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Re: [Qemu-devel] [Qemu-ppc] [PATCH v4 3/9] ppc/xics: Make the ICSState a


From: Cédric Le Goater
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH v4 3/9] ppc/xics: Make the ICSState a list
Date: Mon, 19 Sep 2016 08:59:41 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

On 09/19/2016 08:29 AM, Nikunj A Dadhania wrote:
> From: Benjamin Herrenschmidt <address@hidden>
> 
> Instead of an array of fixed sized blocks, use a list, as we will need
> to have sources with variable number of interrupts. SPAPR only uses
> a single entry. Native will create more. If performance becomes an
> issue we can add some hashed lookup but for now this will do fine.
> 
> Signed-off-by: Benjamin Herrenschmidt <address@hidden>
> [ move the initialization of list to xics_common_initfn,
>   restore xirr_owner after migration and move restoring to
>   icp_post_load]
> Signed-off-by: Nikunj A Dadhania <address@hidden>

This looks good to me apart from the change of icp_post_load(). 

> ---
>  hw/intc/trace-events  |   5 +-
>  hw/intc/xics.c        | 130 
> ++++++++++++++++++++++++++++++++------------------
>  hw/intc/xics_kvm.c    |  27 +++++++----
>  hw/intc/xics_spapr.c  |  88 ++++++++++++++++++++++------------
>  hw/ppc/spapr_events.c |   2 +-
>  hw/ppc/spapr_pci.c    |   5 +-
>  hw/ppc/spapr_vio.c    |   2 +-
>  include/hw/ppc/xics.h |  13 ++---
>  8 files changed, 173 insertions(+), 99 deletions(-)
> 
> diff --git a/hw/intc/trace-events b/hw/intc/trace-events
> index f12192c..aa342a8 100644
> --- a/hw/intc/trace-events
> +++ b/hw/intc/trace-events
> @@ -56,10 +56,11 @@ xics_set_irq_lsi(int srcno, int nr) "set_irq_lsi: srcno 
> %d [irq %#x]"
>  xics_ics_write_xive(int nr, int srcno, int server, uint8_t priority) 
> "ics_write_xive: irq %#x [src %d] server %#x prio %#x"
>  xics_ics_reject(int nr, int srcno) "reject irq %#x [src %d]"
>  xics_ics_eoi(int nr) "ics_eoi: irq %#x"
> -xics_alloc(int src, int irq) "source#%d, irq %d"
> -xics_alloc_block(int src, int first, int num, bool lsi, int align) 
> "source#%d, first irq %d, %d irqs, lsi=%d, alignnum %d"
> +xics_alloc(int irq) "irq %d"
> +xics_alloc_block(int first, int num, bool lsi, int align) "first irq %d, %d 
> irqs, lsi=%d, alignnum %d"
>  xics_ics_free(int src, int irq, int num) "Source#%d, first irq %d, %d irqs"
>  xics_ics_free_warn(int src, int irq) "Source#%d, irq %d is already free"
> +xics_icp_post_load(uint32_t server_no, uint32_t xirr, uint64_t addr, uint8_t 
> pend) "server_no %d, xirr %#x, xirr_owner 0x%" PRIx64 ", pending %d"
>  
>  # hw/intc/s390_flic_kvm.c
>  flic_create_device(int err) "flic: create device failed %d"
> diff --git a/hw/intc/xics.c b/hw/intc/xics.c
> index f765b08..05e938f 100644
> --- a/hw/intc/xics.c
> +++ b/hw/intc/xics.c
> @@ -32,6 +32,7 @@
>  #include "hw/hw.h"
>  #include "trace.h"
>  #include "qemu/timer.h"
> +#include "hw/ppc/spapr.h"
>  #include "hw/ppc/xics.h"
>  #include "qemu/error-report.h"
>  #include "qapi/visitor.h"
> @@ -96,13 +97,16 @@ void xics_cpu_setup(XICSState *xics, PowerPCCPU *cpu)
>  static void xics_common_reset(DeviceState *d)
>  {
>      XICSState *xics = XICS_COMMON(d);
> +    ICSState *ics;
>      int i;
>  
>      for (i = 0; i < xics->nr_servers; i++) {
>          device_reset(DEVICE(&xics->ss[i]));
>      }
>  
> -    device_reset(DEVICE(xics->ics));
> +    QLIST_FOREACH(ics, &xics->ics, list) {
> +        device_reset(DEVICE(ics));
> +    }
>  }
>  
>  static void xics_prop_get_nr_irqs(Object *obj, Visitor *v, const char *name,
> @@ -134,7 +138,6 @@ static void xics_prop_set_nr_irqs(Object *obj, Visitor 
> *v, const char *name,
>      }
>  
>      assert(info->set_nr_irqs);
> -    assert(xics->ics);
>      info->set_nr_irqs(xics, value, errp);
>  }
>  
> @@ -174,6 +177,9 @@ static void xics_prop_set_nr_servers(Object *obj, Visitor 
> *v,
>  
>  static void xics_common_initfn(Object *obj)
>  {
> +    XICSState *xics = XICS_COMMON(obj);
> +
> +    QLIST_INIT(&xics->ics);
>      object_property_add(obj, "nr_irqs", "int",
>                          xics_prop_get_nr_irqs, xics_prop_set_nr_irqs,
>                          NULL, NULL, NULL);
> @@ -212,33 +218,35 @@ static void ics_reject(ICSState *ics, int nr);
>  static void ics_resend(ICSState *ics, int server);
>  static void ics_eoi(ICSState *ics, int nr);
>  
> -static void icp_check_ipi(XICSState *xics, int server)
> +static void icp_check_ipi(ICPState *ss)
>  {
> -    ICPState *ss = xics->ss + server;
> -
>      if (XISR(ss) && (ss->pending_priority <= ss->mfrr)) {
>          return;
>      }
>  
> -    trace_xics_icp_check_ipi(server, ss->mfrr);
> +    trace_xics_icp_check_ipi(ss->cs->cpu_index, ss->mfrr);
>  
> -    if (XISR(ss)) {
> -        ics_reject(xics->ics, XISR(ss));
> +    if (XISR(ss) && ss->xirr_owner) {
> +        ics_reject(ss->xirr_owner, XISR(ss));
>      }
>  
>      ss->xirr = (ss->xirr & ~XISR_MASK) | XICS_IPI;
>      ss->pending_priority = ss->mfrr;
> +    ss->xirr_owner = NULL;
>      qemu_irq_raise(ss->output);
>  }
>  
>  static void icp_resend(XICSState *xics, int server)
>  {
>      ICPState *ss = xics->ss + server;
> +    ICSState *ics;
>  
>      if (ss->mfrr < CPPR(ss)) {
> -        icp_check_ipi(xics, server);
> +        icp_check_ipi(ss);
> +    }
> +    QLIST_FOREACH(ics, &xics->ics, list) {
> +        ics_resend(ics, server);
>      }
> -    ics_resend(xics->ics, server);
>  }
>  
>  void icp_set_cppr(XICSState *xics, int server, uint8_t cppr)
> @@ -256,7 +264,10 @@ void icp_set_cppr(XICSState *xics, int server, uint8_t 
> cppr)
>              ss->xirr &= ~XISR_MASK; /* Clear XISR */
>              ss->pending_priority = 0xff;
>              qemu_irq_lower(ss->output);
> -            ics_reject(xics->ics, old_xisr);
> +            if (ss->xirr_owner) {
> +                ics_reject(ss->xirr_owner, old_xisr);
> +                ss->xirr_owner = NULL;
> +            }
>          }
>      } else {
>          if (!XISR(ss)) {
> @@ -271,7 +282,7 @@ void icp_set_mfrr(XICSState *xics, int server, uint8_t 
> mfrr)
>  
>      ss->mfrr = mfrr;
>      if (mfrr < CPPR(ss)) {
