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Re: [PATCH v2 1/2] spapr: Introduce a interrupt presenter reset handler


From: Greg Kurz
Subject: Re: [PATCH v2 1/2] spapr: Introduce a interrupt presenter reset handler
Date: Sat, 19 Oct 2019 08:02:35 +0200

On Fri, 18 Oct 2019 19:22:18 +0200
Cédric Le Goater <address@hidden> wrote:

> The interrupt presenters are created by a machine handler at the core
> level and are reseted independently. This is not consistent and it
> raises some issues when it comes to handle hot-plugged CPUs. These are
> reseted from the realize handler of the core and the presenters are
> not. This is less of an issue in XICS, although a zero MFFR could be a
> concern, but in XIVE, the OS CAM line is not set and this breaks the
> presenting algorithm. The current code has workarounds which need a
> global cleanup.
> 
> Extend the sPAPR IRQ backend with a new cpu_intc_reset() handler which
> will be called by the CPU reset handler and remove the XiveTCTX reset
> handler which is redundant.
> 
> spapr_realize_vcpu() is modified to call the CPU reset only after the
> intc presenter has been created.
> 
> Signed-off-by: Cédric Le Goater <address@hidden>
> ---
> 
>  The change of order of the CPU reset and the intc creation could be
>  in its own patch for bisect. This is fragile.
>  

And there's a nit. See below.

Otherwise, LGTM.

