Linux kernel with personal config changes for arch linux http://git.tablaster.dev/blaster4385/linux-IllusionX/atom?h=v6.12.1 2024-11-12T08:35:39Z 2024-11-12T08:35:39Z Bibo Mao maobibo@loongson.cn 2024-11-12T08:35:39Z urn:sha1:6ce031e5d6f475d476bab55ab7d8ea168fedc4c1 Native IPI is used for AP booting, because it is the booting interface between OS and BIOS firmware. The paravirt IPI is only used inside OS, and native IPI is necessary to boot AP. When booting AP, we write the kernel entry address in the HW mailbox of AP and send IPI interrupt to it. AP executes idle instruction and waits for interrupts or SW events, then clears IPI interrupt and jumps to the kernel entry from HW mailbox. Between writing HW mailbox and sending IPI, AP can be woken up by SW events and jumps to the kernel entry, so ACTION_BOOT_CPU IPI interrupt will keep pending during AP booting. And native IPI interrupt handler needs be registered so that it can clear pending native IPI, else there will be endless interrupts during AP booting stage. Here native IPI interrupt is initialized even if paravirt IPI is used. Cc: stable@vger.kernel.org Fixes: 74c16b2e2b0c ("LoongArch: KVM: Add PV IPI support on guest side") Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-11-12T08:35:36Z Huacai Chen chenhuacai@loongson.cn 2024-11-12T08:35:36Z urn:sha1:30cec747d6bf2c3e915c075d76d9712e54cde0a6 early_numa_add_cpu() applies on physical CPU id rather than logical CPU id, so use cpuid instead of cpu. Cc: stable@vger.kernel.org Fixes: 3de9c42d02a79a5 ("LoongArch: Add all CPUs enabled by fdt to NUMA node 0") Reported-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-11-12T08:35:36Z Huacai Chen chenhuacai@loongson.cn 2024-11-12T08:35:36Z urn:sha1:a6654a40a852a4ca18aacced4cf5ca87997818d7 In order to support ACPI-based physical CPU hotplug, we suppose for all "possible" CPUs cpu_logical_map() can work. Because some drivers want to use cpu_logical_map() for all "possible" CPUs, while currently we only setup logical-physical mapping for "present" CPUs. This lack of mapping also causes cpu_to_node() cannot work for hot-added CPUs. All "possible" CPUs are listed in MADT, and the "present" subset is marked as ACPI_MADT_ENABLED. To setup logical-physical CPU mapping for all possible CPUs and keep present CPUs continuous in cpu_present_mask, we parse MADT twice. The first pass handles CPUs with ACPI_MADT_ENABLED and the second pass handles CPUs without ACPI_MADT_ENABLED. The global flag (cpu_enumerated) is removed because acpi_map_cpu() calls cpu_number_map() rather than set_processor_mask() now. Reported-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-10-21T14:11:19Z Thomas Weißschuh thomas.weissschuh@linutronix.de 2024-10-21T14:11:19Z urn:sha1:134475a9ab8487527238d270639a8cb74c10aab2 Not all tasks have a vDSO mapped, for example kthreads never do. If such a task ever ends up calling stack_top(), it will derefence the NULL vdso pointer and crash. This can for example happen when using kunit: [<9000000000203874>] stack_top+0x58/0xa8 [<90000000002956cc>] arch_pick_mmap_layout+0x164/0x220 [<90000000003c284c>] kunit_vm_mmap_init+0x108/0x12c [<90000000003c1fbc>] __kunit_add_resource+0x38/0x8c [<90000000003c2704>] kunit_vm_mmap+0x88/0xc8 [<9000000000410b14>] usercopy_test_init+0xbc/0x25c [<90000000003c1db4>] kunit_try_run_case+0x5c/0x184 [<90000000003c3d54>] kunit_generic_run_threadfn_adapter+0x24/0x48 [<900000000022e4bc>] kthread+0xc8/0xd4 [<9000000000200ce8>] ret_from_kernel_thread+0xc/0xa4 Fixes: 803b0fc5c3f2 ("LoongArch: Add process management") Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-10-21T14:11:19Z Huacai Chen chenhuacai@loongson.cn 2024-10-21T14:11:19Z urn:sha1:2ed119aef60d73d00371195fc84dd68248071100 The current size of vDSO code mapping is hardcoded to PAGE_SIZE. This cannot work for 4KB page size after commit 18efd0b10e0fd77 ("LoongArch: vDSO: Wire up getrandom() vDSO implementation") because the code size increases to 8KB. Thus set the code mapping size to its real size, i.e. PAGE_ALIGN(vdso_end - vdso_start). Fixes: 18efd0b10e0fd77 ("LoongArch: vDSO: Wire up getrandom() vDSO implementation") Reviewed-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-10-21T14:11:19Z Huacai Chen chenhuacai@loongson.cn 2024-10-21T14:11:19Z urn:sha1:69cc6fad5df4ce652d969be69acc60e269e5eea1 Unaligned access exception can be triggered in irq-enabled context such as user mode, in this case do_ale() may call