Re: [Qemu-devel] [PATCH 20/33] pc: q35: initialize new CPU hotplug hw

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

On Tue, May 31, 2016 at 02:51:03PM +0200, Igor Mammedov wrote:
> On Tue, 31 May 2016 13:21:20 +0300
> Marcel Apfelbaum <marcel@redhat.com> wrote:
> 
> > On 05/31/2016 01:06 PM, Igor Mammedov wrote:
> > > On Mon, 30 May 2016 22:02:31 +0300
> > > Marcel Apfelbaum <marcel@redhat.com> wrote:
> > >  
> > >> On 05/17/2016 05:43 PM, Igor Mammedov wrote:  
> > >>> add necessary wiring to init new CPU hotplug hardware
> > >>> if ICH9-LPC.cpu-hotplug-legacy is "off".
> > >>> Set ICH9-LPC.cpu-hotplug-legacy to "off" by default and
> > >>> switch legacy hotplug to enabled only for 2.6 and older
> > >>> machine types.
> > >>>
> > >>> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > >>> ---
> > >>> v1:
> > >>>     - drop ICH9-LPC.cpu-hotplug property
> > >>> ---
> > >>>    hw/acpi/ich9.c         | 42 +++++++++++++++++++++++++++++++++++++-----
> > >>>    include/hw/acpi/ich9.h |  6 +++++-
> > >>>    include/hw/compat.h    |  6 +++++-
> > >>>    3 files changed, 47 insertions(+), 7 deletions(-)
> > >>>
> > >>> diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
> > >>> index 121e30c..b0285b9 100644
> > >>> --- a/hw/acpi/ich9.c
> > >>> +++ b/hw/acpi/ich9.c
> > >>> @@ -170,6 +170,24 @@ static const VMStateDescription vmstate_memhp_state = {
> > >>>        }
> > >>>    };
> > >>>
> > >>> +static bool vmstate_test_use_cpuhp(void *opaque)
> > >>> +{
> > >>> +    ICH9LPCPMRegs *s = opaque;
> > >>> +    return !s->cpu_hotplug_legacy;
> > >>> +}
> > >>> +
> > >>> +static const VMStateDescription vmstate_cpuhp_state = {
> > >>> +    .name = "ich9_pm/cpuhp",
> > >>> +    .version_id = 1,
> > >>> +    .minimum_version_id = 1,
> > >>> +    .minimum_version_id_old = 1,
> > >>> +    .needed = vmstate_test_use_cpuhp,
> > >>> +    .fields      = (VMStateField[]) {
> > >>> +        VMSTATE_CPU_HOTPLUG(cpuhp.state, ICH9LPCPMRegs),
> > >>> +        VMSTATE_END_OF_LIST()
> > >>> +    }
> > >>> +};
> > >>> +
> > >>>    static bool vmstate_test_use_tco(void *opaque)
> > >>>    {
> > >>>        ICH9LPCPMRegs *s = opaque;
> > >>> @@ -209,6 +227,7 @@ const VMStateDescription vmstate_ich9_pm = {
> > >>>        .subsections = (const VMStateDescription*[]) {
> > >>>            &vmstate_memhp_state,
> > >>>            &vmstate_tco_io_state,
> > >>> +        &vmstate_cpuhp_state,
> > >>>            NULL
> > >>>        }
> > >>>    };
> > >>> @@ -275,7 +294,10 @@ void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
> > >>>
> > >>>        if (pm->cpu_hotplug_legacy) {
> > >>>            legacy_acpi_cpu_hotplug_init(pci_address_space_io(lpc_pci),
> > >>> -            OBJECT(lpc_pci), &pm->gpe_cpu, ICH9_CPU_HOTPLUG_IO_BASE);
> > >>> +            OBJECT(lpc_pci), &pm->cpuhp.legacy, ICH9_CPU_HOTPLUG_IO_BASE);
> > >>> +    } else {
> > >>> +        cpu_hotplug_hw_init(pci_address_space_io(lpc_pci), OBJECT(lpc_pci),
> > >>> +                            &pm->cpuhp.state, ICH9_CPU_HOTPLUG_IO_BASE);
> > >>>        }
> > >>>
> > >>>        if (pm->acpi_memory_hotplug.is_enabled) {
> > >>> @@ -414,7 +436,6 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm, Error **errp)
> > >>>    {
> > >>>        static const uint32_t gpe0_len = ICH9_PMIO_GPE0_LEN;
> > >>>        pm->acpi_memory_hotplug.is_enabled = true;
> > >>> -    pm->cpu_hotplug_legacy = true;  
> > >>
> > >> Maybe is too soon to disable legacy CPU hotplug? Will the new cpu hotplug mechanism
> > >> work from this patch on, or it will break git bisect?  
> > > it doesn't break bisect compile wise nor 'make check' wise,
> > > but it's hotplug won't be functional till
> > >    acpi: add CPU hotplug methods to DSDT
> > > perhaps I need to move it there or into a separate patch after it.
> > >  
> > 
> > Exactly, I would move the "enabling" code after the new hotplug mechanism
> > is functional. The same for the next patch for piix4.
> ok, will do on v2 respin.