>  include/hw/ppc/spapr_irq.h |  2 ++
>  include/hw/ppc/xics.h      |  1 +
>  include/hw/ppc/xive.h      |  1 +
>  hw/intc/spapr_xive.c       |  7 +++++++
>  hw/intc/xics.c             |  8 ++------
>  hw/intc/xics_spapr.c       |  7 +++++++
>  hw/intc/xive.c             | 12 +-----------
>  hw/ppc/spapr_cpu_core.c    | 14 ++++++++++----
>  hw/ppc/spapr_irq.c         | 14 ++++++++++++++
>  9 files changed, 45 insertions(+), 21 deletions(-)
> 
> diff --git a/include/hw/ppc/spapr_irq.h b/include/hw/ppc/spapr_irq.h
> index 5e150a667902..09232999b07e 100644
> --- a/include/hw/ppc/spapr_irq.h
> +++ b/include/hw/ppc/spapr_irq.h
> @@ -52,6 +52,7 @@ typedef struct SpaprInterruptControllerClass {
>       */
>      int (*cpu_intc_create)(SpaprInterruptController *intc,
>                              PowerPCCPU *cpu, Error **errp);
> +    void (*cpu_intc_reset)(SpaprInterruptController *intc, PowerPCCPU *cpu);
>      int (*claim_irq)(SpaprInterruptController *intc, int irq, bool lsi,
>                       Error **errp);
>      void (*free_irq)(SpaprInterruptController *intc, int irq);
> @@ -68,6 +69,7 @@ void spapr_irq_update_active_intc(SpaprMachineState *spapr);
>  
>  int spapr_irq_cpu_intc_create(SpaprMachineState *spapr,
>                                PowerPCCPU *cpu, Error **errp);
> +void spapr_irq_cpu_intc_reset(SpaprMachineState *spapr, PowerPCCPU *cpu);
>  void spapr_irq_print_info(SpaprMachineState *spapr, Monitor *mon);
>  void spapr_irq_dt(SpaprMachineState *spapr, uint32_t nr_servers,
>                    void *fdt, uint32_t phandle);
> diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
> index 1e6a9300eb2b..602173c12250 100644
> --- a/include/hw/ppc/xics.h
> +++ b/include/hw/ppc/xics.h
> @@ -161,6 +161,7 @@ void icp_set_mfrr(ICPState *icp, uint8_t mfrr);
>  uint32_t icp_accept(ICPState *ss);
>  uint32_t icp_ipoll(ICPState *ss, uint32_t *mfrr);
>  void icp_eoi(ICPState *icp, uint32_t xirr);
> +void icp_reset(ICPState *icp);
>  
>  void ics_write_xive(ICSState *ics, int nr, int server,
>                      uint8_t priority, uint8_t saved_priority);
> diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
> index fd3319bd3202..99381639f50c 100644
> --- a/include/hw/ppc/xive.h
> +++ b/include/hw/ppc/xive.h
> @@ -415,6 +415,7 @@ uint64_t xive_tctx_tm_read(XiveTCTX *tctx, hwaddr offset, 
> unsigned size);
>  
>  void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon);
>  Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp);
> +void xive_tctx_reset(XiveTCTX *tctx);
>  
>  static inline uint32_t xive_nvt_cam_line(uint8_t nvt_blk, uint32_t nvt_idx)
>  {
> diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
> index ba32d2cc5b0f..258b1c5fb5ff 100644
> --- a/hw/intc/spapr_xive.c
> +++ b/hw/intc/spapr_xive.c
> @@ -553,6 +553,12 @@ static int 
> spapr_xive_cpu_intc_create(SpaprInterruptController *intc,
>      return 0;
>  }
>  
> +static void spapr_xive_cpu_intc_reset(SpaprInterruptController *intc,
> +                                     PowerPCCPU *cpu)
> +{
> +    xive_tctx_reset(spapr_cpu_state(cpu)->tctx);
> +}
> +
>  static void spapr_xive_set_irq(SpaprInterruptController *intc, int irq, int 
> val)
>  {
>      SpaprXive *xive = SPAPR_XIVE(intc);
> @@ -697,6 +703,7 @@ static void spapr_xive_class_init(ObjectClass *klass, 
> void *data)
>      sicc->activate = spapr_xive_activate;
>      sicc->deactivate = spapr_xive_deactivate;
>      sicc->cpu_intc_create = spapr_xive_cpu_intc_create;
> +    sicc->cpu_intc_reset = spapr_xive_cpu_intc_reset;
>      sicc->claim_irq = spapr_xive_claim_irq;
>      sicc->free_irq = spapr_xive_free_irq;
>      sicc->set_irq = spapr_xive_set_irq;
> diff --git a/hw/intc/xics.c b/hw/intc/xics.c
> index b5ac408f7b74..6da05763f9db 100644
> --- a/hw/intc/xics.c
> +++ b/hw/intc/xics.c
> @@ -274,10 +274,8 @@ static const VMStateDescription vmstate_icp_server = {
>      },
>  };
>  
> -static void icp_reset_handler(void *dev)
> +void icp_reset(ICPState *icp)
>  {
> -    ICPState *icp = ICP(dev);
> -
>      icp->xirr = 0;
>      icp->pending_priority = 0xff;
>      icp->mfrr = 0xff;
> @@ -288,7 +286,7 @@ static void icp_reset_handler(void *dev)
>      if (kvm_irqchip_in_kernel()) {
>          Error *local_err = NULL;
>  
> -        icp_set_kvm_state(ICP(dev), &local_err);
> +        icp_set_kvm_state(icp, &local_err);
>          if (local_err) {
>              error_report_err(local_err);
>          }
> @@ -351,7 +349,6 @@ static void icp_realize(DeviceState *dev, Error **errp)
>          }
>      }
>  
> -    qemu_register_reset(icp_reset_handler, dev);
>      vmstate_register(NULL, icp->cs->cpu_index, &vmstate_icp_server, icp);
>  }
>  
> @@ -360,7 +357,6 @@ static void icp_unrealize(DeviceState *dev, Error **errp)
>      ICPState *icp = ICP(dev);
>  
>      vmstate_unregister(NULL, &vmstate_icp_server, icp);
> -    qemu_unregister_reset(icp_reset_handler, dev);
>  }
>  
>  static void icp_class_init(ObjectClass *klass, void *data)
> diff --git a/hw/intc/xics_spapr.c b/hw/intc/xics_spapr.c
> index 4f64b9a9fc66..7418fb9f370c 100644
> --- a/hw/intc/xics_spapr.c
> +++ b/hw/intc/xics_spapr.c
> @@ -346,6 +346,12 @@ static int 
> xics_spapr_cpu_intc_create(SpaprInterruptController *intc,
>      return 0;
>  }
>  
> +static void xics_spapr_cpu_intc_reset(SpaprInterruptController *intc,
> +                                     PowerPCCPU *cpu)
> +{
> +    icp_reset(spapr_cpu_state(cpu)->icp);
> +}
> +
>  static int xics_spapr_claim_irq(SpaprInterruptController *intc, int irq,
>                                  bool lsi, Error **errp)
>  {
> @@ -433,6 +439,7 @@ static void ics_spapr_class_init(ObjectClass *klass, void 
> *data)
>      sicc->activate = xics_spapr_activate;
>      sicc->deactivate = xics_spapr_deactivate;
>      sicc->cpu_intc_create = xics_spapr_cpu_intc_create;
> +    sicc->cpu_intc_reset = xics_spapr_cpu_intc_reset;
>      sicc->claim_irq = xics_spapr_claim_irq;
>      sicc->free_irq = xics_spapr_free_irq;
>      sicc->set_irq = xics_spapr_set_irq;
> diff --git a/hw/intc/xive.c b/hw/intc/xive.c
> index d420c6571e14..f066be5eb5e3 100644
> --- a/hw/intc/xive.c
> +++ b/hw/intc/xive.c
> @@ -547,10 +547,8 @@ void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor 
> *mon)
>      }
>  }
>  
> -static void xive_tctx_reset(void *dev)
> +void xive_tctx_reset(XiveTCTX *tctx)
>  {
> -    XiveTCTX *tctx = XIVE_TCTX(dev);
> -
>      memset(tctx->regs, 0, sizeof(tctx->regs));
>  
>      /* Set some defaults */
> @@ -607,13 +605,6 @@ static void xive_tctx_realize(DeviceState *dev, Error 
> **errp)
>              return;
>          }
>      }
> -
> -    qemu_register_reset(xive_tctx_reset, dev);
> -}
> -
> -static void xive_tctx_unrealize(DeviceState *dev, Error **errp)
> -{
> -    qemu_unregister_reset(xive_tctx_reset, dev);
>  }
>  
>  static int vmstate_xive_tctx_pre_save(void *opaque)
> @@ -668,7 +659,6 @@ static void xive_tctx_class_init(ObjectClass *klass, void 
> *data)
>  
>      dc->desc = "XIVE Interrupt Thread Context";
>      dc->realize = xive_tctx_realize;
> -    dc->unrealize = xive_tctx_unrealize;
>      dc->vmsd = &vmstate_xive_tctx;
>      /*
>       * Reason: part of XIVE interrupt controller, needs to be wired up
> diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
> index 3e4302c7d596..d04baa7cde4f 100644
> --- a/hw/ppc/spapr_cpu_core.c
> +++ b/hw/ppc/spapr_cpu_core.c
> @@ -33,6 +33,7 @@ static void spapr_cpu_reset(void *opaque)
>      PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
>      SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
>      target_ulong lpcr;
> +    SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
>  
>      cpu_reset(cs);
>  
> @@ -77,9 +78,11 @@ static void spapr_cpu_reset(void *opaque)
>      spapr_cpu->dtl_addr = 0;
>      spapr_cpu->dtl_size = 0;
>  
> -    spapr_caps_cpu_apply(SPAPR_MACHINE(qdev_get_machine()), cpu);
> +    spapr_caps_cpu_apply(spapr, cpu);
>  
>      kvm_check_mmu(cpu, &error_fatal);
> +
> +    spapr_irq_cpu_intc_reset(spapr, cpu);
>  }
>  
>  void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, 
> target_ulong r3)
> @@ -234,13 +237,16 @@ static void spapr_realize_vcpu(PowerPCCPU *cpu, 
> SpaprMachineState *spapr,
>      cpu_ppc_set_vhyp(cpu, PPC_VIRTUAL_HYPERVISOR(spapr));
>      kvmppc_set_papr(cpu);
>  
> -    qemu_register_reset(spapr_cpu_reset, cpu);
> -    spapr_cpu_reset(cpu);
> -
>      if (spapr_irq_cpu_intc_create(spapr, cpu, &local_err) < 0) {
>          goto error_unregister;

