- 09 Feb, 2023 2 commits
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Heiko Carstens authored
There is no reason to do idle time accounting in arch_cpu_idle(). Do idle time accounting in account_idle_time_irq(), where it belongs to. The accounted values don't change between account_idle_time_irq() and arch_cpu_idle(); so the result is the same. Reviewed-by:
Sven Schnelle <svens@linux.ibm.com> Signed-off-by:
Heiko Carstens <hca@linux.ibm.com>
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Heiko Carstens authored
Signed-off-by:
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- 06 Feb, 2023 23 commits
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Alexander Egorenkov authored
Change naming of the internal diag288 helper functions to improve overall readability and reduce confusion: * Rename __diag288() to diag288(). * Get rid of the misnamed helper __diag288_lpar() that was used not only on LPARs but also zVM and KVM systems. * Rename __diag288_vm() to diag288_str(). Reviewed-by:
Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by:
Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20230203073958.1585738-6-egorenar@linux.ibm.comSigned-off-by:
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Alexander Egorenkov authored
Call diag_stat_inc() from __diag288() to reduce code duplication. Reviewed-by:
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Alexander Egorenkov authored
Simplify and de-duplicate code by introducing a common single command buffer allocated once at initialization. Moreover, simplify the interface of __diag288_vm() by accepting ASCII strings as the command parameter and converting it to the EBCDIC format within the function itself. Reviewed-by:
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Alexander Egorenkov authored
Remove power management because s390 no longer supports hibernation since commit 39421627 ("s390: remove broken hibernate / power management support"). Reviewed-by:
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Alexander Egorenkov authored
Using register asm statements has been proven to be very error prone, especially when using code instrumentation where gcc may add function calls, which clobbers register contents in an unexpected way. Therefore, get rid of register asm statements in watchdog code, and make sure this bug class cannot happen. Moreover, remove the register r1 from the clobber list because this register is not changed by DIAG 288. Reviewed-by:
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Heiko Carstens authored
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Vasily Gorbik authored
Fixes: bb1520d5 ("s390/mm: start kernel with DAT enabled") Reviewed-by:
Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by:
Vasily Gorbik <gor@linux.ibm.com> Signed-off-by:
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Vasily Gorbik authored
Facilities setup has to be done after "facilities" command line option parsing, it might set extra or remove existing facilities bits for testing purposes. Fixes: bb1520d5 ("s390/mm: start kernel with DAT enabled") Reviewed-by:
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Vasily Gorbik authored
KASAN common code is able to handle memory hotplug and create KASAN shadow memory on a fly. Online memory ranges are available from mem_detect, use this information to avoid mapping KASAN shadow for standby memory. Reviewed-by:
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Vasily Gorbik authored
If kernel is build without KASAN support there is a chance that kernel image is going to be positioned by KASLR code to overlap with identity mapping page tables. When kernel is build with KASAN support enabled memory which is potentially going to be used for page tables and KASAN shadow mapping is accounted for in KASLR with the use of kasan_estimate_memory_needs(). Split this function and introduce vmem_estimate_memory_needs() to cover decompressor's vmem identity mapping page tables. Fixes: bb1520d5 ("s390/mm: start kernel with DAT enabled") Reviewed-by:
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Vasily Gorbik authored
Add a function to get online memory in total. It is supposed to be used in the decompressor as well as during early kernel startup. Reviewed-by:
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Vasily Gorbik authored
Introduce mem_detect_truncate() to cut any online memory ranges above established identity mapping size, so that mem_detect users wouldn't have to do it over and over again. Suggested-by:
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Vasily Gorbik authored
Allocation of mem_detect extended area was not considered neither in commit 9641b8cc ("s390/ipl: read IPL report at early boot") nor in commit b2d24b97 ("s390/kernel: add support for kernel address space layout randomization (KASLR)"). As a result mem_detect extended theoretically may overlap with ipl report or randomized kernel image position. But as mem_detect code will allocate extended area only upon exceeding 255 online regions (which should alternate with offline memory regions) it is not seen in practice. To make sure mem_detect extended area does not overlap with ipl report or randomized kernel position extend usage of "safe_addr". Make initrd handling and mem_detect extended area allocation code move it further right and make KASLR takes in into consideration as well. Fixes: 9641b8cc ("s390/ipl: read IPL report at early boot") Fixes: b2d24b97 ("s390/kernel: add support for kernel address space layout randomization (KASLR)") Reviewed-by:
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Vasily Gorbik authored
In case sclp_early_get_memsize() fails but diag260() succeeds make sure some sane value is returned. This error scenario is highly unlikely, but this change makes system able to boot in such case. Suggested-by:
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Heiko Carstens authored
