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2021-04-22powerpc/64: Fix the definition of the fixmap areaChristophe Leroy1-1/+3
At the time being, the fixmap area is defined at the top of the address space or just below KASAN. This definition is not valid for PPC64. For PPC64, use the top of the I/O space. Because of circular dependencies, it is not possible to include asm/fixmap.h in asm/book3s/64/pgtable.h , so define a fixed size AREA at the top of the I/O space for fixmap and ensure during build that the size is big enough. Fixes: 265c3491c4bc ("powerpc: Add support for GENERIC_EARLY_IOREMAP") Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/0d51620eacf036d683d1a3c41328f69adb601dc0.1618925560.git.christophe.leroy@csgroup.eu
2021-04-14powerpc/32s: Define a MODULE area below kernel text all the timeChristophe Leroy1-2/+0
On book3s/32, the segment below kernel text is used for module allocation when CONFIG_STRICT_KERNEL_RWX is defined. In order to benefit from the powerpc specific module_alloc() function which allocate modules with 32 Mbytes from end of kernel text, use that segment below PAGE_OFFSET at all time. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/a46dcdd39a9e80b012d86c294c4e5cd8d31665f3.1617283827.git.christophe.leroy@csgroup.eu
2021-04-08powerpc/mm/64s: Add _PAGE_KERNEL_ROXMichael Ellerman1-0/+1
In the past we had a fallback definition for _PAGE_KERNEL_ROX, but we removed that in commit d82fd29c5a8c ("powerpc/mm: Distribute platform specific PAGE and PMD flags and definitions") and added definitions for each MMU family. However we missed adding a definition for 64s, which was not really a bug because it's currently not used. But we'd like to use PAGE_KERNEL_ROX in a future patch so add a definition now. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210331003845.216246-1-mpe@ellerman.id.au
2021-04-08powerpc/64s: Fix pte update for kernel memory on radixJordan Niethe1-2/+4
When adding a PTE a ptesync is needed to order the update of the PTE with subsequent accesses otherwise a spurious fault may be raised. radix__set_pte_at() does not do this for performance gains. For non-kernel memory this is not an issue as any faults of this kind are corrected by the page fault handler. For kernel memory these faults are not handled. The current solution is that there is a ptesync in flush_cache_vmap() which should be called when mapping from the vmalloc region. However, map_kernel_page() does not call flush_cache_vmap(). This is troublesome in particular for code patching with Strict RWX on radix. In do_patch_instruction() the page frame that contains the instruction to be patched is mapped and then immediately patched. With no ordering or synchronization between setting up the PTE and writing to the page it is possible for faults. As the code patching is done using __put_user_asm_goto() the resulting fault is obscured - but using a normal store instead it can be seen: BUG: Unable to handle kernel data access on write at 0xc008000008f24a3c Faulting instruction address: 0xc00000000008bd74 Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: nop_module(PO+) [last unloaded: nop_module] CPU: 4 PID: 757 Comm: sh Tainted: P O 5.10.0-rc5-01361-ge3c1b78c8440-dirty #43 NIP: c00000000008bd74 LR: c00000000008bd50 CTR: c000000000025810 REGS: c000000016f634a0 TRAP: 0300 Tainted: P O (5.10.0-rc5-01361-ge3c1b78c8440-dirty) MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 44002884 XER: 00000000 CFAR: c00000000007c68c DAR: c008000008f24a3c DSISR: 42000000 IRQMASK: 1 This results in the kind of issue reported here: https://lore.kernel.org/linuxppc-dev/15AC5B0E-A221-4B8C-9039-FA96B8EF7C88@lca.pw/ Chris Riedl suggested a reliable way to reproduce the issue: $ mount -t debugfs none /sys/kernel/debug $ (while true; do echo function > /sys/kernel/debug/tracing/current_tracer ; echo nop > /sys/kernel/debug/tracing/current_tracer ; done) & Turning ftrace on and off does a large amount of code patching which in usually less then 5min will crash giving a trace like: ftrace-powerpc: (____ptrval____): replaced (4b473b11) != old (60000000) ------------[ ftrace bug ]------------ ftrace failed to modify [<c000000000bf8e5c>] napi_busy_loop+0xc/0x390 actual: 11:3b:47:4b Setting ftrace call site to call ftrace function ftrace record flags: 80000001 (1) expected tramp: c00000000006c96c ------------[ cut here ]------------ WARNING: CPU: 4 PID: 809 at kernel/trace/ftrace.c:2065 ftrace_bug+0x28c/0x2e8 Modules linked in: nop_module(PO-) [last unloaded: nop_module] CPU: 4 PID: 809 Comm: sh Tainted: P O 5.10.0-rc5-01360-gf878ccaf250a #1 NIP: c00000000024f334 LR: c00000000024f330 CTR: c0000000001a5af0 REGS: c000000004c8b760 TRAP: 0700 Tainted: P O (5.10.0-rc5-01360-gf878ccaf250a) MSR: 900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 28008848 XER: 20040000 CFAR: c0000000001a9c98 IRQMASK: 0 GPR00: c00000000024f330 c000000004c8b9f0 c000000002770600 0000000000000022 GPR04: 00000000ffff7fff c000000004c8b6d0 0000000000000027 c0000007fe9bcdd8 GPR08: 0000000000000023 ffffffffffffffd8 0000000000000027 c000000002613118 GPR12: 0000000000008000 c0000007fffdca00 0000000000000000 0000000000000000 GPR16: 0000000023ec37c5 0000000000000000 0000000000000000 0000000000000008 GPR20: c000000004c8bc90 c0000000027a2d20 c000000004c8bcd0 c000000002612fe8 GPR24: 0000000000000038 0000000000000030 0000000000000028 0000000000000020 GPR28: c000000000ff1b68 c000000000bf8e5c c00000000312f700 c000000000fbb9b0 NIP ftrace_bug+0x28c/0x2e8 LR ftrace_bug+0x288/0x2e8 Call Trace: ftrace_bug+0x288/0x2e8 (unreliable) ftrace_modify_all_code+0x168/0x210 arch_ftrace_update_code+0x18/0x30 ftrace_run_update_code+0x44/0xc0 ftrace_startup+0xf8/0x1c0 register_ftrace_function+0x4c/0xc0 function_trace_init+0x80/0xb0 tracing_set_tracer+0x2a4/0x4f0 tracing_set_trace_write+0xd4/0x130 vfs_write+0xf0/0x330 ksys_write+0x84/0x140 system_call_exception+0x14c/0x230 system_call_common+0xf0/0x27c To fix this when updating kernel memory PTEs using ptesync. Fixes: f1cb8f9beba8 ("powerpc/64s/radix: avoid ptesync after set_pte and ptep_set_access_flags") Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Tidy up change log slightly] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210208032957.1232102-1-jniethe5@gmail.com
2021-03-29powerpc/32: Manage KUAP in CChristophe Leroy1-49/+1
Move all KUAP management in C. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/199365ddb58d579daf724815f2d0acb91cc49d19.1615552867.git.christophe.leroy@csgroup.eu
2021-03-29powerpc/32s: Create C version of kuap save/restore/check helpersChristophe Leroy1-0/+45
In preparation of porting PPC32 to C syscall entry/exit, create C version of kuap_save_and_lock() and kuap_user_restore() and kuap_kernel_restore() and kuap_assert_locked() and kuap_get_and_assert_locked() on book3s/32. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/2be8fb729da4a0f9863b25e1b9d547174fcd5056.1615552867.git.christophe.leroy@csgroup.eu
2021-03-29powerpc/64s: Make kuap_check_amr() and kuap_get_and_check_amr() genericChristophe Leroy1-22/+2
In preparation of porting powerpc32 to C syscall entry/exit, rename kuap_check_amr() and kuap_get_and_check_amr() as kuap_assert_locked() and kuap_get_and_assert_locked(), and move in the generic asm/kup.h the stub for when CONFIG_PPC_KUAP is not selected. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f82614d9b17b83abd739aa18fc08811815d0c2e3.1615552867.git.christophe.leroy@csgroup.eu
2021-03-29powerpc/32s: Move KUEP locking/unlocking in CChristophe Leroy1-31/+0
This can be done in C, do it. Unrolling the loop gains approx. 15% performance. From now on, prepare_transfer_to_handler() is only for interrupts from kernel. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4eadd873927e9a73c3d1dfe2f9497353465514cf.1615552867.git.christophe.leroy@csgroup.eu
2021-03-24powerpc: Fix misspellings in tlbflush.hZhang Yunkai1-1/+1
The comment marking the end of the include guard is wrong, fix it up. Signed-off-by: Zhang Yunkai <zhang.yunkai@zte.com.cn> [mpe: Rewrite commit message] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210304031318.188447-1-zhang.yunkai@zte.com.cn
2021-03-24powerpc: Remove duplicate includesZhang Yunkai1-1/+0
asm/tm.h included in traps.c is duplicated. It is also included on the 62nd line. asm/udbg.h included in setup-common.c is duplicated. It is also included on the 61st line. asm/bug.h included in arch/powerpc/include/asm/book3s/64/mmu-hash.h is duplicated. It is also included on the 12th line. asm/tlbflush.h included in arch/powerpc/include/asm/pgtable.h is duplicated. It is also included on the 11th line. asm/page.h included in arch/powerpc/include/asm/thread_info.h is duplicated. It is also included on the 13th line. Signed-off-by: Zhang Yunkai <zhang.yunkai@zte.com.cn> [mpe: Squash together from multiple commits] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2021-02-23Merge tag 'powerpc-5.12-1' of ↵Linus Torvalds8-13/+35