> -        icp_check_ipi(xics, server);
> +        icp_check_ipi(ss);
>      }
>  }
>  
> @@ -282,6 +293,7 @@ uint32_t icp_accept(ICPState *ss)
>      qemu_irq_lower(ss->output);
>      ss->xirr = ss->pending_priority << 24;
>      ss->pending_priority = 0xff;
> +    ss->xirr_owner = NULL;
>  
>      trace_xics_icp_accept(xirr, ss->xirr);
>  
> @@ -299,30 +311,40 @@ uint32_t icp_ipoll(ICPState *ss, uint32_t *mfrr)
>  void icp_eoi(XICSState *xics, int server, uint32_t xirr)
>  {
>      ICPState *ss = xics->ss + server;
> +    ICSState *ics;
> +    uint32_t irq;
>  
>      /* Send EOI -> ICS */
>      ss->xirr = (ss->xirr & ~CPPR_MASK) | (xirr & CPPR_MASK);
>      trace_xics_icp_eoi(server, xirr, ss->xirr);
> -    ics_eoi(xics->ics, xirr & XISR_MASK);
> +    irq = xirr & XISR_MASK;
> +    QLIST_FOREACH(ics, &xics->ics, list) {
> +        if (ics_valid_irq(ics, irq)) {
> +            ics_eoi(ics, irq);
> +        }
> +    }
>      if (!XISR(ss)) {
>          icp_resend(xics, server);
>      }
>  }
>  
> -static void icp_irq(XICSState *xics, int server, int nr, uint8_t priority)
> +static void icp_irq(ICSState *ics, int server, int nr, uint8_t priority)
>  {
> +    XICSState *xics = ics->xics;
>      ICPState *ss = xics->ss + server;
>  
>      trace_xics_icp_irq(server, nr, priority);
>  
>      if ((priority >= CPPR(ss))
>          || (XISR(ss) && (ss->pending_priority <= priority))) {
> -        ics_reject(xics->ics, nr);
> +        ics_reject(ics, nr);
>      } else {
> -        if (XISR(ss)) {
> -            ics_reject(xics->ics, XISR(ss));
> +        if (XISR(ss) && ss->xirr_owner) {
> +            ics_reject(ss->xirr_owner, XISR(ss));
> +            ss->xirr_owner = NULL;
>          }
>          ss->xirr = (ss->xirr & ~XISR_MASK) | (nr & XISR_MASK);
> +        ss->xirr_owner = ics;
>          ss->pending_priority = priority;
>          trace_xics_icp_raise(ss->xirr, ss->pending_priority);
>          qemu_irq_raise(ss->output);
> @@ -378,12 +400,45 @@ static void icp_reset(DeviceState *dev)
>      qemu_set_irq(icp->output, 0);
>  }
>  
> +static int icp_post_load(ICPState *ss, int version_id)
> +{
> +    sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
> +    XICSState *xics = spapr->xics;
> +    uint32_t irq, i;
> +    static uint32_t server_no;
> +
> +    server_no++;
> +    irq = XISR(ss);
> +    if (!ss->cs || !irq) {
> +        goto icpend;
> +    }
> +
> +    /* Restore the xirr_owner */
> +    ss->xirr_owner = xics_find_source(xics, irq);
> +
> + icpend:
> +    trace_xics_icp_post_load(server_no, ss->xirr, (uint64_t)ss->xirr_owner,
> +                             ss->pending_priority);
> +    if (xics->nr_servers != server_no) {
> +        return 0;
> +    }
> +
> +    /* All the ICPs are processed, now restore all the state */
> +    for (i = 0; i < xics->nr_servers; i++) {
> +        icp_resend(xics, i);
> +    }
> +    server_no = 0;
> +    return 0;
> +}

Is the issue this change is trying to fix related to ICSState becoming 
a list ? If not, It should be in another patch I think.

Thanks,

C. 

