- 28 May, 2020 21 commits
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Nicholas Piggin authored
Writing the AMR register is documented to require context synchronizing operations before and after, for it to take effect as expected. The KUAP restore at interrupt exit time deliberately avoids the isync after the AMR update because it only needs to take effect after the context synchronizing RFID that soon follows. Add a comment for this. The missing isync before the update doesn't have an obvious justification, and seems it could theoretically allow a rogue user access to leak past the AMR update. Add isyncs for these. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200429065654.1677541-3-npiggin@gmail.com
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huhai authored
Signed-off-by:
huhai <huhai@tj.kylinos.cn> Signed-off-by:
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Christophe Leroy authored
We have r12 available, use it to keep CR around and don't save it in SPRN_SPRG_SCRATCH6. Signed-off-by:
Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by:
Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by:
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Christophe Leroy authored
Let's reduce the number of registers used in TLB miss handlers. We have both r9 and r12 available for any temporary use. r9 is enough, avoid using r12. Signed-off-by:
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Christophe Leroy authored
This erratum is dedicated to IBM 405GP and STB03xxx which are now gone. Remove this erratum. Signed-off-by:
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Christophe Leroy authored
This erratum was for IBM 403GCX, 405EP and STB03xxx which are now gone. Remove this erratum. Signed-off-by:
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Christophe Leroy authored
All platforms selecting the obsolete processor are gone now. Remove support for it. Signed-off-by:
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Christophe Leroy authored
ISS4xx has support for 405GP which is obsolete. Remote it. Signed-off-by:
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Christophe Leroy authored
EP405 is an old type of board based on a 405GP which is obsolete. Remove it. Signed-off-by:
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Christophe Leroy authored
CONFIG_WALNUT is not selected by any config and is based on 405GP which is obsolete. Remove it. Signed-off-by:
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Christophe Leroy authored
CONFIG_STB03xxx is not user selectable and is not selected by any config. Remove it. Signed-off-by:
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Christophe Leroy authored
CONFIG_403GCX is not user selectable and is not selected by any platform. Remove it. Signed-off-by:
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Christophe Leroy authored
40x was the last user of PTE_ATOMIC_UPDATES. Drop everything related to PTE_ATOMIC_UPDATES. Signed-off-by:
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Christophe Leroy authored
Commit 1bc54c03 ("powerpc: rework 4xx PTE access and TLB miss") reworked 44x PTE access to avoid atomic pte updates, and left 8xx, 40x and fsl booke with atomic pte updates. Commit 6cfd8990 ("powerpc: rework FSL Book-E PTE access and TLB miss") removed atomic pte updates on fsl booke. It went away on 8xx with commit ddfc20a3 ("powerpc/8xx: Remove PTE_ATOMIC_UPDATES"). 40x is the last platform setting PTE_ATOMIC_UPDATES. Rework PTE access and TLB miss to remove PTE_ATOMIC_UPDATES for 40x: - Always handle DSI as a fault. - Bail out of TLB miss handler when CONFIG_SWAP is set and _PAGE_ACCESSED is not set. - Bail out of ITLB miss handler when _PAGE_EXEC is not set. - Only set WR bit when both _PAGE_RW and _PAGE_DIRTY are set. - Remove _PAGE_HWWRITE - Don't require PTE_ATOMIC_UPDATES anymore Reported-by:
kbuild test robot <lkp@intel.com> Signed-off-by:
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Michal Simek authored
Xilinx PowerPC platforms are no longer supported and none is really testing these platforms that's why remove them. If someone has any issue with it these patches can be reverted. Signed-off-by:
Michal Simek <michal.simek@xilinx.com> Acked-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Michal Simek authored
The latest Xilinx design tools called ISE and EDK has been released in October 2013. New tool doesn't support any PPC405/PPC440 new designs. These platforms are no longer supported and tested. PowerPC 405/440 port is orphan from 2013 by commit cdeb8994 ("MAINTAINERS: Fix incorrect status tag") and commit 19624236 ("MAINTAINERS: Update Grant's email address and maintainership") that's why it is time to remove the support fot these platforms. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Nicholas Piggin authored
