Re: [RFC v7 13/22] cpu: Move synchronize_from_tb() to tcg_ops

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 11/30/20 3:35 AM, Claudio Fontana wrote:
> From: Eduardo Habkost <ehabkost@redhat.com>
> 
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
>  accel/tcg/cpu-exec.c          |  4 ++--
>  include/hw/core/cpu.h         |  8 --------
>  include/hw/core/tcg-cpu-ops.h | 14 +++++++++++---
>  target/arm/cpu.c              |  2 +-
>  target/avr/cpu.c              |  2 +-
>  target/hppa/cpu.c             |  2 +-
>  target/i386/tcg-cpu.c         |  2 +-
>  target/microblaze/cpu.c       |  2 +-
>  target/mips/cpu.c             |  2 +-
>  target/riscv/cpu.c            |  2 +-
>  target/rx/cpu.c               |  2 +-
>  target/sh4/cpu.c              |  2 +-
>  target/sparc/cpu.c            |  2 +-
>  target/tricore/cpu.c          |  2 +-
>  14 files changed, 24 insertions(+), 24 deletions(-)
> 
> diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
> index 64cba89356..816ef29f68 100644
> --- a/accel/tcg/cpu-exec.c
> +++ b/accel/tcg/cpu-exec.c
> @@ -192,8 +192,8 @@ static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, TranslationBlock *itb)
>                                 TARGET_FMT_lx "] %s\n",
>                                 last_tb->tc.ptr, last_tb->pc,
>                                 lookup_symbol(last_tb->pc));
> -        if (cc->synchronize_from_tb) {
> -            cc->synchronize_from_tb(cpu, last_tb);
> +        if (cc->tcg_ops.synchronize_from_tb) {
> +            cc->tcg_ops.synchronize_from_tb(cpu, last_tb);
>          } else {
>              assert(cc->set_pc);
>              cc->set_pc(cpu, last_tb->pc);
> diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
> index c93b08a0fb..19211cb409 100644
> --- a/include/hw/core/cpu.h
> +++ b/include/hw/core/cpu.h
> @@ -110,13 +110,6 @@ struct TranslationBlock;
>   *       If the target behaviour here is anything other than "set
>   *       the PC register to the value passed in" then the target must
>   *       also implement the synchronize_from_tb hook.
> - * @synchronize_from_tb: Callback for synchronizing state from a TCG
> - *       #TranslationBlock. This is called when we abandon execution
> - *       of a TB before starting it, and must set all parts of the CPU
> - *       state which the previous TB in the chain may not have updated.
> - *       This always includes at least the program counter; some targets
> - *       will need to do more. If this hook is not implemented then the
> - *       default is to call @set_pc(tb->pc).
>   * @tlb_fill: Callback for handling a softmmu tlb miss or user-only
>   *       address fault.  For system mode, if the access is valid, call
>   *       tlb_set_page and return true; if the access is invalid, and
> @@ -193,7 +186,6 @@ struct CPUClass {
>      void (*get_memory_mapping)(CPUState *cpu, MemoryMappingList *list,
>                                 Error **errp);
>      void (*set_pc)(CPUState *cpu, vaddr value);
> -    void (*synchronize_from_tb)(CPUState *cpu, struct TranslationBlock *tb);
>      bool (*tlb_fill)(CPUState *cpu, vaddr address, int size,
>                       MMUAccessType access_type, int mmu_idx,
>                       bool probe, uintptr_t retaddr);
> diff --git a/include/hw/core/tcg-cpu-ops.h b/include/hw/core/tcg-cpu-ops.h
> index 4475ef0996..109291ac52 100644
> --- a/include/hw/core/tcg-cpu-ops.h
> +++ b/include/hw/core/tcg-cpu-ops.h
> @@ -10,9 +10,6 @@
>  #ifndef TCG_CPU_OPS_H
>  #define TCG_CPU_OPS_H
>  
> -/**
> - * struct TcgCpuOperations: TCG operations specific to a CPU class
> - */
>  typedef struct TcgCpuOperations {
>      /**
>       * @initialize: Initalize TCG state
> @@ -20,6 +17,17 @@ typedef struct TcgCpuOperations {
>       * Called when the first CPU is realized.
>       */
>      void (*initialize)(void);
> +    /**
> +     * @synchronize_from_tb: Synchronize state from a TCG #TranslationBlock
> +     *
> +     * This is called when we abandon execution of a TB before
> +     * starting it, and must set all parts of the CPU state which
> +     * the previous TB in the chain may not have updated. This
> +     * will need to do more. If this hook is not implemented then
> +     * the default is to call
> +     * @set_pc(tb->pc).
> +     */
> +    void (*synchronize_from_tb)(CPUState *cpu, struct TranslationBlock *tb);
>  } TcgCpuOperations;
>  
>  #endif /* TCG_CPU_OPS_H */
> diff --git a/target/arm/cpu.c b/target/arm/cpu.c
> index 1fa9382a7c..e29601d7db 100644
> --- a/target/arm/cpu.c
> +++ b/target/arm/cpu.c
> @@ -2242,7 +2242,7 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data)
>      cc->cpu_exec_interrupt = arm_cpu_exec_interrupt;
>      cc->dump_state = arm_cpu_dump_state;
>      cc->set_pc = arm_cpu_set_pc;
> -    cc->synchronize_from_tb = arm_cpu_synchronize_from_tb;
> +    cc->tcg_ops.synchronize_from_tb = arm_cpu_synchronize_from_tb;

Similar comment than previous patch, please keep cc->tcg_ops.*
guarded withing #ifdef CONFIG_TCG.

With this change:
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>