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[PATCH-for-4.2,v9,06/12] hw/arm/virt: Enable device memory cold/hot plug with ACPI boot

Message ID 20190813210539.31164-7-shameerali.kolothum.thodi@huawei.com
State New
Headers show
Series ARM virt: ACPI memory hotplug support | expand

Commit Message

Shameerali Kolothum Thodi Aug. 13, 2019, 9:05 p.m. UTC 
This initializes the GED device with base memory and irq, configures
ged memory hotplug event and builds the corresponding aml code. With
this, both hot and cold plug of device memory is enabled now for Guest
with ACPI boot.

Memory cold plug support with Guest DT boot is not yet supported.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
v8 --> v9
 -Changes related to GED being a TYPE_SYS_BUS_DEVICE now.
 -Error propagation to _plug() handler.
 -Removed R-by by Eric for now.

v7 --> v8
 -Changed no_acpi_dev to no_ged.
 -Fixed 'dev' reference leak by object_new().
 -Updated bios-tables-test-allowed-diff.h to avoid "make check"
  failure.

---
 hw/arm/Kconfig                        |  2 +
 hw/arm/virt-acpi-build.c              | 16 +++++++
 hw/arm/virt.c                         | 62 ++++++++++++++++++++++++---
 include/hw/arm/virt.h                 |  4 ++
 tests/bios-tables-test-allowed-diff.h |  1 +
 5 files changed, 78 insertions(+), 7 deletions(-)

Comments

Eric Auger Sept. 1, 2019, 11:18 a.m. UTC | #1 
Hi Shameer,

On 8/13/19 11:05 PM, Shameer Kolothum wrote:
> This initializes the GED device with base memory and irq, configures
> ged memory hotplug event and builds the corresponding aml code. With
> this, both hot and cold plug of device memory is enabled now for Guest
> with ACPI boot.
> 
> Memory cold plug support with Guest DT boot is not yet supported.

I think you should comment about bios-tables-test-allowed-diff.h update.
Can't you update the table instead of ignoring the test?

