On 11/3/20 8:03 AM, Sven Schnelle wrote: > Hi Jens, > > Jens Axboe <ax...@kernel.dk> writes: > >> On 11/3/20 4:00 AM, Sven Schnelle wrote: >>> Hi Jens, >>> >>> Heiko Carstens <hca () linux ! ibm ! com> writes: >>> >>>> On Thu, Oct 29, 2020 at 10:21:11AM -0600, Jens Axboe wrote: >>>>> Wire up TIF_NOTIFY_SIGNAL handling for s390. >>>>> >>>>> Cc: linux-s...@vger.kernel.org >>>>> Signed-off-by: Jens Axboe <ax...@kernel.dk> >>>>> --- >>>>> >>>>> 5.11 has support queued up for TIF_NOTIFY_SIGNAL, see this posting >>>>> for details: >>>>> >>>>> https://lore.kernel.org/io-uring/20201026203230.386348-1-ax...@kernel.dk/ >>>>> >>>>> As part of that work, I'm adding TIF_NOTIFY_SIGNAL support to all archs, >>>>> as that will enable a set of cleanups once all of them support it. I'm >>>>> happy carrying this patch if need be, or it can be funelled through the >>>>> arch tree. Let me know. >>>>> >>>>> arch/s390/include/asm/thread_info.h | 2 ++ >>>>> arch/s390/kernel/entry.S | 7 ++++++- >>>>> 2 files changed, 8 insertions(+), 1 deletion(-) >>>>> >>>>> diff --git a/arch/s390/include/asm/thread_info.h >>>>> b/arch/s390/include/asm/thread_info.h >>>>> index 13a04fcf7762..0045341ade48 100644 >>>>> --- a/arch/s390/include/asm/thread_info.h >>>>> +++ b/arch/s390/include/asm/thread_info.h >>>>> @@ -65,6 +65,7 @@ void arch_setup_new_exec(void); >>>>> #define TIF_GUARDED_STORAGE 4 /* load guarded storage control >>>>> block */ >>>>> #define TIF_PATCH_PENDING 5 /* pending live patching update >>>>> */ >>>>> #define TIF_PGSTE 6 /* New mm's will use 4K page >>>>> tables */ >>>>> +#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ >>>>> #define TIF_ISOLATE_BP 8 /* Run process with isolated BP >>>>> */ >>>>> #define TIF_ISOLATE_BP_GUEST 9 /* Run KVM guests with isolated >>>>> BP */ >>>>> >>>>> @@ -82,6 +83,7 @@ void arch_setup_new_exec(void); >>>>> #define TIF_SYSCALL_TRACEPOINT 27 /* syscall tracepoint >>>>> instrumentation */ >>>>> >>>>> #define _TIF_NOTIFY_RESUME BIT(TIF_NOTIFY_RESUME) >>>>> +#define _TIF_NOTIFY_SIGNAL BIT(TIF_NOTIFY_SIGNAL) >>>>> #define _TIF_SIGPENDING BIT(TIF_SIGPENDING) >>>>> #define _TIF_NEED_RESCHED BIT(TIF_NEED_RESCHED) >>>>> #define _TIF_UPROBE BIT(TIF_UPROBE) >>>>> diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S >>>>> index 86235919c2d1..a30d891e8045 100644 >>>>> --- a/arch/s390/kernel/entry.S >>>>> +++ b/arch/s390/kernel/entry.S >>>>> @@ -52,7 +52,8 @@ STACK_SIZE = 1 << STACK_SHIFT >>>>> STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE >>>>> >>>>> _TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | >>>>> _TIF_NEED_RESCHED | \ >>>>> - _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING) >>>>> + _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING | \ >>>>> + _TIF_NOTIFY_SIGNAL) >>>>> _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | >>>>> _TIF_SECCOMP | \ >>>>> _TIF_SYSCALL_TRACEPOINT) >>>>> _CIF_WORK = (_CIF_ASCE_PRIMARY | _CIF_ASCE_SECONDARY | _CIF_FPU) >>>>> @@ -463,6 +464,8 @@ ENTRY(system_call) >>>>> #endif >>>>> TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL_RESTART >>>>> jo .Lsysc_syscall_restart >>>>> + TSTMSK __TI_flags(%r12),_TIF_NOTIFY_SIGNAL >>>>> + jo .Lsysc_sigpending >>>>> TSTMSK __TI_flags(%r12),_TIF_SIGPENDING >>>>> jo .Lsysc_sigpending >>>>> TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME >>>>> @@ -857,6 +860,8 @@ ENTRY(io_int_handler) >>>>> #endif >>>>> TSTMSK __TI_flags(%r12),_TIF_SIGPENDING >>>>> jo .Lio_sigpending >>>>> + TSTMSK __TI_flags(%r12),_TIF_NOTIFY_SIGNAL >>>>> + jo .Lio_sigpending >>>>> TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME >>>>> jo .Lio_notify_resume >>>>> TSTMSK __TI_flags(%r12),_TIF_GUARDED_STORAGE >>>> >>>> (full quote so you can make sense of the patch below). >>>> >>>> Please merge the patch below into this one. With that: >>>> >>>> Acked-by: Heiko Carstens <h...