Get rid of this sparse warning: arch/s390/kernel/diag.c:69:29: warning: symbol '__diag8c_tmp_amode31' was not declared. Should it be static? Fixes: fbaee746 ("s390/tty3270: add support for diag 8c") Signed-off-by:
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Heiko Carstens authored
Compiling the kernel with CONFIG_KPROBES disabled, but CONFIG_RETHOOK enabled, results in this sparse warning: arch/s390/kernel/rethook.c:26:15: warning: no previous prototype for 'arch_rethook_trampoline_callback' [-Wmissing-prototypes] 26 | unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add a local rethook header file similar to riscv to address this. Reported-by:kernel test robot <lkp@intel.com> Fixes: 1a280f48 ("s390/kprobes: replace kretprobe with rethook") Link: https://lore.kernel.org/all/202302030102.69dZIuJk-lkp@intel.comSigned-off-by:
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Vasily Gorbik authored
Kasan shadow memory area has been moved to the end of kernel address space since commit 9a39abb7 ("s390/boot: simplify and fix kernel memory layout setup"), therefore skipping any memory ranges above VMALLOC_START in empty page tables cleanup code already handles KASAN shadow memory intersection case and explicit checks could be removed. Reviewed-by:
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Vasily Gorbik authored
Commit b9ff8100 ("s390/vmem: cleanup empty page tables") introduced empty page tables cleanup in vmem code, but when the kernel is built with KASAN enabled the code has no effect due to wrong KASAN shadow memory intersection condition, which effectively ignores any memory range below KASAN shadow. Fix intersection condition to make code work as anticipated. Fixes: b9ff8100 ("s390/vmem: cleanup empty page tables") Reviewed-by:
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Vasily Gorbik authored
Kasan shadow memory area has been moved to the end of kernel address space since commit 9a39abb7 ("s390/boot: simplify and fix kernel memory layout setup"). Change kasan memory layout note accordingly. Reviewed-by:
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Vasily Gorbik authored
Currently if for some reason sclp_early_read_info() fails, sclp_early_get_memsize() will not set max_physmem_end and it will stay uninitialized. Any garbage value other than 0 will lead to detect_memory() taking wrong path or returning a garbage value as max_physmem_end. To avoid that simply initialize max_physmem_end. Fixes: 73045a08 ("s390: unify identity mapping limits handling") Reported-by:
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Heiko Carstens authored
Given that strlcpy() is deprecated use strscpy() instead. Signed-off-by: -
Sven Schnelle authored
commit 87fd22e0 ("s390/ipl: add eckd support") missed to add the loadparm attribute to the new eckd ipl/reipl data. Fixes: 87fd22e0 ("s390/ipl: add eckd support") Cc: <stable@vger.kernel.org> Signed-off-by:
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Sven Schnelle authored
In the current code each reipl type implements its own pair of loadparm show/store functions. Add a macro to deduplicate the code a bit. Reviewed-by:
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- 31 Jan, 2023 6 commits
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Alexander Gordeev authored
Function __get_mem_detect_block() resets start and end output parameters in case of invalid mem_detect array index is provided. That violates the rule of sparing the output on fail path and leads e.g to a below anomaly: for_each_mem_detect_block(i, &start, &end) continue; One would expect start and end contain addresses of the last memory block (if available), but in fact the two will be reset to zeroes. That is not how an iterator is expected to work. Reviewed-by:
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Vineeth Vijayan authored
Unbinding an I/O subchannel with a child-CCW device in disconnected state sometimes causes a kernel-panic. The race condition was seen mostly during testing, when setting all the CHPIDs of a device to offline and at the same time, the unbinding the I/O subchannel driver. The kernel-panic occurs because of double delete, the I/O subchannel driver calls device_del on the CCW device while another device_del invocation for the same device is in-flight. For instance, disabling all the CHPIDs will trigger the ccw_device_remove function, which will call a ccw_device_unregister(), which ends up calling the device_del() which is asynchronous via cdev's todo workqueue. And unbinding the I/O subchannel driver calls io_subchannel_remove() function which calls the ccw_device_unregister() and device_del(). This double delete can be prevented by serializing all CCW device registration/unregistration calls into the driver core. This patch introduces a mutex which will be used for this purpose. Signed-off-by:
Vineeth Vijayan <vneethv@linux.ibm.com> Reported-by:
Boris Fiuczynski <fiuczy@linux.ibm.com> Reviewed-by:
Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by:
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Vasily Gorbik authored
---[ Real Memory Copy Area Start ]--- 0x001bfffffffff000-0x001c000000000000 4K PTE I ---[ Kasan Shadow Start ]--- ---[ Real Memory Copy Area End ]--- 0x001c000000000000-0x001c000200000000 8G PMD RW NX ... ---[ Kasan Shadow End ]--- ptdump does a stable sort of markers. Move kasan markers after memcpy real to avoid swapping. Reviewed-by:
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Vasily Gorbik authored
setup_vmem() already calls populate for all online memory regions. pgtable_populate_end() could be removed. Also rename pgtable_populate_begin() to pgtable_populate_init(). Reviewed-by:
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Vasily Gorbik authored