>  static void icp_class_init(ObjectClass *klass, void *data)
>  {
>      DeviceClass *dc = DEVICE_CLASS(klass);
> +    ICPStateClass *icpc = ICP_CLASS(klass);
>  
>      dc->reset = icp_reset;
>      dc->vmsd = &vmstate_icp_server;
> +    icpc->post_load = icp_post_load;
>  }
>  
>  static const TypeInfo icp_info = {
> @@ -405,8 +460,7 @@ static void resend_msi(ICSState *ics, int srcno)
>      if (irq->status & XICS_STATUS_REJECTED) {
>          irq->status &= ~XICS_STATUS_REJECTED;
>          if (irq->priority != 0xff) {
> -            icp_irq(ics->xics, irq->server, srcno + ics->offset,
> -                    irq->priority);
> +            icp_irq(ics, irq->server, srcno + ics->offset, irq->priority);
>          }
>      }
>  }
> @@ -419,7 +473,7 @@ static void resend_lsi(ICSState *ics, int srcno)
>          && (irq->status & XICS_STATUS_ASSERTED)
>          && !(irq->status & XICS_STATUS_SENT)) {
>          irq->status |= XICS_STATUS_SENT;
> -        icp_irq(ics->xics, irq->server, srcno + ics->offset, irq->priority);
> +        icp_irq(ics, irq->server, srcno + ics->offset, irq->priority);
>      }
>  }
>  
> @@ -434,7 +488,7 @@ static void set_irq_msi(ICSState *ics, int srcno, int val)
>              irq->status |= XICS_STATUS_MASKED_PENDING;
>              trace_xics_masked_pending();
>          } else  {
> -            icp_irq(ics->xics, irq->server, srcno + ics->offset, 
> irq->priority);
> +            icp_irq(ics, irq->server, srcno + ics->offset, irq->priority);
>          }
>      }
>  }
> @@ -473,7 +527,7 @@ static void write_xive_msi(ICSState *ics, int srcno)
>      }
>  
>      irq->status &= ~XICS_STATUS_MASKED_PENDING;
> -    icp_irq(ics->xics, irq->server, srcno + ics->offset, irq->priority);
> +    icp_irq(ics, irq->server, srcno + ics->offset, irq->priority);
>  }
>  
>  static void write_xive_lsi(ICSState *ics, int srcno)
> @@ -568,17 +622,6 @@ static void ics_reset(DeviceState *dev)
>      }
>  }
>  
> -static int ics_post_load(ICSState *ics, int version_id)
> -{
> -    int i;
> -
> -    for (i = 0; i < ics->xics->nr_servers; i++) {
> -        icp_resend(ics->xics, i);
> -    }
> -
> -    return 0;
> -}
> -
>  static void ics_dispatch_pre_save(void *opaque)
>  {
>      ICSState *ics = opaque;
> @@ -653,12 +696,10 @@ static void ics_realize(DeviceState *dev, Error **errp)
>  static void ics_class_init(ObjectClass *klass, void *data)
>  {
>      DeviceClass *dc = DEVICE_CLASS(klass);
> -    ICSStateClass *isc = ICS_CLASS(klass);
>  
>      dc->realize = ics_realize;
>      dc->vmsd = &vmstate_ics;
>      dc->reset = ics_reset;
> -    isc->post_load = ics_post_load;
>  }
>  
>  static const TypeInfo ics_info = {
> @@ -673,28 +714,23 @@ static const TypeInfo ics_info = {
>  /*
>   * Exported functions
>   */
> -int xics_find_source(XICSState *xics, int irq)
> +ICSState *xics_find_source(XICSState *xics, int irq)
>  {
> -    int sources = 1;
> -    int src;
> +    ICSState *ics;
>  
> -    /* FIXME: implement multiple sources */
> -    for (src = 0; src < sources; ++src) {
> -        ICSState *ics = &xics->ics[src];
> +    QLIST_FOREACH(ics, &xics->ics, list) {
>          if (ics_valid_irq(ics, irq)) {
> -            return src;
> +            return ics;
>          }
>      }
> -
> -    return -1;
> +    return NULL;
>  }
>  
>  qemu_irq xics_get_qirq(XICSState *xics, int irq)
>  {
> -    int src = xics_find_source(xics, irq);
> +    ICSState *ics = xics_find_source(xics, irq);
>  
> -    if (src >= 0) {
> -        ICSState *ics = &xics->ics[src];
> +    if (ics) {
>          return ics->qirqs[irq - ics->offset];
>      }
>  
> diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
> index edbd62f..04fa7cb 100644
> --- a/hw/intc/xics_kvm.c
> +++ b/hw/intc/xics_kvm.c
> @@ -365,7 +365,13 @@ static void xics_kvm_cpu_setup(XICSState *xics, 
> PowerPCCPU *cpu)
>  static void xics_kvm_set_nr_irqs(XICSState *xics, uint32_t nr_irqs,
>                                   Error **errp)