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - A large series adding wrappers for our interrupt handlers, so that irq/nmi/user tracking can be isolated in the wrappers rather than spread in each handler. - Conversion of the 32-bit syscall handling into C. - A series from Nick to streamline our TLB flushing when using the Radix MMU. - Switch to using queued spinlocks by default for 64-bit server CPUs. - A rework of our PCI probing so that it happens later in boot, when more generic infrastructure is available. - Two small fixes to allow 32-bit little-endian processes to run on 64-bit kernels. - Other smaller features, fixes & cleanups. Thanks to: Alexey Kardashevskiy, Ananth N Mavinakayanahalli, Aneesh Kumar K.V, Athira Rajeev, Bhaskar Chowdhury, Cédric Le Goater, Chengyang Fan, Christophe Leroy, Christopher M. Riedl, Fabiano Rosas, Florian Fainelli, Frederic Barrat, Ganesh Goudar, Hari Bathini, Jiapeng Chong, Joseph J Allen, Kajol Jain, Markus Elfring, Michal Suchanek, Nathan Lynch, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran, Pingfan Liu, Po-Hsu Lin, Qian Cai, Ram Pai, Randy Dunlap, Sandipan Das, Stephen Rothwell, Tyrel Datwyler, Will Springer, Yury Norov, and Zheng Yongjun. * tag 'powerpc-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (188 commits) powerpc/perf: Adds support for programming of Thresholding in P10 powerpc/pci: Remove unimplemented prototypes powerpc/uaccess: Merge raw_copy_to_user_allowed() into raw_copy_to_user() powerpc/uaccess: Merge __put_user_size_allowed() into __put_user_size() powerpc/uaccess: get rid of small constant size cases in raw_copy_{to,from}_user() powerpc/64: Fix stack trace not displaying final frame powerpc/time: Remove get_tbl() powerpc/time: Avoid using get_tbl() spi: mpc52xx: Avoid using get_tbl() powerpc/syscall: Avoid storing 'current' in another pointer powerpc/32: Handle bookE debugging in C in syscall entry/exit powerpc/syscall: Do not check unsupported scv vector on PPC32 powerpc/32: Remove the counter in global_dbcr0 powerpc/32: Remove verification of MSR_PR on syscall in the ASM entry powerpc/syscall: implement system call entry/exit logic in C for PPC32 powerpc/32: Always save non volatile GPRs at syscall entry powerpc/syscall: Change condition to check MSR_RI powerpc/syscall: Save r3 in regs->orig_r3 powerpc/syscall: Use is_compat_task() powerpc/syscall: Make interrupt.c buildable on PPC32 ...
2021-02-08powerpc/32s: mfsrin()/mtsrin() become mfsr()/mtsr()Christophe Leroy1-4/+4
Function names should tell what the function does, not how. mfsrin() and mtsrin() are read/writing segment registers. They are called that way because they are using mfsrin and mtsrin instructions, but it doesn't matter for the caller. In preparation of following patch, change their name to mfsr() and mtsr() in order to make it obvious they manipulate segment registers without messing up with how they do it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f92d99f4349391b77766745900231aa880a0efb5.1612612022.git.christophe.leroy@csgroup.eu
2021-02-08powerpc/64s: Implement ptep_clear_flush_young that does not flush TLBsNicholas Piggin1-3/+20
Similarly to the x86 commit b13b1d2d8692 ("x86/mm: In the PTE swapout page reclaim case clear the accessed bit instead of flushing the TLB"), implement ptep_clear_flush_young that does not actually flush the TLB in the case the referenced bit is cleared. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201217134731.488135-8-npiggin@gmail.com
2021-02-08powerpc: remove unneeded semicolonsChengyang Fan4-4/+4
Remove superfluous semicolons after function definitions. Signed-off-by: Chengyang Fan <cy.fan@huawei.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210125095338.1719405-1-cy.fan@huawei.com
2021-02-08powerpc: convert interrupt handlers to use wrappersNicholas Piggin1-1/+0
Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210130130852.2952424-29-npiggin@gmail.com
2021-02-08powerpc: remove arguments from fault handler functionsNicholas Piggin1-1/+1
Make mm fault handlers all just take the pt_regs * argument and load DAR/DSISR from that. Make those that return a value return long. This is done to make the function signatures match other handlers, which will help with a future patch to add wrappers. Explicit arguments could be added for performance but that would require more wrapper macro variants. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210130130852.2952424-7-npiggin@gmail.com
2021-02-08powerpc/64s: move the hash fault handling logic to CNicholas Piggin1-0/+1
The fault handling still has some complex logic particularly around hash table handling, in asm. Implement most of this in C. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210130130852.2952424-6-npiggin@gmail.com
2021-02-06powerpc/kuap: Allow kernel thread to access userspace after kthread_use_mmAneesh Kumar K.V2-9/+11