Commit bb1520d5 ("s390/mm: start kernel with DAT enabled") doesn't consider online memory holes due to potential memory offlining and erroneously creates pgtables for stand-by memory, which bear RW+X attribute and trigger a warning: RANGE SIZE STATE REMOVABLE BLOCK 0x0000000000000000-0x0000000c3fffffff 49G online yes 0-48 0x0000000c40000000-0x0000000c7fffffff 1G offline 49 0x0000000c80000000-0x0000000fffffffff 14G online yes 50-63 0x0000001000000000-0x00000013ffffffff 16G offline 64-79 s390/mm: Found insecure W+X mapping at address 0xc40000000 WARNING: CPU: 14 PID: 1 at arch/s390/mm/dump_pagetables.c:142 note_page+0x2cc/0x2d8 Map only online memory ranges which fit within identity mapping limit. Fixes: bb1520d5 ("s390/mm: start kernel with DAT enabled") Reviewed-by:
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Vasily Gorbik authored
Historically calls to __decompress() didn't specify "out_len" parameter on many architectures including s390, expecting that no writes beyond uncompressed kernel image are performed. This has changed since commit 2aa14b1a ("zstd: import usptream v1.5.2") which includes zstd library commit 6a7ede3dfccb ("Reduce size of dctx by reutilizing dst buffer (#2751)"). Now zstd decompression code might store literal buffer in the unwritten portion of the destination buffer. Since "out_len" is not set, it is considered to be unlimited and hence free to use for optimization needs. On s390 this might corrupt initrd or ipl report which are often placed right after the decompressor buffer. Luckily the size of uncompressed kernel image is already known to the decompressor, so to avoid the problem simply specify it in the "out_len" parameter. Link: https://github.com/facebook/zstd/commit/6a7ede3dfccbSigned-off-by:
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- 30 Jan, 2023 2 commits
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Alexander Egorenkov authored
The DIAG 288 statement consumes an EBCDIC string the address of which is passed in a register. Use a "memory" clobber to tell the compiler that memory is accessed within the inline assembly. Signed-off-by:
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Alexander Egorenkov authored
With CONFIG_VMAP_STACK=y the stack is allocated from the vmalloc space. Data passed to a hardware or a hypervisor interface that requires V=R can no longer be allocated on the stack. Use kmalloc() to get memory for a diag288 command. Signed-off-by:
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- 25 Jan, 2023 7 commits
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Heiko Carstens authored
bpftrace and friends only consider functions present in /sys/kernel/tracing/available_filter_functions. For system calls there is the s390 specific problem that the system call function itself is present via __se_sys##name() while the system call itself is wired up via an __s390x_sys##name() alias. The required DWARF debug information however is only available for the original function, not the alias, but within available_filter_functions only the functions with __s390x_ prefix are available. Which means the required DWARF debug information cannot be found. While this could be solved via tooling, it is easier to change the s390 specific system call wrapper handling. Therefore get rid of this alias handling and implement system call wrappers like most other architectures are doing. In result the implementation generates the following functions: long __s390x_sys##name(struct pt_regs *regs) static inline long __se_sys##name(...) static inline long __do_sys##name(...) __s390x_sys##name() is the visible system call function which is also wired up in the system call table. Its only parameter is a pt_regs variable. This function calls the corresponding __se_sys##name() function, which has as many parameters like the system call definition. This function in turn performs all zero and sign extensions of all system call parameters, taken from the pt_regs structure, and finally calls __do_sys##name(). __do_sys##name() is the actual inlined system call function implementation. For all 64 bit system calls there is a 31/32 bit system call function __s390_sys##name() generated, which handles all system call parameters correctly as required by compat handling. This function may be wired up within the compat system call table, unless there exists an explicit compat system call function, which is then used instead. Reported-by:
Ilya Leoshkevich <iii@linux.ibm.com> Tested-by:
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Heiko Carstens authored
Reviewed-by:
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Heiko Carstens authored
Move __S390_SYS_STUBx() the end of the CONFIG_COMPAT section, so both variants (compat and non-compat) are close together and can be easily compared. Reviewed-by:
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Heiko Carstens authored
Remove __SC_COMPAT_TYPE define which is an unused leftover. Reviewed-by:
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Heiko Carstens authored
SYSCALL_METADATA() is only supposed to be used for non-compat system calls. Otherwise there would be a name clash. This also removes the inconsistency that s390 is the only architecture which uses SYSCALL_METADATA() for compat system calls, and even that only for compat system calls without parameters. Only two such compat system calls exist. Reviewed-by:
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Ilya Leoshkevich authored
When debugging vmlinux with QEMU + GDB, the following GDB error may occur: (gdb) c Continuing. Warning: Cannot insert breakpoint -1. Cannot access memory at address 0xffffffffffff95c0 Command aborted. (gdb) The reason is that, when .interp section is present, GDB tries to locate the file specified in it in memory and put a number of breakpoints there (see enable_break() function in gdb/solib-svr4.c). Sometimes GDB finds a bogus location that matches its heuristics, fails to set a breakpoint and stops. This makes further debugging impossible. The .interp section contains misleading information anyway (vmlinux does not need ld.so), so fix by discarding it. Signed-off-by: -
Thomas Richter authored
Simplify the use of constants PMC_INIT and PMC_RELEASE. Suggested-by:
Thomas Richter <tmricht@linux.ibm.com> Signed-off-by:
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