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Re: [Qemu-devel] [RFC PATCH 02/34] tcg+qom: QOMify core CPU defintions
From: |
Richard Henderson |
Subject: |
Re: [Qemu-devel] [RFC PATCH 02/34] tcg+qom: QOMify core CPU defintions |
Date: |
Mon, 11 May 2015 13:18:03 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 05/11/2015 03:24 AM, Paolo Bonzini wrote:
>
>
> On 11/05/2015 12:18, Andreas Färber wrote:
>>>> + int (*cpu_mmu_index)(CPUState *cpu);
>>>> + void (*cpu_get_tb_cpu_state)(CPUState *cpu,
>>>> + void *pc, /* target_long * */
>>>> + void *cs_base, /* target_long */
>>>> + int *flags);
>>>> + void (*gen_intermediate_code)(void *env, struct TranslationBlock *tb);
>>>> + void (*gen_intermediate_code_pc)(void *env, struct TranslationBlock
>>>> *tb);
>>>> + void (*restore_state_to_opc)(void *env, struct TranslationBlock *tb,
>>>> + int pc_pos);
>>>> + void (*tlb_fill)(CPUState *cs, uint64_t addr, int is_write, int
>>>> mmu_idx,
>>>> + uintptr_t retaddr);
>>>> } CPUClass;
>>>>
>>>> #ifdef HOST_WORDS_BIGENDIAN
>> [snip]
>>
>> Paolo had objected to this when I tried it. The counter-suggestion was
>> something about reworking how the cputlb code is built per target -
>> please check the archives.
>
> Right. My point was that these functions are not polymorphic. Each
> call to these should know exactly which function to call.
That's some major surgery you have planned there.
Especially the path via the qemu_ld/st helpers, where function to call is
currently hard-coded into the tcg backend.
I think that this is a decent step forward, modulo the conditionals along the
use paths. I think we ought to clean up all of the translators to the new QOM
hooks.
I can't imagine that most of these hooks are called frequently enough that the
indirect call really matters. Certainly gen_intermediate_code need not use the
hook when initializing the mmu_idx in the DisasContext.
That said, I'd approve of a goal to arrange for the correct qemu_ld/st helpers
to be called, and a direct call to the proper tlb_fill. But, one step at a
time...
r~
- [Qemu-devel] [RFC PATCH 05/34] mb: cpu: Delete MMAP_SHIFT definition, (continued)
- [Qemu-devel] [RFC PATCH 05/34] mb: cpu: Delete MMAP_SHIFT definition, Peter Crosthwaite, 2015/05/11
- [Qemu-devel] [RFC PATCH 07/34] mb: Remove ELF_MACHINE from cpu.h, Peter Crosthwaite, 2015/05/11
- [Qemu-devel] [RFC PATCH 03/34] target-multi: Add, Peter Crosthwaite, 2015/05/11
- [Qemu-devel] [RFC PATCH 01/34] cpu-all: Prototype cpu_exec and cpu_signal_handler, Peter Crosthwaite, 2015/05/11
- [Qemu-devel] [RFC PATCH 02/34] tcg+qom: QOMify core CPU defintions, Peter Crosthwaite, 2015/05/11
- Re: [Qemu-devel] [RFC PATCH 02/34] tcg+qom: QOMify core CPU defintions,
Richard Henderson <=
- Re: [Qemu-devel] [RFC PATCH 02/34] tcg+qom: QOMify core CPU defintions, Peter Crosthwaite, 2015/05/12
- Re: [Qemu-devel] [RFC PATCH 02/34] tcg+qom: QOMify core CPU defintions, Richard Henderson, 2015/05/12
Re: [Qemu-devel] [RFC PATCH 02/34] tcg+qom: QOMify core CPU defintions, Peter Maydell, 2015/05/11
[Qemu-devel] [RFC PATCH 04/34] mb: Change target long to 64b, Peter Crosthwaite, 2015/05/11
Re: [Qemu-devel] [RFC PATCH 00/34] Multi Architecture System Emulation, Peter Maydell, 2015/05/11
Re: [Qemu-devel] [RFC PATCH 00/34] Multi Architecture System Emulation, Andreas Färber, 2015/05/11