

This patchset refactors non-composite global variables into a common struct that can be initialized and passed around per-test instead of relying on the presence of global variables. This allows: - Better encapsulation - Debugging becomes easier -- local variable state can be viewed per stack frame, and we can more easily reason about the variable mutations Patch 1 needs to be applied first and can be followed by any of the other patches. I've ensured that the tests are passing locally (or atleast have the same output as the code on master). Ujwal Kundur (4): selftests/mm/uffd: Refactor non-composite global vars into struct selftests/mm/uffd: Swap global vars with global test options selftests/mm/uffd: Swap global variables with global test opts selftests/mm/uffd: Swap global variables with global test opts tools/testing/selftests/mm/uffd-common.c | 269 +++++----- tools/testing/selftests/mm/uffd-common.h | 78 +-- tools/testing/selftests/mm/uffd-stress.c | 226 ++++---- tools/testing/selftests/mm/uffd-unit-tests.c | 523 ++++++++++--------- tools/testing/selftests/mm/uffd-wp-mremap.c | 23 +- 5 files changed, 591 insertions(+), 528 deletions(-) -- 2.20.1

2 weeks

4
38
0 0

[PATCH v8 00/14] riscv: add SBI FWFT misaligned exception delegation support

by Clément Léger

The SBI Firmware Feature extension allows the S-mode to request some specific features (either hardware or software) to be enabled. This series uses this extension to request misaligned access exception delegation to S-mode in order to let the kernel handle it. It also adds support for the KVM FWFT SBI extension based on the misaligned access handling infrastructure. FWFT SBI extension is part of the SBI V3.0 specifications [1]. It can be tested using the qemu provided at [2] which contains the series from [3]. Upstream kvm-unit-tests can be used inside kvm to tests the correct delegation of misaligned exceptions. Upstream OpenSBI can be used. Note: Since SBI V3.0 is not yet ratified, FWFT extension API is split between interface only and implementation, allowing to pick only the interface which do not have hard dependencies on SBI. The tests can be run using the kselftest from series [4]. $ qemu-system-riscv64 \ -cpu rv64,trap-misaligned-access=true,v=true \ -M virt \ -m 1024M \ -bios fw_dynamic.bin \ -kernel Image ... # ./misaligned TAP version 13 1..23 # Starting 23 tests from 1 test cases. # RUN global.gp_load_lh ... # OK global.gp_load_lh ok 1 global.gp_load_lh # RUN global.gp_load_lhu ... # OK global.gp_load_lhu ok 2 global.gp_load_lhu # RUN global.gp_load_lw ... # OK global.gp_load_lw ok 3 global.gp_load_lw # RUN global.gp_load_lwu ... # OK global.gp_load_lwu ok 4 global.gp_load_lwu # RUN global.gp_load_ld ... # OK global.gp_load_ld ok 5 global.gp_load_ld # RUN global.gp_load_c_lw ... # OK global.gp_load_c_lw ok 6 global.gp_load_c_lw # RUN global.gp_load_c_ld ... # OK global.gp_load_c_ld ok 7 global.gp_load_c_ld # RUN global.gp_load_c_ldsp ... # OK global.gp_load_c_ldsp ok 8 global.gp_load_c_ldsp # RUN global.gp_load_sh ... # OK global.gp_load_sh ok 9 global.gp_load_sh # RUN global.gp_load_sw ... # OK global.gp_load_sw ok 10 global.gp_load_sw # RUN global.gp_load_sd ... # OK global.gp_load_sd ok 11 global.gp_load_sd # RUN global.gp_load_c_sw ... # OK global.gp_load_c_sw ok 12 global.gp_load_c_sw # RUN global.gp_load_c_sd ... # OK global.gp_load_c_sd ok 13 global.gp_load_c_sd # RUN global.gp_load_c_sdsp ... # OK global.gp_load_c_sdsp ok 14 global.gp_load_c_sdsp # RUN global.fpu_load_flw ... # OK global.fpu_load_flw ok 15 global.fpu_load_flw # RUN global.fpu_load_fld ... # OK global.fpu_load_fld ok 16 