Re: [Qemu-devel] [PATCH 3/3] ppc: fix hrfid, tlbia and slbia privilege

[Thomas Huth <thuth@redhat.com>]

On 03.06.2016 14:11, Cédric Le Goater wrote:
> commit 74693da98894 ('ppc: tlbie, tlbia and tlbisync are HV only')
> introduced some extra checks on the instruction privilege. slbia was
> changed wrongly and hrfid, tlbia were forgotten.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>  target-ppc/translate.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/target-ppc/translate.c b/target-ppc/translate.c
> index ad262523abca..776343170a53 100644
> --- a/target-ppc/translate.c
> +++ b/target-ppc/translate.c
> @@ -4108,7 +4108,7 @@ static void gen_hrfid(DisasContext *ctx)
>      gen_inval_exception(ctx, POWERPC_EXCP_PRIV_OPC);
>  #else
>      /* Restore CPU state */
> -    if (unlikely(!ctx->hv)) {
> +    if (unlikely(ctx->pr || !ctx->hv)) {
>          gen_inval_exception(ctx, POWERPC_EXCP_PRIV_OPC);
>          return;
>      }
> @@ -4845,7 +4845,7 @@ static void gen_tlbia(DisasContext *ctx)
>  #if defined(CONFIG_USER_ONLY)
>      gen_inval_exception(ctx, POWERPC_EXCP_PRIV_OPC);
>  #else
> -    if (unlikely(ctx->pr)) {
> +    if (unlikely(ctx->pr || !ctx->hv)) {
>          gen_inval_exception(ctx, POWERPC_EXCP_PRIV_OPC);
>          return;
>      }
> @@ -4913,7 +4913,7 @@ static void gen_slbia(DisasContext *ctx)
>  #if defined(CONFIG_USER_ONLY)
>      gen_inval_exception(ctx, POWERPC_EXCP_PRIV_OPC);
>  #else
> -    if (unlikely(ctx->pr || !ctx->hv)) {
> +    if (unlikely(ctx->pr)) {
>          gen_inval_exception(ctx, POWERPC_EXCP_PRIV_OPC);
>          return;
>      }

I just double-checked the PowerISA 2.07, and you're right, hrfid and
tlbia are hypervisor-privileged, slbia is only "normal" privileged.

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