- May 02, 2019
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Martin Schwidefsky authored
Make the call chain more reliable by tagging the ftrace stack entries with the stack pointer that is associated with the return address. Signed-off-by:Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
Rework the dump_trace() stack unwinder interface to support different unwinding algorithms. The new interface looks like this: struct unwind_state state; unwind_for_each_frame(&state, task, regs, start_stack) do_something(state.sp, state.ip, state.reliable); The unwind_bc.c file contains the implementation for the classic back-chain unwinder. One positive side effect of the new code is it now handles ftraced functions gracefully. It prints the real name of the return function instead of 'return_to_handler'. Signed-off-by: -
Martin Schwidefsky authored
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Martin Schwidefsky authored
Change the __EMIT_BUG inline assembly to emit mergeable __bug_table entries with type @progbits and specify the size of each entry. The entry size is encoded sh_entsize field of the section definition, it allows to identify which struct bug_entry to use to decode the entries. This will be needed for the objtool support. Signed-off-by: -
Martin Schwidefsky authored
The text_dma.S code uses its own macro to generate an inline version of an expoline. To make it easier to identify all expolines in the kernel use a thunk and a branch to the thunk just like the rest of the kernel code does it. The name of the text_dma.S expoline thunk is __dma__s390_indirect_jump_r14 and the section is named .dma.text.__s390_indirect_jump_r14. This will be needed for the objtool support. Signed-off-by: -
Martin Schwidefsky authored
The assembler version of the expoline thunk use the naming __s390x_indirect_jump_rxuse_ry while the compiler generates names like __s390_indirect_jump_rx_use_ry. Make the naming more consistent. Signed-off-by: -
Martin Schwidefsky authored
The assembler code in arch/s390 misses proper ENDPROC statements to properly end functions in a few places. Add them. Signed-off-by:
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- Apr 29, 2019
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Gerald Schaefer authored
The following warning occurred on s390: WARNING: CPU: 0 PID: 804 at kernel/locking/lockdep.c:1025 lockdep_register_key+0x30/0x150 This is because the check in static_obj() assumes that all memory within [_stext, _end] belongs to static objects, which at least for s390 isn't true. The init section is also part of this range, and freeing it allows the buddy allocator to allocate memory from it. We have virt == phys for the kernel on s390, so that such allocations would then have addresses within the range [_stext, _end]. To fix this, introduce arch_is_kernel_initmem_freed(), similar to arch_is_kernel_text/data(), and add it to the checks in static_obj(). This will always return 0 on architectures that do not define arch_is_kernel_initmem_freed. On s390, it will return 1 if initmem has been freed and the address is in the range [__init_begin, __init_end]. Signed-off-by:
Gerald Schaefer <gerald.schaefer@de.ibm.com> Reviewed-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Gerald Schaefer authored
This patch adds support for relocating the kernel to a random address. The random kernel offset is obtained from cpacf, using either TRNG, PRNO, or KMC_PRNG, depending on supported MSA level. KERNELOFFSET is added to vmcoreinfo, for crash --kaslr support. Signed-off-by:
Philipp Rudo <prudo@linux.ibm.com> Signed-off-by:
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Gerald Schaefer authored
With a relocatable kernel that could reside at any place in memory, code and data that has to stay below 2 GB needs special handling. This patch introduces .dma sections for such text, data and ex_table. The sections will be part of the decompressor kernel, so they will not be relocated and stay below 2 GB. Their location is passed over to the decompressed / relocated kernel via the .boot.preserved.data section. The duald and aste for control register setup also need to stay below 2 GB, so move the setup code from arch/s390/kernel/head64.S to arch/s390/boot/head.S. The duct and linkage_stack could reside above 2 GB, but their content has to be preserved for the decompresed kernel, so they are also moved into the .dma section. The start and end address of the .dma sections is added to vmcoreinfo, for crash support, to help debugging in case the kernel crashed there. Signed-off-by:
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Gerald Schaefer authored
The sccbs for init/read/sdias/early have to be located below 2 GB, and they are currently defined as a static buffer. With a relocatable kernel that could reside at any place in memory, this will no longer guarantee the location below 2 GB, so use a dynamic GFP_DMA allocation instead. The sclp_early_sccb buffer needs special handling, as it can be used very early, and by both the decompressor and also the decompressed kernel. Therefore, a fixed 4 KB buffer is introduced at 0x11000, the former PARMAREA_END. The new PARMAREA_END is now 0x12000, and it is renamed to HEAD_END, as it is rather the end of head.S and not the end of the parmarea. Signed-off-by:
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Gerald Schaefer authored
With a relocatable kernel that could reside at any place in memory, the current logic for allocating a kprobes insn_page does not work. The GFP_DMA allocated buffer might be more than 2 GB away from the kernel. Use a static buffer for the insn_page instead. Signed-off-by:
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Gerald Schaefer authored
With a relocatable kernel that could reside at any place in memory, the storage size for the SYSCALL and PGM_CHECK handlers needs to be increased from .long to .quad. Signed-off-by:
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Gerald Schaefer authored
This patch adds support for building a relocatable kernel with -fPIE. The kernel will be relocated to 0 early in the boot process. Signed-off-by:
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Sebastian Ott authored