This fix the bad fault reported by KUAP when io_wqe_worker access userspace. Bug: Read fault blocked by KUAP! WARNING: CPU: 1 PID: 101841 at arch/powerpc/mm/fault.c:229 __do_page_fault+0x6b4/0xcd0 NIP [c00000000009e7e4] __do_page_fault+0x6b4/0xcd0 LR [c00000000009e7e0] __do_page_fault+0x6b0/0xcd0 .......... Call Trace: [c000000016367330] [c00000000009e7e0] __do_page_fault+0x6b0/0xcd0 (unreliable) [c0000000163673e0] [c00000000009ee3c] do_page_fault+0x3c/0x120 [c000000016367430] [c00000000000c848] handle_page_fault+0x10/0x2c --- interrupt: 300 at iov_iter_fault_in_readable+0x148/0x6f0 .......... NIP [c0000000008e8228] iov_iter_fault_in_readable+0x148/0x6f0 LR [c0000000008e834c] iov_iter_fault_in_readable+0x26c/0x6f0 interrupt: 300 [c0000000163677e0] [c0000000007154a0] iomap_write_actor+0xc0/0x280 [c000000016367880] [c00000000070fc94] iomap_apply+0x1c4/0x780 [c000000016367990] [c000000000710330] iomap_file_buffered_write+0xa0/0x120 [c0000000163679e0] [c00800000040791c] xfs_file_buffered_aio_write+0x314/0x5e0 [xfs] [c000000016367a90] [c0000000006d74bc] io_write+0x10c/0x460 [c000000016367bb0] [c0000000006d80e4] io_issue_sqe+0x8d4/0x1200 [c000000016367c70] [c0000000006d8ad0] io_wq_submit_work+0xc0/0x250 [c000000016367cb0] [c0000000006e2578] io_worker_handle_work+0x498/0x800 [c000000016367d40] [c0000000006e2cdc] io_wqe_worker+0x3fc/0x4f0 [c000000016367da0] [c0000000001cb0a4] kthread+0x1c4/0x1d0 [c000000016367e10] [c00000000000dbf0] ret_from_kernel_thread+0x5c/0x6c The kernel consider thread AMR value for kernel thread to be AMR_KUAP_BLOCKED. Hence access to userspace is denied. This of course not correct and we should allow userspace access after kthread_use_mm(). To be precise, kthread_use_mm() should inherit the AMR value of the operating address space. But, the AMR value is thread-specific and we inherit the address space and not thread access restrictions. Because of this ignore AMR value when accessing userspace via kernel thread. current_thread_amr/iamr() are updated, because we use them in the below stack. .... [ 530.710838] CPU: 13 PID: 5587 Comm: io_wqe_worker-0 Tainted: G D 5.11.0-rc6+ #3 .... NIP [c0000000000aa0c8] pkey_access_permitted+0x28/0x90 LR [c0000000004b9278] gup_pte_range+0x188/0x420 --- interrupt: 700 [c00000001c4ef3f0] [0000000000000000] 0x0 (unreliable) [c00000001c4ef490] [c0000000004bd39c] gup_pgd_range+0x3ac/0xa20 [c00000001c4ef5a0] [c0000000004bdd44] internal_get_user_pages_fast+0x334/0x410 [c00000001c4ef620] [c000000000852028] iov_iter_get_pages+0xf8/0x5c0 [c00000001c4ef6a0] [c0000000007da44c] bio_iov_iter_get_pages+0xec/0x700 [c00000001c4ef770] [c0000000006a325c] iomap_dio_bio_actor+0x2ac/0x4f0 [c00000001c4ef810] [c00000000069cd94] iomap_apply+0x2b4/0x740 [c00000001c4ef920] [c0000000006a38b8] __iomap_dio_rw+0x238/0x5c0 [c00000001c4ef9d0] [c0000000006a3c60] iomap_dio_rw+0x20/0x80 [c00000001c4ef9f0] [c008000001927a30] xfs_file_dio_aio_write+0x1f8/0x650 [xfs] [c00000001c4efa60] [c0080000019284dc] xfs_file_write_iter+0xc4/0x130 [xfs] [c00000001c4efa90] [c000000000669984] io_write+0x104/0x4b0 [c00000001c4efbb0] [c00000000066cea4] io_issue_sqe+0x3d4/0xf50 [c00000001c4efc60] [c000000000670200] io_wq_submit_work+0xb0/0x2f0 [c00000001c4efcb0] [c000000000674268] io_worker_handle_work+0x248/0x4a0 [c00000001c4efd30] [c0000000006746e8] io_wqe_worker+0x228/0x2a0 [c00000001c4efda0] [c00000000019d994] kthread+0x1b4/0x1c0 Fixes: 48a8ab4eeb82 ("powerpc/book3s64/pkeys: Don't update SPRN_AMR when in kernel mode.") Reported-by: Zorro Lang <zlang@redhat.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210206025634.521979-1-aneesh.kumar@linux.ibm.com
2021-01-30powerpc/mm: Declare preload_new_slb_context() prototypeCédric Le Goater1-0/+1
It fixes this W=1 compile error : ../arch/powerpc/mm/book3s64/slb.c:380:6: error: no previous prototype for ‘preload_new_slb_context’ [-Werror=missing-prototypes] 380 | void preload_new_slb_context(unsigned long start, unsigned long sp) | ^~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210104143206.695198-15-clg@kaod.org
2021-01-30powerpc/mm: Move hpte_insert_repeating() prototypeCédric Le Goater1-0/+2
It fixes this W=1 compile error : ../arch/powerpc/mm/book3s64/hash_utils.c:1867:6: error: no previous prototype for ‘hpte_insert_repeating’ [-Werror=missing-prototypes] 1867 | long hpte_insert_repeating(unsigned long hash, unsigned long vpn, | ^~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210104143206.695198-14-clg@kaod.org
2021-01-30powerpc/mm: Declare some prototypesCédric Le Goater1-0/+2
