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* Merge tag 'kbuild-v5.15' of ↵Linus Torvalds2021-09-041-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild updates from Masahiro Yamada: - Add -s option (strict mode) to merge_config.sh to make it fail when any symbol is redefined. - Show a warning if a different compiler is used for building external modules. - Infer --target from ARCH for CC=clang to let you cross-compile the kernel without CROSS_COMPILE. - Make the integrated assembler default (LLVM_IAS=1) for CC=clang. - Add <linux/stdarg.h> to the kernel source instead of borrowing <stdarg.h> from the compiler. - Add Nick Desaulniers as a Kbuild reviewer. - Drop stale cc-option tests. - Fix the combination of CONFIG_TRIM_UNUSED_KSYMS and CONFIG_LTO_CLANG to handle symbols in inline assembly. - Show a warning if 'FORCE' is missing for if_changed rules. - Various cleanups * tag 'kbuild-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (39 commits) kbuild: redo fake deps at include/ksym/*.h kbuild: clean up objtool_args slightly modpost: get the *.mod file path more simply checkkconfigsymbols.py: Fix the '--ignore' option kbuild: merge vmlinux_link() between ARCH=um and other architectures kbuild: do not remove 'linux' link in scripts/link-vmlinux.sh kbuild: merge vmlinux_link() between the ordinary link and Clang LTO kbuild: remove stale *.symversions kbuild: remove unused quiet_cmd_update_lto_symversions gen_compile_commands: extract compiler command from a series of commands x86: remove cc-option-yn test for -mtune= arc: replace cc-option-yn uses with cc-option s390: replace cc-option-yn uses with cc-option ia64: move core-y in arch/ia64/Makefile to arch/ia64/Kbuild sparc: move the install rule to arch/sparc/Makefile security: remove unneeded subdir-$(CONFIG_...) kbuild: sh: remove unused install script kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y kbuild: Switch to 'f' variants of integrated assembler flag kbuild: Shuffle blank line to improve comment meaning ...
| * isystem: ship and use stdarg.hAlexey Dobriyan2021-08-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | Ship minimal stdarg.h (1 type, 4 macros) as <linux/stdarg.h>. stdarg.h is the only userspace header commonly used in the kernel. GPL 2 version of <stdarg.h> can be extracted from http://archive.debian.org/debian/pool/main/g/gcc-4.2/gcc-4.2_4.2.4.orig.tar.gz Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
* | Merge tag 's390-5.15-1' of ↵Linus Torvalds2021-08-3016-316/+134
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Heiko Carstens: - Improve ftrace code patching so that stop_machine is not required anymore. This requires a small common code patch acked by Steven Rostedt: https://lore.kernel.org/linux-s390/20210730220741.4da6fdf6@oasis.local.home/ - Enable KCSAN for s390. This comes with a small common code change to fix a compile warning. Acked by Marco Elver: https://lore.kernel.org/r/20210729142811.1309391-1-hca@linux.ibm.com - Add KFENCE support for s390. This also comes with a minimal x86 patch from Marco Elver who said also this can be carried via the s390 tree: https://lore.kernel.org/linux-s390/YQJdarx6XSUQ1tFZ@elver.google.com/ - More changes to prepare the decompressor for relocation. - Enable DAT also for CPU restart path. - Final set of register asm removal patches; leaving only three locations where needed and sane. - Add NNPA, Vector-Packed-Decimal-Enhancement Facility 2, PCI MIO support to hwcaps flags. - Cleanup hwcaps implementation. - Add new instructions to in-kernel disassembler. - Various QDIO cleanups. - Add SCLP debug feature. - Various other cleanups and improvements all over the place. * tag 's390-5.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (105 commits) s390: remove SCHED_CORE from defconfigs s390/smp: do not use nodat_stack for secondary CPU start s390/smp: enable DAT before CPU restart callback is called s390: update defconfigs s390/ap: fix state machine hang after failure to enable irq KVM: s390: generate kvm hypercall functions s390/sclp: add tracing of SCLP interactions s390/debug: add early tracing support s390/debug: fix debug area life cycle s390/debug: keep debug data on resize s390/diag: make restart_part2 a local label s390/mm,pageattr: fix walk_pte_level() early exit s390: fix typo in linker script s390: remove do_signal() prototype and do_notify_resume() function s390/crypto: fix all kernel-doc warnings in vfio_ap_ops.c s390/pci: improve DMA translation init and exit s390/pci: simplify CLP List PCI handling s390/pci: handle FH state mismatch only on disable s390/pci: fix misleading rc in clp_set_pci_fn() s390/boot: factor out offset_vmlinux_info() function ...
