Re: [PATCH v3 06/18] target/s390x: Push trigger_pgm_exception lower in s390_cpu_tlb_fill

[David Hildenbrand <david@redhat.com>]

On 26.09.19 18:26, Richard Henderson wrote:
> Delay triggering an exception until the end, after we have
> determined ultimate success or failure, and also taken into
> account whether this is a non-faulting probe.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  target/s390x/excp_helper.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/target/s390x/excp_helper.c b/target/s390x/excp_helper.c
> index dbff772d34..552098be5f 100644
> --- a/target/s390x/excp_helper.c
> +++ b/target/s390x/excp_helper.c
> @@ -127,7 +127,7 @@ bool s390_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
>      CPUS390XState *env = &cpu->env;
>      target_ulong vaddr, raddr;
>      uint64_t asc;
> -    int prot, fail;
> +    int prot, fail, excp;
>  
>      qemu_log_mask(CPU_LOG_MMU, "%s: addr 0x%" VADDR_PRIx " rw %d mmu_idx %d\n",
>                    __func__, address, access_type, mmu_idx);
> @@ -141,12 +141,14 @@ bool s390_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
>              vaddr &= 0x7fffffff;
>          }
>          fail = mmu_translate(env, vaddr, access_type, asc, &raddr, &prot, true);
> +        excp = 0; /* exception already raised */
>      } else if (mmu_idx == MMU_REAL_IDX) {
>          /* 31-Bit mode */
>          if (!(env->psw.mask & PSW_MASK_64)) {
>              vaddr &= 0x7fffffff;
>          }
>          fail = mmu_translate_real(env, vaddr, access_type, &raddr, &prot);
> +        excp = 0; /* exception already raised */
>      } else {
>          g_assert_not_reached();
>      }
> @@ -159,7 +161,7 @@ bool s390_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
>          qemu_log_mask(CPU_LOG_MMU,
>                        "%s: raddr %" PRIx64 " > ram_size %" PRIx64 "\n",
>                        __func__, (uint64_t)raddr, (uint64_t)ram_size);
> -        trigger_pgm_exception(env, PGM_ADDRESSING, ILEN_AUTO);
> +        excp = PGM_ADDRESSING;
>          fail = 1;
>      }
>  
> @@ -175,6 +177,9 @@ bool s390_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
>          return false;
>      }
>  
> +    if (excp) {
> +        trigger_pgm_exception(env, excp, ILEN_AUTO);
> +    }
>      cpu_restore_state(cs, retaddr, true);
>  
>      /*
> 

Depends on what's going to follow next, but the change itself

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 

Thanks,

David / dhildenb