>  {
> -    xics->nr_irqs = xics->ics->nr_irqs = nr_irqs;
> +    ICSState *ics = QLIST_FIRST(&xics->ics);
> +
> +    /* This needs to be deprecated ... */
> +    xics->nr_irqs = nr_irqs;
> +    if (ics) {
> +        ics->nr_irqs = nr_irqs;
> +    }
>  }
>  
>  static void xics_kvm_set_nr_servers(XICSState *xics, uint32_t nr_servers,
> @@ -398,6 +404,7 @@ static void xics_kvm_realize(DeviceState *dev, Error 
> **errp)
>  {
>      KVMXICSState *xicskvm = XICS_SPAPR_KVM(dev);
>      XICSState *xics = XICS_COMMON(dev);
> +    ICSState *ics;
>      int i, rc;
>      Error *error = NULL;
>      struct kvm_create_device xics_create_device = {
> @@ -449,10 +456,12 @@ static void xics_kvm_realize(DeviceState *dev, Error 
> **errp)
>  
>      xicskvm->kernel_xics_fd = xics_create_device.fd;
>  
> -    object_property_set_bool(OBJECT(xics->ics), true, "realized", &error);
> -    if (error) {
> -        error_propagate(errp, error);
> -        goto fail;
> +    QLIST_FOREACH(ics, &xics->ics, list) {
> +        object_property_set_bool(OBJECT(ics), true, "realized", &error);
> +        if (error) {
> +            error_propagate(errp, error);
> +            goto fail;
> +        }
>      }
>  
>      assert(xics->nr_servers);
> @@ -481,10 +490,12 @@ fail:
>  static void xics_kvm_initfn(Object *obj)
>  {
>      XICSState *xics = XICS_COMMON(obj);
> +    ICSState *ics;
>  
> -    xics->ics = ICS(object_new(TYPE_KVM_ICS));
> -    object_property_add_child(obj, "ics", OBJECT(xics->ics), NULL);
> -    xics->ics->xics = xics;
> +    ics = ICS(object_new(TYPE_KVM_ICS));
> +    object_property_add_child(obj, "ics", OBJECT(ics), NULL);
> +    ics->xics = xics;
> +    QLIST_INSERT_HEAD(&xics->ics, ics, list);
>  }
>  
>  static void xics_kvm_class_init(ObjectClass *oc, void *data)
> diff --git a/hw/intc/xics_spapr.c b/hw/intc/xics_spapr.c
> index 618826d..0b0845d 100644
> --- a/hw/intc/xics_spapr.c
> +++ b/hw/intc/xics_spapr.c
> @@ -113,13 +113,17 @@ static void rtas_set_xive(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>                            uint32_t nargs, target_ulong args,
>                            uint32_t nret, target_ulong rets)
>  {
> -    ICSState *ics = spapr->xics->ics;
> +    ICSState *ics = QLIST_FIRST(&spapr->xics->ics);
>      uint32_t nr, server, priority;
>  
>      if ((nargs != 3) || (nret != 1)) {
>          rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
>          return;
>      }
> +    if (!ics) {
> +        rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
> +        return;
> +    }
>  
>      nr = rtas_ld(args, 0);
>      server = xics_get_cpu_index_by_dt_id(rtas_ld(args, 1));
> @@ -141,13 +145,17 @@ static void rtas_get_xive(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>                            uint32_t nargs, target_ulong args,
>                            uint32_t nret, target_ulong rets)
>  {
> -    ICSState *ics = spapr->xics->ics;
> +    ICSState *ics = QLIST_FIRST(&spapr->xics->ics);
>      uint32_t nr;
>  
>      if ((nargs != 1) || (nret != 3)) {
>          rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
>          return;
>      }
> +    if (!ics) {
> +        rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
> +        return;
> +    }
>  
>      nr = rtas_ld(args, 0);
>  
> @@ -166,13 +174,17 @@ static void rtas_int_off(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>                           uint32_t nargs, target_ulong args,
>                           uint32_t nret, target_ulong rets)
>  {
> -    ICSState *ics = spapr->xics->ics;
> +    ICSState *ics = QLIST_FIRST(&spapr->xics->ics);
>      uint32_t nr;
>  
>      if ((nargs != 1) || (nret != 1)) {
>          rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
>          return;
>      }
> +    if (!ics) {
> +        rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
> +        return;
> +    }
>  
>      nr = rtas_ld(args, 0);
>  
> @@ -192,13 +204,17 @@ static void rtas_int_on(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>                          uint32_t nargs, target_ulong args,
>                          uint32_t nret, target_ulong rets)
>  {
> -    ICSState *ics = spapr->xics->ics;
> +    ICSState *ics = QLIST_FIRST(&spapr->xics->ics);
>      uint32_t nr;
>  
>      if ((nargs != 1) || (nret != 1)) {
>          rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
>          return;
>      }
> +    if (!ics) {
> +        rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
> +        return;
> +    }
>  
>      nr = rtas_ld(args, 0);
>  
> @@ -217,7 +233,13 @@ static void rtas_int_on(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>  static void xics_spapr_set_nr_irqs(XICSState *xics, uint32_t nr_irqs,
>                                     Error **errp)
>  {
> -    xics->nr_irqs = xics->ics->nr_irqs = nr_irqs;
> +    ICSState *ics = QLIST_FIRST(&xics->ics);
> +
> +    /* This needs to be deprecated ... */
> +    xics->nr_irqs = nr_irqs;
> +    if (ics) {
> +        ics->nr_irqs = nr_irqs;
> +    }
>  }
>  
>  static void xics_spapr_set_nr_servers(XICSState *xics, uint32_t nr_servers,
> @@ -240,6 +262,7 @@ static void xics_spapr_set_nr_servers(XICSState *xics, 
> uint32_t nr_servers,
>  static void xics_spapr_realize(DeviceState *dev, Error **errp)
>  {
>      XICSState *xics = XICS_SPAPR(dev);
> +    ICSState *ics;
>      Error *error = NULL;
>      int i;
>  
> @@ -261,10 +284,12 @@ static void xics_spapr_realize(DeviceState *dev, Error 
> **errp)
>      spapr_register_hypercall(H_EOI, h_eoi);
>      spapr_register_hypercall(H_IPOLL, h_ipoll);
>  
> -    object_property_set_bool(OBJECT(xics->ics), true, "realized", &error);
> -    if (error) {
> -        error_propagate(errp, error);
> -        return;
> +    QLIST_FOREACH(ics, &xics->ics, list) {
> +        object_property_set_bool(OBJECT(ics), true, "realized", &error);
> +        if (error) {
> +            error_propagate(errp, error);
> +            return;
> +        }
>      }
>  
>      for (i = 0; i < xics->nr_servers; i++) {
> @@ -280,10 +305,12 @@ static void xics_spapr_realize(DeviceState *dev, Error 
> **errp)
>  static void xics_spapr_initfn(Object *obj)
>  {
>      XICSState *xics = XICS_SPAPR(obj);
> +    ICSState *ics;
>  
> -    xics->ics = ICS(object_new(TYPE_ICS));
> -    object_property_add_child(obj, "ics", OBJECT(xics->ics), NULL);
> -    xics->ics->xics = xics;
> +    ics = ICS(object_new(TYPE_ICS));
> +    object_property_add_child(obj, "ics", OBJECT(ics), NULL);
> +    ics->xics = xics;
> +    QLIST_INSERT_HEAD(&xics->ics, ics, list);
>  }
>  
>  static void xics_spapr_class_init(ObjectClass *oc, void *data)
> @@ -329,14 +356,15 @@ static int ics_find_free_block(ICSState *ics, int num, 
> int alignnum)
>      return -1;
>  }
>  
> -int xics_spapr_alloc(XICSState *xics, int src, int irq_hint, bool lsi,
> -                     Error **errp)
> +int xics_spapr_alloc(XICSState *xics, int irq_hint, bool lsi, Error **errp)
>  {
> -    ICSState *ics = &xics->ics[src];
> +    ICSState *ics = QLIST_FIRST(&xics->ics);
>      int irq;
>  
> +    if (!ics) {
> +        return -1;
> +    }
>      if (irq_hint) {
> -        assert(src == xics_find_source(xics, irq_hint));
>          if (!ICS_IRQ_FREE(ics, irq_hint - ics->offset)) {
>              error_setg(errp, "can't allocate IRQ %d: already in use", 
> irq_hint);
>              return -1;
> @@ -352,7 +380,7 @@ int xics_spapr_alloc(XICSState *xics, int src, int 
> irq_hint, bool lsi,
>      }
>  
>      ics_set_irq_type(ics, irq - ics->offset, lsi);
> -    trace_xics_alloc(src, irq);
> +    trace_xics_alloc(irq);
>  
>      return irq;
>  }
> @@ -361,13 +389,16 @@ int xics_spapr_alloc(XICSState *xics, int src, int 
> irq_hint, bool lsi,
>   * Allocate block of consecutive IRQs, and return the number of the first 
> IRQ in
>   * the block. If align==true, aligns the first IRQ number to num.