| * s390/boot: factor out offset_vmlinux_info() functionAlexander Gordeev2021-08-251-8/+12
| | | | | | | | | | | | | | | | | | Move offsetting all of vmlinux_info fields to a separate function for better readability. Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390: move the install rule to arch/s390/MakefileMasahiro Yamada2021-07-301-4/+0
| | | | | | | | | | | | | | | | | | | | | | | | Currently, the install target in arch/s390/Makefile descends into arch/s390/boot/Makefile to invoke the shell script, but there is no good reason to do so. arch/s390/Makefile can run the shell script directly. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Link: https://lore.kernel.org/r/20210729142338.446002-1-masahiroy@kernel.org Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390: enable KCSANIlya Leoshkevich2021-07-302-0/+2
| | | | | | | | | | | | | | | | | | | | | | s390x GCC and SystemZ Clang have ThreadSanitizer support now [1] [2], so enable KCSAN for s390. [1] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ea22954e7c58 [2] https://reviews.llvm.org/D105629 Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: get rid of arithmetics on function pointersHeiko Carstens2021-07-271-1/+1
| | | | | | | | | | | | | | | | sparse warning: CHECK arch/s390/boot/startup.c arch/s390/boot/startup.c:283:39: error: arithmetics on pointers to functions Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: move dma sections from decompressor to decompressed kernelAlexander Egorenkov2021-07-276-247/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This change simplifies the task of making the decompressor relocatable. The decompressor's image contains special DMA sections between _sdma and _edma. This DMA segment is loaded at boot as part of the decompressor and then simply handed over to the decompressed kernel. The decompressor itself never uses it in any way. The primary reason for this is the need to keep the aforementioned DMA segment below 2GB which is required by architecture, and because the decompressor is always loaded at a fixed low physical address, it is guaranteed that the DMA region will not cross the 2GB memory limit. If the DMA region had been placed in the decompressed kernel, then KASLR would make this guarantee impossible to fulfill or it would be restricted to the first 2GB of memory address space. This commit moves all DMA sections between _sdma and _edma from the decompressor's image to the decompressed kernel's image. The complete DMA region is placed in the init section of the decompressed kernel and immediately relocated below 2GB at start-up before it is needed by other parts of the decompressed kernel. The relocation of the DMA region happens even if the decompressed kernel is already located below 2GB in order to keep the first implementation simple. The relocation should not have any noticeable impact on boot time because the DMA segment is only a couple of pages. After relocating the DMA sections, the kernel has to fix all references which point into it. In order to automate this, place all variables pointing into the DMA sections in a special .dma.refs section. All such variables must be defined using the new __dma_ref macro. Only variables containing addresses within the DMA sections must be placed in the new .dma.refs section. Furthermore, move the initialization of control registers from the decompressor to the decompressed kernel because some control registers reference tables that must be placed in the DMA data section to guarantee that their addresses are below 2G. Because the decompressed kernel relocates the DMA sections at startup, the content of control registers CR2, CR5 and CR15 must be updated with new addresses after the relocation. The decompressed kernel initializes all control registers early at boot and then updates the content of CR2, CR5 and CR15 as soon as the DMA relocation has occurred. This practically reverts the commit a80313ff91ab ("s390/kernel: introduce .dma sections"). Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: make _diag308_reset_dma() position-independentAlexander Egorenkov2021-07-271-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As a preparation for moving the .dma.data section from the decompressor to the decompressed kernel, the .dma.data section must be made relocatable by replacing absolute memory addressing with relative one. This is required in order to be able to relocate the DMA section to a memory address <= 2G as required by the hardware architecture. The DMA section must be relocated in case the decompressed kernel was loaded to an address >= 2G which can occur if KASAN is enabled. By making the whole DMA section position-independent we avoid applying relocations to it whenever it is moved to a different address, which becomes possible as soon as it becomes a part of the decompressed kernel. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: move EP_OFFSET and EP_STRING to head.SAlexander Egorenkov2021-07-271-0/+3
