March 2025 - Linux-kselftest-mirror

[PATCH v7 0/6] mm/memfd: introduce MFD_NOEXEC_SEAL and MFD_EXEC

by jeffxu＠chromium.org

From: Jeff Xu <jeffxu(a)google.com> Since Linux introduced the memfd feature, memfd have always had their execute bit set, and the memfd_create() syscall doesn't allow setting it differently. However, in a secure by default system, such as ChromeOS, (where all executables should come from the rootfs, which is protected by Verified boot), this executable nature of memfd opens a door for NoExec bypass and enables “confused deputy attack”. E.g, in VRP bug [1]: cros_vm process created a memfd to share the content with an external process, however the memfd is overwritten and used for executing arbitrary code and root escalation. [2] lists more VRP in this kind. On the other hand, executable memfd has its legit use, runc uses memfd’s seal and executable feature to copy the contents of the binary then execute them, for such system, we need a solution to differentiate runc's use of executable memfds and an attacker's [3]. To address those above, this set of patches add following: 1> Let memfd_create() set X bit at creation time. 2> Let memfd to be sealed for modifying X bit. 3> A new pid namespace sysctl: vm.memfd_noexec to control the behavior of X bit.For example, if a container has vm.memfd_noexec=2, then memfd_create() without MFD_NOEXEC_SEAL will be rejected. 4> A new security hook in memfd_create(). This make it possible to a new LSM, which rejects or allows executable memfd based on its security policy. Change history: v7: - patch 2/6: remove #ifdef and MAX_PATH (memfd_test.c). - patch 3/6: check capability (CAP_SYS_ADMIN) from userns instead of global ns (pid_sysctl.h). Add a tab (pid_namespace.h). - patch 5/6: remove #ifdef (memfd_test.c) - patch 6/6: remove unneeded security_move_mount(security.c). v6:https://lore.kernel.org/lkml/20221206150233.1963717-1-jeffxu@google.com/ - Address comment and move "#ifdef CONFIG_" from .c file to pid_sysctl.h v5:https://lore.kernel.org/lkml/20221206152358.1966099-1-jeffxu@google.com/ - Pass vm.memfd_noexec from current ns to child ns. - Fix build issue detected by kernel test robot. - Add missing security.c v3:https://lore.kernel.org/lkml/20221202013404.163143-1-jeffxu@google.com/ - Address API design comments in v2. - Let memfd_create() to set X bit at creation time. - A new pid namespace sysctl: vm.memfd_noexec to control behavior of X bit. - A new security hook in memfd_create(). v2:https://lore.kernel.org/lkml/20220805222126.142525-1-jeffxu@google.com/ - address comments in V1. - add sysctl (vm.mfd_noexec) to set the default file permissions of memfd_create to be non-executable. v1:https://lwn.net/Articles/890096/ [1] https://crbug.com/1305411 [2] https://bugs.chromium.org/p/chromium/issues/list?q=type%3Dbug-security%20me… [3] https://lwn.net/Articles/781013/ Daniel Verkamp (2): mm/memfd: add F_SEAL_EXEC selftests/memfd: add tests for F_SEAL_EXEC Jeff Xu (4): mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC mm/memfd: Add write seals when apply SEAL_EXEC to executable memfd selftests/memfd: add tests for MFD_NOEXEC_SEAL MFD_EXEC mm/memfd: security hook for memfd_create include/linux/lsm_hook_defs.h | 1 + include/linux/lsm_hooks.h | 4 + include/linux/pid_namespace.h | 19 ++ include/linux/security.h | 6 + include/uapi/linux/fcntl.h | 1 + include/uapi/linux/memfd.h | 4 + kernel/pid_namespace.c | 5 + kernel/pid_sysctl.h | 59 ++++ mm/memfd.c | 61 +++- mm/shmem.c | 6 + security/security.c | 5 + tools/testing/selftests/memfd/fuse_test.c | 1 + tools/testing/selftests/memfd/memfd_test.c | 341 ++++++++++++++++++++- 13 files changed, 510 insertions(+), 3 deletions(-) create mode 100644 kernel/pid_sysctl.h base-commit: eb7081409f94a9a8608593d0fb63a1aa3d6f95d8 -- 2.39.0.rc1.256.g54fd8350bd-goog

1 week, 2 days

9
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[PATCH v2 00/16] selftests: vDSO: parse_vdso: Make compatible with nolibc

by Thomas Weißschuh

For testing the functionality of the vDSO, it is necessary to build userspace programs for multiple different architectures. It is additional work to acquire matching userspace cross-compilers with full C libraries and then building root images out of those. The kernel tree already contains nolibc, a small, header-only C library. By using it, it is possible to build userspace programs without any additional dependencies. For example the kernel.org crosstools or multi-target clang can be used to build test programs for a multitude of architectures. While nolibc is very limited, it is enough for many selftests. With some minor adjustments it is possible to make parse_vdso.c compatible with nolibc. As an example, vdso_standalone_test_x86 is now built from the same C code as the regular vdso_test_gettimeofday, while still being completely standalone. Also drop the dependency of parse_vdso.c on the elf.h header from libc and only use the one from the kernel's UAPI. While this series is useful on its own now, it will also integrate with the kunit UAPI framework currently under development: https://lore.kernel.org/lkml/20250217-kunit-kselftests-v1-0-42b4524c3b0a@li… Signed-off-by: Thomas Weißschuh <thomas.weissschuh(a)linutronix.de> --- Changes in v2: - Provide a limits.h header in nolibc - Pick up Reviewed-by tags from Kees - Link to v1: https://lore.kernel.org/r/20250203-parse_vdso-nolibc-v1-0-9cb6268d77be@linu… --- Thomas Weißschuh (16): MAINTAINERS: Add vDSO selftests elf, uapi: Add definition for STN_UNDEF elf, uapi: Add definition for DT_GNU_HASH elf, uapi: Add definitions for VER_FLG_BASE and VER_FLG_WEAK elf, uapi: Add type ElfXX_Versym elf, uapi: Add types ElfXX_Verdef and ElfXX_Veraux tools/include: Add uapi/linux/elf.h selftests: Add headers target tools/nolibc: add limits.h shim header selftests: vDSO: vdso_standalone_test_x86: Use vdso_init_form_sysinfo_ehdr selftests: vDSO: parse_vdso: Drop vdso_init_from_auxv() selftests: vDSO: parse_vdso: Use UAPI headers instead of libc headers selftests: vDSO: parse_vdso: Test __SIZEOF_LONG__ instead of ULONG_MAX selftests: vDSO: vdso_test_gettimeofday: Clean up includes selftests: vDSO: vdso_test_gettimeofday: Make compatible with nolibc selftests: vDSO: vdso_standalone_test_x86: Switch to nolibc MAINTAINERS | 1 + include/uapi/linux/elf.h | 38 ++ tools/include/nolibc/Makefile | 1 + tools/include/nolibc/limits.h | 7 + tools/include/uapi/linux/elf.h | 524 +++++++++++++++++++++ tools/testing/selftests/lib.mk | 5 +- tools/testing/selftests/vDSO/Makefile | 11 +- tools/testing/selftests/vDSO/parse_vdso.c | 19 +- tools/testing/selftests/vDSO/parse_vdso.h | 1 - .../selftests/vDSO/vdso_standalone_test_x86.c | 143 +----- .../selftests/vDSO/vdso_test_gettimeofday.c | 4 +- 11 files changed, 590 insertions(+), 164 deletions(-) --- base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b change-id: 20241017-parse_vdso-nolibc-e069baa7ff48 Best regards, -- Thomas Weißschuh <thomas.weissschuh(a)linutronix.de>

1 week, 5 days

7
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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 month, 1 week

7
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[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