Thanks

Eric
> 
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> ---
> v8 --> v9
>  -Changes related to GED being a TYPE_SYS_BUS_DEVICE now.
>  -Error propagation to _plug() handler.
>  -Removed R-by by Eric for now.
> 
> v7 --> v8
>  -Changed no_acpi_dev to no_ged.
>  -Fixed 'dev' reference leak by object_new().
>  -Updated bios-tables-test-allowed-diff.h to avoid "make check"
>   failure.
> 
> ---
>  hw/arm/Kconfig                        |  2 +
>  hw/arm/virt-acpi-build.c              | 16 +++++++
>  hw/arm/virt.c                         | 62 ++++++++++++++++++++++++---
>  include/hw/arm/virt.h                 |  4 ++
>  tests/bios-tables-test-allowed-diff.h |  1 +
>  5 files changed, 78 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
> index 84961c17ab..ad7f7c089b 100644
> --- a/hw/arm/Kconfig
> +++ b/hw/arm/Kconfig
> @@ -22,6 +22,8 @@ config ARM_VIRT
>      select ACPI_PCI
>      select MEM_DEVICE
>      select DIMM
> +    select ACPI_MEMORY_HOTPLUG
> +    select ACPI_HW_REDUCED
>  
>  config CHEETAH
>      bool
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index 0afb372769..63fa845076 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -40,6 +40,8 @@
>  #include "hw/acpi/aml-build.h"
>  #include "hw/acpi/utils.h"
>  #include "hw/acpi/pci.h"
> +#include "hw/acpi/memory_hotplug.h"
> +#include "hw/acpi/generic_event_device.h"
>  #include "hw/pci/pcie_host.h"
>  #include "hw/pci/pci.h"
>  #include "hw/arm/virt.h"
> @@ -705,6 +707,7 @@ static void
>  build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>  {
>      Aml *scope, *dsdt;
> +    MachineState *ms = MACHINE(vms);
>      const MemMapEntry *memmap = vms->memmap;
>      const int *irqmap = vms->irqmap;
>  
> @@ -729,6 +732,19 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>                        vms->highmem, vms->highmem_ecam);
>      acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
>                         (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
> +    if (vms->acpi_dev) {
> +        build_ged_aml(scope, "\\_SB."GED_DEVICE,
> +                      HOTPLUG_HANDLER(vms->acpi_dev),
> +                      irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE, AML_SYSTEM_MEMORY,
> +                      memmap[VIRT_ACPI_GED].base);
> +    }
> +
> +    if (vms->acpi_dev && ms->ram_slots) {
> +        build_memory_hotplug_aml(scope, ms->ram_slots, "\\_SB", NULL,
> +                                 AML_SYSTEM_MEMORY,
> +                                 memmap[VIRT_PCDIMM_ACPI].base);
> +    }
> +
>      acpi_dsdt_add_power_button(scope);
>  
>      aml_append(dsdt, scope);
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index ef65e721d2..0949a227a9 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -66,6 +66,7 @@
>  #include "target/arm/internals.h"
>  #include "hw/mem/pc-dimm.h"
>  #include "hw/mem/nvdimm.h"
> +#include "hw/acpi/generic_event_device.h"
>  
>  #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
>      static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
> @@ -136,6 +137,8 @@ static const MemMapEntry base_memmap[] = {
>      [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
>      [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
>      [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
> +    [VIRT_PCDIMM_ACPI] =        { 0x09070000, MEMORY_HOTPLUG_IO_LEN },
> +    [VIRT_ACPI_GED] =           { 0x09080000, ACPI_GED_EVT_SEL_LEN },
>      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