@linux.ibm.com> >>>> >>>> diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S >>>> index a30d891e8045..31f16d903ef3 100644 >>>> --- a/arch/s390/kernel/entry.S >>>> +++ b/arch/s390/kernel/entry.S >>>> @@ -464,9 +464,7 @@ ENTRY(system_call) >>>> #endif >>>> TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL_RESTART >>>> jo .Lsysc_syscall_restart >>>> - TSTMSK __TI_flags(%r12),_TIF_NOTIFY_SIGNAL >>>> - jo .Lsysc_sigpending >>>> - TSTMSK __TI_flags(%r12),_TIF_SIGPENDING >>>> + TSTMSK __TI_flags(%r12),(_TIF_SIGPENDING|_TIF_NOTIFY_SIGNAL) >>>> jo .Lsysc_sigpending >>> >>> We need to also change the jo to jnz - in combination with tm, jo means >>> 'jump if all tested bits are set' while jnz means 'jump if at least one >>> bit is set' >> >> Ah thanks, good catch. And you also caught the braino in signal.c, here's >> the end result: >> >> >> commit 0eb7d372d5319970bd15f2dbc18264ea576214d4 >> Author: Jens Axboe <ax...@kernel.dk> >> Date: Fri Oct 9 15:34:12 2020 -0600 >> >> s390: add support for TIF_NOTIFY_SIGNAL >> >> Wire up TIF_NOTIFY_SIGNAL handling for s390. >> >> Cc: linux-s...@vger.kernel.org >> Acked-by: Heiko Carstens <h...@linux.ibm.com> >> Signed-off-by: Jens Axboe <ax...@kernel.dk> >> >> diff --git a/arch/s390/include/asm/thread_info.h >> b/arch/s390/include/asm/thread_info.h >> index 13a04fcf7762..0045341ade48 100644 >> --- a/arch/s390/include/asm/thread_info.h >> +++ b/arch/s390/include/asm/thread_info.h >> @@ -65,6 +65,7 @@ void arch_setup_new_exec(void); >> #define TIF_GUARDED_STORAGE 4 /* load guarded storage control block */ >> #define TIF_PATCH_PENDING 5 /* pending live patching update */ >> #define TIF_PGSTE 6 /* New mm's will use 4K page tables */ >> +#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ >> #define TIF_ISOLATE_BP 8 /* Run process with isolated BP >> */ >> #define TIF_ISOLATE_BP_GUEST 9 /* Run KVM guests with isolated >> BP */ >> >> @@ -82,6 +83,7 @@ void arch_setup_new_exec(void); >> #define TIF_SYSCALL_TRACEPOINT 27 /* syscall tracepoint >> instrumentation */ >> >> #define _TIF_NOTIFY_RESUME BIT(TIF_NOTIFY_RESUME) >> +#define _TIF_NOTIFY_SIGNAL BIT(TIF_NOTIFY_SIGNAL) >> #define _TIF_SIGPENDING BIT(TIF_SIGPENDING) >> #define _TIF_NEED_RESCHED BIT(TIF_NEED_RESCHED) >> #define _TIF_UPROBE BIT(TIF_UPROBE) >> diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S >> index 86235919c2d1..19a89f292290 100644 >> --- a/arch/s390/kernel/entry.S >> +++ b/arch/s390/kernel/entry.S >> @@ -52,7 +52,8 @@ STACK_SIZE = 1 << STACK_SHIFT >> STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE >> >> _TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ >> - _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING) >> + _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING | \ >> + _TIF_NOTIFY_SIGNAL) >> _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ >> _TIF_SYSCALL_TRACEPOINT) >> _CIF_WORK = (_CIF_ASCE_PRIMARY | _CIF_ASCE_SECONDARY | _CIF_FPU) >> @@ -463,8 +464,8 @@ ENTRY(system_call) >> #endif >> TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL_RESTART >> jo .Lsysc_syscall_restart >> - TSTMSK __TI_flags(%r12),_TIF_SIGPENDING >> - jo .Lsysc_sigpending >> + TSTMSK __TI_flags(%r12),(_TIF_SIGPENDING|_TIF_NOTIFY_SIGNAL) >> + jnz .Lsysc_sigpending >> TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME >> jo .Lsysc_notify_resume >> TSTMSK __LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY) >> @@ -855,8 +856,8 @@ ENTRY(io_int_handler) >> TSTMSK __TI_flags(%r12),_TIF_PATCH_PENDING >> jo .Lio_patch_pending >> #endif >> - TSTMSK __TI_flags(%r12),_TIF_SIGPENDING >> - jo .Lio_sigpending >> + TSTMSK __TI_flags(%r12),(_TIF_SIGPENDING|_TIF_NOTIFY_SIGNAL) >> + jnz .Lio_sigpending >> TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME >> jo .Lio_notify_resume >> TSTMSK __TI_flags(%r12),_TIF_GUARDED_STORAGE >> diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c >> index 9e900a8977bd..b27b6c1f058d 100644 >> --- a/arch/s390/kernel/signal.c >> +++ b/arch/s390/kernel/signal.c >> @@ -472,7 +472,7 @@ void do_signal(struct pt_regs *regs) >> current->thread.system_call = >> test_pt_regs_flag(regs, PIF_SYSCALL) ? regs->int_code : 0; >> >> - if (get_signal(&ksig)) { >> + if (test_thread_flag(TIF_SIGPENDING) && get_signal(&ksig)) { >> /* Whee! Actually deliver the signal. */ >> if (current->thread.system_call) { >> regs->int_code = current->thread.system_call; > > Looks good, feel free to add my Acked-by.
Thanks for your help! Added. -- Jens Axboe