>   */
> -int xics_spapr_alloc_block(XICSState *xics, int src, int num, bool lsi,
> -                           bool align, Error **errp)
> +int xics_spapr_alloc_block(XICSState *xics, int num, bool lsi, bool align,
> +                           Error **errp)
>  {
> +    ICSState *ics = QLIST_FIRST(&xics->ics);
>      int i, first = -1;
> -    ICSState *ics = &xics->ics[src];
>  
> -    assert(src == 0);
> +    if (!ics) {
> +        return -1;
> +    }
> +
>      /*
>       * MSIMesage::data is used for storing VIRQ so
>       * it has to be aligned to num to support multiple
> @@ -394,7 +425,7 @@ int xics_spapr_alloc_block(XICSState *xics, int src, int 
> num, bool lsi,
>      }
>      first += ics->offset;
>  
> -    trace_xics_alloc_block(src, first, num, lsi, align);
> +    trace_xics_alloc_block(first, num, lsi, align);
>  
>      return first;
>  }
> @@ -405,7 +436,7 @@ static void ics_free(ICSState *ics, int srcno, int num)
>  
>      for (i = srcno; i < srcno + num; ++i) {
>          if (ICS_IRQ_FREE(ics, i)) {
> -            trace_xics_ics_free_warn(ics - ics->xics->ics, i + ics->offset);
> +            trace_xics_ics_free_warn(0, i + ics->offset);
>          }
>          memset(&ics->irqs[i], 0, sizeof(ICSIRQState));
>      }
> @@ -413,15 +444,10 @@ static void ics_free(ICSState *ics, int srcno, int num)
>  
>  void xics_spapr_free(XICSState *xics, int irq, int num)
>  {
> -    int src = xics_find_source(xics, irq);
> -
> -    if (src >= 0) {
> -        ICSState *ics = &xics->ics[src];
> -
> -        /* FIXME: implement multiple sources */
> -        assert(src == 0);
> +    ICSState *ics = xics_find_source(xics, irq);
>  
> -        trace_xics_ics_free(ics - xics->ics, irq, num);
> +    if (ics) {
> +        trace_xics_ics_free(0, irq, num);
>          ics_free(ics, irq - ics->offset, num);
>      }
>  }
> diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
> index b0668b3..adf8da4 100644
> --- a/hw/ppc/spapr_events.c
> +++ b/hw/ppc/spapr_events.c
> @@ -603,7 +603,7 @@ out_no_events:
>  void spapr_events_init(sPAPRMachineState *spapr)
>  {
>      QTAILQ_INIT(&spapr->pending_events);
> -    spapr->check_exception_irq = xics_spapr_alloc(spapr->xics, 0, 0, false,
> +    spapr->check_exception_irq = xics_spapr_alloc(spapr->xics, 0, false,
>                                              &error_fatal);
>      spapr->epow_notifier.notify = spapr_powerdown_req;
>      qemu_register_powerdown_notifier(&spapr->epow_notifier);
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index 949c44f..4d06794 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -362,7 +362,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>      }
>  
>      /* Allocate MSIs */
> -    irq = xics_spapr_alloc_block(spapr->xics, 0, req_num, false,
> +    irq = xics_spapr_alloc_block(spapr->xics, req_num, false,
>                             ret_intr_type == RTAS_TYPE_MSI, &err);
>      if (err) {