| | | | | | | | | | | | | | | | | | Both macros are used only in decompressor's head.S, unnecessary to put them in a global header used in many places like setup.h is. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/dump: introduce boot data 'oldmem_data'Alexander Egorenkov2021-07-272-3/+6
| | | | | | | | | | | | | | | | | | | | | | | | The new boot data struct shall replace global variables OLDMEM_BASE and OLDMEM_SIZE. It is initialized in the decompressor and passed to the decompressed kernel. In comparison to the old solution, this one doesn't access data at fixed physical addresses which will become important when the decompressor becomes relocatable. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: introduce boot data 'initrd_data'Alexander Egorenkov2021-07-274-13/+17
| | | | | | | | | | | | | | | | | | | | | | | | The new boot data struct shall replace global variables INITRD_START and INITRD_SIZE. It is initialized in the decompressor and passed to the decompressed kernel. In comparison to the old solution, this one doesn't access data at fixed physical addresses which will become important when the decompressor becomes relocatable. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: move sclp early buffer from fixed address in asm to CAlexander Egorenkov2021-07-274-4/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To make the decompressor relocatable, the early SCLP buffer with a fixed address must be replaced with a relocatable C buffer of the according size and alignment as required by SCLP. Introduce a new function sclp_early_set_buffer() into the SCLP driver which enables the decompressor to change the SCLP early buffer at any time. This will be useful when the decompressor becomes fully relocatable and might need to change the SCLP early buffer to one with an address < 2G as required by SCLP because it was loaded at an address >= 2G. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: get rid of magic numbers for startup offsetsAlexander Egorenkov2021-07-271-4/+4
| | | | | | | | | | | | | | | | Use STARTUP_NORMAL_OFFSET and STARTUP_KDUMP_OFFSET instead of magic numbers. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/uv: de-duplicate checks for Protected Host VirtualizationAlexander Egorenkov2021-07-271-19/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | De-duplicate checks for Protected Host Virtualization in decompressor and kernel. Set prot_virt_host=0 in the decompressor in *any* of the following cases and hand it over to the decompressed kernel: * No explicit prot_virt=1 is given on the kernel command-line * Protected Guest Virtualization is enabled * Hardware support not present * kdump or stand-alone dump The decompressed kernel needs to use only is_prot_virt_host() instead of performing again all checks done by the decompressor. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: disable Secure Execution in dump modeAlexander Egorenkov2021-07-273-0/+11
| | | | | | | | | | | | | | | | A dump kernel is neither required nor able to support Secure Execution. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: move uv function declarations to boot/uv.hAlexander Egorenkov2021-07-273-0/+20
| | | | | | | | | | | | | | | | | | | | The functions adjust_to_uv_max() and uv_query_info() are used only in the decompressor. Therefore, move the function declarations from the global arch/s390/include/asm/uv.h to arch/s390/boot/uv.h. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/sclp: use only one sclp early buffer to send commandsAlexander Egorenkov2021-07-271-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A buffer that can be used for communication with SCLP is required to lie below 2GB memory address. Therefore, both sclp_info_sccb and sclp_early_sccb must fulfill this requirement if passed directly to the sclp_early_cmd() function. Instead, use only sclp_early_sccb for communication with SCLP. This allows the buffer sclp_info_sccb to be placed anywhere in the memory address space and, therefore, simplifies the process of making the decompressor relocatable later on, one thing less to relocate. And make sure that the length of the new unified early SCLP buffer is no less than the length of the removed sclp_info_sccb buffer which might be larger than the length of the sclp_early_sccb buffer. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/cio: remove unused include linux/spinlock.h from cio.hAlexander Egorenkov2021-07-271-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | * The linux/spinlock.h header was included indirectly by the decompressor and brought unnecessary build dependencies. * Use proper includes in files which either directly or indirectly included cio.h and were hidden until now by the included linux/spinlock.h, e.g. linux/string.h for memcpy() or asm/page.h for PAGE_SIZE. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Acked-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: make stacks part of the decompressor's imageAlexander Egorenkov2021-07-274-17/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of using constant addresses for the normal and dump-info stacks, allocate both stacks in the decompressor's image and load the stack register in a position-independent manner. This will allow loading and entering the decompressor at an arbitrary memory address without corrupting the content at the fixed addresses used until now for both stacks. This is one of the prerequisites for being able to kexec the decompressor from its load address without relocating it first. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
| * s390/boot: move all linker symbol declarations from c to h filesAlexander Egorenkov2021-07-275-13/+14
| | | | | | | | | | | | | | | | | | | | To prevent multiple incompatible declarations of symbols and to catch such mistakes at compile time. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Acked-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* | s390/boot: fix zstd build for -march=z900Vasily Gorbik2021-07-302-0/+3
|/ | | | | | | | | | | | | | | zstd decompression uses __builtin_clz() which fails back to __clzdi2() when the kernel is built for older hardware like z900. This leads to build failures like the following: s390x-11.1.0-ld: /devel/src/kernel/arch/s390/boot/compressed/../../../../lib/zstd/bitstream.h:148: undefined reference to `__clzdi2' Fix that by optionally including lib/clz_ctz.c into the decompressor. Reported-by: kernel test robot <lkp@intel.com> Fixes: 7b034d9c1b08 ("s390/boot: add zstd support") Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Link: https://lore.kernel.org/r/patch-1.thread-f0f589.git-f0f58936888f.your-ad-here.call-01627564869-ext-2765@work.hours Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/boot: fix use of expolines in the DMA codeAlexander Egorenkov2021-07-201-15/+4
| | | | | | | | | | | | | | | | | | The DMA code section of the decompressor must be compiled with expolines if Spectre V2 mitigation has been enabled for the decompressed kernel. This is required because although the decompressor's image contains the DMA code section, it is handed over to the decompressed kernel for use. Because the DMA code is already slow w/o expolines, use expolines always regardless whether the decompressed kernel is using them or not. This simplifies the DMA code by dropping the conditional compilation of expolines. Fixes: bf72630130c2 ("s390: use proper expoline sections for .dma code") Cc: <stable@vger.kernel.org> # 5.2 Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/boot: replace magic string check with a bootdata flagAlexander Egorenkov2021-07-051-0/+1
| | | | | | | | | | | The magic string "S390EP" at offset 0x10008 indicated to the decompressed kernel that it was booted by the decompressor. Introduce a new bootdata flag instead which conveys the same information in an explicit and a cleaner way. But keep the magic string because it is a kernel ABI. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: mm: Fix secure storage access exception handlingJanosch Frank2021-07-051-0/+1
| | | | | | | | | | | | | | | | | Turns out that the bit 61 in the TEID is not always 1 and if that's the case the address space ID and the address are unpredictable. Without an address and its address space ID we can't export memory and hence we can only send a SIGSEGV to the process or panic the kernel depending on who caused the exception. Unfortunately bit 61 is only reliable if we have the "misc" UV feature bit. Signed-off-by: Janosch Frank <frankja@linux.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Fixes: 084ea4d611a3d ("s390/mm: add (non)secure page access exceptions handlers") Cc: stable@vger.kernel.org Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/mem_detect: fix tprot() program check new psw handlingHeiko Carstens2021-06-181-11/+17
| | | | | | | | | | | | | | | | | | | The tprot() inline asm temporarily changes the program check new psw to redirect a potential program check on the diag instruction. Restoring of the program check new psw is done in C code behind the inline asm. This can be problematic, especially if the function is inlined, since the compiler can reorder instructions in such a way that a different instruction, which may result in a program check, might be executed before the program check new psw has been restored. To avoid such a scenario move restoring into the inline asm. For consistency reasons move also saving of the original program check new psw into the inline asm. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/mem_detect: use register pair instead of register asmHeiko Carstens2021-06-181-15/+19
| | | | | | | ...and slightly cleanup the inline asm. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/mem_detect: fix diag260() program check new psw handlingHeiko Carstens2021-06-181-8/+11