We no longer need to call qemu_unregister_reset() on rollback then.
Maybe rename the label as well.

>      }
>  
> +    /*
> +     * Hot-plugged CPUs are not reseted. Do it here.
> +     */
> +    qemu_register_reset(spapr_cpu_reset, cpu);
> +    spapr_cpu_reset(cpu);
> +
>      if (!sc->pre_3_0_migration) {
>          vmstate_register(NULL, cs->cpu_index, &vmstate_spapr_cpu_state,
>                           cpu->machine_data);
> diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
> index 234d1073e518..b941608b69ba 100644
> --- a/hw/ppc/spapr_irq.c
> +++ b/hw/ppc/spapr_irq.c
> @@ -220,6 +220,20 @@ int spapr_irq_cpu_intc_create(SpaprMachineState *spapr,
>      return 0;
>  }
>  
> +void spapr_irq_cpu_intc_reset(SpaprMachineState *spapr, PowerPCCPU *cpu)
> +{
> +    SpaprInterruptController *intcs[] = ALL_INTCS(spapr);
> +    int i;
> +
> +    for (i = 0; i < ARRAY_SIZE(intcs); i++) {
> +        SpaprInterruptController *intc = intcs[i];
> +        if (intc) {
> +            SpaprInterruptControllerClass *sicc = SPAPR_INTC_GET_CLASS(intc);
> +            sicc->cpu_intc_reset(intc, cpu);
> +        }
> +    }
> +}
> +
>  static void spapr_set_irq(void *opaque, int irq, int level)
>  {
>      SpaprMachineState *spapr = SPAPR_MACHINE(opaque);




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