>          error_reportf_err(err, "Can't allocate MSIs for device %x: ",
> @@ -1444,8 +1444,7 @@ static void spapr_phb_realize(DeviceState *dev, Error 
> **errp)
>          uint32_t irq;
>          Error *local_err = NULL;
>  
> -        irq = xics_spapr_alloc_block(spapr->xics, 0, 1, true, false,
> -                                     &local_err);
> +        irq = xics_spapr_alloc_block(spapr->xics, 1, true, false, 
> &local_err);
>          if (local_err) {
>              error_propagate(errp, local_err);
>              error_prepend(errp, "can't allocate LSIs: ");
> diff --git a/hw/ppc/spapr_vio.c b/hw/ppc/spapr_vio.c
> index f93244d..22360af 100644
> --- a/hw/ppc/spapr_vio.c
> +++ b/hw/ppc/spapr_vio.c
> @@ -463,7 +463,7 @@ static void spapr_vio_busdev_realize(DeviceState *qdev, 
> Error **errp)
>          dev->qdev.id = id;
>      }
>  
> -    dev->irq = xics_spapr_alloc(spapr->xics, 0, dev->irq, false, &local_err);
> +    dev->irq = xics_spapr_alloc(spapr->xics, dev->irq, false, &local_err);
>      if (local_err) {
>          error_propagate(errp, local_err);
>          return;
> diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
> index 2db9f93..1ea40bd 100644
> --- a/include/hw/ppc/xics.h
> +++ b/include/hw/ppc/xics.h
> @@ -85,7 +85,7 @@ struct XICSState {
>      uint32_t nr_servers;
>      uint32_t nr_irqs;
>      ICPState *ss;
> -    ICSState *ics;
> +    QLIST_HEAD(, ICSState) ics;
>  };
>  
>  #define TYPE_ICP "icp"
> @@ -111,6 +111,7 @@ struct ICPState {
>      DeviceState parent_obj;
>      /*< public >*/
>      CPUState *cs;
> +    ICSState *xirr_owner;
>      uint32_t xirr;
>      uint8_t pending_priority;
>      uint8_t mfrr;
> @@ -145,6 +146,7 @@ struct ICSState {
>      qemu_irq *qirqs;
>      ICSIRQState *irqs;
>      XICSState *xics;
> +    QLIST_ENTRY(ICSState) list;
>  };
>  
>  static inline bool ics_valid_irq(ICSState *ics, uint32_t nr)
> @@ -172,10 +174,9 @@ struct ICSIRQState {
>  #define XICS_IRQS_SPAPR               1024
>  
>  qemu_irq xics_get_qirq(XICSState *icp, int irq);
> -int xics_spapr_alloc(XICSState *icp, int src, int irq_hint, bool lsi,
> -                     Error **errp);
> -int xics_spapr_alloc_block(XICSState *icp, int src, int num, bool lsi,
> -                           bool align, Error **errp);
> +int xics_spapr_alloc(XICSState *icp, int irq_hint, bool lsi, Error **errp);
> +int xics_spapr_alloc_block(XICSState *icp, int num, bool lsi, bool align,
> +                           Error **errp);
>  void xics_spapr_free(XICSState *icp, int irq, int num);
>  
>  void xics_cpu_setup(XICSState *icp, PowerPCCPU *cpu);
> @@ -195,6 +196,6 @@ void ics_write_xive(ICSState *ics, int nr, int server,
>  
>  void ics_set_irq_type(ICSState *ics, int srcno, bool lsi);
>  
> -int xics_find_source(XICSState *icp, int irq);
> +ICSState *xics_find_source(XICSState *icp, int irq);
>  
>  #endif /* XICS_H */
> 




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