global.fpu_load_fld # RUN global.fpu_load_c_fld ... # OK global.fpu_load_c_fld ok 17 global.fpu_load_c_fld # RUN global.fpu_load_c_fldsp ... # OK global.fpu_load_c_fldsp ok 18 global.fpu_load_c_fldsp # RUN global.fpu_store_fsw ... # OK global.fpu_store_fsw ok 19 global.fpu_store_fsw # RUN global.fpu_store_fsd ... # OK global.fpu_store_fsd ok 20 global.fpu_store_fsd # RUN global.fpu_store_c_fsd ... # OK global.fpu_store_c_fsd ok 21 global.fpu_store_c_fsd # RUN global.fpu_store_c_fsdsp ... # OK global.fpu_store_c_fsdsp ok 22 global.fpu_store_c_fsdsp # RUN global.gen_sigbus ... [12797.988647] misaligned[618]: unhandled signal 7 code 0x1 at 0x0000000000014dc0 in misaligned[4dc0,10000+76000] [12797.988990] CPU: 0 UID: 0 PID: 618 Comm: misaligned Not tainted 6.13.0-rc6-00008-g4ec4468967c9-dirty #51 [12797.989169] Hardware name: riscv-virtio,qemu (DT) [12797.989264] epc : 0000000000014dc0 ra : 0000000000014d00 sp : 00007fffe165d100 [12797.989407] gp : 000000000008f6e8 tp : 0000000000095760 t0 : 0000000000000008 [12797.989544] t1 : 00000000000965d8 t2 : 000000000008e830 s0 : 00007fffe165d160 [12797.989692] s1 : 000000000000001a a0 : 0000000000000000 a1 : 0000000000000002 [12797.989831] a2 : 0000000000000000 a3 : 0000000000000000 a4 : ffffffffdeadbeef [12797.989964] a5 : 000000000008ef61 a6 : 626769735f6e0000 a7 : fffffffffffff000 [12797.990094] s2 : 0000000000000001 s3 : 00007fffe165d838 s4 : 00007fffe165d848 [12797.990238] s5 : 000000000000001a s6 : 0000000000010442 s7 : 0000000000010200 [12797.990391] s8 : 000000000000003a s9 : 0000000000094508 s10: 0000000000000000 [12797.990526] s11: 0000555567460668 t3 : 00007fffe165d070 t4 : 00000000000965d0 [12797.990656] t5 : fefefefefefefeff t6 : 0000000000000073 [12797.990756] status: 0000000200004020 badaddr: 000000000008ef61 cause: 0000000000000006 [12797.990911] Code: 8793 8791 3423 fcf4 3783 fc84 c737 dead 0713 eef7 (c398) 0001 # OK global.gen_sigbus ok 23 global.gen_sigbus # PASSED: 23 / 23 tests passed. # Totals: pass:23 fail:0 xfail:0 xpass:0 skip:0 error:0 With kvm-tools: # lkvm run -k sbi.flat -m 128 Info: # lkvm run -k sbi.flat -m 128 -c 1 --name guest-97 Info: Removed ghost socket file "/root/.lkvm//guest-97.sock". ########################################################################## # kvm-unit-tests ########################################################################## ... [test messages elided] PASS: sbi: fwft: FWFT extension probing no error PASS: sbi: fwft: get/set reserved feature 0x6 error == SBI_ERR_DENIED PASS: sbi: fwft: get/set reserved feature 0x3fffffff error == SBI_ERR_DENIED PASS: sbi: fwft: get/set reserved feature 0x80000000 error == SBI_ERR_DENIED PASS: sbi: fwft: get/set reserved feature 0xbfffffff error == SBI_ERR_DENIED PASS: sbi: fwft: misaligned_deleg: Get misaligned deleg feature no error PASS: sbi: fwft: misaligned_deleg: Set misaligned deleg feature invalid value error PASS: sbi: fwft: misaligned_deleg: Set misaligned deleg feature invalid value error PASS: sbi: fwft: misaligned_deleg: Set misaligned deleg feature value no error PASS: sbi: fwft: misaligned_deleg: Set misaligned deleg feature value 0 PASS: sbi: fwft: misaligned_deleg: Set misaligned deleg feature value no error PASS: sbi: fwft: misaligned_deleg: Set misaligned deleg feature value 1 PASS: sbi: fwft: misaligned_deleg: Verify misaligned load exception trap in supervisor SUMMARY: 50 tests, 2 unexpected failures, 12 skipped This series is available at [5]. Link: https://github.com/riscv-non-isa/riscv-sbi-doc/releases/download/vv3.0-rc2/… [1] Link: https://github.com/rivosinc/qemu/tree/dev/cleger/misaligned [2] Link: https://lore.kernel.org/all/20241211211933.198792-3-fkonrad@amd.com/T/ [3] Link: https://lore.kernel.org/linux-riscv/20250414123543.1615478-1-cleger@rivosin… [4] Link: https://github.com/rivosinc/linux/tree/dev/cleger/fwft [5] --- V8: - Move misaligned_access_speed under CONFIG_RISCV_MISALIGNED and add a separate commit for that. V7: - Fix ifdefery build problems - Move sbi_fwft_is_supported with fwft_set_req struct - Added Atish Reviewed-by - Updated KVM vcpu cfg hedeleg value in set_delegation - Changed SBI ETIME error mapping to ETIMEDOUT - Fixed a few typo reported by Alok V6: - Rename FWFT interface to remove "_local" - Fix test for MEDELEG values in KVM FWFT support - Add __init for unaligned_access_init() - Rebased on master V5: - Return ERANGE as mapping for SBI_ERR_BAD_RANGE - Removed unused sbi_fwft_get() - Fix kernel for sbi_fwft_local_set_cpumask() - Fix indentation for sbi_fwft_local_set() - Remove spurious space in kvm_sbi_fwft_ops. - Rebased on origin/master - Remove fixes commits and sent them as a separate series [4] V4: - Check SBI version 3.0 instead of 2.0 for FWFT presence - Use long for kvm_sbi_fwft operation return value - Init KVM sbi extension even if default_disabled - Remove revert_on_fail parameter for sbi_fwft_feature_set(). - Fix comments for sbi_fwft_set/get() - Only handle local features (there are no globals yet in the spec) - Add new SBI errors to sbi_err_map_linux_errno() V3: - Added comment about kvm sbi fwft supported/set/get callback requirements - Move struct kvm_sbi_fwft_feature in kvm_sbi_fwft.c - Add a FWFT interface V2: - Added Kselftest for misaligned testing - Added get_user() usage instead of __get_user() - Reenable interrupt when possible in misaligned access handling - Document that riscv supports unaligned-traps - Fix KVM extension state when an init function is present - Rework SBI misaligned accesses trap delegation code - Added support for CPU hotplugging - Added KVM SBI reset callback - Added reset for KVM SBI FWFT lock - Return SBI_ERR_DENIED_LOCKED when LOCK flag is set Clément Léger (14): riscv: sbi: add Firmware Feature (FWFT) SBI extensions definitions riscv: sbi: remove useless parenthesis riscv: sbi: add new SBI error mappings riscv: sbi: add FWFT extension interface riscv: sbi: add SBI FWFT extension calls riscv: misaligned: request misaligned exception from SBI riscv: misaligned: use on_each_cpu() for scalar misaligned access probing riscv: misaligned: declare misaligned_access_speed under CONFIG_RISCV_MISALIGNED riscv: misaligned: move emulated access uniformity check in a function riscv: misaligned: add a function to check misalign trap delegability RISC-V: KVM: add SBI extension init()/deinit() functions RISC-V: KVM: add SBI extension reset callback RISC-V: KVM: add support for FWFT SBI extension RISC-V: KVM: add support for SBI_FWFT_MISALIGNED_DELEG arch/riscv/include/asm/cpufeature.h | 14 +- arch/riscv/include/asm/kvm_host.h | 5 +- arch/riscv/include/asm/kvm_vcpu_sbi.h | 12 + arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h | 29 +++ arch/riscv/include/asm/sbi.h | 60 +++++ arch/riscv/include/uapi/asm/kvm.h | 1 + arch/riscv/kernel/sbi.c | 81 ++++++- arch/riscv/kernel/traps_misaligned.c | 112 ++++++++- arch/riscv/kernel/unaligned_access_speed.c | 8 +- arch/riscv/kvm/Makefile | 1 + arch/riscv/kvm/vcpu.c | 4 +- arch/riscv/kvm/vcpu_sbi.c | 54 +++++ arch/riscv/kvm/vcpu_sbi_fwft.c | 257 +++++++++++++++++++++ arch/riscv/kvm/vcpu_sbi_sta.c | 3 +- 14 files changed, 620 insertions(+), 21 deletions(-) create mode 100644 arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h create mode 100644 arch/riscv/kvm/vcpu_sbi_fwft.c -- 2.49.0

