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Re: [Qemu-devel] [PATCH v3 06/11] tcg: Introduce tb_mark_invalid() and t
From: |
Sergey Fedorov |
Subject: |
Re: [Qemu-devel] [PATCH v3 06/11] tcg: Introduce tb_mark_invalid() and tb_is_invalid() |
Date: |
Thu, 14 Jul 2016 16:00:42 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 |
On 14/07/16 15:53, Alex Bennée wrote:
> Sergey Fedorov <address@hidden> writes:
>
>> From: Sergey Fedorov <address@hidden>
>>
>> These functions will be used to make translation block invalidation safe
>> with concurrent lockless lookup in the global hash table.
>>
>> Most targets don't use 'cs_base'; so marking TB as invalid is as simple
>> as assigning -1 to 'cs_base'. SPARC target stores the next program
>> counter into 'cs_base', and -1 is a fine invalid value since PC must bet
>> a multiple of 4 in SPARC. The only odd target is i386, for which a
>> special flag is introduced in place of removed 'HF_SOFTMMU_MASK'.
>>
>> Suggested-by: Paolo Bonzini <address@hidden>
>> Signed-off-by: Sergey Fedorov <address@hidden>
>> Signed-off-by: Sergey Fedorov <address@hidden>
>> ---
>> include/exec/exec-all.h | 10 ++++++++++
>> target-alpha/cpu.h | 14 ++++++++++++++
>> target-arm/cpu.h | 14 ++++++++++++++
>> target-cris/cpu.h | 14 ++++++++++++++
>> target-i386/cpu.h | 17 +++++++++++++++++
>> target-lm32/cpu.h | 14 ++++++++++++++
>> target-m68k/cpu.h | 14 ++++++++++++++
>> target-microblaze/cpu.h | 14 ++++++++++++++
>> target-mips/cpu.h | 14 ++++++++++++++
>> target-moxie/cpu.h | 14 ++++++++++++++
>> target-openrisc/cpu.h | 14 ++++++++++++++
>> target-ppc/cpu.h | 14 ++++++++++++++
>> target-s390x/cpu.h | 14 ++++++++++++++
>> target-sh4/cpu.h | 14 ++++++++++++++
>> target-sparc/cpu.h | 14 ++++++++++++++
>> target-sparc/translate.c | 1 +
>> target-tilegx/cpu.h | 14 ++++++++++++++
>> target-tricore/cpu.h | 14 ++++++++++++++
>> target-unicore32/cpu.h | 14 ++++++++++++++
>> target-xtensa/cpu.h | 14 ++++++++++++++
>> 20 files changed, 266 insertions(+)
>>
>> diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
>> index db79ab65cebe..61cc3a1fb8f7 100644
>> --- a/include/exec/exec-all.h
>> +++ b/include/exec/exec-all.h
>> @@ -256,6 +256,16 @@ void tb_free(TranslationBlock *tb);
>> void tb_flush(CPUState *cpu);
>> void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
>>
>> +static inline void tb_mark_invalid(TranslationBlock *tb)
>> +{
>> + cpu_get_invalid_tb_cpu_state(&tb->pc, &tb->cs_base, &tb->flags);
> Hmmm are we getting something here? Maybe cpu_tb_invalidate_cpu_state?
Just to be similar to cpu_get_tb_cpu_state().
>
>> +}
>> +
>> +static inline bool tb_is_invalid(TranslationBlock *tb)
>> +{
>> + return cpu_tb_cpu_state_is_invalidated(tb->pc, tb->cs_base, tb->flags);
>> +}
> Also why are we passing three pointers to parts of TranslationBlock? Why
> not just pass tb directly and be done with it?
I'm not sure we want to include exec/exec-all.h in target-*/cpu.h
>
> I'm sure the compiler does something sensible but seems overly verbose
> to me.
>
>> +
>> #if defined(USE_DIRECT_JUMP)
>>
>> #if defined(CONFIG_TCG_INTERPRETER)
(snip)
> Otherwise:
>
> Reviewed-by: Alex Bennée <address@hidden>
Kind regards,
Sergey
[Qemu-devel] [PATCH v3 11/11] tcg: Merge tb_find_slow() and tb_find_fast(), Sergey Fedorov, 2016/07/12
[Qemu-devel] [PATCH v3 10/11] tcg: Avoid bouncing tb_lock between tb_gen_code() and tb_add_jump(), Sergey Fedorov, 2016/07/12
Re: [Qemu-devel] [PATCH v3 00/11] Reduce lock contention on TCG hot-path, Paolo Bonzini, 2016/07/13