>      [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
> @@ -171,6 +174,7 @@ static const int a15irqmap[] = {
>      [VIRT_PCIE] = 3, /* ... to 6 */
>      [VIRT_GPIO] = 7,
>      [VIRT_SECURE_UART] = 8,
> +    [VIRT_ACPI_GED] = 9,
>      [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
>      [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
>      [VIRT_SMMU] = 74,    /* ...to 74 + NUM_SMMU_IRQS - 1 */
> @@ -520,6 +524,26 @@ static void fdt_add_pmu_nodes(const VirtMachineState *vms)
>      }
>  }
>  
> +static inline DeviceState *create_acpi_ged(VirtMachineState *vms, qemu_irq *pic)
> +{
> +    DeviceState *dev;
> +    int irq = vms->irqmap[VIRT_ACPI_GED];
> +    uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT;
> +
> +    dev = qdev_create(NULL, TYPE_ACPI_GED);
> +    qdev_prop_set_uint32(dev, "ged-event", event);
> +    object_property_add_child(qdev_get_machine(), "acpi-ged",
> +                              OBJECT(dev), NULL);
> +    qdev_init_nofail(dev);
> +
> +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, vms->memmap[VIRT_ACPI_GED].base);
> +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1, vms->memmap[VIRT_PCDIMM_ACPI].base);
> +
> +    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, pic[irq]);
> +
> +    return dev;
> +}
> +
>  static void create_its(VirtMachineState *vms, DeviceState *gicdev)
>  {
>      const char *itsclass = its_class_name();
> @@ -1483,6 +1507,7 @@ static void machvirt_init(MachineState *machine)
>      MemoryRegion *ram = g_new(MemoryRegion, 1);
>      bool firmware_loaded;
>      bool aarch64 = true;
> +    bool has_ged = !vmc->no_ged;
>      unsigned int smp_cpus = machine->smp.cpus;
>      unsigned int max_cpus = machine->smp.max_cpus;
>  
> @@ -1697,6 +1722,10 @@ static void machvirt_init(MachineState *machine)
>  
>      create_gpio(vms, pic);
>  
> +    if (has_ged && aarch64 && firmware_loaded && acpi_enabled) {
> +        vms->acpi_dev = create_acpi_ged(vms, pic);
> +    }
> +
>      /* Create mmio transports, so the user can create virtio backends
>       * (which will be automatically plugged in to the transports). If
>       * no backend is created the transport will just sit harmlessly idle.
> @@ -1876,14 +1905,23 @@ static const CPUArchIdList *virt_possible_cpu_arch_ids(MachineState *ms)
>  static void virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
>                                   Error **errp)
>  {
> +    VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> +    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
> +    Error *local_err = NULL;
>  
> -    /*
> -     * The device memory is not yet exposed to the Guest either through
> -     * DT or ACPI and hence both cold/hot plug of memory is explicitly
> -     * disabled for now.
> -     */
> -    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> -        error_setg(errp, "memory cold/hot plug is not yet supported");
> +    if (is_nvdimm) {
> +        error_setg(errp, "nvdimm is not yet supported");
> +        return;
> +    }
> +
> +    if (!vms->acpi_dev) {
> +        error_setg(errp, "memory hotplug is not enabled: missing acpi device");
> +        return;
> +    }
> +
> +    hotplug_handler_pre_plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
> +    if (local_err) {
> +        error_propagate(errp, local_err);
>          return;
>      }
>  
> @@ -1893,11 +1931,18 @@ 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_dev);
> +    hhc->plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
> +out:
>      error_propagate(errp, local_err);
>  }
>  
> @@ -2104,8 +2149,11 @@ DEFINE_VIRT_MACHINE_AS_LATEST(4, 2)
>  
>  static void virt_machine_4_1_options(MachineClass *mc)
>  {
> +    VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
> +
>      virt_machine_4_2_options(mc);
>      compat_props_add(mc->compat_props, hw_compat_4_1, hw_compat_4_1_len);
> +    vmc->no_ged = true;
>  }
>  DEFINE_VIRT_MACHINE(4, 1)
>  
> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
> index a72094204e..577ee49b4b 100644
> --- a/include/hw/arm/virt.h
> +++ b/include/hw/arm/virt.h
> @@ -77,6 +77,8 @@ enum {
>      VIRT_GPIO,
>      VIRT_SECURE_UART,
>      VIRT_SECURE_MEM,
> +    VIRT_PCDIMM_ACPI,
> +    VIRT_ACPI_GED,
>      VIRT_LOWMEMMAP_LAST,
>  };
>  
> @@ -106,6 +108,7 @@ typedef struct {
>      bool claim_edge_triggered_timers;
>      bool smbios_old_sys_ver;
>      bool no_highmem_ecam;
> +    bool no_ged;   /* Machines < 4.2 has no support for ACPI GED device */
>  } VirtMachineClass;
>  
>  typedef struct {
> @@ -133,6 +136,7 @@ typedef struct {
>      uint32_t iommu_phandle;
>      int psci_conduit;
>      hwaddr highest_gpa;
> +    DeviceState *acpi_dev;
>  } VirtMachineState;
>  
>  #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
> diff --git a/tests/bios-tables-test-allowed-diff.h b/tests/bios-tables-test-allowed-diff.h
> index dfb8523c8b..7b4adbc822 100644
> --- a/tests/bios-tables-test-allowed-diff.h
> +++ b/tests/bios-tables-test-allowed-diff.h
> @@ -1 +1,2 @@
>  /* List of comma-separated changed AML files to ignore */
> +"tests/data/acpi/virt/DSDT",
>
Eric Auger Sept. 1, 2019, 11:22 a.m. UTC | #2 
Hi Shameer,
On 9/1/19 1:18 PM, Auger Eric wrote:
> Hi Shameer,
> 
> On 8/13/19 11:05 PM, Shameer Kolothum wrote:
>> This initializes the GED device with base memory and irq, configures
>> ged memory hotplug event and builds the corresponding aml code. With
>> this, both hot and cold plug of device memory is enabled now for Guest
>> with ACPI boot.
>>
>> Memory cold plug support with Guest DT boot is not yet supported.
> 
> I think you should comment about bios-tables-test-allowed-diff.h update.
> Can't you update the table instead of ignoring the test?
> 
> Thanks
> 
> Eric
>>
>> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
>> ---
>> v8 --> v9
>>  -Changes related to GED being a TYPE_SYS_BUS_DEVICE now.
>>  -Error propagation to _plug() handler.
>>  -Removed R-by by Eric for now.
>>
>> v7 --> v8
>>  -Changed no_acpi_dev to no_ged.
>>  -Fixed 'dev' reference leak by object_new().
>>  -Updated bios-tables-test-allowed-diff.h to avoid "make check"
>>   failure.
>>
>> ---
>>  hw/arm/Kconfig                        |  2 +
>>  hw/arm/virt-acpi-build.c              | 16 +++++++
>>  hw/arm/virt.c                         | 62 ++++++++++++++++++++++++---
>>  include/hw/arm/virt.h                 |  4 ++
>>  tests/bios-tables-test-allowed-diff.h |  1 +
>>  5 files changed, 78 insertions(+), 7 deletions(-)
>>
>> diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
>> index 84961c17ab..ad7f7c089b 100644
>> --- a/hw/arm/Kconfig
>> +++ b/hw/arm/Kconfig
>> @@ -22,6 +22,8 @@ config ARM_VIRT
>>      select ACPI_PCI
>>      select MEM_DEVICE
>>      select DIMM
>> +    select ACPI_MEMORY_HOTPLUG
>> +    select ACPI_HW_REDUCED
>>  
>>  config CHEETAH
>>      bool
>> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
>> index 0afb372769..63fa845076 100644
>> --- a/hw/arm/virt-acpi-build.c
>> +++ b/hw/arm/virt-acpi-build.c
