Re: [Qemu-devel] [PATCH] i386: fix read/write cr with icount option

[Paolo Bonzini <pbonzini@redhat.com>]

On 19/05/2017 11:36, Mihail Abakumov wrote:
> Running Windows with icount causes a crash in instruction of write cr.
> This patch fixes it.
> 
> Reading and writing cr cause an icount read because there are called
> cpu_get_apic_tpr and cpu_set_apic_tpr functions. So, there is need
> gen_io_start()/gen_io_end() calls.

The patch looks good, but lacks a signoff.  Please read the Developer 
Certificate of Origin[1] and reply to this email with "Signed-off-by: 
Mihail Abakumov <mikhail.abakumov@ispras.ru>".


[1]     Developer's Certificate of Origin 1.1

        By making a contribution to this project, I certify that:

        (a) The contribution was created in whole or in part by me and I
            have the right to submit it under the open source license
            indicated in the file; or

        (b) The contribution is based upon previous work that, to the best
            of my knowledge, is covered under an appropriate open source
            license and I have the right under that license to submit that
            work with modifications, whether created in whole or in part
            by me, under the same open source license (unless I am
            permitted to submit under a different license), as indicated
            in the file; or

        (c) The contribution was provided directly to me by some other
            person who certified (a), (b) or (c) and I have not modified
            it.

        (d) I understand and agree that this project and the contribution
            are public and that a record of the contribution (including all
            personal information I submit with it, including my sign-off) is
            maintained indefinitely and may be redistributed consistent with
            this project or the open source license(s) involved.

Thanks,

Paolo
> ---
>  target/i386/translate.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/target/i386/translate.c b/target/i386/translate.c
> index 06d8833..3b009bd 100644
> --- a/target/i386/translate.c
> +++ b/target/i386/translate.c
> @@ -7907,14 +7907,26 @@ static target_ulong disas_insn(CPUX86State *env,
> DisasContext *s,
>                  gen_update_cc_op(s);
>                  gen_jmp_im(pc_start - s->cs_base);
>                  if (b & 2) {
> +                    if (s->tb->cflags & CF_USE_ICOUNT) {
> +                        gen_io_start();
> +                    }
>                      gen_op_mov_v_reg(ot, cpu_T0, rm);
>                      gen_helper_write_crN(cpu_env, tcg_const_i32(reg),
>                                           cpu_T0);
> +                    if (s->tb->cflags & CF_USE_ICOUNT) {
> +                        gen_io_end();
> +                    }
>                      gen_jmp_im(s->pc - s->cs_base);
>                      gen_eob(s);
>                  } else {
> +                    if (s->tb->cflags & CF_USE_ICOUNT) {
> +                        gen_io_start();
> +                    }
>                      gen_helper_read_crN(cpu_T0, cpu_env,
> tcg_const_i32(reg));
>                      gen_op_mov_reg_v(ot, rm, cpu_T0);
> +                    if (s->tb->cflags & CF_USE_ICOUNT) {
> +                        gen_io_end();
> +                    }
>                  }
>                  break;
>              default: