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Re: [Qemu-devel] [PATCH v3 05/10] hw/arm/virt: Add ACPI support for devi


From: Auger Eric
Subject: Re: [Qemu-devel] [PATCH v3 05/10] hw/arm/virt: Add ACPI support for device memory cold-plug
Date: Fri, 29 Mar 2019 10:31:14 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

Hi Shameer,

On 3/21/19 11:47 AM, Shameer Kolothum wrote:
> This adds support to build the aml code so that Guest(ACPI boot)
> can see the cold-plugged device memory. Memory cold plug support
> with DT boot is not yet enabled.
> 
> Signed-off-by: Shameer Kolothum <address@hidden>
> ---
>  default-configs/arm-softmmu.mak        |  2 ++
>  hw/acpi/generic_event_device.c         | 23 +++++++++++++++++++++++
>  hw/arm/virt-acpi-build.c               |  9 +++++++++
>  hw/arm/virt.c                          | 23 +++++++++++++++++++++++
>  include/hw/acpi/generic_event_device.h |  5 +++++
>  include/hw/arm/virt.h                  |  2 ++
>  6 files changed, 64 insertions(+)
> 
> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
> index 795cb89..6db444e 100644
> --- a/default-configs/arm-softmmu.mak
> +++ b/default-configs/arm-softmmu.mak
> @@ -162,3 +162,5 @@ CONFIG_LSI_SCSI_PCI=y
>  
>  CONFIG_MEM_DEVICE=y
>  CONFIG_DIMM=y
> +CONFIG_ACPI_MEMORY_HOTPLUG=y
> +CONFIG_ACPI_HW_REDUCED=y
> diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> index b21a551..0b32fc9 100644
> --- a/hw/acpi/generic_event_device.c
> +++ b/hw/acpi/generic_event_device.c
> @@ -16,13 +16,26 @@
>   */
>  
>  #include "qemu/osdep.h"
> +#include "qapi/error.h"
> +#include "exec/address-spaces.h"
>  #include "hw/sysbus.h"
>  #include "hw/acpi/acpi.h"
>  #include "hw/acpi/generic_event_device.h"
> +#include "hw/mem/pc-dimm.h"
>  
>  static void virt_device_plug_cb(HotplugHandler *hotplug_dev,
>                                  DeviceState *dev, Error **errp)
>  {
> +    VirtAcpiState *s = VIRT_ACPI(hotplug_dev);
> +
> +    if (s->memhp_state.is_enabled &&
> +        object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> +            acpi_memory_plug_cb(hotplug_dev, &s->memhp_state,
> +                                dev, errp);
> +    } else {
> +        error_setg(errp, "virt: device plug request for unsupported device"
> +                   " type: %s", object_get_typename(OBJECT(dev)));
> +    }
>  }
>  
>  static void virt_send_ged(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
> @@ -31,9 +44,19 @@ static void virt_send_ged(AcpiDeviceIf *adev, 
> AcpiEventStatusBits ev)
>  
>  static void virt_device_realize(DeviceState *dev, Error **errp)
>  {
> +    VirtAcpiState *s = VIRT_ACPI(dev);
> +
> +    if (s->memhp_state.is_enabled) {
> +        acpi_memory_hotplug_init(get_system_memory(), OBJECT(dev),
> +                                 &s->memhp_state,
> +                                 s->memhp_base);
> +    }
>  }
>  
>  static Property virt_acpi_properties[] = {
> +    DEFINE_PROP_UINT64("memhp_base", VirtAcpiState, memhp_base, 0),
> +    DEFINE_PROP_BOOL("memory-hotplug-support", VirtAcpiState,
> +                     memhp_state.is_enabled, true),>      
> DEFINE_PROP_END_OF_LIST(),
>  };
>  
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index bf9c0bc..20d3c83 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -40,6 +40,7 @@
>  #include "hw/loader.h"
>  #include "hw/hw.h"
>  #include "hw/acpi/aml-build.h"
> +#include "hw/acpi/memory_hotplug.h"
>  #include "hw/pci/pcie_host.h"
>  #include "hw/pci/pci.h"
>  #include "hw/arm/virt.h"
> @@ -49,6 +50,13 @@
>  #define ARM_SPI_BASE 32
>  #define ACPI_POWER_BUTTON_DEVICE "PWRB"
>  
> +static void acpi_dsdt_add_memory_hotplug(Aml *scope, MachineState *ms)
> +{
> +    uint32_t nr_mem = ms->ram_slots;
> +
> +    build_memory_hotplug_aml(scope, nr_mem, "\\_SB", NULL, 
> AML_SYSTEM_MEMORY);
> +}
> +
>  static void acpi_dsdt_add_cpus(Aml *scope, int smp_cpus)
>  {
>      uint16_t i;
> @@ -740,6 +748,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, 
> VirtMachineState *vms)
>       * the RTC ACPI device at all when using UEFI.
>       */
>      scope = aml_scope("\\_SB");
> +    acpi_dsdt_add_memory_hotplug(scope, MACHINE(vms));
>      acpi_dsdt_add_cpus(scope, vms->smp_cpus);
>      acpi_dsdt_add_uart(scope, &memmap[VIRT_UART],
>                         (irqmap[VIRT_UART] + ARM_SPI_BASE));
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index d0ff20d..13db0e9 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -133,6 +133,7 @@ static const MemMapEntry base_memmap[] = {
>      [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
>      [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
>      [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
> +    [VIRT_PCDIMM_ACPI] =        { 0x09070000, 0x00010000 },
>      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size 
> */
>      [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
> @@ -516,6 +517,18 @@ static void fdt_add_pmu_nodes(const VirtMachineState 
> *vms)
>      }
>  }
>  
> +static DeviceState *create_virt_acpi(VirtMachineState *vms)
> +{
> +    DeviceState *dev;
> +
> +    dev = qdev_create(NULL, "virt-acpi");
> +    qdev_prop_set_uint64(dev, "memhp_base",
> +                         vms->memmap[VIRT_PCDIMM_ACPI].base);
Maybe add a comment that a property is requested to integrated with
acpi_memory_hotplug_init() (if I am not wrong). Otherwise we can wonder
why sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, <base>) is not used as for
standard sysbus devices?