It fixes this W=1 compile error : ../arch/powerpc/mm/book3s64/hash_utils.c:1515:5: error: no previous prototype for ‘__hash_page’ [-Werror=missing-prototypes] 1515 | int __hash_page(unsigned long trap, unsigned long ea, unsigned long dsisr, | ^~~~~~~~~~~ ../arch/powerpc/mm/book3s64/hash_utils.c:1850:6: error: no previous prototype for ‘low_hash_fault’ [-Werror=missing-prototypes] 1850 | void low_hash_fault(struct pt_regs *regs, unsigned long address, int rc) | ^~~~~~~~~~~~~~ Signed-off-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210104143206.695198-13-clg@kaod.org
2021-01-30powerpc/64s/kuap: Use mmu_has_feature()Michael Ellerman1-2/+2
In commit 8150a153c013 ("powerpc/64s: Use early_mmu_has_feature() in set_kuap()") we switched the KUAP code to use early_mmu_has_feature(), to avoid a bug where we called set_kuap() before feature patching had been done, leading to recursion and crashes. That path, which called probe_kernel_read() from printk(), has since been removed, see commit 2ac5a3bf7042 ("vsprintf: Do not break early boot with probing addresses"). Additionally probe_kernel_read() no longer invokes any KUAP routines, since commit fe557319aa06 ("maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault") and c33165253492 ("powerpc: use non-set_fs based maccess routines"). So it should now be safe to use mmu_has_feature() in the KUAP routines, because we shouldn't invoke them prior to feature patching. This is essentially a revert of commit 8150a153c013 ("powerpc/64s: Use early_mmu_has_feature() in set_kuap()"), but we've since added a second usage of early_mmu_has_feature() in get_kuap(), so we convert that to use mmu_has_feature() as well. Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Depends-on: c33165253492 ("powerpc: use non-set_fs based maccess routines"). Link: https://lore.kernel.org/r/20201217005306.895685-1-mpe@ellerman.id.au
2020-12-18Merge tag 'powerpc-5.11-1' of ↵Linus Torvalds13-236/+594
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - Switch to the generic C VDSO, as well as some cleanups of our VDSO setup/handling code. - Support for KUAP (Kernel User Access Prevention) on systems using the hashed page table MMU, using memory protection keys. - Better handling of PowerVM SMT8 systems where all threads of a core do not share an L2, allowing the scheduler to make better scheduling decisions. - Further improvements to our machine check handling. - Show registers when unwinding interrupt frames during stack traces. - Improvements to our pseries (PowerVM) partition migration code. - Several series from Christophe refactoring and cleaning up various parts of the 32-bit code. - Other smaller features, fixes & cleanups. Thanks to: Alan Modra, Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V, Ard Biesheuvel, Athira Rajeev, Balamuruhan S, Bill Wendling, Cédric Le Goater, Christophe Leroy, Christophe Lombard, Colin Ian King, Daniel Axtens, David Hildenbrand, Frederic Barrat, Ganesh Goudar, Gautham R. Shenoy, Geert Uytterhoeven, Giuseppe Sacco, Greg Kurz, Harish, Jan Kratochvil, Jordan Niethe, Kaixu Xia, Laurent Dufour, Leonardo Bras, Madhavan Srinivasan, Mahesh Salgaonkar, Mathieu Desnoyers, Nathan Lynch, Nicholas Piggin, Oleg Nesterov, Oliver O'Halloran, Oscar Salvador, Po-Hsu Lin, Qian Cai, Qinglang Miao, Randy Dunlap, Ravi Bangoria, Sachin Sant, Sandipan Das, Sebastian Andrzej Siewior , Segher Boessenkool, Srikar Dronamraju, Tyrel Datwyler, Uwe Kleine-König, Vincent Stehlé, Youling Tang, and Zhang Xiaoxu. * tag 'powerpc-5.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (304 commits) powerpc/32s: Fix cleanup_cpu_mmu_context() compile bug powerpc: Add config fragment for disabling -Werror powerpc/configs: Add ppc64le_allnoconfig target powerpc/powernv: Rate limit opal-elog read failure message powerpc/pseries/memhotplug: Quieten some DLPAR operations powerpc/ps3: use dma_mapping_error() powerpc: force inlining of csum_partial() to avoid multiple csum_partial() with GCC10 powerpc/perf: Fix Threshold Event Counter Multiplier width for P10 powerpc/mm: Fix hugetlb_free_pmd_range() and hugetlb_free_pud_range() KVM: PPC: Book3S HV: Fix mask size for emulated msgsndp KVM: PPC: fix comparison to bool warning KVM: PPC: Book3S: Assign boolean values to a bool variable powerpc: Inline setup_kup() powerpc/64s: Mark the kuap/kuep functions non __init KVM: PPC: Book3S HV: XIVE: Add a comment regarding VP numbering powerpc/xive: Improve error reporting of OPAL calls powerpc/xive: Simplify xive_do_source_eoi() powerpc/xive: Remove P9 DD1 flag XIVE_IRQ_FLAG_EOI_FW powerpc/xive: Remove P9 DD1 flag XIVE_IRQ_FLAG_MASK_FW powerpc/xive: Remove P9 DD1 flag XIVE_IRQ_FLAG_SHIFT_BUG ...
