Re: [Qemu-devel] [qemu-s390x] [PATCH-for-4.2 v1 4/9] s390x/mmu: Add EDAT2 translation support

[Thomas Huth <thuth@redhat.com>]

On 8/5/19 5:29 PM, David Hildenbrand wrote:
> This only adds basic support to the DAT translation, but no EDAT2 support
> for TCG. E.g., the gdbstub under kvm uses this function, too, to
> translate virtual addresses.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>  target/s390x/mmu_helper.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/target/s390x/mmu_helper.c b/target/s390x/mmu_helper.c
> index de7798284d..5c9c7d385d 100644
> --- a/target/s390x/mmu_helper.c
> +++ b/target/s390x/mmu_helper.c
> @@ -139,6 +139,7 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
>  {
>      const bool edat1 = (env->cregs[0] & CR0_EDAT) &&
>                         s390_has_feat(S390_FEAT_EDAT);
> +    const bool edat2 = edat1 && s390_has_feat(S390_FEAT_EDAT_2);
>      const int asce_tl = asce & ASCE_TABLE_LENGTH;
>      const int asce_p = asce & ASCE_PRIVATE_SPACE;
>      hwaddr gaddr = asce & ASCE_ORIGIN;
> @@ -234,9 +235,16 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
>          if ((entry & REGION_ENTRY_TT) != REGION_ENTRY_TT_REGION3) {
>              return PGM_TRANS_SPEC;
>          }
> +        if (edat2 && (entry & REGION3_ENTRY_CR) && asce_p) {
> +            return PGM_TRANS_SPEC;
> +        }
>          if (edat1 && (entry & REGION_ENTRY_P)) {
>              *flags &= ~PAGE_WRITE;
>          }
> +        if (edat2 && (entry & REGION3_ENTRY_FC)) {
> +            *raddr = entry & REGION3_ENTRY_RFAA;
> +            return 0;
> +        }
>          if (VADDR_SEGMENT_TL(vaddr) < (entry & REGION_ENTRY_TF) >> 6 ||
>              VADDR_SEGMENT_TL(vaddr) > (entry & REGION_ENTRY_TL)) {
>              return PGM_SEGMENT_TRANS;

Reviewed-by: Thomas Huth <thuth@redhat.com>