Re: [PATCH 4/5] ppc: spapr: cleanup spapr_exit_nested() with helper routines.

[Fabiano Rosas <farosas@suse.de>]

Harsh Prateek Bora <harshpb@linux.ibm.com> writes:

> Currently, in spapr_exit_nested(), it does a lot of register state
> restoring from ptregs/hvstate after mapping each of those before
> restoring the L1 host state. This patch breaks down those set of ops
> to respective helper routines for better code readability/maintenance.
>
> Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
> ---
>  hw/ppc/spapr_hcall.c | 132 +++++++++++++++++++++++++------------------
>  1 file changed, 78 insertions(+), 54 deletions(-)
>
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index a77b4c9076..ed3a21471d 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1701,36 +1701,23 @@ static target_ulong h_enter_nested(PowerPCCPU *cpu,
>      return env->gpr[3];
>  }
>  
> -void spapr_exit_nested(PowerPCCPU *cpu, int excp)
> +static void restore_hvstate_from_env(struct kvmppc_hv_guest_state *hvstate,
> +                                     CPUPPCState *env, int excp)
>  {
> -    CPUState *cs = CPU(cpu);
> -    CPUPPCState *env = &cpu->env;
> -    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
> -    target_ulong r3_return = env->excp_vectors[excp]; /* hcall return value */
> -    target_ulong hv_ptr = spapr_cpu->nested_host_state->gpr[4];
> -    target_ulong regs_ptr = spapr_cpu->nested_host_state->gpr[5];
> -    struct kvmppc_hv_guest_state *hvstate;
> -    struct kvmppc_pt_regs *regs;
> -    hwaddr len;
> -
> -    assert(spapr_cpu->in_nested);
> -
> -    cpu_ppc_hdecr_exit(env);
> -
> -    len = sizeof(*hvstate);
> -    hvstate = address_space_map(CPU(cpu)->as, hv_ptr, &len, true,
> -                                MEMTXATTRS_UNSPECIFIED);
> -    if (len != sizeof(*hvstate)) {
> -        address_space_unmap(CPU(cpu)->as, hvstate, len, 0, true);
> -        r3_return = H_PARAMETER;
> -        goto out_restore_l1;
> -    }
> -
> -    hvstate->cfar = env->cfar;
> -    hvstate->lpcr = env->spr[SPR_LPCR];
> -    hvstate->pcr = env->spr[SPR_PCR];
> -    hvstate->dpdes = env->spr[SPR_DPDES];
> -    hvstate->hfscr = env->spr[SPR_HFSCR];
> +    hvstate->cfar    = env->cfar;
> +    hvstate->lpcr    = env->spr[SPR_LPCR];
> +    hvstate->pcr     = env->spr[SPR_PCR];
> +    hvstate->dpdes   = env->spr[SPR_DPDES];
> +    hvstate->hfscr   = env->spr[SPR_HFSCR];
> +    /* HEIR should be implemented for HV mode and saved here. */
> +    hvstate->srr0    = env->spr[SPR_SRR0];
> +    hvstate->srr1    = env->spr[SPR_SRR1];
> +    hvstate->sprg[0] = env->spr[SPR_SPRG0];
> +    hvstate->sprg[1] = env->spr[SPR_SPRG1];
> +    hvstate->sprg[2] = env->spr[SPR_SPRG2];
> +    hvstate->sprg[3] = env->spr[SPR_SPRG3];
> +    hvstate->pidr    = env->spr[SPR_BOOKS_PID];
> +    hvstate->ppr     = env->spr[SPR_PPR];

Just leave these lines as they were. Let's avoid spending time
discussing code style. Also, the patch became harder to review by having
these unrelated changes interspersed.