>> @@ -40,6 +40,8 @@
>>  #include "hw/acpi/aml-build.h"
>>  #include "hw/acpi/utils.h"
>>  #include "hw/acpi/pci.h"
>> +#include "hw/acpi/memory_hotplug.h"
>> +#include "hw/acpi/generic_event_device.h"
>>  #include "hw/pci/pcie_host.h"
>>  #include "hw/pci/pci.h"
>>  #include "hw/arm/virt.h"
>> @@ -705,6 +707,7 @@ static void
>>  build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>>  {
>>      Aml *scope, *dsdt;
>> +    MachineState *ms = MACHINE(vms);
>>      const MemMapEntry *memmap = vms->memmap;
>>      const int *irqmap = vms->irqmap;
>>  
>> @@ -729,6 +732,19 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>>                        vms->highmem, vms->highmem_ecam);
>>      acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
>>                         (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
>> +    if (vms->acpi_dev) {
>> +        build_ged_aml(scope, "\\_SB."GED_DEVICE,
>> +                      HOTPLUG_HANDLER(vms->acpi_dev),
>> +                      irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE, AML_SYSTEM_MEMORY,
>> +                      memmap[VIRT_ACPI_GED].base);
>> +    }
>> +
>> +    if (vms->acpi_dev && ms->ram_slots) {
>> +        build_memory_hotplug_aml(scope, ms->ram_slots, "\\_SB", NULL,
>> +                                 AML_SYSTEM_MEMORY,
>> +                                 memmap[VIRT_PCDIMM_ACPI].base);
>> +    }
>> +
>>      acpi_dsdt_add_power_button(scope);
>>  
>>      aml_append(dsdt, scope);
>> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
>> index ef65e721d2..0949a227a9 100644
>> --- a/hw/arm/virt.c
>> +++ b/hw/arm/virt.c
>> @@ -66,6 +66,7 @@
>>  #include "target/arm/internals.h"
>>  #include "hw/mem/pc-dimm.h"
>>  #include "hw/mem/nvdimm.h"
>> +#include "hw/acpi/generic_event_device.h"
>>  
>>  #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
>>      static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
>> @@ -136,6 +137,8 @@ static const MemMapEntry base_memmap[] = {
>>      [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
>>      [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
>>      [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
>> +    [VIRT_PCDIMM_ACPI] =        { 0x09070000, MEMORY_HOTPLUG_IO_LEN },
>> +    [VIRT_ACPI_GED] =           { 0x09080000, ACPI_GED_EVT_SEL_LEN },
>>      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
>>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
>>      [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
>> @@ -171,6 +174,7 @@ static const int a15irqmap[] = {
>>      [VIRT_PCIE] = 3, /* ... to 6 */
>>      [VIRT_GPIO] = 7,
>>      [VIRT_SECURE_UART] = 8,
>> +    [VIRT_ACPI_GED] = 9,
>>      [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
>>      [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
>>      [VIRT_SMMU] = 74,    /* ...to 74 + NUM_SMMU_IRQS - 1 */
>> @@ -520,6 +524,26 @@ static void fdt_add_pmu_nodes(const VirtMachineState *vms)
>>      }
>>  }
>>  
>> +static inline DeviceState *create_acpi_ged(VirtMachineState *vms, qemu_irq *pic)
>> +{
>> +    DeviceState *dev;
>> +    int irq = vms->irqmap[VIRT_ACPI_GED];
>> +    uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT;
>> +
>> +    dev = qdev_create(NULL, TYPE_ACPI_GED);
>> +    qdev_prop_set_uint32(dev, "ged-event", event);
>> +    object_property_add_child(qdev_get_machine(), "acpi-ged",
>> +                              OBJECT(dev), NULL);
Out of curiosity, what is the object_property_add_child() used for?

