accel/tcg: Always require can_do_io
Require i/o as the last insn of a TranslationBlock always, not only with icount. This is required for i/o that alters the address space, such as a pci config space write. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1866 Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@ -28,12 +28,6 @@ static void set_can_do_io(DisasContextBase *db, bool val)
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bool translator_io_start(DisasContextBase *db)
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bool translator_io_start(DisasContextBase *db)
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{
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{
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uint32_t cflags = tb_cflags(db->tb);
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if (!(cflags & CF_USE_ICOUNT)) {
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return false;
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}
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set_can_do_io(db, true);
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set_can_do_io(db, true);
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/*
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/*
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@ -86,14 +80,14 @@ static TCGOp *gen_tb_start(DisasContextBase *db, uint32_t cflags)
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tcg_gen_st16_i32(count, cpu_env,
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tcg_gen_st16_i32(count, cpu_env,
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offsetof(ArchCPU, neg.icount_decr.u16.low) -
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offsetof(ArchCPU, neg.icount_decr.u16.low) -
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offsetof(ArchCPU, env));
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offsetof(ArchCPU, env));
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}
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/*
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/*
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* cpu->can_do_io is set automatically here at the beginning of
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* cpu->can_do_io is set automatically here at the beginning of
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* each translation block. The cost is minimal and only paid for
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* each translation block. The cost is minimal, plus it would be
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* -icount, plus it would be very easy to forget doing it in the
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* very easy to forget doing it in the translator.
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* translator.
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*/
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*/
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set_can_do_io(db, db->max_insns == 1 && (cflags & CF_LAST_IO));
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set_can_do_io(db, db->max_insns == 1 && (cflags & CF_LAST_IO));
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}
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return icount_start_insn;
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return icount_start_insn;
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}
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}
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@ -11212,7 +11212,6 @@ static void gen_branch(DisasContext *ctx, int insn_bytes)
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/* Branches completion */
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/* Branches completion */
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clear_branch_hflags(ctx);
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clear_branch_hflags(ctx);
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ctx->base.is_jmp = DISAS_NORETURN;
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ctx->base.is_jmp = DISAS_NORETURN;
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/* FIXME: Need to clear can_do_io. */
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switch (proc_hflags & MIPS_HFLAG_BMASK_BASE) {
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switch (proc_hflags & MIPS_HFLAG_BMASK_BASE) {
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case MIPS_HFLAG_FBNSLOT:
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case MIPS_HFLAG_FBNSLOT:
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gen_goto_tb(ctx, 0, ctx->base.pc_next + insn_bytes);
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gen_goto_tb(ctx, 0, ctx->base.pc_next + insn_bytes);
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