| | | | | | | | | | | | | | | | | | | The __diag260() inline asm temporarily changes the program check new psw to redirect a potential program check on the diag instruction. Restoring of the program check new psw is done in C code behind the inline asm. This can be problematic, especially if the function is inlined, since the compiler can reorder instructions in such a way that a different instruction, which may result in a program check, might be executed before the program check new psw has been restored. To avoid such a scenario move restoring into the inline asm. For consistency reasons move also saving of the original program check new psw into the inline asm. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/ipl_parm: use register pair instead of register asmHeiko Carstens2021-06-181-12/+14
| | | | | | | ...and slightly cleanup the inline asm. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/ipl_parm: fix program check new psw handlingHeiko Carstens2021-06-181-8/+11
| | | | | | | | | | | | | | | | | | | The __diag308() inline asm temporarily changes the program check new psw to redirect a potential program check on the diag instruction. Restoring of the program check new psw is done in C code behind the inline asm. This can be problematic, especially if the function is inlined, since the compiler can reorder instructions in such a way that a different instruction, which may result in a program check, might be executed before the program check new psw has been restored. To avoid such a scenario move restoring into the inline asm. For consistency reasons move also saving of the original program check new psw into the inline asm. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/boot: add zstd supportDimitri John Ledkov2021-06-182-0/+10
| | | | | | | | | | | | | | | | | | Enable ztsd support in s390/boot, to enable booting with zstd compressed kernel when configured with CONFIG_KERNEL_ZSTD=y. BOOT_HEAP_SIZE is defined to 0x30000 in this case. Actual decompressor memory usage with allyesconfig is currently 0x26150. BugLink: https://bugs.launchpad.net/bugs/1931725 Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com> cc: Heiko Carstens <hca@linux.ibm.com> cc: Vasily Gorbik <gor@linux.ibm.com> cc: Christian Borntraeger <borntraeger@de.ibm.com> cc: linux-s390@vger.kernel.org Link: https://lore.kernel.org/r/20210615114150.325080-1-dimitri.ledkov@canonical.com [gor: added BOOT_HEAP_SIZE for zstd] Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/decompressor: correct BOOT_HEAP_SIZE conditionVasily Gorbik2021-06-181-1/+1
| | | | | | | | | | | | | | | | | | Currently BOOT_HEAP_SIZE is always defined as 0x400000 due to bogus condition. Use CONFIG_KERNEL_BZIP2 instead of CONFIG_HAVE_KERNEL_BZIP2 to correct that. BOOT_HEAP_SIZE of 0x10000 is still good enough for every decompressor algorithm but bzip2. Actual decompressor memory usage with allyesconfig is the following: gzip 0xbc28 bzip2 0x379518 xz 0x7410 lzma 0x3e6c lzo 0 lz4 0 Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: setup kernel memory layout earlyVasily Gorbik2021-06-184-4/+118
| | | | | | | | | | | | | | | | | | | | | | Currently there are two separate places where kernel memory layout has to be known and adjusted: 1. early kasan setup. 2. paging setup later. Those 2 places had to be kept in sync and adjusted to reflect peculiar technical details of one another. With additional factors which influence kernel memory layout like ultravisor secure storage limit, complexity of keeping two things in sync grew up even more. Besides that if we look forward towards creating identity mapping and enabling DAT before jumping into uncompressed kernel - that would also require full knowledge of and control over kernel memory layout. So, de-duplicate and move kernel memory layout setup logic into the decompressor. Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/decompressor: replace use of perl with simple sed/trRob Landley2021-06-071-1/+1
| | | | | | | | | | | Use simple sed/tr instead of perl to generate decompressor symbols file with the same result. Signed-off-by: Rob Landley <rob@landley.net> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> [gor: changed commit message] Link: https://lore.kernel.org/r/a48c51f8-5fe4-87e7-284e-c96e2381801a@landley.net Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/boot: access kernel command line via parmareaHeiko Carstens2021-06-071-4/+4
| | | | | | | | | | | | Access the kernel command line via parmarea instead of using the COMMAND_LINE define. With this the following gcc11 warning is removed: arch/s390/boot/ipl_parm.c: In function ‘setup_boot_command_line’: arch/s390/boot/ipl_parm.c:168:50: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=] Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/ipl: make parameter area accessible via struct parmareaHeiko Carstens2021-06-071-0/+3
| | | | | | | | | | | | Since commit 9a965ea95135 ("s390/kexec_file: Simplify parmarea access") we have struct parmarea which describes the layout of the kernel parameter area. Make the kernel parameter area available as global variable parmarea of type struct parmarea, which allows to easily access its members. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/facilities: move stfl information from lowcore to global dataSven Schnelle2021-06-073-6/+9
