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: [email protected]
>> Signed-off-by: Jens Axboe <[email protected]>
>> ---
>>
>> 5.11 has support queued up for TIF_NOTIFY_SIGNAL, see this posting
>> for details:
>>
>> https://lore.kernel.org/io-uring/[email protected]/
>>
>> 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 <[email protected]>
>
> 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'
> TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME
> jo .Lsysc_notify_resume
> @@ -858,9 +856,7 @@ 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_NOTIFY_SIGNAL
> + TSTMSK __TI_flags(%r12),(_TIF_SIGPENDING|_TIF_NOTIFY_SIGNAL)
Same here.
> jo .Lio_sigpending
> TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME
> jo .Lio_notify_resume
PS: I didn't get the previous emails, so i replied to a raw download
from marc.info. Not sure whether Threading will work out.
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: [email protected]
>>> Signed-off-by: Jens Axboe <[email protected]>
>>> ---
>>>
>>> 5.11 has support queued up for TIF_NOTIFY_SIGNAL, see this posting
>>> for details:
>>>
>>> https://lore.kernel.org/io-uring/[email protected]/
>>>
>>> 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 <[email protected]>
>>
>> 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 <[email protected]>
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: [email protected]
Acked-by: Heiko Carstens <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
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;
--
Jens Axboe
Hi Jens,
Jens Axboe <[email protected]> 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: [email protected]
>>>> Signed-off-by: Jens Axboe <[email protected]>
>>>> ---
>>>>
>>>> 5.11 has support queued up for TIF_NOTIFY_SIGNAL, see this posting
>>>> for details:
>>>>
>>>> https://lore.kernel.org/io-uring/[email protected]/
>>>>
>>>> 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 <[email protected]>
>>>
>>> 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 <[email protected]>
> 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: [email protected]
> Acked-by: Heiko Carstens <[email protected]>
> Signed-off-by: Jens Axboe <[email protected]>
>
> 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
Sven
On 11/3/20 8:03 AM, Sven Schnelle wrote:
> Hi Jens,
>
> Jens Axboe <[email protected]> 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: [email protected]
>>>>> Signed-off-by: Jens Axboe <[email protected]>
>>>>> ---
>>>>>
>>>>> 5.11 has support queued up for TIF_NOTIFY_SIGNAL, see this posting
>>>>> for details:
>>>>>
>>>>> https://lore.kernel.org/io-uring/[email protected]/
>>>>>
>>>>> 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 <[email protected]>
>>>>
>>>> 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 <[email protected]>
>> 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: [email protected]
>> Acked-by: Heiko Carstens <[email protected]>
>> Signed-off-by: Jens Axboe <[email protected]>
>>
>> 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