2 weeks, 6 days

9
38
0 0

[PATCH v7 00/30] TDX KVM selftests

by Sagi Shahar

This is v7 of the TDX selftests now that the base TDX patches have been accepted. This series is based on v6.16-rc1 No major changes from v6 asside from rebasing. Thanks, Changes from v6: - Rebased on top of v6.16-rc1 Ackerley Tng (12): KVM: selftests: Add function to allow one-to-one GVA to GPA mappings KVM: selftests: Expose function that sets up sregs based on VM's mode KVM: selftests: Store initial stack address in struct kvm_vcpu KVM: selftests: Add vCPU descriptor table initialization utility KVM: selftests: TDX: Use KVM_TDX_CAPABILITIES to validate TDs' attribute configuration KVM: selftests: TDX: Update load_td_memory_region() for VM memory backed by guest memfd KVM: selftests: Add functions to allow mapping as shared KVM: selftests: KVM: selftests: Expose new vm_vaddr_alloc_private() KVM: selftests: TDX: Add support for TDG.MEM.PAGE.ACCEPT KVM: selftests: TDX: Add support for TDG.VP.VEINFO.GET KVM: selftests: TDX: Add TDX UPM selftest KVM: selftests: TDX: Add TDX UPM selftests for implicit conversion Erdem Aktas (3): KVM: selftests: Add helper functions to create TDX VMs KVM: selftests: TDX: Add TDX lifecycle test KVM: selftests: TDX: Add TDX HLT exit test Isaku Yamahata (1): KVM: selftests: Update kvm_init_vm_address_properties() for TDX Roger Wang (1): KVM: selftests: TDX: Add TDG.VP.INFO test Ryan Afranji (2): KVM: selftests: TDX: Verify the behavior when host consumes a TD private memory KVM: selftests: TDX: Add shared memory test Sagi Shahar (10): KVM: selftests: TDX: Add report_fatal_error test KVM: selftests: TDX: Adding test case for TDX port IO KVM: selftests: TDX: Add basic TDX CPUID test KVM: selftests: TDX: Add basic TDG.VP.VMCALL<GetTdVmCallInfo> test KVM: selftests: TDX: Add TDX IO writes test KVM: selftests: TDX: Add TDX IO reads test KVM: selftests: TDX: Add TDX MSR read/write tests KVM: selftests: TDX: Add TDX MMIO reads test KVM: selftests: TDX: Add TDX MMIO writes test KVM: selftests: TDX: Add TDX CPUID TDVMCALL test Yan Zhao (1): KVM: selftests: TDX: Test LOG_DIRTY_PAGES flag to a non-GUEST_MEMFD memslot tools/testing/selftests/kvm/Makefile.kvm | 8 + .../testing/selftests/kvm/include/kvm_util.h | 36 + .../selftests/kvm/include/x86/kvm_util_arch.h | 1 + .../selftests/kvm/include/x86/processor.h | 2 + .../selftests/kvm/include/x86/tdx/td_boot.h | 83 ++ .../kvm/include/x86/tdx/td_boot_asm.h | 16 + .../selftests/kvm/include/x86/tdx/tdcall.h | 54 + .../selftests/kvm/include/x86/tdx/tdx.h | 67 + .../selftests/kvm/include/x86/tdx/tdx_util.h | 23 + .../selftests/kvm/include/x86/tdx/test_util.h | 133 ++ tools/testing/selftests/kvm/lib/kvm_util.c | 74 +- .../testing/selftests/kvm/lib/x86/processor.c | 97 +- .../selftests/kvm/lib/x86/tdx/td_boot.S | 100 ++ .../selftests/kvm/lib/x86/tdx/tdcall.S | 163 +++ tools/testing/selftests/kvm/lib/x86/tdx/tdx.c | 243 ++++ .../selftests/kvm/lib/x86/tdx/tdx_util.c | 643 +++++++++ .../selftests/kvm/lib/x86/tdx/test_util.c | 187 +++ .../selftests/kvm/x86/tdx_shared_mem_test.c | 129 ++ .../testing/selftests/kvm/x86/tdx_upm_test.c | 461 ++++++ tools/testing/selftests/kvm/x86/tdx_vm_test.c | 1254 +++++++++++++++++ 20 files changed, 3734 insertions(+), 40 deletions(-) create mode 100644 tools/testing/selftests/kvm/include/x86/tdx/td_boot.h create mode 100644 tools/testing/selftests/kvm/include/x86/tdx/td_boot_asm.h create mode 100644 tools/testing/selftests/kvm/include/x86/tdx/tdcall.h create mode 100644 tools/testing/selftests/kvm/include/x86/tdx/tdx.h create mode 100644 tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h create mode 100644 tools/testing/selftests/kvm/include/x86/tdx/test_util.h create mode 100644 tools/testing/selftests/kvm/lib/x86/tdx/td_boot.S create mode 100644 tools/testing/selftests/kvm/lib/x86/tdx/tdcall.S create mode 100644 tools/testing/selftests/kvm/lib/x86/tdx/tdx.c create mode 100644 tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c create mode 100644 tools/testing/selftests/kvm/lib/x86/tdx/test_util.c create mode 100644 tools/testing/selftests/kvm/x86/tdx_shared_mem_test.c create mode 100644 tools/testing/selftests/kvm/x86/tdx_upm_test.c create mode 100644 tools/testing/selftests/kvm/x86/tdx_vm_test.c -- 2.50.0.rc2.692.g299adb8693-goog

3 weeks, 2 days

2
34
0 0

[PATCH v4] selftests: filesystems: Add functional test for the abort file in fusectl

by Chen Linxuan

This patch add a simple functional test for the "abort" file in fusectlfs (/sys/fs/fuse/connections/ID/about). A simple fuse daemon is added for testing. Related discussion can be found in the link below. Link: https://lore.kernel.org/all/CAOQ4uxjKFXOKQxPpxtS6G_nR0tpw95w0GiO68UcWg_OBhm… Signed-off-by: Chen Linxuan <chenlinxuan(a)uniontech.com> Acked-by: Shuah Khan <skhan(a)linuxfoundation.org> Reviewed-by: Amir Goldstein <amir73il(a)gmail.com> Co-developed-by: Miklos Szeredi <miklos(a)szeredi.hu> Reviewed-by: Miklos Szeredi <miklos(a)szeredi.hu> --- Changes in v4: - Apply patch suggested by Miklos Szeredi - Setting up a userns environment for testing - Fix a EBUSY on umount/rmdir - Link to v3: https://lore.kernel.org/all/20250610021007.2800329-2-chenlinxuan@uniontech.… Changes in v3: - Apply changes suggested by Amir Goldstein - Rename the test subdir to filesystems/fuse - Verify errno when connection is aborted - Apply changes suggested by Shuah Khan - Update commit message - Link to v2: https://lore.kernel.org/all/20250517012350.10317-2-chenlinxuan@uniontech.co… Changes in v2: - Apply changes suggested by Amir Goldstein - Check errno - Link to v1: https://lore.kernel.org/all/20250515073449.346774-2-chenlinxuan@uniontech.c… --- MAINTAINERS | 1 + tools/testing/selftests/Makefile | 1 + .../selftests/filesystems/fuse/.gitignore | 3 + .../selftests/filesystems/fuse/Makefile | 21 +++ .../selftests/filesystems/fuse/fuse_mnt.c | 146 ++++++++++++++++++ .../selftests/filesystems/fuse/fusectl_test.c | 140 +++++++++++++++++ 6 files changed, 312 insertions(+) create mode 100644 tools/testing/selftests/filesystems/fuse/.gitignore create mode 100644 tools/testing/selftests/filesystems/fuse/Makefile create mode 100644 tools/testing/selftests/filesystems/fuse/fuse_mnt.c create mode 100644 tools/testing/selftests/filesystems/fuse/fusectl_test.c diff --git a/MAINTAINERS b/MAINTAINERS index a92290fffa163..04d90432c1841 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9901,6 +9901,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git F: Documentation/filesystems/fuse* F: fs/fuse/ F: include/uapi/linux/fuse.h +F: tools/testing/selftests/filesystems/fuse/ FUTEX SUBSYSTEM M: Thomas Gleixner <tglx(a)linutronix.de> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index 339b31e6a6b59..c37a76a8ca214 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -36,6 +36,7 @@ TARGETS += filesystems/fat TARGETS += filesystems/overlayfs TARGETS += filesystems/statmount TARGETS += filesystems/mount-notify +TARGETS += filesystems/fuse TARGETS += firmware TARGETS += fpu TARGETS += ftrace diff --git a/tools/testing/selftests/filesystems/fuse/.gitignore b/tools/testing/selftests/filesystems/fuse/.gitignore new file mode 100644 index 0000000000000..3e72e742d08e8 --- /dev/null +++ b/tools/testing/selftests/filesystems/fuse/.gitignore @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +fuse_mnt +fusectl_test diff --git a/tools/testing/selftests/filesystems/fuse/Makefile b/tools/testing/selftests/filesystems/fuse/Makefile new file mode 100644 index 0000000000000..612aad69a93aa --- /dev/null +++ b/tools/testing/selftests/filesystems/fuse/Makefile @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0-or-later + +CFLAGS += -Wall -O2 -g $(KHDR_INCLUDES) + +TEST_GEN_PROGS := fusectl_test +TEST_GEN_FILES := fuse_mnt + +include ../../lib.mk + +VAR_CFLAGS := $(shell pkg-config fuse --cflags 2>/dev/null) +ifeq ($(VAR_CFLAGS),) +VAR_CFLAGS := -D_FILE_OFFSET_BITS=64 -I/usr/include/fuse +endif + +VAR_LDLIBS := $(shell pkg-config fuse --libs 2>/dev/null) +ifeq ($(VAR_LDLIBS),) +VAR_LDLIBS := -lfuse -pthread +endif + +$(OUTPUT)/fuse_mnt: CFLAGS += $(VAR_CFLAGS) +$(OUTPUT)/fuse_mnt: LDLIBS += $(VAR_LDLIBS) diff --git a/tools/testing/selftests/filesystems/fuse/fuse_mnt.c b/tools/testing/selftests/filesystems/fuse/fuse_mnt.c new file mode 100644 index 0000000000000..d12b17f30fadc --- /dev/null +++ b/tools/testing/selftests/filesystems/fuse/fuse_mnt.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * fusectl test file-system + * Creates a simple FUSE filesystem with a single read-write file (/test) + */ + +#define FUSE_USE_VERSION 26 + +#include <fuse.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <fcntl.h> +#include <stdlib.h> +#include <unistd.h> + +#define MAX(a, b) ((a) > (b) ? (a) : (b)) + +static char *content; +static size_t content_size = 0; +static const char test_path[] = "/test"; + +static int test_getattr(const char *path, struct stat *st) +{ + memset(st, 0, sizeof(*st)); + + if (!strcmp(path, "/")) { + st->st_mode = S_IFDIR | 0755; + st->st_nlink = 2; + return 0; + } + + if (!strcmp(path, test_path)) { + st->st_mode = S_IFREG | 0664; + st->st_nlink = 1; + st->st_size = content_size; + return 0; + } + + return -ENOENT; +} + +static int test_readdir(const char *path, void *buf, fuse_fill_dir_t filler, + off_t offset, struct fuse_file_info *fi) +{ + if (strcmp(path, "/")) + return -ENOENT; + + filler(buf, ".", NULL, 0); + filler(buf, "..", NULL, 0); + filler(buf, test_path + 1, NULL, 0); + + return 0; +} + +static int test_open(const char *path, struct fuse_file_info *fi) +{ + if (strcmp(path, test_path)) + return -ENOENT; + + return 0; +} + +static int test_read(const char *path, char *buf, size_t size, off_t offset, + struct fuse_file_info *fi) +{ + if (strcmp(path, test_path) != 0) + return -ENOENT; + + if (!content || content_size == 0) + return 0; + + if (offset >= content_size) + return 0; + + if (offset + size > content_size) + size = content_size - offset; + + memcpy(buf, content + offset, size); + + return size; +} + +static int test_write(const char *path, const char *buf, size_t size, + off_t offset, struct fuse_file_info *fi) +{ + size_t new_size; + + if (strcmp(path, test_path) != 0) + return -ENOENT; + + if(offset > content_size) + return -EINVAL; + + new_size = MAX(offset + size, content_size); + + if (new_size > content_size) + content = realloc(content, new_size); + + content_size = new_size; + + if (!content) + return -ENOMEM; + + memcpy(content + offset, buf, size); + + return size; +} + +static int test_truncate(const char *path, off_t size) +{ + if (strcmp(path, test_path) != 0) + return -ENOENT; + + if (size == 0) { + free(content); + content = NULL; + content_size = 0; + return 0; + } + + content = realloc(content, size); + + if (!content) + return -ENOMEM; + + if (size > content_size) + memset(content + content_size, 0, size - content_size); + + content_size = size; + return 0; +} + +static struct fuse_operations memfd_ops = { + .getattr = test_getattr, + .readdir = test_readdir, + .open = test_open, + .read = test_read, + .write = test_write, + .truncate = test_truncate, +}; + +int main(int argc, char *argv[]) +{ + return fuse_main(argc, argv, &memfd_ops, NULL); +} diff --git a/tools/testing/selftests/filesystems/fuse/fusectl_test.c b/tools/testing/selftests/filesystems/fuse/fusectl_test.c new file mode 100644 index 0000000000000..8d124d1cacb26 --- /dev/null +++ b/tools/testing/selftests/filesystems/fuse/fusectl_test.c @@ -0,0 +1,140 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// Copyright (c) 2025 Chen Linxuan <chenlinxuan(a)uniontech.com> + +#define _GNU_SOURCE + +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/mount.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <unistd.h> +#include <dirent.h> +#include <sched.h> +#include <linux/limits.h> + +#include "../../kselftest_harness.h" + +#define FUSECTL_MOUNTPOINT "/sys/fs/fuse/connections" +#define FUSE_MOUNTPOINT "/tmp/fuse_mnt_XXXXXX" +#define FUSE_DEVICE "/dev/fuse" +#define FUSECTL_TEST_VALUE "1" + +static void write_file(struct __test_metadata *const _metadata, + const char *path, const char *val) +{ + int fd = open(path, O_WRONLY); + size_t len = strlen(val); + + ASSERT_GE(fd, 0); + ASSERT_EQ(write(fd, val, len), len); + ASSERT_EQ(close(fd), 0); +} + +FIXTURE(fusectl){ + char fuse_mountpoint[sizeof(FUSE_MOUNTPOINT)]; + int connection; +}; + +FIXTURE_SETUP(fusectl) +{ + const char *fuse_mnt_prog = "./fuse_mnt"; + int status, pid; + struct stat statbuf; + uid_t uid = getuid(); + gid_t gid = getgid(); + char buf[32]; + + /* Setup userns */ + ASSERT_EQ(unshare(CLONE_NEWNS|CLONE_NEWUSER), 0); + sprintf(buf, "0 %d 1", uid); + write_file(_metadata, "/proc/self/uid_map", buf); + write_file(_metadata, "/proc/self/setgroups", "deny"); + sprintf(buf, "0 %d 1", gid); + write_file(_metadata, "/proc/self/gid_map", buf); + ASSERT_EQ(mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL), 0); + + strcpy(self->fuse_mountpoint, FUSE_MOUNTPOINT); + + if (!mkdtemp(self->fuse_mountpoint)) + SKIP(return, + "Failed to create FUSE mountpoint %s", + strerror(errno)); + + if (access(FUSECTL_MOUNTPOINT, F_OK)) + SKIP(return, + "FUSE control filesystem not mounted"); + + pid = fork(); + if (pid < 0) + SKIP(return, + "Failed to fork FUSE daemon process: %s", + strerror(errno)); + + if (pid == 0) { + execlp(fuse_mnt_prog, fuse_mnt_prog, self->fuse_mountpoint, NULL); + exit(errno); + } + + waitpid(pid, &status, 0); + if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { + SKIP(return, + "Failed to start FUSE daemon %s", + strerror(WEXITSTATUS(status))); + } + + if (stat(self->fuse_mountpoint, &statbuf)) + SKIP(return, + "Failed to stat FUSE mountpoint %s", + strerror(errno)); + + self->connection = statbuf.st_dev; +} + +FIXTURE_TEARDOWN(fusectl) +{ + umount2(self->fuse_mountpoint, MNT_DETACH); + rmdir(self->fuse_mountpoint); +} + +TEST_F(fusectl, abort) +{ + char path_buf[PATH_MAX]; + int abort_fd, test_fd, ret; + + sprintf(path_buf, "/sys/fs/fuse/connections/%d/abort", self->connection); + + ASSERT_EQ(0, access(path_buf, F_OK)); + + abort_fd = open(path_buf, O_WRONLY); + ASSERT_GE(abort_fd, 0); + + sprintf(path_buf, "%s/test", self->fuse_mountpoint); + + test_fd = open(path_buf, O_RDWR); + ASSERT_GE(test_fd, 0); + + ret = read(test_fd, path_buf, sizeof(path_buf)); + ASSERT_EQ(ret, 0); + + ret = write(test_fd, "test", sizeof("test")); + ASSERT_EQ(ret, sizeof("test")); + + ret = lseek(test_fd, 0, SEEK_SET); + ASSERT_GE(ret, 0); + + ret = write(abort_fd, FUSECTL_TEST_VALUE, sizeof(FUSECTL_TEST_VALUE)); + ASSERT_GT(ret, 0); + + close(abort_fd); + + ret = read(test_fd, path_buf, sizeof(path_buf)); + ASSERT_EQ(ret, -1); + ASSERT_EQ(errno, ENOTCONN); +} + +TEST_HARNESS_MAIN -- 2.43.0