get_user() which may cause sleep. Then we will get: BUG: sleeping function called from invalid context at arch/loongarch/kernel/access-helper.h:7 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 129, name: modprobe preempt_count: 0, expected: 0 RCU nest depth: 0, expected: 0 CPU: 0 UID: 0 PID: 129 Comm: modprobe Tainted: G W 6.12.0-rc1+ #1723 Tainted: [W]=WARN Stack : 9000000105e0bd48 0000000000000000 9000000003803944 9000000105e08000 9000000105e0bc70 9000000105e0bc78 0000000000000000 0000000000000000 9000000105e0bc78 0000000000000001 9000000185e0ba07 9000000105e0b890 ffffffffffffffff 9000000105e0bc78 73924b81763be05b 9000000100194500 000000000000020c 000000000000000a 0000000000000000 0000000000000003 00000000000023f0 00000000000e1401 00000000072f8000 0000007ffbb0e260 0000000000000000 0000000000000000 9000000005437650 90000000055d5000 0000000000000000 0000000000000003 0000007ffbb0e1f0 0000000000000000 0000005567b00490 0000000000000000 9000000003803964 0000007ffbb0dfec 00000000000000b0 0000000000000007 0000000000000003 0000000000071c1d ... Call Trace: [<9000000003803964>] show_stack+0x64/0x1a0 [<9000000004c57464>] dump_stack_lvl+0x74/0xb0 [<9000000003861ab4>] __might_resched+0x154/0x1a0 [<900000000380c96c>] emulate_load_store_insn+0x6c/0xf60 [<9000000004c58118>] do_ale+0x78/0x180 [<9000000003801bc8>] handle_ale+0x128/0x1e0 So enable IRQ if unaligned access exception is triggered in irq-enabled context to fix it. Cc: stable@vger.kernel.org Reported-by: Binbin Zhou <zhoubinbin@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-10-21T14:11:18Z Huacai Chen chenhuacai@loongson.cn 2024-10-21T14:11:18Z urn:sha1:b7296f9d5bf99330063d4bbecc43c9b33fed0137 In loongson_sysconf, The "core" of cores_per_node and cores_per_package stands for a logical core, which means in a SMT system it stands for a thread indeed. This information is gotten from SMBIOS Type4 Structure, so in order to get a correct cores_per_package for both SMT and non-SMT systems in parse_cpu_table() we should use SMBIOS_THREAD_PACKAGE_OFFSET instead of SMBIOS_CORE_PACKAGE_OFFSET. Cc: stable@vger.kernel.org Reported-by: Chao Li <lichao@loongson.cn> Tested-by: Chao Li <lichao@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-09-27T17:14:35Z Linus Torvalds torvalds@linux-foundation.org 2024-09-27T17:14:35Z urn:sha1:3630400697a3d334a391c1dba1b601d852145f2c Pull LoongArch updates from Huacai Chen: - Fix objtool about do_syscall() and Clang - Enable generic CPU vulnerabilites support - Enable ACPI BGRT handling - Rework CPU feature probe from CPUCFG/IOCSR - Add ARCH_HAS_SET_MEMORY support - Add ARCH_HAS_SET_DIRECT_MAP support - Improve hardware page table walker - Simplify _percpu_read() and _percpu_write() - Add advanced extended IRQ model documentions - Some bug fixes and other small changes * tag 'loongarch-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson: Docs/LoongArch: Add advanced extended IRQ model description LoongArch: Remove posix_types.h include from sigcontext.h LoongArch: Fix memleak in pci_acpi_scan_root() LoongArch: Simplify _percpu_read() and _percpu_write() LoongArch: Improve hardware page table walker LoongArch: Add ARCH_HAS_SET_DIRECT_MAP support LoongArch: Add ARCH_HAS_SET_MEMORY support LoongArch: Rework CPU feature probe from CPUCFG/IOCSR LoongArch: Enable ACPI BGRT handling LoongArch: Enable generic CPU vulnerabilites support LoongArch: Remove STACK_FRAME_NON_STANDARD(do_syscall) LoongArch: Set AS_HAS_THIN_ADD_SUB as y if AS_IS_LLVM LoongArch: Enable objtool for Clang objtool: Handle frame pointer related instructions 2024-09-24T07:32:20Z Jiaxun Yang jiaxun.yang@flygoat.com 2024-09-24T07:32:20Z urn:sha1:34e3c4500cdc06094b37a41b622598098308ba8f Probe ISA level, TLB, IOCSR information from CPUCFG to improve kernel resilience to different core implementations. BTW, IOCSR register definition appears to be a platform-specific spec instead of an architecture spec, even for the Loongson CPUs there is no guarantee that IOCSR will always present. Thus it's dangerous to perform IOCSR probing without checking CPU type and instruction availability. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-09-24T07:32:06Z Bibo Mao maobibo@loongson.cn 2024-09-24T07:32:06Z urn:sha1:d0bb0b600081bc7c246b97b2901abbb6c357ff7b Add ACPI BGRT support on LoongArch so it can display image provied by acpi table at boot stage and switch to graphical UI smoothly. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>