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Linux kernel source tree
b3431a8bb3
flush_tlb_kernel_range() may use IPIs to flush the TLBs of all the
cores, which triggers the following warning when the irqs are disabled:
[ 3.455330] WARNING: CPU: 1 PID: 0 at kernel/smp.c:815 smp_call_function_many_cond+0x452/0x520
[ 3.456647] Modules linked in:
[ 3.457218] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.12.0-rc7-00010-g91d3de7240b8 #1
[ 3.457416] Hardware name: QEMU QEMU Virtual Machine, BIOS
[ 3.457633] epc : smp_call_function_many_cond+0x452/0x520
[ 3.457736] ra : on_each_cpu_cond_mask+0x1e/0x30
[ 3.457786] epc : ffffffff800b669a ra : ffffffff800b67c2 sp : ff2000000000bb50
[ 3.457824] gp : ffffffff815212b8 tp : ff6000008014f080 t0 : 000000000000003f
[ 3.457859] t1 : ffffffff815221e0 t2 : 000000000000000f s0 : ff2000000000bc10
[ 3.457920] s1 : 0000000000000040 a0 : ffffffff815221e0 a1 : 0000000000000001
[ 3.457953] a2 : 0000000000010000 a3 : 0000000000000003 a4 : 0000000000000000
[ 3.458006] a5 : 0000000000000000 a6 : ffffffffffffffff a7 : 0000000000000000
[ 3.458042] s2 : ffffffff815223be s3 : 00fffffffffff000 s4 : ff600001ffe38fc0
[ 3.458076] s5 : ff600001ff950d00 s6 : 0000000200000120 s7 : 0000000000000001
[ 3.458109] s8 : 0000000000000001 s9 : ff60000080841ef0 s10: 0000000000000001
[ 3.458141] s11: ffffffff81524812 t3 : 0000000000000001 t4 : ff60000080092bc0
[ 3.458172] t5 : 0000000000000000 t6 : ff200000000236d0
[ 3.458203] status: 0000000200000100 badaddr: ffffffff800b669a cause: 0000000000000003
[ 3.458373] [<ffffffff800b669a>] smp_call_function_many_cond+0x452/0x520
[ 3.458593] [<ffffffff800b67c2>] on_each_cpu_cond_mask+0x1e/0x30
[ 3.458625] [<ffffffff8000e4ca>] __flush_tlb_range+0x118/0x1ca
[ 3.458656] [<ffffffff8000e6b2>] flush_tlb_kernel_range+0x1e/0x26
[ 3.458683] [<ffffffff801ea56a>] kfence_protect+0xc0/0xce
[ 3.458717] [<ffffffff801e9456>] kfence_guarded_free+0xc6/0x1c0
[ 3.458742] [<ffffffff801e9d6c>] __kfence_free+0x62/0xc6
[ 3.458764] [<ffffffff801c57d8>] kfree+0x106/0x32c
[ 3.458786] [<ffffffff80588cf2>] detach_buf_split+0x188/0x1a8
[ 3.458816] [<ffffffff8058708c>] virtqueue_get_buf_ctx+0xb6/0x1f6
[ 3.458839] [<ffffffff805871da>] virtqueue_get_buf+0xe/0x16
[ 3.458880] [<ffffffff80613d6a>] virtblk_done+0x5c/0xe2
[ 3.458908] [<ffffffff8058766e>] vring_interrupt+0x6a/0x74
[ 3.458930] [<ffffffff800747d8>] __handle_irq_event_percpu+0x7c/0xe2
[ 3.458956] [<ffffffff800748f0>] handle_irq_event+0x3c/0x86
[ 3.458978] [<ffffffff800786cc>] handle_simple_irq+0x9e/0xbe
[ 3.459004] [<ffffffff80073934>] generic_handle_domain_irq+0x1c/0x2a
[ 3.459027] [<ffffffff804bf87c>] imsic_handle_irq+0xba/0x120
[ 3.459056] [<ffffffff80073934>] generic_handle_domain_irq+0x1c/0x2a
[ 3.459080] [<ffffffff804bdb76>] riscv_intc_aia_irq+0x24/0x34
[ 3.459103] [<ffffffff809d0452>] handle_riscv_irq+0x2e/0x4c
[ 3.459133] [<ffffffff809d923e>] call_on_irq_stack+0x32/0x40
So only flush the local TLB and let the lazy kfence page fault handling
deal with the faults which could happen when a core has an old protected
pte version cached in its TLB. That leads to potential inaccuracies which
can be tolerated when using kfence.
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.