| | | | | | | | | | With gcc-11, there are a lot of warnings because the facility functions are accessing lowcore through a null pointer. Fix this by moving the facility arrays away from lowcore. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: uv: Fix sysfs max number of VCPUs reportingJanosch Frank2021-01-271-1/+1
| | | | | | | | | | | | | | The number reported by the query is N-1 and I think people reading the sysfs file would expect N instead. For users creating VMs there's no actual difference because KVM's limit is currently below the UV's limit. Signed-off-by: Janosch Frank <frankja@linux.ibm.com> Fixes: a0f60f8431999 ("s390/protvirt: Add sysfs firmware interface for Ultravisor information") Cc: stable@vger.kernel.org Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Acked-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* kasan, x86, s390: update undef CONFIG_KASANAndrey Konovalov2020-12-221-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the intoduction of hardware tag-based KASAN some kernel checks of this kind: ifdef CONFIG_KASAN will be updated to: if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) x86 and s390 use a trick to #undef CONFIG_KASAN for some of the code that isn't linked with KASAN runtime and shouldn't have any KASAN annotations. Also #undef CONFIG_KASAN_GENERIC with CONFIG_KASAN. Link: https://lkml.kernel.org/r/9d84bfaaf8fabe0fc89f913c9e420a30bd31a260.1606161801.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Marco Elver <elver@google.com> Acked-by: Vasily Gorbik <gor@linux.ibm.com> Reviewed-by: Alexander Potapenko <glider@google.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* s390/boot: add build-id to decompressorPhilipp Rudo2020-12-092-1/+2
| | | | | | | | | | | | | | | | More and more functionality from the early boot phase gets carried over to the decompressor. With this the complexity of the code and thus the chance to introduce bugs increases. In order to be able to debug these early boot bugs the distributions have to package the decompressors vmlinux together with the other debuginfos. However for that the distributions require the vmlinux to contain a build-id. Per default the section containing the build-id is placed first in the section table. So make sure to move it behind the .text section otherwise the image would be unbootable. Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/decompressor: print cmdline and BEAR on pgm_checkVasily Gorbik2020-11-201-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add kernel command line and last breaking event. The kernel command line is taken from early_command_line and printed only if kernel is not running as protected virtualization guest and if it has been already initialized from the "COMMAND_LINE". Linux version 5.10.0-rc3-22794-gecaa72788df0-dirty (gor@tuxmaker) #28 SMP PREEMPT Mon Nov 9 17:41:20 CET 2020 Kernel command line: audit_enable=0 audit=0 selinux=0 crashkernel=296M root=/dev/dasda1 dasd=ec5b memblock=debug die Kernel fault: interruption code 0005 ilc:2 PSW : 0000000180000000 0000000000012f92 (parse_boot_command_line+0x27a/0x46c) R:0 T:0 IO:0 EX:0 Key:0 M:0 W:0 P:0 AS:0 CC:0 PM:0 RI:0 EA:3 GPRS: 0000000000000000 00ffffffffffffff 0000000000000000 000000000001a65c 000000000000bf60 0000000000000000 00000000000003c0 0000000000000000 0000000000000080 000000000002322d 000000007f29ef20 0000000000efd018 000000000311c000 0000000000010070 0000000000012f82 000000000000bea8 Call Trace: (sp:000000000000bea8 [<000000000002016e>] 000000000002016e) sp:000000000000bf18 [<0000000000012408>] startup_kernel+0x88/0x2fc sp:000000000000bf60 [<00000000000100c4>] startup_normal+0xb0/0xb0 Last Breaking-Event-Address: [<00000000000135ba>] strcmp+0x22/0x24 Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Viktor Mihajlovski <mihajlov@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/decompressor: add stacktrace supportVasily Gorbik2020-11-203-1/+30
| | | | | | | | | | | | | | | | | | | | | | Decompressor works on a single statically allocated stack. Stacktrace implementation with -mbackchain just takes few lines of code. Linux version 5.10.0-rc3-22793-g0f84a355b776-dirty (gor@tuxmaker) #27 SMP PREEMPT Mon Nov 9 17:30:18 CET 2020 Kernel fault: interruption code 0005 ilc:2 PSW : 0000000180000000 0000000000012f92 (parse_boot_command_line+0x27a/0x46c) R:0 T:0 IO:0 EX:0 Key:0 M:0 W:0 P:0 AS:0 CC:0 PM:0 RI:0 EA:3 GPRS: 0000000000000000 00ffffffffffffff 0000000000000000 000000000001a62c 000000000000bf60 0000000000000000 00000000000003c0 0000000000000000 0000000000000080 000000000002322d 000000007f29ef20 0000000000efd018 000000000311c000 0000000000010070 0000000000012f82 000000000000bea8 Call Trace: (sp:000000000000bea8 [<000000000002016e>] 000000000002016e) sp:000000000000bf18 [<0000000000012408>] startup_kernel+0x88/0x2fc sp:000000000000bf60 [<00000000000100c4>] startup_normal+0xb0/0xb0 Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/decompressor: add symbols supportVasily Gorbik2020-11-204-5/+97