2020-12-17powerpc/32s: Fix cleanup_cpu_mmu_context() compile bugMichael Ellerman1-0/+1
Currently pmac32_defconfig with SMP=y doesn't build: arch/powerpc/platforms/powermac/smp.c: error: implicit declaration of function 'cleanup_cpu_mmu_context' It would be nice for consistency if all platforms clear mm_cpumask and flush TLBs on unplug, but the TLB invalidation bug described in commit 01b0f0eae081 ("powerpc/64s: Trim offlined CPUs from mm_cpumasks") only applies to 64s and for now we only have the TLB flush code for that platform. So just add an empty version for 32-bit Book3S. Fixes: 01b0f0eae081 ("powerpc/64s: Trim offlined CPUs from mm_cpumasks") Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Change log based on comments from Nick] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2020-12-09powerpc/mm: Move the WARN() out of bad_kuap_fault()Christophe Leroy2-9/+3
In order to prepare the removal of calls to search_exception_tables() on the fast path, move the WARN() out of bad_kuap_fault(). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/9501311014bd6507e04b27a0c3035186ccf65cd5.1607491748.git.christophe.leroy@csgroup.eu
2020-12-09powerpc/32s: Inline flush_hash_entry()Christophe Leroy1-6/+11
flush_hash_entry() is a simple function calling flush_hash_pages() if it's a hash MMU or doing nothing otherwise. Inline it. And use it also in __ptep_test_and_clear_young(). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/9af895be7d4b404d40e749a2659552fd138e62c4.1603348103.git.christophe.leroy@csgroup.eu
2020-12-09powerpc/32s: Inline tlb_flush()Christophe Leroy1-0/+11
On book3s/32, tlb_flush() does nothing when the CPU has a hash table, it calls _tlbia() otherwise. Inline it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ebc933d1c530a19ef3cf7983f6ae94814f6e92ac.1603348103.git.christophe.leroy@csgroup.eu
2020-12-09powerpc/32s: Split and inline flush_range()Christophe Leroy1-1/+12
flush_range() handle both the MMU_FTR_HPTE_TABLE case and the other case. The non MMU_FTR_HPTE_TABLE case is trivial as it is only a call to _tlbie()/_tlbia() which is not worth a dedicated function. Make flush_range() a hash specific and call it from tlbflush.h based on mmu_has_feature(MMU_FTR_HPTE_TABLE). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/132ab19aae52abc8e06ab524ec86d4229b5b9c3d.1603348103.git.christophe.leroy@csgroup.eu
2020-12-09powerpc/32s: Inline flush_tlb_range() and flush_tlb_kernel_range()Christophe Leroy1-3/+12
flush_tlb_range() and flush_tlb_kernel_range() are trivial calls to flush_range(). Make flush_range() global and inline flush_tlb_range() and flush_tlb_kernel_range(). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c7029a78e78709ad9272d7a44260e06b649169b2.1603348103.git.christophe.leroy@csgroup.eu
2020-12-09powerpc/32s: Split and inline flush_tlb_mm() and flush_tlb_page()Christophe Leroy1-2/+18
flush_tlb_mm() and flush_tlb_page() handle both the MMU_FTR_HPTE_TABLE case and the other case. The non MMU_FTR_HPTE_TABLE case is trivial as it is only a call to _tlbie()/_tlbia() which is not worth a dedicated function. Make flush_tlb_mm() and flush_tlb_page() hash specific and call them from tlbflush.h based on mmu_has_feature(MMU_FTR_HPTE_TABLE). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/11e932ded41ba6d9b251d89b7afa33cc060d3aa4.1603348103.git.christophe.leroy@csgroup.eu
2020-12-09powerpc/32s: Inline _tlbie() on non SMPChristophe Leroy1-0/+7
On non SMP, _tlbie() is just a tlbie plus a sync instruction. Make it static inline. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/475136425541db5c7c8a0395d19d400525b251bc.1603348103.git.christophe.leroy@csgroup.eu
2020-12-09powerpc/32s: Move _tlbie() and _tlbia() prototypes to tlbflush.hChristophe Leroy1-0/+4
In order to use _tlbie() and _tlbia() directly from asm/book3s/32/tlbflush.h, move their prototypes from mm/mm_decl.h to there. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/867587af929973ad65f8ef6972f2474a80c1737a.1603348103.git.christophe.leroy@csgroup.eu
2020-12-09powerpc/mm: Remove flush_tlb_page_nohash() prototype.Christophe Leroy1-1/+0
flush_tlb_page_nohash() was removed by commit 703b41ad1a87 ("powerpc/mm: remove flush_tlb_page_nohash") Remove stale prototype and comment. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4a58831da6d6ba4fe309b94aa1dd8f02982d46b2.1603348103.git.christophe.leroy@csgroup.eu
2020-12-08powerpc/book3s64/kuap: Improve error reporting with KUAPAneesh Kumar K.V2-19/+19
