Re: [PATCH v9 09/15] s390x: protvirt: Set guest IPL PSW

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

On Wed, 11 Mar 2020 09:21:45 -0400
Janosch Frank <frankja@linux.ibm.com> wrote:

> Handling of CPU reset and setting of the IPL psw from guest storage at
> offset 0 is done by a Ultravisor call. Let's only fetch it if
> necessary.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> ---
>  target/s390x/cpu.c | 22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
> index 84029f14814b4980..a48d39f139cdc1c4 100644
> --- a/target/s390x/cpu.c
> +++ b/target/s390x/cpu.c
> @@ -78,16 +78,20 @@ static bool s390_cpu_has_work(CPUState *cs)
>  static void s390_cpu_load_normal(CPUState *s)
>  {
>      S390CPU *cpu = S390_CPU(s);
> -    uint64_t spsw = ldq_phys(s->as, 0);
> -
> -    cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
> -    /*
> -     * Invert short psw indication, so SIE will report a
> specification
> -     * exception if it was not set.
> -     */
> -    cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
> -    cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
> +    uint64_t spsw;
>  
> +    if (!s390_is_pv()) {
> +        spsw = ldq_phys(s->as, 0);
> +        cpu->env.psw.mask = spsw & PSW_MASK_SHORT_CTRL;
> +        /*
> +         * Invert short psw indication, so SIE will report a
> specification
> +         * exception if it was not set.
> +         */
> +        cpu->env.psw.mask ^= PSW_MASK_SHORTPSW;
> +        cpu->env.psw.addr = spsw & PSW_MASK_SHORT_ADDR;
> +    } else {
> +        s390_cpu_set_state(S390_CPU_STATE_LOAD, cpu);
> +    }
>      s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
>  }
>  #endif

I don't understand why you set the state to S390_CPU_STATE_LOAD and
then immediately afterwards to S390_CPU_STATE_OPERATING, especially
considering that both do the same