Re: [PATCH 3/5] hw/arm/virt: Add nvdimm hot-plug infrastructure

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 4 Oct 2019 16:53:00 +0100
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> wrote:

> From: Kwangwoo Lee <kwangwoo.lee@sk.com>
> 
> Pre-plug and plug handlers are prepared for NVDIMM support.

Prepare pre-plug and plug handlers for NVDIMM support.

> Please note nvdimm_support is not yet enabled.
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Signed-off-by: Kwangwoo Lee <kwangwoo.lee@sk.com>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> ---
>  hw/arm/Kconfig           |  1 +
>  hw/arm/virt-acpi-build.c |  6 ++++++
>  hw/arm/virt.c            | 22 +++++++++++++++++++++-
>  hw/mem/Kconfig           |  2 +-
>  include/hw/arm/virt.h    |  1 +
>  5 files changed, 30 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
> index c6e7782580..851dd81289 100644
> --- a/hw/arm/Kconfig
> +++ b/hw/arm/Kconfig
> @@ -24,6 +24,7 @@ config ARM_VIRT
>      select DIMM
>      select ACPI_MEMORY_HOTPLUG
>      select ACPI_HW_REDUCED
> +    select ACPI_NVDIMM
>  
>  config CHEETAH
>      bool
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index 074e0c858e..4e63f5da48 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -44,6 +44,7 @@
>  #include "hw/pci/pcie_host.h"
>  #include "hw/pci/pci.h"
>  #include "hw/arm/virt.h"
> +#include "hw/mem/nvdimm.h"
>  #include "sysemu/numa.h"
>  #include "sysemu/reset.h"
>  #include "kvm_arm.h"
> @@ -835,6 +836,11 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
>          }
>      }
>  
> +    if (ms->nvdimms_state->is_enabled) {
> +        nvdimm_build_acpi(table_offsets, tables_blob, tables->linker,
> +                          ms->nvdimms_state, ms->ram_slots);
> +    }
> +
>      if (its_class_name() && !vmc->no_its) {
>          acpi_add_table(table_offsets, tables_blob);
>          build_iort(tables_blob, tables->linker, vms);
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index d4bedc2607..30bc8a7803 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -143,6 +143,7 @@ static const MemMapEntry base_memmap[] = {
>      [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
>      [VIRT_PCDIMM_ACPI] =        { 0x09070000, MEMORY_HOTPLUG_IO_LEN },
>      [VIRT_ACPI_GED] =           { 0x09080000, ACPI_GED_EVT_SEL_LEN },
> +    [VIRT_NVDIMM_ACPI] =        { 0x09090000, NVDIMM_ACPI_IO_LEN},
>      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
>      [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
> @@ -1750,6 +1751,18 @@ static void machvirt_init(MachineState *machine)
>  
>      create_platform_bus(vms, pic);
>  
> +    if (machine->nvdimms_state->is_enabled) {
> +        const struct AcpiGenericAddress arm_virt_nvdimm_acpi_dsmio = {
> +            .space_id = AML_AS_SYSTEM_MEMORY,
> +            .address = vms->memmap[VIRT_NVDIMM_ACPI].base,
> +            .bit_width = NVDIMM_ACPI_IO_LEN << 3
> +        };
> +
> +        nvdimm_init_acpi_state(machine->nvdimms_state, sysmem,
> +                               arm_virt_nvdimm_acpi_dsmio,
> +                               vms->fw_cfg, OBJECT(vms));
> +    }
> +
>      vms->bootinfo.ram_size = machine->ram_size;
>      vms->bootinfo.nb_cpus = smp_cpus;
>      vms->bootinfo.board_id = -1;
> @@ -1916,9 +1929,10 @@ static void virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
>                                   Error **errp)
>  {
>      VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> +    MachineState *ms = MACHINE(hotplug_dev);
>      const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
>  
> -    if (is_nvdimm) {
> +    if (is_nvdimm && (!ms->nvdimms_state->is_enabled)) {
shouldn't shouldn't this hunk go to 5/5 where functionality is eventually
enabled and use the same error message as in pc_memory_pre_plug()

>          error_setg(errp, "nvdimm is not yet supported");
>          return;
>      }
> @@ -1937,6 +1951,8 @@ static void virt_memory_plug(HotplugHandler *hotplug_dev,
>  {
>      HotplugHandlerClass *hhc;
>      VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> +    MachineState *ms = MACHINE(hotplug_dev);
> +    bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
>      Error *local_err = NULL;
>  
>      pc_dimm_plug(PC_DIMM(dev), MACHINE(vms), &local_err);
> @@ -1944,6 +1960,10 @@ static void virt_memory_plug(HotplugHandler *hotplug_dev,
>          goto out;
>      }
>  
> +    if (is_nvdimm) {
> +        nvdimm_plug(ms->nvdimms_state);
> +    }
> +
>      hhc = HOTPLUG_HANDLER_GET_CLASS(vms->acpi_dev);
>      hhc->plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &error_abort);
>  out:
> diff --git a/hw/mem/Kconfig b/hw/mem/Kconfig
> index 620fd4cb59..0d5f8f321a 100644
> --- a/hw/mem/Kconfig
> +++ b/hw/mem/Kconfig
> @@ -8,4 +8,4 @@ config MEM_DEVICE
>  config NVDIMM
>      bool
>      default y
> -    depends on PC
> +    depends on PC || ARM_VIRT
> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
> index 0b41083e9d..06d5e75611 100644
> --- a/include/hw/arm/virt.h
> +++ b/include/hw/arm/virt.h
> @@ -79,6 +79,7 @@ enum {
>      VIRT_SECURE_MEM,
>      VIRT_PCDIMM_ACPI,
>      VIRT_ACPI_GED,
> +    VIRT_NVDIMM_ACPI,
>      VIRT_LOWMEMMAP_LAST,
>  };
>