1 month, 3 weeks

8
126
0 0

[PATCH/RFC] kunit/rtc: Add real support for very slow tests

by Geert Uytterhoeven

When running rtc_lib_test ("lib_test" before my "[PATCH] rtc: Rename lib_test to rtc_lib_test") on m68k/ARAnyM: KTAP version 1 1..1 KTAP version 1 # Subtest: rtc_lib_test_cases # module: rtc_lib_test 1..2 # rtc_time64_to_tm_test_date_range_1000: Test should be marked slow (runtime: 3.222371420s) ok 1 rtc_time64_to_tm_test_date_range_1000 # rtc_time64_to_tm_test_date_range_160000: try timed out # rtc_time64_to_tm_test_date_range_160000: test case timed out # rtc_time64_to_tm_test_date_range_160000.speed: slow not ok 2 rtc_time64_to_tm_test_date_range_160000 # rtc_lib_test_cases: pass:1 fail:1 skip:0 total:2 # Totals: pass:1 fail:1 skip:0 total:2 not ok 1 rtc_lib_test_cases Commit 02c2d0c2a84172c3 ("kunit: Add speed attribute") added the notion of "very slow" tests, but this is further unused and unhandled. Hence: 1. Introduce KUNIT_CASE_VERY_SLOW(), 2. Increase timeout by ten; ideally this should only be done for very slow tests, but I couldn't find how to access kunit_case.attr.case from kunit_try_catch_run(), 3. Mark rtc_time64_to_tm_test_date_range_1000 slow, 4. Mark rtc_time64_to_tm_test_date_range_160000 very slow. Afterwards: KTAP version 1 1..1 KTAP version 1 # Subtest: rtc_lib_test_cases # module: rtc_lib_test 1..2 # rtc_time64_to_tm_test_date_range_1000.speed: slow ok 1 rtc_time64_to_tm_test_date_range_1000 # rtc_time64_to_tm_test_date_range_160000.speed: very_slow ok 2 rtc_time64_to_tm_test_date_range_160000 # rtc_lib_test_cases: pass:2 fail:0 skip:0 total:2 # Totals: pass:2 fail:0 skip:0 total:2 ok 1 rtc_lib_test_cases Signed-off-by: Geert Uytterhoeven <geert(a)linux-m68k.org> --- drivers/rtc/rtc_lib_test.c | 4 ++-- include/kunit/test.h | 11 +++++++++++ lib/kunit/try-catch.c | 3 ++- 3 files changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/rtc/rtc_lib_test.c b/drivers/rtc/rtc_lib_test.c index c30c759662e39b48..fd3210e39d37dbc6 100644 --- a/drivers/rtc/rtc_lib_test.c +++ b/drivers/rtc/rtc_lib_test.c @@ -85,8 +85,8 @@ static void rtc_time64_to_tm_test_date_range_1000(struct kunit *test) } static struct kunit_case rtc_lib_test_cases[] = { - KUNIT_CASE(rtc_time64_to_tm_test_date_range_1000), - KUNIT_CASE_SLOW(rtc_time64_to_tm_test_date_range_160000), + KUNIT_CASE_SLOW(rtc_time64_to_tm_test_date_range_1000), + KUNIT_CASE_VERY_SLOW(rtc_time64_to_tm_test_date_range_160000), {} }; diff --git a/include/kunit/test.h b/include/kunit/test.h index 9b773406e01f3c43..4e3c1cae5b41466e 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -183,6 +183,17 @@ static inline char *kunit_status_to_ok_not_ok(enum kunit_status status) { .run_case = test_name, .name = #test_name, \ .attr.speed = KUNIT_SPEED_SLOW, .module_name = KBUILD_MODNAME} +/** + * KUNIT_CASE_VERY_SLOW - A helper for creating a &struct kunit_case + * with the very slow attribute + * + * @test_name: a reference to a test case function. + */ + +#define KUNIT_CASE_VERY_SLOW(test_name) \ + { .run_case = test_name, .name = #test_name, \ + .attr.speed = KUNIT_SPEED_VERY_SLOW, .module_name = KBUILD_MODNAME} + /** * KUNIT_CASE_PARAM - A helper for creation a parameterized &struct kunit_case * diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c index 6bbe0025b0790bd2..92099c67bb21d0a4 100644 --- a/lib/kunit/try-catch.c +++ b/lib/kunit/try-catch.c @@ -56,7 +56,8 @@ static unsigned long kunit_test_timeout(void) * If tests timeout due to exceeding sysctl_hung_task_timeout_secs, * the task will be killed and an oops generated. */ - return 300 * msecs_to_jiffies(MSEC_PER_SEC); /* 5 min */ + // FIXME times ten for KUNIT_SPEED_VERY_SLOW? + return 10 * 300 * msecs_to_jiffies(MSEC_PER_SEC); /* 5 min */ } void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context) -- 2.43.0

2 months, 1 week

3
3
0 0

[PATCH v2] selftests/ptrace/get_syscall_info: fix for MIPS n32

by Dmitry V. Levin

MIPS n32 is one of two ILP32 architectures supported by the kernel that have 64-bit syscall arguments (another one is x32). When this test passed 32-bit arguments to syscall(), they were sign-extended in libc, PTRACE_GET_SYSCALL_INFO reported these sign-extended 64-bit values, and the test complained about the mismatch. Fix this by passing arguments of the appropriate type to syscall(), which is "unsigned long long" on MIPS n32, and __kernel_ulong_t on other architectures. As a side effect, this also extends the test on all 64-bit architectures by choosing constants that don't fit into 32-bit integers. Signed-off-by: Dmitry V. Levin <ldv(a)strace.io> --- v2: Fixed MIPS #ifdef. .../selftests/ptrace/get_syscall_info.c | 53 +++++++++++-------- 1 file changed, 32 insertions(+), 21 deletions(-) diff --git a/tools/testing/selftests/ptrace/get_syscall_info.c b/tools/testing/selftests/ptrace/get_syscall_info.c index 5bcd1c7b5be6..2970f72d66d3 100644 --- a/tools/testing/selftests/ptrace/get_syscall_info.c +++ b/tools/testing/selftests/ptrace/get_syscall_info.c @@ -11,8 +11,19 @@ #include <err.h> #include <signal.h> #include <asm/unistd.h> +#include <linux/types.h> #include "linux/ptrace.h" +#if defined(_MIPS_SIM) && _MIPS_SIM == _MIPS_SIM_NABI32 +/* + * MIPS N32 is the only architecture where __kernel_ulong_t + * does not match the bitness of syscall arguments. + */ +typedef unsigned long long kernel_ulong_t; +#else +typedef __kernel_ulong_t kernel_ulong_t; +#endif + static int kill_tracee(pid_t pid) { @@ -42,37 +53,37 @@ sys_ptrace(int request, pid_t pid, unsigned long addr, unsigned long data) TEST(get_syscall_info) { - static const unsigned long args[][7] = { + const kernel_ulong_t args[][7] = { /* a sequence of architecture-agnostic syscalls */ { __NR_chdir, - (unsigned long) "", - 0xbad1fed1, - 0xbad2fed2, - 0xbad3fed3, - 0xbad4fed4, - 0xbad5fed5 + (uintptr_t) "", + (kernel_ulong_t) 0xdad1bef1bad1fed1ULL, + (kernel_ulong_t) 0xdad2bef2bad2fed2ULL, + (kernel_ulong_t) 0xdad3bef3bad3fed3ULL, + (kernel_ulong_t) 0xdad4bef4bad4fed4ULL, + (kernel_ulong_t) 0xdad5bef5bad5fed5ULL }, { __NR_gettid, - 0xcaf0bea0, - 0xcaf1bea1, - 0xcaf2bea2, - 0xcaf3bea3, - 0xcaf4bea4, - 0xcaf5bea5 + (kernel_ulong_t) 0xdad0bef0caf0bea0ULL, + (kernel_ulong_t) 0xdad1bef1caf1bea1ULL, + (kernel_ulong_t) 0xdad2bef2caf2bea2ULL, + (kernel_ulong_t) 0xdad3bef3caf3bea3ULL, + (kernel_ulong_t) 0xdad4bef4caf4bea4ULL, + (kernel_ulong_t) 0xdad5bef5caf5bea5ULL }, { __NR_exit_group, 0, - 0xfac1c0d1, - 0xfac2c0d2, - 0xfac3c0d3, - 0xfac4c0d4, - 0xfac5c0d5 + (kernel_ulong_t) 0xdad1bef1fac1c0d1ULL, + (kernel_ulong_t) 0xdad2bef2fac2c0d2ULL, + (kernel_ulong_t) 0xdad3bef3fac3c0d3ULL, + (kernel_ulong_t) 0xdad4bef4fac4c0d4ULL, + (kernel_ulong_t) 0xdad5bef5fac5c0d5ULL } }; - const unsigned long *exp_args; + const kernel_ulong_t *exp_args; pid_t pid = fork(); @@ -154,7 +165,7 @@ TEST(get_syscall_info) } ASSERT_LT(0, (rc = sys_ptrace(PTRACE_GET_SYSCALL_INFO, pid, size, - (unsigned long) &info))) { + (uintptr_t) &info))) { LOG_KILL_TRACEE("PTRACE_GET_SYSCALL_INFO: %m"); } ASSERT_EQ(expected_none_size, rc) { @@ -177,7 +188,7 @@ TEST(get_syscall_info) case SIGTRAP | 0x80: ASSERT_LT(0, (rc = sys_ptrace(PTRACE_GET_SYSCALL_INFO, pid, size, - (unsigned long) &info))) { + (uintptr_t) &info))) { LOG_KILL_TRACEE("PTRACE_GET_SYSCALL_INFO: %m"); } switch (ptrace_stop) { -- ldv