The same complicated sequence for juggling EE, RI, soft mask, and irq tracing is repeated 3 times, tidy these up into one function. This differs qiute a bit between sub architectures, so this makes the ppc32 port cleaner as well. Signed-off-by:
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Nicholas Piggin authored
The idea behind this prefetch was to kick off a page table walk before returning from the fault, getting some pipelining advantage. But this never showed up any noticable performance advantage, and in fact with KUAP the prefetches are actually blocked and cause some kind of micro-architectural fault. Removing this improves page fault microbenchmark performance by about 9%. Signed-off-by:
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Nathan Chancellor authored
This causes a build error with CONFIG_WALNUT because kb_cs and kb_data were removed in commit 917f0af9 ("powerpc: Remove arch/ppc and include/asm-ppc"). ld.lld: error: undefined symbol: kb_cs > referenced by i8042-ppcio.h:28 (drivers/input/serio/i8042-ppcio.h:28) > input/serio/i8042.o:(__i8042_command) in archive drivers/built-in.a > referenced by i8042-ppcio.h:28 (drivers/input/serio/i8042-ppcio.h:28) > input/serio/i8042.o:(__i8042_command) in archive drivers/built-in.a > referenced by i8042-ppcio.h:28 (drivers/input/serio/i8042-ppcio.h:28) > input/serio/i8042.o:(__i8042_command) in archive drivers/built-in.a ld.lld: error: undefined symbol: kb_data > referenced by i8042.c:309 (drivers/input/serio/i8042.c:309) > input/serio/i8042.o:(__i8042_command) in archive drivers/built-in.a > referenced by i8042-ppcio.h:33 (drivers/input/serio/i8042-ppcio.h:33) > input/serio/i8042.o:(__i8042_command) in archive drivers/built-in.a > referenced by i8042.c:319 (drivers/input/serio/i8042.c:319) > input/serio/i8042.o:(__i8042_command) in archive drivers/built-in.a > referenced 15 more times Presumably since nobody has noticed this for the last 12 years, there is not anyone actually trying to use this driver so we can just remove this special walnut code and use the generic header so it builds for all configurations. Fixes: 917f0af9 ("powerpc: Remove arch/ppc and include/asm-ppc") Reported-by:
Nathan Chancellor <natechancellor@gmail.com> Signed-off-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> Link: https://lore.kernel.org/r/20200518181043.3363953-1-natechancellor@gmail.com
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Dmitry Torokhov authored
Now that instances of input_dev support polling mode natively, we no longer need to create input_polled_dev instance. Signed-off-by:
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Cédric Le Goater authored
The XIVE interrupt mode can be disabled with the "xive=off" kernel parameter, in which case there is nothing to present to the user in the associated /sys/kernel/debug/powerpc/xive file. Fixes: 930914b7 ("powerpc/xive: Add a debugfs file to dump internal XIVE state") Signed-off-by:
Cédric Le Goater <clg@kaod.org> Signed-off-by:
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- 26 May, 2020 19 commits
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Cédric Le Goater authored
Commit 1ca3dec2 ("powerpc/xive: Prevent page fault issues in the machine crash handler") fixed an issue in the FW assisted dump of machines using hash MMU and the XIVE interrupt mode under the POWER hypervisor. It forced the mapping of the ESB page of interrupts being mapped in the Linux IRQ number space to make sure the 'crash kexec' sequence worked during such an event. But it didn't handle the un-mapping. This mapping is now blocking the removal of a passthrough IO adapter under the POWER hypervisor because it expects the guest OS to have cleared all page table entries related to the adapter. If some are still present, the RTAS call which isolates the PCI slot returns error 9001 "valid outstanding translations". Remove these mapping in the IRQ data cleanup routine. Under KVM, this cleanup is not required because the ESB pages for the adapter interrupts are un-mapped from the guest by the hypervisor in the KVM XIVE native device. This is now redundant but it's harmless. Fixes: 1ca3dec2 ("powerpc/xive: Prevent page fault issues in the machine crash handler") Cc: stable@vger.kernel.org # v5.5+ Signed-off-by:
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Michael Ellerman authored
