Re: [Qemu-devel] [PATCH 06/11] acpi/ich9: add CPU hotplug handling to Q35 machine

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Dec 13, 2013 at 05:22:11PM +0100, Igor Mammedov wrote:
> .. including readonly 'cpu-hotplug-io-base' property
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>

Is this documented in the Q35 spec? Could not find it there.
If this is our PV code like PIIX, then we need to document this
interface.

> ---
>  hw/acpi/ich9.c         | 27 +++++++++++++++++++++++++++
>  include/hw/acpi/ich9.h |  4 ++++
>  2 files changed, 31 insertions(+)
> 
> diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
> index 30f0df8..9c88109 100644
> --- a/hw/acpi/ich9.c
> +++ b/hw/acpi/ich9.c
> @@ -44,6 +44,8 @@ do { printf("%s "fmt, __func__, ## __VA_ARGS__); } while (0)
>  #define ICH9_DEBUG(fmt, ...)    do { } while (0)
>  #endif
>  
> +#define ICH9_PROC_BASE 0xa18
> +
>  static void ich9_pm_update_sci_fn(ACPIREGS *regs)
>  {
>      ICH9LPCPMRegs *pm = container_of(regs, ICH9LPCPMRegs, acpi_regs);
> @@ -185,6 +187,15 @@ static void pm_powerdown_req(Notifier *n, void *opaque)
>      acpi_pm1_evt_power_down(&pm->acpi_regs);
>  }
>  
> +static void ich9_cpu_added_req(Notifier *n, void *opaque)
> +{
> +    ICH9LPCPMRegs *pm = container_of(n, ICH9LPCPMRegs, cpu_added_notifier);
> +
> +    assert(pm != NULL);
> +    acpi_hotplug_cpu_add(&pm->acpi_regs.gpe, &pm->gpe_cpu, CPU(opaque));
> +    acpi_update_sci(&pm->acpi_regs, pm->irq);
> +}
> +
>  void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
>                    qemu_irq sci_irq)
>  {
> @@ -210,6 +221,11 @@ void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
>      qemu_register_reset(pm_reset, pm);
>      pm->powerdown_notifier.notify = pm_powerdown_req;
>      qemu_register_powerdown_notifier(&pm->powerdown_notifier);
> +
> +    acpi_hotplug_cpu_init(pci_address_space_io(lpc_pci), OBJECT(lpc_pci),
> +                          &pm->gpe_cpu, pm->gpe_cpu.io_base);
> +    pm->cpu_added_notifier.notify = ich9_cpu_added_req;
> +    qemu_register_cpu_added_notifier(&pm->cpu_added_notifier);
>  }
>  
>  static void ich9_pm_get_gpe0_blk(Object *obj, Visitor *v,
> @@ -222,6 +238,14 @@ static void ich9_pm_get_gpe0_blk(Object *obj, Visitor *v,
>      visit_type_uint32(v, &value, name, errp);
>  }
>  
> +static void ich9_pm_get_cpu_io_base(Object *obj, Visitor *v, void *opaque,
> +                                    const char *name, Error **errp)
> +{
> +    ICH9LPCState *s = ICH9_LPC_DEVICE(obj);
> +
> +    visit_type_uint16(v, &s->pm.gpe_cpu.io_base, name, errp);
> +}
> +
>  void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm, Error **errp)
>  {
>      static const uint32_t gpe0_len = ICH9_PMIO_GPE0_LEN;
> @@ -233,4 +257,7 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm, Error **errp)
>                          NULL, NULL, pm, NULL);
>      object_property_add_uint32_ptr(obj, ACPI_PM_PROP_GPE0_BLK_LEN,
>                                     &gpe0_len, errp);
> +    pm->gpe_cpu.io_base = ICH9_PROC_BASE;
> +    object_property_add(obj, ACPI_CPU_HOTPLUG_IO_BASE_PROP, "int",
> +                        ich9_pm_get_cpu_io_base, NULL, NULL, NULL, NULL);
>  }
> diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
> index 82fcf9f..c71a9b4 100644
> --- a/include/hw/acpi/ich9.h
> +++ b/include/hw/acpi/ich9.h
> @@ -22,6 +22,7 @@
>  #define HW_ACPI_ICH9_H
>  
>  #include "hw/acpi/acpi.h"
> +#include "hw/acpi/hotplug.h"
>  
>  typedef struct ICH9LPCPMRegs {
>      /*
> @@ -42,6 +43,9 @@ typedef struct ICH9LPCPMRegs {
>  
>      uint32_t pm_io_base;
>      Notifier powerdown_notifier;
> +
> +    AcpiCPUHotplug gpe_cpu;
> +    Notifier cpu_added_notifier;
>  } ICH9LPCPMRegs;
>  
>  void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
> -- 
> 1.8.3.1