Re: [Qemu-devel] [PATCH v5 28/30] target-ppc: Enable DABRX SPR and limit it to <=POWER7

[Tom Musta <tommusta@gmail.com>]

On 6/4/2014 7:51 AM, Alexey Kardashevskiy wrote:
> This adds DABRX SPR.
> 
> As DABR(X) are present in POWER CPUs till POWER7 only and POWER8 does not
> have them (as it implements more powerful facility instead), this limits
> DABR/DABRX registration by POWER7 (inclusive).
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> ---
> Changes:
> v5:
> * enabled access for super-mode
> * added "TODO" comment
> ---
>  target-ppc/translate_init.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
> index 04390a5..85581c9 100644
> --- a/target-ppc/translate_init.c
> +++ b/target-ppc/translate_init.c
> @@ -7411,10 +7411,21 @@ static void gen_spr_book3s_altivec(CPUPPCState *env)
>  
>  static void gen_spr_book3s_dbg(CPUPPCState *env)
>  {
> +    /*
> +     * TODO: different specs define different scopes for these,
> +     * will have to address this:
> +     * 970: super/write and super/read
> +     * powerisa 2.03..2.04: hypv/write and super/read.
> +     * powerisa 2.05 and newer: hypv/write and hypv/read.
> +     */
>      spr_register_kvm(env, SPR_DABR, "DABR",
>                       SPR_NOACCESS, SPR_NOACCESS,
>                       &spr_read_generic, &spr_write_generic,
>                       KVM_REG_PPC_DABR, 0x00000000);
> +    spr_register_kvm(env, SPR_DABRX, "DABRX",
> +                     SPR_NOACCESS, SPR_NOACCESS,
> +                     &spr_read_generic, &spr_write_generic,
> +                     KVM_REG_PPC_DABRX, 0x00000000);
>  }
>  
>  static void gen_spr_970_dbg(CPUPPCState *env)
> @@ -7793,7 +7804,6 @@ static void init_proc_book3s_64(CPUPPCState *env, int version)
>      gen_spr_book3s_altivec(env);
>      gen_spr_book3s_pmu_sup(env);
>      gen_spr_book3s_pmu_user(env);
> -    gen_spr_book3s_dbg(env);
>      gen_spr_book3s_common(env);
>  
>      switch (version) {
> @@ -7837,6 +7847,9 @@ static void init_proc_book3s_64(CPUPPCState *env, int version)
>          gen_spr_power8_pmu_user(env);
>          gen_spr_power8_tm(env);
>      }
> +    if (version < BOOK3S_CPU_POWER8) {
> +        gen_spr_book3s_dbg(env);
> +    }
>  #if !defined(CONFIG_USER_ONLY)
>      switch (version) {
>      case BOOK3S_CPU_970:
> 
Reviewed-by: Tom Musta <tommusta@gmail.com>