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Information printed by print_pgm_check_info() is crucial for debugging decompressor problems. Printing instruction addresses is better than nothing, but turns further debugging into tedious job of figuring out which function those addresses correspond to. This change adds simplistic symbols resolution support. And adds %pS format specifier support to decompressor_printk(). Decompressor symbols list is extracted and sorted with nm -n -S: ... 0000000000010000 0000000000000014 T startup 0000000000010014 00000000000000b0 t startup_normal 0000000000010180 00000000000000b2 t startup_kdump ... Then functions are filtered and contracted to a form: "10000 14 startup\0""10014 b0 startup_normal\0""10180 b2 startup_kdump\0" ... Which makes it trivial to find beginning of an entry and names are 0 terminated, so could be used as is. Symbols are binary-searched. To get symbols list with final addresses and then get it into the decompressor's image the same trick as for kallsyms is used. Decompressor's vmlinux is linked twice. Symbols are stored in .decompressor.syms section, current size is about 2kb. Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/decompressor: correct some asm symbols annotationsVasily Gorbik2020-11-202-11/+12
| | | | | | | | | | | | | | | | | | | | | Use SYM_CODE_* annotations for asm functions, so that function lengths are recognized correctly. Also currently the most part of startup is marked as startup_kdump. Move misplaced startup_kdump where it belongs. $ nm -n -S arch/s390/boot/compressed/vmlinux Before: 0000000000010000 T startup 0000000000010010 T startup_kdump After: 0000000000010000 0000000000000014 T startup 0000000000010014 00000000000000b0 t startup_normal 0000000000010180 00000000000000b2 t startup_kdump Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/decompressor: add decompressor_printkVasily Gorbik2020-11-202-78/+68
| | | | | | | | | | | | | | | | | | | | | | | | The decompressor does not have any special debug means. Running the kernel under qemu with gdb is helpful but tedious exercise if done repeatedly. It is also not applicable to debugging under LPAR and z/VM. One special thing which stands out is a working sclp_early_printk, which could be used once the kernel switches to 64-bit addressing mode. But sclp_early_printk does not provide any string formating capabilities. Formatting and printing string without printk-alike function is a not fun. The lack of printk-alike function means people would save up on testing and introduce more bugs. So, finally, provide decompressor_printk function, which fits on one screen and trades features for simplicity. It only supports "%s", "%x" and "%lx" specifiers and zero padding for hex values. Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390: unify identity mapping limits handlingVasily Gorbik2020-11-205-46/+73
| | | | | | | | | | | | | | | | | | | | | | | | | Currently we have to consider too many different values which in the end only affect identity mapping size. These are: 1. max_physmem_end - end of physical memory online or standby. Always <= end of the last online memory block (get_mem_detect_end()). 2. CONFIG_MAX_PHYSMEM_BITS - the maximum size of physical memory the kernel is able to support. 3. "mem=" kernel command line option which limits physical memory usage. 4. OLDMEM_BASE which is a kdump memory limit when the kernel is executed as crash kernel. 5. "hsa" size which is a memory limit when the kernel is executed during zfcp/nvme dump. Through out kernel startup and run we juggle all those values at once but that does not bring any amusement, only confusion and complexity. Unify all those values to a single one we should really care, that is our identity mapping size. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/early: rewrite program parameter setup in CVasily Gorbik2020-11-091-0/+10
| | | | | | | | And move it earlier in the decompressor. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/kasan: move memory needs estimation into a functionVasily Gorbik2020-11-091-22/+8
| | | | | | | | Also correct rounding downs in estimation calculations. Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/decompressor: fix build warningVasily Gorbik2020-11-091-1/+3
| | | | | | | | | | | | Fixes the following warning with CONFIG_KERNEL_UNCOMPRESSED=y arch/s390/boot/compressed/decompressor.h:6:46: warning: non-void function does not return a value [-Wreturn-type] static inline void *decompress_kernel(void) {} ^ Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/mm: let vmalloc area size depend on physical memory sizeHeiko Carstens2020-11-093-1/+21
| | | | | | | | | | | | To make sure that the vmalloc area size is for almost all cases large enough let it depend on the (potential) physical memory size. There is still the possibility to override this with the vmalloc kernel command line parameter. Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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