The code patching code wants to get the value of a struct ppc_inst as a u64 when the instruction is prefixed, so we can pass the u64 down to __put_user_asm() and write it with a single store. The optprobes code wants to load a struct ppc_inst as an immediate into a register so it is useful to have it as a u64 to use the existing helper function. Currently this is a bit awkward because the value differs based on the CPU endianness, so add a helper to do the conversion. This fixes the usage in arch_prepare_optimized_kprobe() which was previously incorrect on big endian. Fixes: 650b55b7 ("powerpc: Add prefixed instructions to instruction data type") Signed-off-by:
Jordan Niethe <jniethe5@gmail.com> Link: https://lore.kernel.org/r/20200526072630.2487363-1-mpe@ellerman.id.au
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Michael Ellerman authored
In a few places we want to calculate the address of the next instruction. Previously that was simple, we just added 4 bytes, or if using a u32 * we incremented that pointer by 1. But prefixed instructions make it more complicated, we need to advance by either 4 or 8 bytes depending on the actual instruction. We also can't do pointer arithmetic using struct ppc_inst, because it is always 8 bytes in size on 64-bit, even though we might only need to advance by 4 bytes. So add a ppc_inst_next() helper which calculates the location of the next instruction, if the given instruction was located at the given address. Note the instruction doesn't need to actually be at the address in memory. Although it would seem natural for the value to be passed by value, that makes it too easy to write a loop that will read off the end of a page, eg: for (; src < end; src = ppc_inst_next(src, *src), dest = ppc_inst_next(dest, *dest)) As noticed by Christophe and Jordan, if end is the exact end of a page, and the next page is not mapped, this will fault, because *dest will read 8 bytes, 4 bytes into the next page. So value is passed by reference, so the helper can be careful to use ppc_inst_read() on it. Signed-off-by:
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Michael Ellerman authored
Merge our fixes branch from this cycle. It contains several important fixes we need in next for testing purposes, and also some that will conflict with upcoming changes.
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Michael Ellerman authored
Merge Christophe's large series to use huge pages for the linear mapping on 8xx. From his cover letter: The main purpose of this big series is to: - reorganise huge page handling to avoid using mm_slices. - use huge pages to map kernel memory on the 8xx. The 8xx supports 4 page sizes: 4k, 16k, 512k and 8M. It uses 2 Level page tables, PGD having 1024 entries, each entry covering 4M address space. Then each page table has 1024 entries. At the time being, page sizes are managed in PGD entries, implying the use of mm_slices as it can't mix several pages of the same size in one page table. The first purpose of this series is to reorganise things so that standard page tables can also handle 512k pages. This is done by adding a new _PAGE_HUGE flag which will be copied into the Level 1 entry in the TLB miss handler. That done, we have 2 types of pages: - PGD entries to regular page tables handling 4k/16k and 512k pages - PGD entries to hugepd tables handling 8M pages. There is no need to mix 8M pages with other sizes, because a 8M page will use more than what a single PGD covers. Then comes the second purpose of this series. At the time being, the 8xx has implemented special handling in the TLB miss handlers in order to transparently map kernel linear address space and the IMMR using huge pages by building the TLB entries in assembly at the time of the exception. As mm_slices is only for user space pages, and also because it would anyway not be convenient to slice kernel address space, it was not possible to use huge pages for kernel address space. But after step one of the series, it is now more flexible to use huge pages. This series drop all assembly 'just in time' handling of huge pages and use huge pages in page tables instead. Once the above is done, then comes icing on the cake: - Use huge pages for KASAN shadow mapping - Allow pinned TLBs with strict kernel rwx - Allow pinned TLBs with debug pagealloc Then, last but not least, those modifications for the 8xx allows the following improvement on book3s/32: - Mapping KASAN shadow with BATs - Allowing BATs with debug pagealloc All this allows to considerably simplify TLB miss handlers and associated initialisation. The overhead of reading page tables is negligible compared to the reduction of the miss handlers. While we were at touching pte_update(), some cleanup was done there too. Tested widely on 8xx and 832x. Boot tested on QEMU MAC99.