3 months, 4 weeks

3
7
0 0

[PATCH v9] Kunit to check the longest symbol length

by Sergio González Collado

The longest length of a symbol (KSYM_NAME_LEN) was increased to 512 in the reference [1]. This patch adds kunit test suite to check the longest symbol length. These tests verify that the longest symbol length defined is supported. This test can also help other efforts for longer symbol length, like [2]. The test suite defines one symbol with the longest possible length. The first test verify that functions with names of the created symbol, can be called or not. The second test, verify that the symbols are created (or not) in the kernel symbol table. [1] https://lore.kernel.org/lkml/20220802015052.10452-6-ojeda@kernel.org/ [2] https://lore.kernel.org/lkml/20240605032120.3179157-1-song@kernel.org/ Tested-by: Martin Rodriguez Reboredo <yakoyoku(a)gmail.com> Reviewed-by: Shuah Khan <skhan(a)linuxfoundation.org> Reviewed-by: Rae Moar <rmoar(a)google.com> Signed-off-by: Sergio González Collado <sergio.collado(a)gmail.com> Link: https://github.com/Rust-for-Linux/linux/issues/504 --- V8 -> V9: removed unused macro & corrected error message --- V7 -> V8: typo fixed & rebased --- V6 -> V7: rebased --- V5 -> V6: remove tests with symbols of length KSYM_NAME_LEN+1 --- V4 -> V5: fixed typo, added improved description --- V3 -> V4: add x86 mantainers, add new reference. --- V2 -> V3: updated base and added MODULE_DESCRIPTION() and MODULE_AUTHOR() --- V1 -> V2: corrected CI tests. Added fix proposed at [3] [3] https://lore.kernel.org/lkml/Y9ES4UKl%2F+DtvAVS@gmail.com/T/#m3ef0e12bb834d… The test execution should result in something like: ``` [20:04:35] =============== longest-symbol (4 subtests) ================ [20:04:35] [PASSED] test_longest_symbol [20:04:35] [PASSED] test_longest_symbol_kallsyms [20:04:35] ================= [PASSED] longest-symbol ================== [20:04:35] ============================================================ [20:04:35] Testing complete. Ran 4 tests: passed: 4 ``` --- arch/x86/tools/insn_decoder_test.c | 3 +- lib/Kconfig.debug | 9 ++++ lib/Makefile | 2 + lib/longest_symbol_kunit.c | 82 ++++++++++++++++++++++++++++++ 4 files changed, 95 insertions(+), 1 deletion(-) create mode 100644 lib/longest_symbol_kunit.c diff --git a/arch/x86/tools/insn_decoder_test.c b/arch/x86/tools/insn_decoder_test.c index 472540aeabc2..6c2986d2ad11 100644 --- a/arch/x86/tools/insn_decoder_test.c +++ b/arch/x86/tools/insn_decoder_test.c @@ -10,6 +10,7 @@ #include <assert.h> #include <unistd.h> #include <stdarg.h> +#include <linux/kallsyms.h> #define unlikely(cond) (cond) @@ -106,7 +107,7 @@ static void parse_args(int argc, char **argv) } } -#define BUFSIZE 256 +#define BUFSIZE (256 + KSYM_NAME_LEN) int main(int argc, char **argv) { diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 1af972a92d06..62d43aa9e8f0 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2838,6 +2838,15 @@ config FORTIFY_KUNIT_TEST by the str*() and mem*() family of functions. For testing runtime traps of FORTIFY_SOURCE, see LKDTM's "FORTIFY_*" tests. +config LONGEST_SYM_KUNIT_TEST + tristate "Test the longest symbol possible" if !KUNIT_ALL_TESTS + depends on KUNIT && KPROBES + default KUNIT_ALL_TESTS + help + Tests the longest symbol possible + + If unsure, say N. + config HW_BREAKPOINT_KUNIT_TEST bool "Test hw_breakpoint constraints accounting" if !KUNIT_ALL_TESTS depends on HAVE_HW_BREAKPOINT diff --git a/lib/Makefile b/lib/Makefile index d5cfc7afbbb8..e8fec9defec2 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -393,6 +393,8 @@ obj-$(CONFIG_FORTIFY_KUNIT_TEST) += fortify_kunit.o obj-$(CONFIG_CRC_KUNIT_TEST) += crc_kunit.o obj-$(CONFIG_SIPHASH_KUNIT_TEST) += siphash_kunit.o obj-$(CONFIG_USERCOPY_KUNIT_TEST) += usercopy_kunit.o +obj-$(CONFIG_LONGEST_SYM_KUNIT_TEST) += longest_symbol_kunit.o +CFLAGS_longest_symbol_kunit.o += $(call cc-disable-warning, missing-prototypes) obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o diff --git a/lib/longest_symbol_kunit.c b/lib/longest_symbol_kunit.c new file mode 100644 index 000000000000..e3c28ff1807f --- /dev/null +++ b/lib/longest_symbol_kunit.c @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test the longest symbol length. Execute with: + * ./tools/testing/kunit/kunit.py run longest-symbol + * --arch=x86_64 --kconfig_add CONFIG_KPROBES=y --kconfig_add CONFIG_MODULES=y + * --kconfig_add CONFIG_RETPOLINE=n --kconfig_add CONFIG_CFI_CLANG=n + * --kconfig_add CONFIG_MITIGATION_RETPOLINE=n + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <kunit/test.h> +#include <linux/stringify.h> +#include <linux/kprobes.h> +#include <linux/kallsyms.h> + +#define DI(name) s##name##name +#define DDI(name) DI(n##name##name) +#define DDDI(name) DDI(n##name##name) +#define DDDDI(name) DDDI(n##name##name) +#define DDDDDI(name) DDDDI(n##name##name) + +/*Generate a symbol whose name length is 511 */ +#define LONGEST_SYM_NAME DDDDDI(g1h2i3j4k5l6m7n) + +#define RETURN_LONGEST_SYM 0xAAAAA + +noinline int LONGEST_SYM_NAME(void); +noinline int LONGEST_SYM_NAME(void) +{ + return RETURN_LONGEST_SYM; +} + +_Static_assert(sizeof(__stringify(LONGEST_SYM_NAME)) == KSYM_NAME_LEN, +"Incorrect symbol length found. Expected KSYM_NAME_LEN: " +__stringify(KSYM_NAME_LEN) ", but found: " +__stringify(sizeof(LONGEST_SYM_NAME))); + +static void test_longest_symbol(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM, LONGEST_SYM_NAME()); +}; + +static void test_longest_symbol_kallsyms(struct kunit *test) +{ + unsigned long (*kallsyms_lookup_name)(const char *name); + static int (*longest_sym)(void); + + struct kprobe kp = { + .symbol_name = "kallsyms_lookup_name", + }; + + if (register_kprobe(&kp) < 0) { + pr_info("%s: kprobe not registered", __func__); + KUNIT_FAIL(test, "test_longest_symbol kallsyms: kprobe not registered\n"); + return; + } + + kunit_warn(test, "test_longest_symbol kallsyms: kprobe registered\n"); + kallsyms_lookup_name = (unsigned long (*)(const char *name))kp.addr; + unregister_kprobe(&kp); + + longest_sym = + (void *) kallsyms_lookup_name(__stringify(LONGEST_SYM_NAME)); + KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM, longest_sym()); +}; + +static struct kunit_case longest_symbol_test_cases[] = { + KUNIT_CASE(test_longest_symbol), + KUNIT_CASE(test_longest_symbol_kallsyms), + {} +}; + +static struct kunit_suite longest_symbol_test_suite = { + .name = "longest-symbol", + .test_cases = longest_symbol_test_cases, +}; +kunit_test_suite(longest_symbol_test_suite); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Test the longest symbol length"); +MODULE_AUTHOR("Sergio González Collado"); base-commit: 7eb172143d5508b4da468ed59ee857c6e5e01da6 -- 2.39.2

4 months

4
4
0 0

[PATCH bpf-next/net v3 0/5] bpf: Add mptcp_subflow bpf_iter support

by Matthieu Baerts (NGI0)

Here is a series from Geliang, adding mptcp_subflow bpf_iter support. We are working on extending MPTCP with BPF, e.g. to control the path manager -- in charge of the creation, deletion, and announcements of subflows (paths) -- and the packet scheduler -- in charge of selecting which available path the next data will be sent to. These extensions need to iterate over the list of subflows attached to an MPTCP connection, and do some specific actions via some new kfunc that will be added later on. This preparation work is split in different patches: - Patch 1: register some "basic" MPTCP kfunc. - Patch 2: add mptcp_subflow bpf_iter support. Note that previous versions of this single patch have already been shared to the BPF mailing list. The changelog has been kept with a comment, but the version number has been reset to avoid confusions. - Patch 3: add more MPTCP endpoints in the selftests, in order to create more than 2 subflows. - Patch 4: add a very simple test validating mptcp_subflow bpf_iter support. This test could be written without the new bpf_iter, but it is there only to make sure this specific feature works as expected. - Patch 5: a small fix to drop an unused parameter in the selftests. Signed-off-by: Matthieu Baerts (NGI0) <matttbe(a)kernel.org> --- Changes in v3: - Previous patches 1, 2 and 5 were no longer needed. (Martin) - Patch 2: Switch to 'struct sock' and drop unneeded checks. (Martin) - Patch 4: Adapt the test accordingly. - Patch 5: New small fix for the selftests. - Examples and questions for BPF maintainers have been added in Patch 2. - Link to v2: https://lore.kernel.org/r/20241219-bpf-next-net-mptcp-bpf_iter-subflows-v2-… Changes in v2: - Patches 1-2: new ones. - Patch 3: remove two kfunc, more restrictions. (Martin) - Patch 4: add BUILD_BUG_ON(), more restrictions. (Martin) - Patch 7: adaptations due to modifications in patches 1-4. - Link to v1: https://lore.kernel.org/r/20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-… --- Geliang Tang (5): bpf: Register mptcp common kfunc set bpf: Add mptcp_subflow bpf_iter selftests/bpf: More endpoints for endpoint_init selftests/bpf: Add mptcp_subflow bpf_iter subtest selftests/bpf: Drop cgroup_fd of run_mptcpify net/mptcp/bpf.c | 87 +++++++++++++- tools/testing/selftests/bpf/bpf_experimental.h | 8 ++ tools/testing/selftests/bpf/prog_tests/mptcp.c | 133 +++++++++++++++++++-- tools/testing/selftests/bpf/progs/mptcp_bpf.h | 4 + .../testing/selftests/bpf/progs/mptcp_bpf_iters.c | 59 +++++++++ 5 files changed, 282 insertions(+), 9 deletions(-) --- base-commit: dad704ebe38642cd405e15b9c51263356391355c change-id: 20241108-bpf-next-net-mptcp-bpf_iter-subflows-027f6d87770e Best regards, -- Matthieu Baerts (NGI0) <matttbe(a)kernel.org>