3 weeks, 4 days

5
5
0 0

[PATCH v4 00/38] Mediated vPMU 4.0 for x86

by Mingwei Zhang

With joint effort from the upstream KVM community, we come up with the 4th version of mediated vPMU for x86. We have made the following changes on top of the previous RFC v3. v3 -> v4 - Rebase whole patchset on 6.14-rc3 base. - Address Peter's comments on Perf part. - Address Sean's comments on KVM part. * Change key word "passthrough" to "mediated" in all patches * Change static enabling to user space dynamic enabling via KVM_CAP_PMU_CAPABILITY. * Only support GLOBAL_CTRL save/restore with VMCS exec_ctrl, drop the MSR save/retore list support for GLOBAL_CTRL, thus the support of mediated vPMU is constrained to SapphireRapids and later CPUs on Intel side. * Merge some small changes into a single patch. - Address Sandipan's comment on invalid pmu pointer. - Add back "eventsel_hw" and "fixed_ctr_ctrl_hw" to avoid to directly manipulate pmc->eventsel and pmu->fixed_ctr_ctrl. Testing (Intel side): - Perf-based legacy vPMU (force emulation on/off) * Kselftests pmu_counters_test, pmu_event_filter_test and vmx_pmu_caps_test pass. * KUT PMU tests pmu, pmu_lbr, pmu_pebs pass. * Basic perf counting/sampling tests in 3 scenarios, guest-only, host-only and host-guest coexistence all pass. - Mediated vPMU (force emulation on/off) * Kselftests pmu_counters_test, pmu_event_filter_test and vmx_pmu_caps_test pass. * KUT PMU tests pmu, pmu_lbr, pmu_pebs pass. * Basic perf counting/sampling tests in 3 scenarios, guest-only, host-only and host-guest coexistence all pass. - Failures. All above tests passed on Intel Granite Rapids as well except a failure on KUT/pmu_pebs. * GP counter 0 (0xfffffffffffe): PEBS record (written seq 0) is verified (including size, counters and cfg). * The pebs_data_cfg (0xb500000000) doesn't match with the effective MSR_PEBS_DATA_CFG (0x0). * This failure has nothing to do with this mediated vPMU patch set. The failure is caused by Granite Rapids supported timed PEBS which needs extra support on Qemu and KUT/pmu_pebs. These extra support would be sent in separate patches later. Testing (AMD side): - Kselftests pmu_counters_test, pmu_event_filter_test and vmx_pmu_caps_test all pass - legacy guest with KUT/pmu: * qmeu option: -cpu host, -perfctr-core * when set force_emulation_prefix=1, passes * when set force_emulation_prefix=0, passes - perfmon-v1 guest with KUT/pmu: * qmeu option: -cpu host, -perfmon-v2 * when set force_emulation_prefix=1, passes * when set force_emulation_prefix=0, passes - perfmon-v2 guest with KUT/pmu: * qmeu option: -cpu host * when set force_emulation_prefix=1, passes * when set force_emulation_prefix=0, passes - perf_fuzzer (perfmon-v2): * fails with soft lockup in guest in current version. * culprit could be between 6.13 ~ 6.14-rc3 within KVM * Series tested on 6.12 and 6.13 without issue. Note: a QEMU series is needed to run mediated vPMU v4: - https://lore.kernel.org/all/20250324123712.34096-1-dapeng1.mi@linux.intel.c… History: - RFC v3: https://lore.kernel.org/all/20240801045907.4010984-1-mizhang@google.com/ - RFC v2: https://lore.kernel.org/all/20240506053020.3911940-1-mizhang@google.com/ - RFC v1: https://lore.kernel.org/all/20240126085444.324918-1-xiong.y.zhang@linux.int… Dapeng Mi (18): KVM: x86/pmu: Introduce enable_mediated_pmu global parameter KVM: x86/pmu: Check PMU cpuid configuration from user space KVM: x86: Rename vmx_vmentry/vmexit_ctrl() helpers KVM: x86/pmu: Add perf_capabilities field in struct kvm_host_values{} KVM: x86/pmu: Move PMU_CAP_{FW_WRITES,LBR_FMT} into msr-index.h header