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Christophe Leroy authored
Implement a kasan_init_region() dedicated to book3s/32 that allocates KASAN regions using BATs. Signed-off-by:
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Christophe Leroy authored
DEBUG_PAGEALLOC only manages RW data. Text and RO data can still be mapped with BATs. In order to map with BATs, also enforce data alignment. Set by default to 256M which is a good compromise for keeping enough BATs for also KASAN and IMMR. Signed-off-by:
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Christophe Leroy authored
Implement a kasan_init_region() dedicated to 8xx that allocates KASAN regions using huge pages. Signed-off-by:
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Christophe Leroy authored
DEBUG_PAGEALLOC only manages RW data. Text and RO data can still be mapped with hugepages and pinned TLB. In order to map with hugepages, also enforce a 512kB data alignment minimum. That's a trade-off between size of speed, taking into account that DEBUG_PAGEALLOC is a debug option. Anyway the alignment is still tunable. We also allow tuning of alignment for book3s to limit the complexity of the test in Kconfig that will anyway disappear in the following patches once DEBUG_PAGEALLOC is handled together with BATs. Signed-off-by:
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Christophe Leroy authored
Pinned TLB are 8M. Now that there is no strict boundary anymore between text and RO data, it is possible to use 8M pinned executable TLB that covers both text and RO data. When PIN_TLB_DATA or PIN_TLB_TEXT is selected, enforce 8M RW data alignment and allow STRICT_KERNEL_RWX. Signed-off-by:
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Christophe Leroy authored
Map linear memory space with 512k and 8M pages whenever possible. Three mappings are performed: - One for kernel text - One for RO data - One for the rest Separating the mappings is done to be able to update the protection later when using STRICT_KERNEL_RWX. The ITLB miss handler now need to also handle huge TLBs unless kernel text in pinned. Signed-off-by:
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Christophe Leroy authored
Map the IMMR area with a single 512k huge page. Signed-off-by:
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Christophe Leroy authored
Add a function to early map kernel memory using huge pages. For 512k pages, just use standard page table and map in using 512k pages. For 8M pages, create a hugepd table and populate the two PGD entries with it. This function can only be used to create page tables at startup. Once the regular SLAB allocation functions replace memblock functions, this function cannot allocate new pages anymore. However it can still update existing mappings with new protections. hugepd_none() macro is moved into asm/hugetlb.h to be usable outside of mm/hugetlbpage.c early_pte_alloc_kernel() is made visible. _PAGE_HUGE flag is now displayed by ptdump. Signed-off-by:
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Christophe Leroy authored
Now that linear and IMMR dedicated TLB handling is gone, kernel boundary address comparison is similar in ITLB miss handler and in DTLB miss handler. Create a macro named compare_to_kernel_boundary. When TASK_SIZE is strictly below 0x80000000 and PAGE_OFFSET is above 0x80000000, it is enough to compare to 0x8000000, and this can be done with a single instruction. Using not. instruction, we get to use 'blt' conditional branch as when doing a regular comparison: 0x00000000 <= addr <= 0x7fffffff ==> 0xffffffff >= NOT(addr) >= 0x80000000 The above test corresponds to a 'blt' Otherwise, do a regular comparison using two instructions. Signed-off-by:
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Christophe Leroy authored
Similar to PPC64, accept to map RO data as ROX as a trade off between between security and memory usage. Having RO data executable is not a high risk as RO data can't be modified to forge an exploit. Signed-off-by:
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Christophe Leroy authored
Now that space have been freed next to the DTLB miss handler, it's associated DTLB perf handling can be brought back in the same place. Signed-off-by:
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Christophe Leroy authored
The code to setup linear and IMMR mapping via huge TLB entries is not called anymore. Remove it. Also remove the handling of removed code exits in the perf driver. Signed-off-by:
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Christophe Leroy authored
Up to now, linear and IMMR mappings are managed via huge TLB entries through specific code directly in TLB miss handlers. This implies some patching of the TLB miss handlers at startup, and a lot of dedicated code. Remove all this specific dedicated code. For now we are back to normal handling via standard 4k pages. In the next patches, linear memory mapping and IMMR mapping will be managed through huge pages. Signed-off-by:
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Christophe Leroy authored
At startup, map 32 Mbytes of memory through 4 pages of 8M, and PIN them inconditionnaly. They need to be pinned because KASAN is using page tables early and the TLBs might be dynamically replaced otherwise. Remove RSV4I flag after installing mappings unless CONFIG_PIN_TLB_XXXX is selected. Signed-off-by:
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