> +    qdev_init_nofail(dev);
> +
> +    return dev;
> +}
> +
>  static void create_its(VirtMachineState *vms, DeviceState *gicdev)
>  {
>      const char *itsclass = its_class_name();
> @@ -1644,6 +1657,8 @@ static void machvirt_init(MachineState *machine)
>  
>      create_platform_bus(vms, pic);
>  
> +    vms->acpi = create_virt_acpi(vms);I can see that on PC machines, they 
> use a link property to set the
acpi_dev. I am unsure about the exact reason, any idea?
> +
>      vms->bootinfo.ram_size = machine->ram_size;
>      vms->bootinfo.kernel_filename = machine->kernel_filename;
>      vms->bootinfo.kernel_cmdline = machine->kernel_cmdline;
> @@ -1828,11 +1843,19 @@ static void virt_memory_pre_plug(HotplugHandler 
> *hotplug_dev, DeviceState *dev,
>  static void virt_memory_plug(HotplugHandler *hotplug_dev,
>                               DeviceState *dev, Error **errp)
>  {
> +    HotplugHandlerClass *hhc;
>      VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
>      Error *local_err = NULL;
>  
>      pc_dimm_plug(PC_DIMM(dev), MACHINE(vms), &local_err);
> +    if (local_err) {
> +        goto out;
> +    }
> +
> +    hhc = HOTPLUG_HANDLER_GET_CLASS(vms->acpi);
> +    hhc->plug(HOTPLUG_HANDLER(vms->acpi), dev, &error_abort);
Why error_abort instead of propagating the error?
>  
> +out:
>      error_propagate(errp, local_err);
>  }
>  
> diff --git a/include/hw/acpi/generic_event_device.h 
> b/include/hw/acpi/generic_event_device.h
> index f314515..262ca7d 100644
> --- a/include/hw/acpi/generic_event_device.h
> +++ b/include/hw/acpi/generic_event_device.h
> @@ -18,12 +18,17 @@
>  #ifndef HW_ACPI_GED_H
>  #define HW_ACPI_GED_H
>  
> +#include "hw/acpi/memory_hotplug.h"
> +
>  #define TYPE_VIRT_ACPI "virt-acpi"
>  #define VIRT_ACPI(obj) \
>      OBJECT_CHECK(VirtAcpiState, (obj), TYPE_VIRT_ACPI)
>  
>  typedef struct VirtAcpiState {
>      SysBusDevice parent_obj;
> +    MemHotplugState memhp_state;
> +    hwaddr memhp_base;
>  } VirtAcpiState;
>  
> +
spurious newline

Thanks

Eric
>  #endif
> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
> index 507517c..c5e4c96 100644
> --- a/include/hw/arm/virt.h
> +++ b/include/hw/arm/virt.h
> @@ -77,6 +77,7 @@ enum {
>      VIRT_GPIO,
>      VIRT_SECURE_UART,
>      VIRT_SECURE_MEM,
> +    VIRT_PCDIMM_ACPI,
>      VIRT_LOWMEMMAP_LAST,
>  };
>  
> @@ -132,6 +133,7 @@ typedef struct {
>      uint32_t iommu_phandle;
>      int psci_conduit;
>      hwaddr highest_gpa;
> +    DeviceState *acpi;
>  } VirtMachineState;
>  
>  #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
> 



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