4 months, 1 week

3
11
0 0

[PATCH v2] drm/tests: Drop drm_kunit_helper_acquire_ctx_alloc()

by Maxime Ripard

lockdep complains when a lock is released in a separate thread the lock is taken in, and it turns out that kunit does run its actions in a separate thread than the test ran in. This means that drm_kunit_helper_acquire_ctx_alloc() just cannot work as it's supposed to, so let's just get rid of it. Suggested-by: Simona Vetter <simona.vetter(a)ffwll.ch> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)linaro.org> Signed-off-by: Maxime Ripard <mripard(a)kernel.org> --- Changes from v1: - Reworded the commit log (Sima) --- drivers/gpu/drm/tests/drm_atomic_state_test.c | 24 +- .../drm/tests/drm_hdmi_state_helper_test.c | 254 +++++++++++------- drivers/gpu/drm/tests/drm_kunit_helpers.c | 41 --- .../gpu/drm/vc4/tests/vc4_test_pv_muxing.c | 46 ++-- include/drm/drm_kunit_helpers.h | 2 - 5 files changed, 191 insertions(+), 176 deletions(-) diff --git a/drivers/gpu/drm/tests/drm_atomic_state_test.c b/drivers/gpu/drm/tests/drm_atomic_state_test.c index 5945c3298901..2f6ac7a09f44 100644 --- a/drivers/gpu/drm/tests/drm_atomic_state_test.c +++ b/drivers/gpu/drm/tests/drm_atomic_state_test.c @@ -187,11 +187,11 @@ static int set_up_atomic_state(struct kunit *test, * connectors are changed but the CRTC mode is not. */ static void drm_test_check_connector_changed_modeset(struct kunit *test) { struct drm_atomic_test_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector *old_conn, *new_conn; struct drm_atomic_state *state; struct drm_device *drm; struct drm_connector_state *new_conn_state, *old_conn_state; int ret, initial_modeset_count; @@ -201,18 +201,17 @@ static void drm_test_check_connector_changed_modeset(struct kunit *test) drm = &priv->drm; old_conn = &priv->connectors[0]; new_conn = &priv->connectors[1]; - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); // first modeset to enable - ret = set_up_atomic_state(test, priv, old_conn, ctx); + ret = set_up_atomic_state(test, priv, old_conn, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); new_conn_state = drm_atomic_get_connector_state(state, new_conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state); @@ -229,10 +228,13 @@ static void drm_test_check_connector_changed_modeset(struct kunit *test) // modeset_disables is called as part of the atomic commit tail ret = drm_atomic_commit(state); KUNIT_ASSERT_EQ(test, ret, 0); KUNIT_ASSERT_EQ(test, modeset_counter, initial_modeset_count + 1); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that the drm_crtc_in_clone_mode() helper can detect if a given CRTC * state is in clone mode @@ -261,27 +263,26 @@ static void drm_test_check_in_clone_mode(struct kunit *test) static void drm_test_check_valid_clones(struct kunit *test) { int ret; const struct drm_clone_mode_test *param = test->param_value; struct drm_atomic_test_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_device *drm; struct drm_atomic_state *state; struct drm_crtc_state *crtc_state; priv = drm_atomic_test_init_drm_components(test, false); KUNIT_ASSERT_NOT_NULL(test, priv); drm = &priv->drm; - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = set_up_atomic_state(test, priv, NULL, ctx); + ret = set_up_atomic_state(test, priv, NULL, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); crtc_state = drm_atomic_get_crtc_state(state, priv->crtc); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state); @@ -290,10 +291,13 @@ static void drm_test_check_valid_clones(struct kunit *test) // force modeset crtc_state->mode_changed = true; ret = drm_atomic_helper_check_modeset(drm, state); KUNIT_ASSERT_EQ(test, ret, param->expected_result); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } static void drm_check_in_clone_mode_desc(const struct drm_clone_mode_test *t, char *desc) { diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c index 23ecc00accb2..e97efd3af9ed 100644 --- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c +++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c @@ -271,11 +271,11 @@ drm_kunit_helper_connector_hdmi_init(struct kunit *test, * in turn disable/enable the connector. */ static void drm_test_check_broadcast_rgb_crtc_mode_changed(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *old_conn_state; struct drm_connector_state *new_conn_state; struct drm_crtc_state *crtc_state; struct drm_atomic_state *state; struct drm_display_mode *preferred; @@ -294,17 +294,16 @@ static void drm_test_check_broadcast_rgb_crtc_mode_changed(struct kunit *test) conn = &priv->connector; preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); new_conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state); @@ -325,21 +324,24 @@ static void drm_test_check_broadcast_rgb_crtc_mode_changed(struct kunit *test) KUNIT_EXPECT_EQ(test, new_conn_state->hdmi.broadcast_rgb, DRM_HDMI_BROADCAST_RGB_FULL); crtc_state = drm_atomic_get_new_crtc_state(state, crtc); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state); KUNIT_EXPECT_TRUE(test, crtc_state->mode_changed); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if we set the RGB quantization property to the same value, * we don't trigger a mode change on the connector's CRTC and leave the * connector unaffected. */ static void drm_test_check_broadcast_rgb_crtc_mode_not_changed(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *old_conn_state; struct drm_connector_state *new_conn_state; struct drm_crtc_state *crtc_state; struct drm_atomic_state *state; struct drm_display_mode *preferred; @@ -358,17 +360,16 @@ static void drm_test_check_broadcast_rgb_crtc_mode_not_changed(struct kunit *tes conn = &priv->connector; preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); new_conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state); @@ -391,21 +392,24 @@ static void drm_test_check_broadcast_rgb_crtc_mode_not_changed(struct kunit *tes new_conn_state->hdmi.broadcast_rgb); crtc_state = drm_atomic_get_new_crtc_state(state, crtc); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state); KUNIT_EXPECT_FALSE(test, crtc_state->mode_changed); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that for an HDMI connector, with an HDMI monitor, if the * Broadcast RGB property is set to auto with a mode that isn't the * VIC-1 mode, we will get a limited RGB Quantization Range. */ static void drm_test_check_broadcast_rgb_auto_cea_mode(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_atomic_state *state; struct drm_display_mode *preferred; struct drm_connector *conn; struct drm_device *drm; @@ -424,17 +428,16 @@ static void drm_test_check_broadcast_rgb_auto_cea_mode(struct kunit *test) preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); KUNIT_ASSERT_NE(test, drm_match_cea_mode(preferred), 1); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state); @@ -447,21 +450,24 @@ static void drm_test_check_broadcast_rgb_auto_cea_mode(struct kunit *test) conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state); KUNIT_EXPECT_TRUE(test, conn_state->hdmi.is_limited_range); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that for an HDMI connector, with an HDMI monitor, if the * Broadcast RGB property is set to auto with a VIC-1 mode, we will get * a full RGB Quantization Range. */ static void drm_test_check_broadcast_rgb_auto_cea_mode_vic_1(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_atomic_state *state; struct drm_display_mode *mode; struct drm_connector *conn; struct drm_device *drm; @@ -475,21 +481,20 @@ static void drm_test_check_broadcast_rgb_auto_cea_mode_vic_1(struct kunit *test) drm = &priv->drm; conn = &priv->connector; KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); mode = drm_kunit_display_mode_from_cea_vic(test, drm, 1); KUNIT_ASSERT_NOT_NULL(test, mode); crtc = priv->crtc; - ret = light_up_connector(test, drm, crtc, conn, mode, ctx); + ret = light_up_connector(test, drm, crtc, conn, mode, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state); @@ -502,21 +507,24 @@ static void drm_test_check_broadcast_rgb_auto_cea_mode_vic_1(struct kunit *test) conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state); KUNIT_EXPECT_FALSE(test, conn_state->hdmi.is_limited_range); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that for an HDMI connector, with an HDMI monitor, if the * Broadcast RGB property is set to full with a mode that isn't the * VIC-1 mode, we will get a full RGB Quantization Range. */ static void drm_test_check_broadcast_rgb_full_cea_mode(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_atomic_state *state; struct drm_display_mode *preferred; struct