KVM: VMX: Add macros to wrap around {secondary,tertiary}_exec_controls_changebit() KVM: x86/pmu: Check if mediated vPMU can intercept rdpmc KVM: x86/pmu/vmx: Save/load guest IA32_PERF_GLOBAL_CTRL with vm_exit/entry_ctrl KVM: x86/pmu: Optimize intel/amd_pmu_refresh() helpers KVM: x86/pmu: Setup PMU MSRs' interception mode KVM: x86/pmu: Handle PMU MSRs interception and event filtering KVM: x86/pmu: Switch host/guest PMU context at vm-exit/vm-entry KVM: x86/pmu: Handle emulated instruction for mediated vPMU KVM: nVMX: Add macros to simplify nested MSR interception setting KVM: selftests: Add mediated vPMU supported for pmu tests KVM: Selftests: Support mediated vPMU for vmx_pmu_caps_test KVM: Selftests: Fix pmu_counters_test error for mediated vPMU KVM: x86/pmu: Expose enable_mediated_pmu parameter to user space Kan Liang (8): perf: Support get/put mediated PMU interfaces perf: Skip pmu_ctx based on event_type perf: Clean up perf ctx time perf: Add a EVENT_GUEST flag perf: Add generic exclude_guest support perf: Add switch_guest_ctx() interface perf/x86: Support switch_guest_ctx interface perf/x86/intel: Support PERF_PMU_CAP_MEDIATED_VPMU Mingwei Zhang (5): perf/x86: Forbid PMI handler when guest own PMU perf/x86/core: Plumb mediated PMU capability from x86_pmu to x86_pmu_cap KVM: x86/pmu: Exclude PMU MSRs in vmx_get_passthrough_msr_slot() KVM: x86/pmu: introduce eventsel_hw to prepare for pmu event filtering KVM: nVMX: Add nested virtualization support for mediated PMU Sandipan Das (4): perf/x86/core: Do not set bit width for unavailable counters KVM: x86/pmu: Add AMD PMU registers to direct access list KVM: x86/pmu/svm: Set GuestOnly bit and clear HostOnly bit when guest write to event selectors perf/x86/amd: Support PERF_PMU_CAP_MEDIATED_VPMU for AMD host Xiong Zhang (3): x86/irq: Factor out common code for installing kvm irq handler perf: core/x86: Register a new vector for KVM GUEST PMI KVM: x86/pmu: Register KVM_GUEST_PMI_VECTOR handler arch/x86/events/amd/core.c | 2 + arch/x86/events/core.c | 40 +- arch/x86/events/intel/core.c | 5 + arch/x86/include/asm/hardirq.h | 1 + arch/x86/include/asm/idtentry.h | 1 + arch/x86/include/asm/irq.h | 2 +- arch/x86/include/asm/irq_vectors.h | 5 +- arch/x86/include/asm/kvm-x86-pmu-ops.h | 2 + arch/x86/include/asm/kvm_host.h | 10 + arch/x86/include/asm/msr-index.h | 18 +- arch/x86/include/asm/perf_event.h | 1 + arch/x86/include/asm/vmx.h | 1 + arch/x86/kernel/idt.c | 1 + arch/x86/kernel/irq.c | 39 +- arch/x86/kvm/cpuid.c | 15 + arch/x86/kvm/pmu.c | 254 ++++++++- arch/x86/kvm/pmu.h | 45 ++ arch/x86/kvm/svm/pmu.c | 148 ++++- arch/x86/kvm/svm/svm.c | 26 + arch/x86/kvm/svm/svm.h | 2 +- arch/x86/kvm/vmx/capabilities.h | 11 +- arch/x86/kvm/vmx/nested.c | 68 ++- arch/x86/kvm/vmx/pmu_intel.c | 224 ++++++-- arch/x86/kvm/vmx/vmx.c | 89 +-- arch/x86/kvm/vmx/vmx.h | 11 +- arch/x86/kvm/x86.c | 63 ++- arch/x86/kvm/x86.h | 2 + include/linux/perf_event.h | 47 +- kernel/events/core.c | 519 ++++++++++++++---- .../beauty/arch/x86/include/asm/irq_vectors.h | 5 +- .../selftests/kvm/include/kvm_test_harness.h | 13 + .../testing/selftests/kvm/include/kvm_util.h | 3 + .../selftests/kvm/include/x86/processor.h | 8 + tools/testing/selftests/kvm/lib/kvm_util.c | 23 + .../selftests/kvm/x86/pmu_counters_test.c | 24 +- .../selftests/kvm/x86/pmu_event_filter_test.c | 8 +- .../selftests/kvm/x86/vmx_pmu_caps_test.c | 2 +- 37 files changed, 1480 insertions(+), 258 deletions(-) base-commit: 0ad2507d5d93f39619fc42372c347d6006b64319 -- 2.49.0.395.g12beb8f557-goog

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