I have everything up to
    pc: use AcpiDeviceIfClass.send_event to issue GPE events
tentatively in my tree - do you plan to rework any of these?

> > 
> > Thanks,
> > Marcel
> > 
> > 
> > >>
> > >> Thanks,
> > >> Marcel
> > >>  
> > >>>        pm->disable_s3 = 0;
> > >>>        pm->disable_s4 = 0;
> > >>>        pm->s4_val = 2;
> > >>> @@ -461,9 +482,13 @@ void ich9_pm_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
> > >>>            object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> > >>>            acpi_memory_plug_cb(hotplug_dev, &lpc->pm.acpi_memory_hotplug,
> > >>>                                dev, errp);
> > >>> -    } else if (lpc->pm.cpu_hotplug_legacy &&
> > >>> -               object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
> > >>> -        legacy_acpi_cpu_plug_cb(hotplug_dev, &lpc->pm.gpe_cpu, dev, errp);
> > >>> +    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
> > >>> +        if (lpc->pm.cpu_hotplug_legacy) {
> > >>> +            legacy_acpi_cpu_plug_cb(hotplug_dev, &lpc->pm.cpuhp.legacy, dev,
> > >>> +                                    errp);
> > >>> +        } else {
> > >>> +            acpi_cpu_plug_cb(hotplug_dev, &lpc->pm.cpuhp.state, dev, errp);
> > >>> +        }
> > >>>        } else {
> > >>>            error_setg(errp, "acpi: device plug request for not supported device"
> > >>>                       " type: %s", object_get_typename(OBJECT(dev)));
> > >>> @@ -480,6 +505,10 @@ void ich9_pm_device_unplug_request_cb(HotplugHandler *hotplug_dev,
> > >>>            acpi_memory_unplug_request_cb(hotplug_dev,
> > >>>                                          &lpc->pm.acpi_memory_hotplug, dev,
> > >>>                                          errp);
> > >>> +    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
> > >>> +               !lpc->pm.cpu_hotplug_legacy) {
> > >>> +        acpi_cpu_unplug_request_cb(hotplug_dev, &lpc->pm.cpuhp.state,
> > >>> +                                   dev, errp);
> > >>>        } else {
> > >>>            error_setg(errp, "acpi: device unplug request for not supported device"
> > >>>                       " type: %s", object_get_typename(OBJECT(dev)));
> > >>> @@ -494,6 +523,9 @@ void ich9_pm_device_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
> > >>>        if (lpc->pm.acpi_memory_hotplug.is_enabled &&
> > >>>            object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> > >>>            acpi_memory_unplug_cb(&lpc->pm.acpi_memory_hotplug, dev, errp);
> > >>> +    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
> > >>> +               !lpc->pm.cpu_hotplug_legacy) {
> > >>> +        acpi_cpu_unplug_cb(&lpc->pm.cpuhp.state, dev, errp);
> > >>>        } else {
> > >>>            error_setg(errp, "acpi: device unplug for not supported device"
> > >>>                       " type: %s", object_get_typename(OBJECT(dev)));
> > >>> diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
> > >>> index e29a856..198c017 100644
> > >>> --- a/include/hw/acpi/ich9.h
> > >>> +++ b/include/hw/acpi/ich9.h
> > >>> @@ -23,6 +23,7 @@
> > >>>
> > >>>    #include "hw/acpi/acpi.h"
> > >>>    #include "hw/acpi/cpu_hotplug.h"
> > >>> +#include "hw/acpi/cpu.h"
> > >>>    #include "hw/acpi/memory_hotplug.h"
> > >>>    #include "hw/acpi/acpi_dev_interface.h"
> > >>>    #include "hw/acpi/tco.h"
> > >>> @@ -49,7 +50,10 @@ typedef struct ICH9LPCPMRegs {
> > >>>        Notifier powerdown_notifier;
> > >>>
> > >>>        bool cpu_hotplug_legacy;
> > >>> -    AcpiCpuHotplug gpe_cpu;
> > >>> +    union {
> > >>> +        AcpiCpuHotplug legacy; /* used for keeping legacy state */
> > >>> +        CPUHotplugState state;
> > >>> +    } cpuhp;
> > >>>
> > >>>        MemHotplugState acpi_memory_hotplug;
> > >>>
> > >>> diff --git a/include/hw/compat.h b/include/hw/compat.h
> > >>> index 636befe..a65d9d2 100644
> > >>> --- a/include/hw/compat.h
> > >>> +++ b/include/hw/compat.h
> > >>> @@ -2,7 +2,11 @@
> > >>>    #define HW_COMPAT_H
> > >>>
> > >>>    #define HW_COMPAT_2_6 \
> > >>> -    /* empty */
> > >>> +    {\
> > >>> +        .driver   = "ICH9-LPC",\
> > >>> +        .property = "cpu-hotplug-legacy",\
> > >>> +        .value    = "on",\
> > >>> +    },\
> > >>>
> > >>>    #define HW_COMPAT_2_5 \
> > >>>        {\
> > >>>  
> > >>  
> > >  
> >