[Qemu-devel] [PATCH] target-ppc: Fix h_enter to loop correctly

[Qemu-devel] [PATCH] target-ppc: Fix h_enter to loop correctly

[Aneesh Kumar K.V]

From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

We wanted to loop till index is 8. On 8 we return with H_PTEG_FULL. If we are
successful in loading hpte with any other index, we continue with that
index value.

Reported-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 hw/ppc/spapr_hcall.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index e999bbaea062..2ab55d568bf4 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -110,16 +110,15 @@ static target_ulong h_enter(PowerPCCPU *cpu, sPAPREnvironment *spapr,
     if (likely((flags & H_EXACT) == 0)) {
         pte_index &= ~7ULL;
         token = ppc_hash64_start_access(cpu, pte_index);
-        do {
-            if (index == 8) {
-                ppc_hash64_stop_access(token);
-                return H_PTEG_FULL;
-            }
+        for (; index < 8; index++) {
             if ((ppc_hash64_load_hpte0(env, token, index) & HPTE64_V_VALID) == 0) {
                 break;
             }
-        } while (index++);
+        }
         ppc_hash64_stop_access(token);
+        if (index == 8) {
+            return H_PTEG_FULL;
+        }
     } else {
         token = ppc_hash64_start_access(cpu, pte_index);
         if (ppc_hash64_load_hpte0(env, token, 0) & HPTE64_V_VALID) {
-- 
1.8.3.2

Re: [Qemu-devel] [PATCH] target-ppc: Fix h_enter to loop correctly

[Aneesh Kumar K.V]

Hi,

I guess this should get into 2.0 ?

"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> writes:

> From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
>
> We wanted to loop till index is 8. On 8 we return with H_PTEG_FULL. If we are
> successful in loading hpte with any other index, we continue with that
> index value.
>
> Reported-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> ---
>  hw/ppc/spapr_hcall.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index e999bbaea062..2ab55d568bf4 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -110,16 +110,15 @@ static target_ulong h_enter(PowerPCCPU *cpu, sPAPREnvironment *spapr,
>      if (likely((flags & H_EXACT) == 0)) {
>          pte_index &= ~7ULL;
>          token = ppc_hash64_start_access(cpu, pte_index);
> -        do {
> -            if (index == 8) {
> -                ppc_hash64_stop_access(token);
> -                return H_PTEG_FULL;
> -            }
> +        for (; index < 8; index++) {
>              if ((ppc_hash64_load_hpte0(env, token, index) & HPTE64_V_VALID) == 0) {
>                  break;
>              }
> -        } while (index++);
> +        }
>          ppc_hash64_stop_access(token);
> +        if (index == 8) {
> +            return H_PTEG_FULL;
> +        }
>      } else {
>          token = ppc_hash64_start_access(cpu, pte_index);
>          if (ppc_hash64_load_hpte0(env, token, 0) & HPTE64_V_VALID) {
> -- 
> 1.8.3.2

-aneesh

Re: [Qemu-devel] [PATCH] target-ppc: Fix h_enter to loop correctly

[Andreas Färber]

Am 14.03.2014 14:51, schrieb Aneesh Kumar K.V:
> From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
> 
> We wanted to loop till index is 8. On 8 we return with H_PTEG_FULL. If we are
> successful in loading hpte with any other index, we continue with that
> index value.
> 
> Reported-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

Thanks, applied to my ppc-next:
https://github.com/afaerber/qemu-cpu/commits/ppc-next

Andreas

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GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg

Re: [Qemu-devel] [PATCH] target-ppc: Fix h_enter to loop correctly

[Paolo Bonzini]

Il 14/03/2014 14:51, Aneesh Kumar K.V ha scritto:
> From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
>
> We wanted to loop till index is 8. On 8 we return with H_PTEG_FULL. If we are
> successful in loading hpte with any other index, we continue with that
> index value.
>
> Reported-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> ---
>  hw/ppc/spapr_hcall.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index e999bbaea062..2ab55d568bf4 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -110,16 +110,15 @@ static target_ulong h_enter(PowerPCCPU *cpu, sPAPREnvironment *spapr,
>      if (likely((flags & H_EXACT) == 0)) {
>          pte_index &= ~7ULL;
>          token = ppc_hash64_start_access(cpu, pte_index);
> -        do {
> -            if (index == 8) {
> -                ppc_hash64_stop_access(token);
> -                return H_PTEG_FULL;
> -            }
> +        for (; index < 8; index++) {
>              if ((ppc_hash64_load_hpte0(env, token, index) & HPTE64_V_VALID) == 0) {
>                  break;
>              }
> -        } while (index++);
> +        }
>          ppc_hash64_stop_access(token);
> +        if (index == 8) {
> +            return H_PTEG_FULL;
> +        }
>      } else {
>          token = ppc_hash64_start_access(cpu, pte_index);
>          if (ppc_hash64_load_hpte0(env, token, 0) & HPTE64_V_VALID) {
>

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>