drm_connector *conn; struct drm_device *drm; @@ -535,17 +543,16 @@ static void drm_test_check_broadcast_rgb_full_cea_mode(struct kunit *test) preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); KUNIT_ASSERT_NE(test, drm_match_cea_mode(preferred), 1); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state); @@ -560,21 +567,24 @@ static void drm_test_check_broadcast_rgb_full_cea_mode(struct kunit *test) KUNIT_ASSERT_EQ(test, conn_state->hdmi.broadcast_rgb, DRM_HDMI_BROADCAST_RGB_FULL); KUNIT_EXPECT_FALSE(test, conn_state->hdmi.is_limited_range); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that for an HDMI connector, with an HDMI monitor, if the * Broadcast RGB property is set to full with a VIC-1 mode, we will get * a full RGB Quantization Range. */ static void drm_test_check_broadcast_rgb_full_cea_mode_vic_1(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_atomic_state *state; struct drm_display_mode *mode; struct drm_connector *conn; struct drm_device *drm; @@ -588,21 +598,20 @@ static void drm_test_check_broadcast_rgb_full_cea_mode_vic_1(struct kunit *test) drm = &priv->drm; conn = &priv->connector; KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); mode = drm_kunit_display_mode_from_cea_vic(test, drm, 1); KUNIT_ASSERT_NOT_NULL(test, mode); crtc = priv->crtc; - ret = light_up_connector(test, drm, crtc, conn, mode, ctx); + ret = light_up_connector(test, drm, crtc, conn, mode, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state); @@ -617,21 +626,24 @@ static void drm_test_check_broadcast_rgb_full_cea_mode_vic_1(struct kunit *test) KUNIT_ASSERT_EQ(test, conn_state->hdmi.broadcast_rgb, DRM_HDMI_BROADCAST_RGB_FULL); KUNIT_EXPECT_FALSE(test, conn_state->hdmi.is_limited_range); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that for an HDMI connector, with an HDMI monitor, if the * Broadcast RGB property is set to limited with a mode that isn't the * VIC-1 mode, we will get a limited RGB Quantization Range. */ static void drm_test_check_broadcast_rgb_limited_cea_mode(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_atomic_state *state; struct drm_display_mode *preferred; struct drm_connector *conn; struct drm_device *drm; @@ -650,17 +662,16 @@ static void drm_test_check_broadcast_rgb_limited_cea_mode(struct kunit *test) preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); KUNIT_ASSERT_NE(test, drm_match_cea_mode(preferred), 1); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state); @@ -675,21 +686,24 @@ static void drm_test_check_broadcast_rgb_limited_cea_mode(struct kunit *test) KUNIT_ASSERT_EQ(test, conn_state->hdmi.broadcast_rgb, DRM_HDMI_BROADCAST_RGB_LIMITED); KUNIT_EXPECT_TRUE(test, conn_state->hdmi.is_limited_range); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that for an HDMI connector, with an HDMI monitor, if the * Broadcast RGB property is set to limited with a VIC-1 mode, we will * get a limited RGB Quantization Range. */ static void drm_test_check_broadcast_rgb_limited_cea_mode_vic_1(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_atomic_state *state; struct drm_display_mode *mode; struct drm_connector *conn; struct drm_device *drm; @@ -703,21 +717,20 @@ static void drm_test_check_broadcast_rgb_limited_cea_mode_vic_1(struct kunit *te drm = &priv->drm; conn = &priv->connector; KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); mode = drm_kunit_display_mode_from_cea_vic(test, drm, 1); KUNIT_ASSERT_NOT_NULL(test, mode); crtc = priv->crtc; - ret = light_up_connector(test, drm, crtc, conn, mode, ctx); + ret = light_up_connector(test, drm, crtc, conn, mode, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state); @@ -732,21 +745,24 @@ static void drm_test_check_broadcast_rgb_limited_cea_mode_vic_1(struct kunit *te KUNIT_ASSERT_EQ(test, conn_state->hdmi.broadcast_rgb, DRM_HDMI_BROADCAST_RGB_LIMITED); KUNIT_EXPECT_TRUE(test, conn_state->hdmi.is_limited_range); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if we change the maximum bpc property to a different value, * we trigger a mode change on the connector's CRTC, which will in turn * disable/enable the connector. */ static void drm_test_check_output_bpc_crtc_mode_changed(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *old_conn_state; struct drm_connector_state *new_conn_state; struct drm_crtc_state *crtc_state; struct drm_atomic_state *state; struct drm_display_mode *preferred; @@ -769,17 +785,16 @@ static void drm_test_check_output_bpc_crtc_mode_changed(struct kunit *test) KUNIT_ASSERT_GT(test, ret, 0); preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); new_conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state); @@ -806,21 +821,24 @@ static void drm_test_check_output_bpc_crtc_mode_changed(struct kunit *test) new_conn_state->hdmi.output_bpc); crtc_state = drm_atomic_get_new_crtc_state(state, crtc); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state); KUNIT_EXPECT_TRUE(test, crtc_state->mode_changed); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if we set the output bpc property to the same value, we * don't trigger a mode change on the connector's CRTC and leave the * connector unaffected. */ static void drm_test_check_output_bpc_crtc_mode_not_changed(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *old_conn_state; struct drm_connector_state *new_conn_state; struct drm_crtc_state *crtc_state; struct drm_atomic_state *state; struct drm_display_mode *preferred; @@ -843,17 +861,16 @@ static void drm_test_check_output_bpc_crtc_mode_not_changed(struct kunit *test) KUNIT_ASSERT_GT(test, ret, 0); preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); new_conn_state = drm_atomic_get_connector_state(state, conn); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state); @@ -878,20 +895,23 @@ static void drm_test_check_output_bpc_crtc_mode_not_changed(struct kunit *test) new_conn_state->hdmi.output_bpc); crtc_state = drm_atomic_get_new_crtc_state(state, crtc); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state); KUNIT_EXPECT_FALSE(test, crtc_state->mode_changed); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if we have an HDMI connector but a !HDMI display, we always * output RGB with 8 bpc. */ static void drm_test_check_output_bpc_dvi(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_info *info; struct drm_display_mode *preferred; struct drm_connector *conn; struct drm_device *drm; @@ -917,31 +937,33 @@ static void drm_test_check_output_bpc_dvi(struct kunit *test) KUNIT_ASSERT_FALSE(test, info->is_hdmi); preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_bpc, 8); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that when doing a commit which would use RGB 8bpc, the TMDS * clock rate stored in the connector state is equal to the mode clock */ static void drm_test_check_tmds_char_rate_rgb_8bpc(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_mode *preferred; struct drm_connector *conn; struct drm_device *drm; struct drm_crtc *crtc; @@ -962,33 +984,35 @@ static void drm_test_check_tmds_char_rate_rgb_8bpc(struct kunit *test) preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); KUNIT_ASSERT_FALSE(test, preferred->flags & DRM_MODE_FLAG_DBLCLK); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_ASSERT_EQ(test, conn_state->hdmi.output_bpc, 8); KUNIT_ASSERT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); KUNIT_EXPECT_EQ(test, conn_state->hdmi.tmds_char_rate, preferred->clock * 1000); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that when doing a commit which would use RGB 10bpc, the TMDS * clock rate stored in the connector state is equal to 1.25 times the * mode pixel clock */ static void drm_test_check_tmds_char_rate_rgb_10bpc(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_mode *preferred; struct drm_connector *conn; struct drm_device *drm; struct drm_crtc *crtc; @@ -1009,33 +1033,35 @@ static void drm_test_check_tmds_char_rate_rgb_10bpc(struct kunit *test) preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); KUNIT_ASSERT_FALSE(test, preferred->flags & DRM_MODE_FLAG_DBLCLK); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_ASSERT_EQ(test, conn_state->hdmi.output_bpc, 10); KUNIT_ASSERT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); KUNIT_EXPECT_EQ(test, conn_state->hdmi.tmds_char_rate, preferred->clock * 1250); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that when doing a commit which would use RGB 12bpc, the TMDS * clock rate stored in the connector state is equal to 1.5 times the * mode pixel clock */ static void drm_test_check_tmds_char_rate_rgb_12bpc(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_mode *preferred; struct drm_connector *conn; struct drm_device *drm; struct drm_crtc *crtc; @@ -1056,22 +1082,24 @@ static void drm_test_check_tmds_char_rate_rgb_12bpc(struct kunit *test) preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); KUNIT_ASSERT_FALSE(test, preferred->flags & DRM_MODE_FLAG_DBLCLK); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_ASSERT_EQ(test, conn_state->hdmi.output_bpc, 12); KUNIT_ASSERT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); KUNIT_EXPECT_EQ(test, conn_state->hdmi.tmds_char_rate, preferred->clock * 1500); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if we filter a rate through our hook, it's indeed rejected * by the whole atomic_check logic. @@ -1081,11 +1109,11 @@ static void drm_test_check_tmds_char_rate_rgb_12bpc(struct kunit *test) * again to see if it fails as it should. */ static void drm_test_check_hdmi_funcs_reject_rate(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_atomic_state *state; struct drm_display_mode *preferred; struct drm_crtc_state *crtc_state; struct drm_connector *conn; struct drm_device *drm; @@ -1102,29 +1130,31 @@ static void drm_test_check_hdmi_funcs_reject_rate(struct kunit *test) conn = &priv->connector; preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); /* You shouldn't be doing that at home. */ conn->hdmi.funcs = &reject_connector_hdmi_funcs; - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); crtc_state = drm_atomic_get_crtc_state(state, crtc); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state); crtc_state->connectors_changed = true; ret = drm_atomic_check_only(state); KUNIT_EXPECT_LT(test, ret, 0); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if: * - We have an HDMI connector supporting RGB only @@ -1137,11 +1167,11 @@ static void drm_test_check_hdmi_funcs_reject_rate(struct kunit *test) * will be equal to 1.25 times the mode pixel clock. */ static void drm_test_check_max_tmds_rate_bpc_fallback(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_info *info; struct drm_display_mode *preferred; unsigned long long rate; struct drm_connector *conn; @@ -1174,22 +1204,24 @@ static void drm_test_check_max_tmds_rate_bpc_fallback(struct kunit *test) KUNIT_ASSERT_GT(test, rate, info->max_tmds_clock * 1000); rate = drm_hdmi_compute_mode_clock(preferred, 10, HDMI_COLORSPACE_RGB); KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_EXPECT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_bpc, 10); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); KUNIT_EXPECT_EQ(test, conn_state->hdmi.tmds_char_rate, preferred->clock * 1250); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if: * - We have an HDMI connector supporting both RGB and YUV422 and up to @@ -1204,11 +1236,11 @@ static void drm_test_check_max_tmds_rate_bpc_fallback(struct kunit *test) * picking YUV422. */ static void drm_test_check_max_tmds_rate_format_fallback(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_info *info; struct drm_display_mode *preferred; unsigned long long rate; struct drm_connector *conn; @@ -1246,32 +1278,34 @@ static void drm_test_check_max_tmds_rate_format_fallback(struct kunit *test) KUNIT_ASSERT_GT(test, rate, info->max_tmds_clock * 1000); rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_YUV422); KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_EXPECT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_bpc, 10); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if a driver and screen supports RGB and YUV formats, and we * try to set the VIC 1 mode, we end up with 8bpc RGB even if we could * have had a higher bpc. */ static void drm_test_check_output_bpc_format_vic_1(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_info *info; struct drm_display_mode *mode; unsigned long long rate; struct drm_connector *conn; @@ -1308,32 +1342,34 @@ static void drm_test_check_output_bpc_format_vic_1(struct kunit *test) * Thus, we have to calculate the rate by hand. */ rate = mode->clock * 1500; KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); crtc = priv->crtc; - ret = light_up_connector(test, drm, crtc, conn, mode, ctx); + ret = light_up_connector(test, drm, crtc, conn, mode, &ctx); KUNIT_EXPECT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_bpc, 8); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if a driver supports only RGB but the screen also supports * YUV formats, we only end up with an RGB format. */ static void drm_test_check_output_bpc_format_driver_rgb_only(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_info *info; struct drm_display_mode *preferred; unsigned long long rate; struct drm_connector *conn; @@ -1374,31 +1410,33 @@ static void drm_test_check_output_bpc_format_driver_rgb_only(struct kunit *test) KUNIT_ASSERT_GT(test, rate, info->max_tmds_clock * 1000); rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_YUV422); KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_EXPECT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_EXPECT_LT(test, conn_state->hdmi.output_bpc, 12); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if a screen supports only RGB but the driver also supports * YUV formats, we only end up with an RGB format. */ static void drm_test_check_output_bpc_format_display_rgb_only(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_info *info; struct drm_display_mode *preferred; unsigned long long rate; struct drm_connector *conn; @@ -1441,32 +1479,34 @@ static void drm_test_check_output_bpc_format_display_rgb_only(struct kunit *test KUNIT_ASSERT_GT(test, rate, info->max_tmds_clock * 1000); rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_YUV422); KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_EXPECT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_EXPECT_LT(test, conn_state->hdmi.output_bpc, 12); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if a display supports higher bpc but the driver only * supports 8 bpc, we only end up with 8 bpc even if we could have had a * higher bpc. */ static void drm_test_check_output_bpc_format_driver_8bpc_only(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_info *info; struct drm_display_mode *preferred; unsigned long long rate; struct drm_connector *conn; @@ -1499,32 +1539,34 @@ static void drm_test_check_output_bpc_format_driver_8bpc_only(struct kunit *test * clock to actually use 12bpc. */ rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_RGB); KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_EXPECT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_bpc, 8); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if a driver supports higher bpc but the display only * supports 8 bpc, we only end up with 8 bpc even if we could have had a * higher bpc. */ static void drm_test_check_output_bpc_format_display_8bpc_only(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_display_info *info; struct drm_display_mode *preferred; unsigned long long rate; struct drm_connector *conn; @@ -1559,28 +1601,30 @@ static void drm_test_check_output_bpc_format_display_8bpc_only(struct kunit *tes * clock to actually use 12bpc. */ rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_RGB); KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_EXPECT_EQ(test, ret, 0); conn_state = conn->state; KUNIT_ASSERT_NOT_NULL(test, conn_state); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_bpc, 8); KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* Test that atomic check succeeds when disabling a connector. */ static void drm_test_check_disable_connector(struct kunit *test) { struct drm_atomic_helper_connector_hdmi_priv *priv; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_connector_state *conn_state; struct drm_crtc_state *crtc_state; struct drm_atomic_state *state; struct drm_display_mode *preferred; struct drm_connector *conn; @@ -1591,23 +1635,22 @@ static void drm_test_check_disable_connector(struct kunit *test) priv = drm_kunit_helper_connector_hdmi_init(test, BIT(HDMI_COLORSPACE_RGB), 8); KUNIT_ASSERT_NOT_NULL(test, priv); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); conn = &priv->connector; preferred = find_preferred_mode(conn); KUNIT_ASSERT_NOT_NULL(test, preferred); drm = &priv->drm; crtc = priv->crtc; - ret = light_up_connector(test, drm, crtc, conn, preferred, ctx); + ret = light_up_connector(test, drm, crtc, conn, preferred, &ctx); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); crtc_state = drm_atomic_get_crtc_state(state, crtc); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state); @@ -1621,10 +1664,13 @@ static void drm_test_check_disable_connector(struct kunit *test) ret = drm_atomic_set_crtc_for_connector(conn_state, NULL); KUNIT_EXPECT_EQ(test, ret, 0); ret = drm_atomic_check_only(state); KUNIT_ASSERT_EQ(test, ret, 0); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } static struct kunit_case drm_atomic_helper_connector_hdmi_check_tests[] = { KUNIT_CASE(drm_test_check_broadcast_rgb_auto_cea_mode), KUNIT_CASE(drm_test_check_broadcast_rgb_auto_cea_mode_vic_1), diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c index 3c0b7824c0be..a4eb68f0decc 100644 --- a/drivers/gpu/drm/tests/drm_kunit_helpers.c +++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c @@ -78,51 +78,10 @@ __drm_kunit_helper_alloc_drm_device_with_driver(struct kunit *test, return drm; } EXPORT_SYMBOL_GPL(__drm_kunit_helper_alloc_drm_device_with_driver); -static void action_drm_release_context(void *ptr) -{ - struct drm_modeset_acquire_ctx *ctx = ptr; - - drm_modeset_drop_locks(ctx); - drm_modeset_acquire_fini(ctx); -} - -/** - * drm_kunit_helper_acquire_ctx_alloc - Allocates an acquire context - * @test: The test context object - * - * Allocates and initializes a modeset acquire context. - * - * The context is tied to the kunit test context, so we must not call - * drm_modeset_acquire_fini() on it, it will be done so automatically. - * - * Returns: - * An ERR_PTR on error, a pointer to the newly allocated context otherwise - */ -struct drm_modeset_acquire_ctx * -drm_kunit_helper_acquire_ctx_alloc(struct kunit *test) -{ - struct drm_modeset_acquire_ctx *ctx; - int ret; - - ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); - KUNIT_ASSERT_NOT_NULL(test, ctx); - - drm_modeset_acquire_init(ctx, 0); - - ret = kunit_add_action_or_reset(test, - action_drm_release_context, - ctx); - if (ret) - return ERR_PTR(ret); - - return ctx; -} -EXPORT_SYMBOL_GPL(drm_kunit_helper_acquire_ctx_alloc); - static void kunit_action_drm_atomic_state_put(void *ptr) { struct drm_atomic_state *state = ptr; drm_atomic_state_put(state); diff --git a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c index 40a05869a50e..992e8f5c5c6e 100644 --- a/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c +++ b/drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c @@ -722,11 +722,11 @@ static void drm_vc4_test_pv_muxing_invalid(struct kunit *test) } static int vc4_pv_muxing_test_init(struct kunit *test) { const struct pv_muxing_param *params = test->param_value; - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct pv_muxing_priv *priv; struct drm_device *drm; struct vc4_dev *vc4; priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL); @@ -735,17 +735,19 @@ static int vc4_pv_muxing_test_init(struct kunit *test) vc4 = params->mock_fn(test); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4); priv->vc4 = vc4; - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); drm = &vc4->base; - priv->state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + priv->state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->state); + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + return 0; } static struct kunit_case vc4_pv_muxing_tests[] = { KUNIT_CASE_PARAM(drm_vc4_test_pv_muxing, @@ -780,11 +782,11 @@ static struct kunit_suite vc5_pv_muxing_test_suite = { * and * https://lore.kernel.org/dri-devel/20200917121623.42023-1-maxime@cerno.tech/ */ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *test) { - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_atomic_state *state; struct vc4_crtc_state *new_vc4_crtc_state; struct vc4_hvs_state *new_hvs_state; unsigned int hdmi0_channel; unsigned int hdmi1_channel; @@ -793,15 +795,14 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes int ret; vc4 = vc5_mock_device(test); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); drm = &vc4->base; - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0); KUNIT_ASSERT_EQ(test, ret, 0); @@ -820,11 +821,11 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes KUNIT_ASSERT_TRUE(test, new_hvs_state->fifo_state[hdmi0_channel].in_use); ret = drm_atomic_helper_swap_state(state, false); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI1); KUNIT_ASSERT_EQ(test, ret, 0); @@ -841,10 +842,13 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes hdmi1_channel = new_vc4_crtc_state->assigned_channel; KUNIT_ASSERT_NE(test, hdmi1_channel, VC4_HVS_CHANNEL_DISABLED); KUNIT_ASSERT_TRUE(test, new_hvs_state->fifo_state[hdmi1_channel].in_use); KUNIT_EXPECT_NE(test, hdmi0_channel, hdmi1_channel); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * This test makes sure that we never change the FIFO of an active HVS * channel if we disable a FIFO with a lower index. @@ -852,11 +856,11 @@ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable(struct kunit *tes * Doing so would result in a FIFO stall and would disrupt an output * supposed to be unaffected by the commit. */ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test) { - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_atomic_state *state; struct vc4_crtc_state *new_vc4_crtc_state; struct vc4_hvs_state *new_hvs_state; unsigned int old_hdmi0_channel; unsigned int old_hdmi1_channel; @@ -865,15 +869,14 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test) int ret; vc4 = vc5_mock_device(test); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); drm = &vc4->base; - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0); KUNIT_ASSERT_EQ(test, ret, 0); @@ -903,11 +906,11 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test) KUNIT_ASSERT_TRUE(test, new_hvs_state->fifo_state[old_hdmi1_channel].in_use); ret = drm_atomic_helper_swap_state(state, false); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); ret = vc4_mock_atomic_del_output(test, state, VC4_ENCODER_TYPE_HDMI0); KUNIT_ASSERT_EQ(test, ret, 0); @@ -927,10 +930,13 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test) KUNIT_ASSERT_NE(test, hdmi1_channel, VC4_HVS_CHANNEL_DISABLED); KUNIT_ASSERT_TRUE(test, new_hvs_state->fifo_state[hdmi1_channel].in_use); KUNIT_EXPECT_EQ(test, old_hdmi1_channel, hdmi1_channel); } + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } /* * Test that if we affect a single output, only the CRTC state of that * output will be pulled in the global atomic state. @@ -947,25 +953,24 @@ static void drm_test_vc5_pv_muxing_bugs_stable_fifo(struct kunit *test) * inactive CRTC that never completes. */ static void drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct kunit *test) { - struct drm_modeset_acquire_ctx *ctx; + struct drm_modeset_acquire_ctx ctx; struct drm_atomic_state *state; struct vc4_crtc_state *new_vc4_crtc_state; struct drm_device *drm; struct vc4_dev *vc4; int ret; vc4 = vc5_mock_device(test); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vc4); - ctx = drm_kunit_helper_acquire_ctx_alloc(test); - KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + drm_modeset_acquire_init(&ctx, 0); drm = &vc4->base; - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI0); KUNIT_ASSERT_EQ(test, ret, 0); @@ -973,11 +978,11 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku KUNIT_ASSERT_EQ(test, ret, 0); ret = drm_atomic_helper_swap_state(state, false); KUNIT_ASSERT_EQ(test, ret, 0); - state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx); + state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state); ret = vc4_mock_atomic_add_output(test, state, VC4_ENCODER_TYPE_HDMI1); KUNIT_ASSERT_EQ(test, ret, 0); @@ -985,10 +990,13 @@ drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state(struct ku KUNIT_ASSERT_EQ(test, ret, 0); new_vc4_crtc_state = get_vc4_crtc_state_for_encoder(test, state, VC4_ENCODER_TYPE_HDMI0); KUNIT_EXPECT_NULL(test, new_vc4_crtc_state); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); } static struct kunit_case vc5_pv_muxing_bugs_tests[] = { KUNIT_CASE(drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable), KUNIT_CASE(drm_test_vc5_pv_muxing_bugs_subsequent_crtc_enable_too_many_crtc_state), diff --git a/include/drm/drm_kunit_helpers.h b/include/drm/drm_kunit_helpers.h index afdd46ef04f7..11d59ce0bac0 100644 --- a/include/drm/drm_kunit_helpers.h +++ b/include/drm/drm_kunit_helpers.h @@ -93,12 +93,10 @@ __drm_kunit_helper_alloc_drm_device(struct kunit *test, #define drm_kunit_helper_alloc_drm_device(_test, _dev, _type, _member, _feat) \ ((_type *)__drm_kunit_helper_alloc_drm_device(_test, _dev, \ sizeof(_type), \ offsetof(_type, _member), \ _feat)) -struct drm_modeset_acquire_ctx * -drm_kunit_helper_acquire_ctx_alloc(struct kunit *test); struct drm_atomic_state * drm_kunit_helper_atomic_state_alloc(struct kunit *test, struct drm_device *drm, struct drm_modeset_acquire_ctx *ctx); -- 2.48.1