Allow for userspace to use PCI MIO instructions. Signed-off-by:
Sebastian Ott <sebott@linux.ibm.com> Signed-off-by:
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Sebastian Ott authored
Allow users to disable usage of MIO instructions by specifying pci=nomio at the kernel command line. Signed-off-by:
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Sebastian Ott authored
Provide support for PCI I/O instructions that work on mapped IO addresses. Signed-off-by:
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Sebastian Ott authored
ISM devices are special in how they access PCI memory space. Provide wrappers for handling commands to the device. No functional change. Signed-off-by:
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Sebastian Ott authored
This is a preparation patch for usage of new pci instructions. No functional change. Signed-off-by:
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Sebastian Ott authored
Provide a kernel parameter to force the usage of floating interrupts. Signed-off-by:
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Sebastian Ott authored
Gather statistics to distinguish floating and directed interrupts. Signed-off-by:
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Sebastian Ott authored
Improve /proc/interrupts on s390 to show statistics for individual MSI interrupts. Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Acked-by:
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Sebastian Ott authored
Up until now all interrupts on s390 have been floating. For MSI interrupts we've used a global summary bit vector (with a bit for each function) and a per-function interrupt bit vector (with a bit per MSI). This patch introduces a new IRQ delivery mode: CPU directed interrupts. In this new mode a per-CPU interrupt bit vector is used (with a bit per MSI per function). Further it is now possible to direct an IRQ to a specific CPU so we can finally support IRQ affinity. If an interrupt can't be delivered because the appointed CPU is occupied by a hypervisor the interrupt is delivered floating. For this a global summary bit vector is used (with a bit per CPU). Signed-off-by:
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Sebastian Ott authored
Provide the ability to create cachesize aligned interrupt vectors. These will be used for per-CPU interrupt vectors. Signed-off-by:
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Sebastian Ott authored
Rename and clarify the usage of the interrupt bit vectors. Also change the array of the per-function bit vectors to be dynamically allocated. Signed-off-by:
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Sebastian Ott authored
Add an extra parameter for airq handlers to recognize floating vs. directed interrupts. Signed-off-by:
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Sebastian Ott authored
Detect the adapter CPU directed interruption facility. Signed-off-by:
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Sebastian Ott authored
Move everything interrupt related from pci.c to pci_irq.c. No functional change. Signed-off-by:
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Sebastian Ott authored
No users of pr_debug in that file. Signed-off-by:
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Sebastian Ott authored
No point to keep that around. Signed-off-by:
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Philipp Rudo authored
Provide an interface for userspace so it can find out if a machine is capeable of doing secure boot. The interface is, for example, needed for zipl so it can find out which file format it can/should write to disk. Signed-off-by:
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Philipp Rudo authored
A kernel loaded via kexec_load cannot be verified. Thus disable kexec_load systemcall in kernels which where IPLed securely. Use the IMA mechanism to do so. Signed-off-by:
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Philipp Rudo authored
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Philipp Rudo authored
Add kernel signature verification to kexec_file. The verification is based on module signature verification and works with kernel images signed via scripts/sign-file. Signed-off-by:
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Philipp Rudo authored
The leading 64 kB of a kernel image doesn't contain any data needed to boot the new kernel when it was loaded via kexec_file. Thus kexec_file currently strips them off before loading the image. Keep the leading 64 kB in order to be able to pass a ipl_report to the next kernel. Signed-off-by:
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Philipp Rudo authored
s390_image_load and s390_elf_load have the same code to load the different components. Combine this functionality in one shared function. While at it move kexec_file_update_kernel into the new function as well. Signed-off-by:
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Philipp Rudo authored
Access the parmarea in head.S via a struct instead of individual offsets. While at it make the fields in the parmarea .quads. Signed-off-by:
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Philipp Rudo authored
Omit use of script/bin2c hack. Directly include into assembler file instead. Signed-off-by:
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Philipp Rudo authored
The purgatory is compiled into the vmlinux and keept in memory all the time during runtime. Thus any section not needed to load the purgatory unnecessarily bloats up its foot print in file- and memorysize. Reduce the purgatory size by stripping the unneeded sections from the purgatory. This reduces the purgatories size by ~33%. Signed-off-by:
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Philipp Rudo authored
To register data for the next kernel (command line, oldmem_base, etc.) the current kernel needs to find the ELF segment that contains head.S. This is currently done by checking ifor 'phdr->p_paddr == 0'. This works fine for the current kernel build but in theory the first few pages could be skipped. Make the detection more robust by checking if the entry point lies within the segment. Signed-off-by:
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