Re: [PATCH V2 09/10] gdbstub: Add helper function to unregister GDB register space

[Gavin Shan <gshan@redhat.com>]

On 9/30/23 10:19, Salil Mehta wrote:
> Add common function to help unregister the GDB Register Space. This shall be
> done in context to the CPU unrealization.
> 
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> ---
>   gdbstub/gdbstub.c      | 14 ++++++++++++++
>   include/exec/gdbstub.h |  5 +++++
>   2 files changed, 19 insertions(+)
> 

With the following nits addressed:

Reviewed-by: Gavin Shan <gshan@redhat.com>

> diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
> index 349d348c7b..89ac0edfea 100644
> --- a/gdbstub/gdbstub.c
> +++ b/gdbstub/gdbstub.c
> @@ -491,6 +491,20 @@ void gdb_register_coprocessor(CPUState *cpu,
>       }
>   }
>   
> +void gdb_unregister_coprocessor_all(CPUState *cpu)
> +{
> +    GDBRegisterState *s, *p;
> +
> +    p = cpu->gdb_regs;
> +    while (p) {
> +        s = p;
> +        p = p->next;
> +        /* s->xml is static const char so isn't freed */
                                      ^^^
                                      string so that it needn't be freed
> +        g_free(s);
> +    }
> +    cpu->gdb_regs = NULL;
> +}
> +

For consistency, CPUState::gdb_num_regs and CPUState::gdb_num_g_regs
need to be updated accordingly, even the CPU instance will be destroyed
shortly.

>   static void gdb_process_breakpoint_remove_all(GDBProcess *p)
>   {
>       CPUState *cpu = gdb_get_first_cpu_in_process(p);
> diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
> index 16a139043f..7d1368d377 100644
> --- a/include/exec/gdbstub.h
> +++ b/include/exec/gdbstub.h
> @@ -27,6 +27,11 @@ typedef int (*gdb_set_reg_cb)(CPUArchState *env, uint8_t *buf, int reg);
>   void gdb_register_coprocessor(CPUState *cpu,
>                                 gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg,
>                                 int num_regs, const char *xml, int g_pos);
> +/**
> + * gdb_unregister_coprocessor_all() - unregisters supplemental set of registers
> + * @cpu - the CPU associated with registers
> + */
> +void gdb_unregister_coprocessor_all(CPUState *cpu);
>   
>   /**
>    * gdbserver_start: start the gdb server

Thanks,
Gavin