linux.git/arch/s390/include, branch vm-bind

mmu_gather: Remove per arch tlb_{start,end}_vma()

2022-07-21T17:50:13+00:00

Scattered across the archs are 3 basic forms of tlb_{start,end}_vma(). Provide two new MMU_GATHER_knobs to enumerate them and remove the per arch tlb_{start,end}_vma() implementations. - MMU_GATHER_NO_FLUSH_CACHE indicates the arch has flush_cache_range() but does *NOT* want to call it for each VMA. - MMU_GATHER_MERGE_VMAS indicates the arch wants to merge the invalidate across multiple VMAs if possible. With these it is possible to capture the three forms: 1) empty stubs; select MMU_GATHER_NO_FLUSH_CACHE and MMU_GATHER_MERGE_VMAS 2) start: flush_cache_range(), end: empty; select MMU_GATHER_MERGE_VMAS 3) start: flush_cache_range(), end: flush_tlb_range(); default Obviously, if the architecture does not have flush_cache_range() then it also doesn't need to select MMU_GATHER_NO_FLUSH_CACHE. Signed-off-by: Peter Zijlstra (Intel) Acked-by: Will Deacon Cc: David Miller Signed-off-by: Linus Torvalds

s390/nospec: remove unneeded header includes

2022-07-13T13:21:55+00:00

Commit 4efd417f298b ("s390: raise minimum supported machine generation to z10") removed the usage of alternatives and lowcore in expolines macros. Remove unneeded header includes as well. With that, expoline.S doesn't require asm-offsets.h and expoline_prepare target dependency could be removed. Tested-by: Joe Lawrence Link: https://lore.kernel.org/r/patch-2.thread-d13b6c.git-d13b6c96fb5f.your-ad-here.call-01656331067-ext-4899@work.hours Signed-off-by: Vasily Gorbik Signed-off-by: Alexander Gordeev

s390/qdio: Fix spelling mistake

2022-06-30T17:40:36+00:00

Change 'defineable' to 'definable'. Change 'paramater' to 'parameter'. Signed-off-by: Zhang Jiaming Reviewed-by: Benjamin Block Link: https://lore.kernel.org/r/20220623060543.12870-1-jiaming@nfschina.com Signed-off-by: Alexander Gordeev

s390/archrandom: simplify back to earlier design and initialize earlier

2022-06-30T17:40:36+00:00

s390x appears to present two RNG interfaces: - a "TRNG" that gathers entropy using some hardware function; and - a "DRBG" that takes in a seed and expands it. Previously, the TRNG was wired up to arch_get_random_{long,int}(), but it was observed that this was being called really frequently, resulting in high overhead. So it was changed to be wired up to arch_get_random_ seed_{long,int}(), which was a reasonable decision. Later on, the DRBG was then wired up to arch_get_random_{long,int}(), with a complicated buffer filling thread, to control overhead and rate. Fortunately, none of the performance issues matter much now. The RNG always attempts to use arch_get_random_seed_{long,int}() first, which means a complicated implementation of arch_get_random_{long,int}() isn't really valuable or useful to have around. And it's only used when reseeding, which means it won't hit the high throughput complications that were faced before. So this commit returns to an earlier design of just calling the TRNG in arch_get_random_seed_{long,int}(), and returning false in arch_get_ random_{long,int}(). Part of what makes the simplification possible is that the RNG now seeds itself using the TRNG at bootup. But this only works if the TRNG is detected early in boot, before random_init() is called. So this commit also causes that check to happen in setup_arch(). Cc: stable@vger.kernel.org Cc: Harald Freudenberger Cc: Ingo Franzki Cc: Juergen Christ Cc: Heiko Carstens Signed-off-by: Jason A. Donenfeld Link: https://lore.kernel.org/r/20220610222023.378448-1-Jason@zx2c4.com Reviewed-by: Harald Freudenberger Acked-by: Heiko Carstens Signed-off-by: Alexander Gordeev

Merge tag 's390-5.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2022-06-03T20:57:50+00:00

Pull more s390 updates from Heiko Carstens: "Just a couple of small improvements, bug fixes and cleanups: - Add Eric Farman as maintainer for s390 virtio drivers. - Improve machine check handling, and avoid incorrectly injecting a machine check into a kvm guest. - Add cond_resched() call to gmap page table walker in order to avoid possible huge latencies. Also use non-quiesing sske instruction to speed up storage key handling. - Add __GFP_NORETRY to KEXEC_CONTROL_MEMORY_GFP so s390 behaves similar like common code. - Get sie control block address from correct stack slot in perf event code. This fixes potential random memory accesses. - Change uaccess code so that the exception handler sets the result of get_user() and __get_kernel_nofault() to zero in case of a fault. Until now this was done via input parameters for inline assemblies. Doing it via fault handling is what most or even all other architectures are doing. - Couple of other small cleanups and fixes" * tag 's390-5.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/stack: add union to reflect kvm stack slot usages s390/stack: merge empty stack frame slots s390/uaccess: whitespace cleanup s390/uaccess: use __noreturn instead of __attribute__((noreturn)) s390/uaccess: use exception handler to zero result on get_user() failure s390/uaccess: use symbolic names for inline assembler operands s390/mcck: isolate SIE instruction when setting CIF_MCCK_GUEST flag s390/mm: use non-quiescing sske for KVM switch to keyed guest s390/gmap: voluntarily schedule during key setting MAINTAINERS: Update s390 virtio-ccw s390/kexec: add __GFP_NORETRY to KEXEC_CONTROL_MEMORY_GFP s390/Kconfig.debug: fix indentation s390/Kconfig: fix indentation s390/perf: obtain sie_block from the right address s390: generate register offsets into pt_regs automatically s390: simplify early program check handler s390/crypto: fix scatterwalk_unmap() callers in AES-GCM

Merge tag 'livepatching-for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

2022-06-02T15:55:01+00:00

Pull livepatching cleanup from Petr Mladek: - Remove duplicated livepatch code [Christophe] * tag 'livepatching-for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching: livepatch: Remove klp_arch_set_pc() and asm/livepatch.h

s390/stack: add union to reflect kvm stack slot usages

2022-06-01T10:03:17+00:00

Add a union which describes how the empty stack slots are being used by kvm and perf. This should help to avoid another bug like the one which was fixed with commit c9bfb460c3e4 ("s390/perf: obtain sie_block from the right address"). Reviewed-by: Nico Boehr Tested-by: Nico Boehr Signed-off-by: Heiko Carstens

s390/stack: merge empty stack frame slots

2022-06-01T10:03:17+00:00

Merge empty1 and empty2 arrays within the stack frame to one single array. This is possible since with commit 42b01a553a56 ("s390: always use the packed stack layout") the alternative stack frame layout is gone. Reviewed-by: Nico Boehr Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens

s390/uaccess: whitespace cleanup

2022-06-01T10:03:17+00:00

Whitespace cleanup to get rid if some checkpatch findings, but mainly to have consistent coding style within the header file again. Signed-off-by: Heiko Carstens

s390/uaccess: use noreturn instead of attribute__((noreturn))

2022-06-01T10:03:17+00:00

Signed-off-by: Heiko Carstens