Re: [Qemu-devel] [PATCH] target-i386: Fix I/O bitmap checks for in/out

[Kevin Wolf <kwolf@redhat.com>]

Am 24.01.2014 um 11:19 hat Kevin Wolf geschrieben:
> Commit 1b90d56e changed the implementation of in/out imm to not assign
> the accessed port number to cpu_T[0] as it appeared unnecessary.
> However, currently gen_check_io() makes use of cpu_T[0] to implement the
> I/O bitmap checks, so it's in fact still used and the change broke the
> check, leading to #GP in legitimate cases (and probably also allowing
> access to ports that shouldn't be allowed).
> 
> This patch reintroduces the missing assignment for these cases.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Reviewed-by: Richard Henderson <rth@twiddle.net>

Ping?

/me considers sending a one-patch pull request for an area he's
absolutely not maintaining, but if this is the only way to get patches
applied to qemu...

Kevin

> ---
>  target-i386/translate.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/target-i386/translate.c b/target-i386/translate.c
> index b0f2279..5dd2450 100644
> --- a/target-i386/translate.c
> +++ b/target-i386/translate.c
> @@ -6284,6 +6284,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
>      case 0xe5:
>          ot = mo_b_d32(b, dflag);
>          val = cpu_ldub_code(env, s->pc++);
> +        tcg_gen_movi_tl(cpu_T[0], val);
>          gen_check_io(s, ot, pc_start - s->cs_base,
>                       SVM_IOIO_TYPE_MASK | svm_is_rep(prefixes));
>          if (use_icount)
> @@ -6300,6 +6301,7 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
>      case 0xe7:
>          ot = mo_b_d32(b, dflag);
>          val = cpu_ldub_code(env, s->pc++);
> +        tcg_gen_movi_tl(cpu_T[0], val);
>          gen_check_io(s, ot, pc_start - s->cs_base,
>                       svm_is_rep(prefixes));
>          gen_op_mov_v_reg(ot, cpu_T[1], R_EAX);
> -- 
> 1.8.1.4
>