Re: [PATCH v6 12/18] target/ppc: Don't store VRMA SLBE persistently

[Fabiano Rosas <farosas@linux.ibm.com>]

David Gibson <david@gibson.dropbear.id.au> writes:

> Currently, we construct the SLBE used for VRMA translations when the LPCR
> is written (which controls some bits in the SLBE), then use it later for
> translations.
>
> This is a bit complex and confusing - simplify it by simply constructing
> the SLBE directly from the LPCR when we need it.
>
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>

> ---
>  target/ppc/cpu.h        |  3 ---
>  target/ppc/mmu-hash64.c | 28 ++++++----------------------
>  2 files changed, 6 insertions(+), 25 deletions(-)
>
> diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
> index f9871b1233..5a55fb02bd 100644
> --- a/target/ppc/cpu.h
> +++ b/target/ppc/cpu.h
> @@ -1044,9 +1044,6 @@ struct CPUPPCState {
>      uint32_t flags;
>      uint64_t insns_flags;
>      uint64_t insns_flags2;
> -#if defined(TARGET_PPC64)
> -    ppc_slb_t vrma_slb;
> -#endif
>  
>      int error_code;
>      uint32_t pending_interrupts;
> diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
> index ac21c14f68..f8bf92aa2e 100644
> --- a/target/ppc/mmu-hash64.c
> +++ b/target/ppc/mmu-hash64.c
> @@ -825,6 +825,7 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
>  {
>      CPUState *cs = CPU(cpu);
>      CPUPPCState *env = &cpu->env;
> +    ppc_slb_t vrma_slbe;
>      ppc_slb_t *slb;
>      unsigned apshift;
>      hwaddr ptex;
> @@ -863,8 +864,8 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
>              }
>          } else if (ppc_hash64_use_vrma(env)) {
>              /* Emulated VRMA mode */
> -            slb = &env->vrma_slb;
> -            if (!slb->sps) {
> +            slb = &vrma_slbe;
> +            if (build_vrma_slbe(cpu, slb) != 0) {
>                  /* Invalid VRMA setup, machine check */
>                  cs->exception_index = POWERPC_EXCP_MCHECK;
>                  env->error_code = 0;
> @@ -1012,6 +1013,7 @@ skip_slb_search:
>  hwaddr ppc_hash64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong addr)
>  {
>      CPUPPCState *env = &cpu->env;
> +    ppc_slb_t vrma_slbe;
>      ppc_slb_t *slb;
>      hwaddr ptex, raddr;
>      ppc_hash_pte64_t pte;
> @@ -1033,8 +1035,8 @@ hwaddr ppc_hash64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong addr)
>              return raddr | env->spr[SPR_HRMOR];
>          } else if (ppc_hash64_use_vrma(env)) {
>              /* Emulated VRMA mode */
> -            slb = &env->vrma_slb;
> -            if (!slb->sps) {
> +            slb = &vrma_slbe;
> +            if (build_vrma_slbe(cpu, slb) != 0) {
>                  return -1;
>              }
>          } else {
> @@ -1072,30 +1074,12 @@ void ppc_hash64_tlb_flush_hpte(PowerPCCPU *cpu, target_ulong ptex,
>      cpu->env.tlb_need_flush = TLB_NEED_GLOBAL_FLUSH | TLB_NEED_LOCAL_FLUSH;
>  }
>  
> -static void ppc_hash64_update_vrma(PowerPCCPU *cpu)
> -{
> -    CPUPPCState *env = &cpu->env;
> -    ppc_slb_t *slb = &env->vrma_slb;
> -
> -    /* Is VRMA enabled ? */
> -    if (ppc_hash64_use_vrma(env)) {
> -        if (build_vrma_slbe(cpu, slb) == 0) {
> -            return;
> -        }
> -    }
> -
> -    /* Otherwise, clear it to indicate error */
> -    slb->esid = slb->vsid = 0;
> -    slb->sps = NULL;
> -}
> -
>  void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong val)
>  {
>      PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
>      CPUPPCState *env = &cpu->env;
>  
>      env->spr[SPR_LPCR] = val & pcc->lpcr_mask;
> -    ppc_hash64_update_vrma(cpu);
>  }
>  
>  void helper_store_lpcr(CPUPPCState *env, target_ulong val)