This partially reverts commit eb232b162446 ("powerpc/book3s64/kuap: Improve error reporting with KUAP") and update the fault handler to print [ 55.022514] Kernel attempted to access user page (7e6725b70000) - exploit attempt? (uid: 0) [ 55.022528] BUG: Unable to handle kernel data access on read at 0x7e6725b70000 [ 55.022533] Faulting instruction address: 0xc000000000e8b9bc [ 55.022540] Oops: Kernel access of bad area, sig: 11 [#1] .... when the kernel access userspace address without unlocking AMR. bad_kuap_fault() is added as part of commit 5e5be3aed230 ("powerpc/mm: Detect bad KUAP faults") to catch userspace access incorrectly blocked by AMR. Hence retain the full stack dump there even with hash translation. Also, add a comment explaining the difference between hash and radix. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201208031539.84878-1-aneesh.kumar@linux.ibm.com
2020-12-07powerpc/book3s64/kexec: Clear CIABR on kexecJordan Niethe1-0/+5
The value in CIABR persists across kexec which can lead to unintended results when the new kernel hits the old kernel's breakpoint. For example: 0:mon> bi $loadavg_proc_show 0:mon> b type address 1 inst c000000000519060 loadavg_proc_show+0x0/0x130 0:mon> x $ kexec -l /mnt/vmlinux --initrd=/mnt/rootfs.cpio.gz --append='xmon=off' $ kexec -e $ cat /proc/loadavg Trace/breakpoint trap Make sure CIABR is cleared so this does not happen. Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207010519.15597-1-jniethe5@gmail.com
2020-12-05Merge tag 'powerpc-5.10-5' of ↵Linus Torvalds1-0/+12
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc fixes from Michael Ellerman: "Some more powerpc fixes for 5.10: - Three commits fixing possible missed TLB invalidations for multi-threaded processes when CPUs are hotplugged in and out. - A fix for a host crash triggerable by host userspace (qemu) in KVM on Power9. - A fix for a host crash in machine check handling when running HPT guests on a HPT host. - One commit fixing potential missed TLB invalidations when using the hash MMU on Power9 or later. - A regression fix for machines with CPUs on node 0 but no memory. Thanks to Aneesh Kumar K.V, Cédric Le Goater, Greg Kurz, Milan Mohanty, Milton Miller, Nicholas Piggin, Paul Mackerras, and Srikar Dronamraju" * tag 'powerpc-5.10-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/64s/powernv: Fix memory corruption when saving SLB entries on MCE KVM: PPC: Book3S HV: XIVE: Fix vCPU id sanity check powerpc/numa: Fix a regression on memoryless node 0 powerpc/64s: Trim offlined CPUs from mm_cpumasks kernel/cpu: add arch override for clear_tasks_mm_cpumask() mm handling powerpc/64s/pseries: Fix hash tlbiel_all_isa300 for guest kernels powerpc/64s: Fix hash ISA v3.0 TLBIEL instruction generation
2020-12-04powerpc: Fix incorrect stw{, ux, u, x} instructions in __set_pte_atMathieu Desnoyers1-2/+2
The placeholder for instruction selection should use the second argument's operand, which is %1, not %0. This could generate incorrect assembly code if the memory addressing of operand %0 is a different form from that of operand %1. Also remove the %Un placeholder because having %Un placeholders for two operands which are based on the same local var (ptep) doesn't make much sense. By the way, it doesn't change the current behaviour because "<>" constraint is missing for the associated "=m". [chleroy: revised commit log iaw segher's comments and removed %U0] Fixes: 9bf2b5cdc5fe ("powerpc: Fixes for CONFIG_PTE_64BIT for SMP support") Cc: <stable@vger.kernel.org> # v2.6.28+ Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Acked-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/96354bd77977a6a933fe9020da57629007fdb920.1603358942.git.christophe.leroy@csgroup.eu
2020-12-03lkdtm/powerpc: Add SLB multihit testGanesh Goudar1-1/+27
To check machine check handling, add support to inject slb multihit errors. Co-developed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Signed-off-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com> [mpe: Use CONFIG_PPC_BOOK3S_64 to fix compile errors reported by lkp@intel.com] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201130083057.135610-1-ganeshgr@linux.ibm.com
2020-12-03powerpc/book3s64/pkeys: Optimize KUAP and KUEP feature disabled caseAneesh Kumar K.V1-6/+57
If FTR_BOOK3S_KUAP is disabled, kernel will continue to run with the same AMR value with which it was entered. Hence there is a high chance that we can return without restoring the AMR value. This also helps the case when applications are not using the pkey feature. In this case, different applications will have the same AMR values and hence we can avoid restoring AMR in this case too. Also avoid isync() if not really needed. Do the same for IAMR. null-syscall benchmark results: With smap/smep disabled: Without patch: 957.95 ns 2778.17 cycles With patch: 858.38 ns 2489.30 cycles With smap/smep enabled: Without patch: 1017.26 ns 2950.36 cycles With patch: 1021.51 ns 2962.44 cycles Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-23-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/kuep: Use Key 3 to implement KUEP with hash translation.Aneesh Kumar K.V1-1/+1