4 months, 1 week

2
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[RFC PATCH 00/39] 1G page support for guest_memfd

by Ackerley Tng

Hello, This patchset is our exploration of how to support 1G pages in guest_memfd, and how the pages will be used in Confidential VMs. The patchset covers: + How to get 1G pages + Allowing mmap() of guest_memfd to userspace so that both private and shared memory can use the same physical pages + Splitting and reconstructing pages to support conversions and mmap() + How the VM, userspace and guest_memfd interact to support conversions + Selftests to test all the above + Selftests also demonstrate the conversion flow between VM, userspace and guest_memfd. Why 1G pages in guest memfd? Bring guest_memfd to performance and memory savings parity with VMs that are backed by HugeTLBfs. + Performance is improved with 1G pages by more TLB hits and faster page walks on TLB misses. + Memory savings from 1G pages comes from HugeTLB Vmemmap Optimization (HVO). Options for 1G page support: 1. HugeTLB 2. Contiguous Memory Allocator (CMA) 3. Other suggestions are welcome! Comparison between options: 1. HugeTLB + Refactor HugeTLB to separate allocator from the rest of HugeTLB + Pro: Graceful transition for VMs backed with HugeTLB to guest_memfd + Near term: Allows co-tenancy of HugeTLB and guest_memfd backed VMs + Pro: Can provide iterative steps toward new future allocator + Unexplored: Managing userspace-visible changes + e.g. HugeTLB's free_hugepages will decrease if HugeTLB is used, but not when future allocator is used 2. CMA + Port some HugeTLB features to be applied on CMA + Pro: Clean slate What would refactoring HugeTLB involve? (Some refactoring was done in this RFC, more can be done.) 1. Broadly involves separating the HugeTLB allocator from the rest of HugeTLB + Brings more modularity to HugeTLB + No functionality change intended + Likely step towards HugeTLB's integration into core-mm 2. guest_memfd will use just the allocator component of HugeTLB, not including the complex parts of HugeTLB like + Userspace reservations (resv_map) + Shared PMD mappings + Special page walkers What features would need to be ported to CMA? + Improved allocation guarantees + Per NUMA node pool of huge pages + Subpools per guest_memfd + Memory savings + Something like HugeTLB Vmemmap Optimization + Configuration/reporting features + Configuration of number of pages available (and per NUMA node) at and after host boot + Reporting of memory usage/availability statistics at runtime HugeTLB was picked as the source of 1G pages for this RFC because it allows a graceful transition, and retains memory savings from HVO. To illustrate this, if a host machine uses HugeTLBfs to back VMs, and a confidential VM were to be scheduled on that host, some HugeTLBfs pages would have to be given up and returned to CMA for guest_memfd pages to be rebuilt from that memory. This requires memory to be reserved for HVO to be removed and reapplied on the new guest_memfd memory. This not only slows down memory allocation but also trims the benefits of HVO. Memory would have to be reserved on the host to facilitate these transitions. Improving how guest_memfd uses the allocator in a future revision of this RFC: To provide an easier transition away from HugeTLB, guest_memfd's use of HugeTLB should be limited to these allocator functions: + reserve(node, page_size, num_pages) => opaque handle + Used when a guest_memfd inode is created to reserve memory from backend allocator + allocate(handle, mempolicy, page_size) => folio + To allocate a folio from guest_memfd's reservation + split(handle, folio, target_page_size) => void + To take a huge folio, and split it to smaller folios, restore to filemap + reconstruct(handle, first_folio, nr_pages) => void + To take a folio, and reconstruct a huge folio out of nr_pages from the first_folio + free(handle, folio) => void + To return folio to guest_memfd's reservation + error(handle, folio) => void + To handle memory errors + unreserve(handle) => void + To return guest_memfd's reservation to allocator backend Userspace should only provide a page size when creating a guest_memfd and should not have to specify HugeTLB. Overview of patches: + Patches 01-12 + Many small changes to HugeTLB, mostly to separate HugeTLBfs concepts from HugeTLB, and to expose HugeTLB functions. + Patches 13-16 + Letting guest_memfd use HugeTLB + Creation of each guest_memfd reserves pages from HugeTLB's global hstate and puts it into the guest_memfd inode's subpool + Each folio allocation takes a page from the guest_memfd inode's subpool + Patches 17-21 + Selftests for new HugeTLB features in guest_memfd + Patches 22-24 + More small changes on the HugeTLB side to expose functions needed by guest_memfd + Patch 25: + Uses the newly available functions from patches 22-24 to split HugeTLB pages. In this patch, HugeTLB folios are always split to 4K before any usage, private or shared. + Patches 26-28 + Allow mmap() in guest_memfd and faulting in shared pages + Patch 29 + Enables conversion between private/shared pages + Patch 30 + Required to zero folios after conversions to avoid leaking initialized kernel memory + Patch 31-38 + Add selftests to test mapping pages to userspace, guest/host memory sharing and update conversions tests + Patch 33 illustrates the conversion flow between VM/userspace/guest_memfd + Patch 39 + Dynamically split and reconstruct HugeTLB pages instead of always splitting before use. All earlier selftests are expected to still pass. TODOs: + Add logic to wait for safe_refcount [1] + Look into lazy splitting/reconstruction of pages + Currently, when the KVM_SET_MEMORY_ATTRIBUTES is invoked, not only is the mem_attr_array and faultability updated, the pages in the requested range are also split/reconstructed as necessary. We want to look into delaying splitting/reconstruction to fault time. + Solve race between folios being faulted in and being truncated + When running private_mem_conversions_test with more than 1 vCPU, a folio getting truncated may get faulted in by another process, causing elevated mapcounts when the folio is freed (VM_BUG_ON_FOLIO). + Add intermediate splits (1G should first split to 2M and not split directly to 4K) + Use guest's lock instead of hugetlb_lock + Use multi-index xarray/replace xarray with some other data struct for faultability flag + Refactor HugeTLB better, present generic allocator interface Please let us know your thoughts on: + HugeTLB as the choice of transitional allocator backend + Refactoring HugeTLB to provide generic allocator interface + Shared/private conversion flow + Requiring user to request kernel to unmap pages from userspace using madvise(MADV_DONTNEED) + Failing conversion on elevated mapcounts/pincounts/refcounts + Process of splitting/reconstructing page + Anything else! [1] https://lore.kernel.org/all/20240829-guest-memfd-lib-v2-0-b9afc1ff3656@quic… Ackerley Tng (37): mm: hugetlb: Simplify logic in dequeue_hugetlb_folio_vma() mm: hugetlb: Refactor vma_has_reserves() to should_use_hstate_resv() mm: hugetlb: Remove unnecessary check for avoid_reserve mm: mempolicy: Refactor out policy_node_nodemask() mm: hugetlb: Refactor alloc_buddy_hugetlb_folio_with_mpol() to interpret mempolicy instead of vma mm: hugetlb: Refactor dequeue_hugetlb_folio_vma() to use mpol mm: hugetlb: Refactor out hugetlb_alloc_folio mm: truncate: Expose preparation steps for truncate_inode_pages_final mm: hugetlb: Expose hugetlb_subpool_{get,put}_pages() mm: hugetlb: Add option to create new subpool without using surplus mm: hugetlb: Expose hugetlb_acct_memory() mm: hugetlb: Move and expose hugetlb_zero_partial_page() KVM: guest_memfd: Make guest mem use guest mem inodes instead of anonymous inodes KVM: guest_memfd: hugetlb: initialization and cleanup KVM: guest_memfd: hugetlb: allocate and truncate from hugetlb KVM: guest_memfd: Add page alignment check for hugetlb guest_memfd KVM: selftests: Add basic selftests for hugetlb-backed guest_memfd KVM: selftests: Support various types of backing sources for private memory KVM: selftests: Update test for various private memory backing source types KVM: selftests: Add private_mem_conversions_test.sh KVM: selftests: Test that guest_memfd usage is reported via hugetlb mm: hugetlb: Expose vmemmap optimization functions mm: hugetlb: Expose HugeTLB functions for promoting/demoting pages mm: hugetlb: Add functions to add/move/remove from hugetlb lists KVM: guest_memfd: Track faultability within a struct kvm_gmem_private KVM: guest_memfd: Allow mmapping guest_memfd files KVM: guest_memfd: Use vm_type to determine default faultability KVM: Handle conversions in the SET_MEMORY_ATTRIBUTES ioctl KVM: guest_memfd: Handle folio preparation for guest_memfd mmap KVM: selftests: Allow vm_set_memory_attributes to be used without asserting return value of 0 KVM: selftests: Test using guest_memfd memory from userspace KVM: selftests: Test guest_memfd memory sharing between guest and host KVM: selftests: Add notes in private_mem_kvm_exits_test for mmap-able guest_memfd KVM: selftests: Test that pinned pages block KVM from setting memory attributes to PRIVATE KVM: selftests: Refactor vm_mem_add to be more flexible KVM: selftests: Add helper to perform madvise by memslots KVM: selftests: Update private_mem_conversions_test for mmap()able guest_memfd Vishal Annapurve (2): KVM: guest_memfd: Split HugeTLB pages for guest_memfd use KVM: guest_memfd: Dynamically split/reconstruct HugeTLB page fs/hugetlbfs/inode.c | 35 +- include/linux/hugetlb.h | 54 +- include/linux/kvm_host.h | 1 + include/linux/mempolicy.h | 2 + include/linux/mm.h | 1 + include/uapi/linux/kvm.h | 26 + include/uapi/linux/magic.h | 1 + mm/hugetlb.c | 346 ++-- mm/hugetlb_vmemmap.h | 11 - mm/mempolicy.c | 36 +- mm/truncate.c | 26 +- tools/include/linux/kernel.h | 4 +- tools/testing/selftests/kvm/Makefile | 3 + .../kvm/guest_memfd_hugetlb_reporting_test.c | 222 +++ .../selftests/kvm/guest_memfd_pin_test.c | 104 ++ .../selftests/kvm/guest_memfd_sharing_test.c | 160 ++ .../testing/selftests/kvm/guest_memfd_test.c | 238 ++- .../testing/selftests/kvm/include/kvm_util.h | 45 +- .../testing/selftests/kvm/include/test_util.h | 18 + tools/testing/selftests/kvm/lib/kvm_util.c | 443 +++-- tools/testing/selftests/kvm/lib/test_util.c | 99 ++ .../kvm/x86_64/private_mem_conversions_test.c | 158 +- .../x86_64/private_mem_conversions_test.sh | 91 + .../kvm/x86_64/private_mem_kvm_exits_test.c | 11 +- virt/kvm/guest_memfd.c | 1563 ++++++++++++++++- virt/kvm/kvm_main.c | 17 + virt/kvm/kvm_mm.h | 16 + 27 files changed, 3288 insertions(+), 443 deletions(-) create mode 100644 tools/testing/selftests/kvm/guest_memfd_hugetlb_reporting_test.c create mode 100644 tools/testing/selftests/kvm/guest_memfd_pin_test.c create mode 100644 tools/testing/selftests/kvm/guest_memfd_sharing_test.c create mode 100755 tools/testing/selftests/kvm/x86_64/private_mem_conversions_test.sh -- 2.46.0.598.g6f2099f65c-goog

4 months, 2 weeks

17
129
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