Radix use IAMR Key 0 and hash translation use IAMR key 3. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-19-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/kuap: Use Key 3 to implement KUAP with hash translation.Aneesh Kumar K.V1-5/+4
Radix use AMR Key 0 and hash translation use AMR key 3. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-18-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/kuap: Improve error reporting with KUAPAneesh Kumar K.V2-7/+24
With hash translation use DSISR_KEYFAULT to identify a wrong access. With Radix we look at the AMR value and type of fault. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-17-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/kuap: Restrict access to userspace based on userspace AMRAneesh Kumar K.V1-3/+9
If an application has configured address protection such that read/write is denied using pkey even the kernel should receive a FAULT on accessing the same. This patch use user AMR value stored in pt_regs.amr to achieve the same. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-16-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/pkeys: Don't update SPRN_AMR when in kernel mode.Aneesh Kumar K.V1-0/+21
Now that kernel correctly store/restore userspace AMR/IAMR values, avoid manipulating AMR and IAMR from the kernel on behalf of userspace. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-15-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/pkeys: Reset userspace AMR correctly on execAneesh Kumar K.V1-0/+2
On fork, we inherit from the parent and on exec, we should switch to default_amr values. Also, avoid changing the AMR register value within the kernel. The kernel now runs with different AMR values. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-13-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/pkeys: Store/restore userspace AMR/IAMR correctly on entry ↵Aneesh Kumar K.V1-39/+183
and exit from kernel This prepare kernel to operate with a different value than userspace AMR/IAMR. For this, AMR/IAMR need to be saved and restored on entry and return from the kernel. With KUAP we modify kernel AMR when accessing user address from the kernel via copy_to/from_user interfaces. We don't need to modify IAMR value in similar fashion. If MMU_FTR_PKEY is enabled we need to save AMR/IAMR in pt_regs on entering kernel from userspace. If not we can assume that AMR/IAMR is not modified from userspace. We need to save AMR if we have MMU_FTR_BOOK3S_KUAP feature enabled and we are interrupted within kernel. This is required so that if we get interrupted within copy_to/from_user we continue with the right AMR value. If we hae MMU_FTR_BOOK3S_KUEP enabled we need to restore IAMR on return to userspace beause kernel will be running with a different IAMR value. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-11-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/kuap: Use Key 3 for kernel mapping with hash translationAneesh Kumar K.V3-7/+21
This patch updates kernel hash page table entries to use storage key 3 for its mapping. This implies all kernel access will now use key 3 to control READ/WRITE. The patch also prevents the allocation of key 3 from userspace and UAMOR value is updated such that userspace cannot modify key 3. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-9-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/kuap: Rename MMU_FTR_RADIX_KUAP and MMU_FTR_KUEPAneesh Kumar K.V1-9/+9
This is in preparation to adding support for kuap with hash translation. In preparation for that rename/move kuap related functions to non radix names. Also move the feature bit closer to MMU_FTR_KUEP. MMU_FTR_KUEP is renamed to MMU_FTR_BOOK3S_KUEP to indicate the feature is only relevant to BOOK3S_64 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-8-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/kuep: Move KUEP related function outside radixAneesh Kumar K.V1-0/+1
The next set of patches adds support for kuep with hash translation. In preparation for that rename/move kuap related functions to non radix names. Also set MMU_FTR_KUEP and add the missing isync(). Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-7-aneesh.kumar@linux.ibm.com
2020-12-03powerpc/book3s64/kuap: Move KUAP related function outside radixAneesh Kumar K.V1-3/+3
The next set of patches adds support for kuap with hash translation. In preparation for that rename/move kuap related functions to non radix names. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-6-aneesh.kumar@linux.ibm.com
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