Thanks

Eric
>> +    qdev_init_nofail(dev);
>> +
>> +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, vms->memmap[VIRT_ACPI_GED].base);
>> +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1, vms->memmap[VIRT_PCDIMM_ACPI].base);
>> +
>> +    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, pic[irq]);
>> +
>> +    return dev;
>> +}
>> +
>>  static void create_its(VirtMachineState *vms, DeviceState *gicdev)
>>  {
>>      const char *itsclass = its_class_name();
>> @@ -1483,6 +1507,7 @@ static void machvirt_init(MachineState *machine)
>>      MemoryRegion *ram = g_new(MemoryRegion, 1);
>>      bool firmware_loaded;
>>      bool aarch64 = true;
>> +    bool has_ged = !vmc->no_ged;
>>      unsigned int smp_cpus = machine->smp.cpus;
>>      unsigned int max_cpus = machine->smp.max_cpus;
>>  
>> @@ -1697,6 +1722,10 @@ static void machvirt_init(MachineState *machine)
>>  
>>      create_gpio(vms, pic);
>>  
>> +    if (has_ged && aarch64 && firmware_loaded && acpi_enabled) {
>> +        vms->acpi_dev = create_acpi_ged(vms, pic);
>> +    }
>> +
>>      /* Create mmio transports, so the user can create virtio backends
>>       * (which will be automatically plugged in to the transports). If
>>       * no backend is created the transport will just sit harmlessly idle.
>> @@ -1876,14 +1905,23 @@ static const CPUArchIdList *virt_possible_cpu_arch_ids(MachineState *ms)
>>  static void virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
>>                                   Error **errp)
>>  {
>> +    VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
>> +    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
>> +    Error *local_err = NULL;
>>  
>> -    /*
>> -     * The device memory is not yet exposed to the Guest either through
>> -     * DT or ACPI and hence both cold/hot plug of memory is explicitly
>> -     * disabled for now.
>> -     */
>> -    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
>> -        error_setg(errp, "memory cold/hot plug is not yet supported");
>> +    if (is_nvdimm) {
>> +        error_setg(errp, "nvdimm is not yet supported");
>> +        return;
>> +    }
>> +
>> +    if (!vms->acpi_dev) {
>> +        error_setg(errp, "memory hotplug is not enabled: missing acpi device");
>> +        return;
>> +    }
>> +
>> +    hotplug_handler_pre_plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
>> +    if (local_err) {
>> +        error_propagate(errp, local_err);
>>          return;
>>      }
>>  
>> @@ -1893,11 +1931,18 @@ 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_dev);
>> +    hhc->plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
>> +out:
>>      error_propagate(errp, local_err);
>>  }
>>  
>> @@ -2104,8 +2149,11 @@ DEFINE_VIRT_MACHINE_AS_LATEST(4, 2)
>>  
>>  static void virt_machine_4_1_options(MachineClass *mc)
>>  {
>> +    VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
>> +
>>      virt_machine_4_2_options(mc);
>>      compat_props_add(mc->compat_props, hw_compat_4_1, hw_compat_4_1_len);
>> +    vmc->no_ged = true;
>>  }
>>  DEFINE_VIRT_MACHINE(4, 1)
>>  
>> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
>> index a72094204e..577ee49b4b 100644
>> --- a/include/hw/arm/virt.h
>> +++ b/include/hw/arm/virt.h
>> @@ -77,6 +77,8 @@ enum {
>>      VIRT_GPIO,
>>      VIRT_SECURE_UART,
>>      VIRT_SECURE_MEM,
>> +    VIRT_PCDIMM_ACPI,
>> +    VIRT_ACPI_GED,
>>      VIRT_LOWMEMMAP_LAST,
>>  };
>>  
>> @@ -106,6 +108,7 @@ typedef struct {
>>      bool claim_edge_triggered_timers;
>>      bool smbios_old_sys_ver;
>>      bool no_highmem_ecam;
>> +    bool no_ged;   /* Machines < 4.2 has no support for ACPI GED device */
>>  } VirtMachineClass;
>>  
>>  typedef struct {
>> @@ -133,6 +136,7 @@ typedef struct {
>>      uint32_t iommu_phandle;
>>      int psci_conduit;
>>      hwaddr highest_gpa;
>> +    DeviceState *acpi_dev;
>>  } VirtMachineState;
>>  
>>  #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
>> diff --git a/tests/bios-tables-test-allowed-diff.h b/tests/bios-tables-test-allowed-diff.h
>> index dfb8523c8b..7b4adbc822 100644
>> --- a/tests/bios-tables-test-allowed-diff.h
>> +++ b/tests/bios-tables-test-allowed-diff.h
>> @@ -1 +1,2 @@
>>  /* List of comma-separated changed AML files to ignore */
>> +"tests/data/acpi/virt/DSDT",
>>
>
Shameerali Kolothum Thodi Sept. 2, 2019, 9:21 a.m. UTC | #3 
Hi Eric,

> -----Original Message-----
> From: Auger Eric [mailto:eric.auger@redhat.com]
> Sent: 01 September 2019 12:19
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>;
> qemu-devel@nongnu.org; qemu-arm@nongnu.org; imammedo@redhat.com
> Cc: peter.maydell@linaro.org; shannon.zhaosl@gmail.com;
> sameo@linux.intel.com; sebastien.boeuf@intel.com; xuwei (O)
> <xuwei5@huawei.com>; lersek@redhat.com; ard.biesheuvel@linaro.org;
> Linuxarm <linuxarm@huawei.com>
> Subject: Re: [PATCH-for-4.2 v9 06/12] hw/arm/virt: Enable device memory
> cold/hot plug with ACPI boot
> 
> Hi Shameer,
> 
> On 8/13/19 11:05 PM, Shameer Kolothum wrote:
> > This initializes the GED device with base memory and irq, configures
> > ged memory hotplug event and builds the corresponding aml code. With
> > this, both hot and cold plug of device memory is enabled now for Guest
> > with ACPI boot.
> >
> > Memory cold plug support with Guest DT boot is not yet supported.
> 
> I think you should comment about bios-tables-test-allowed-diff.h update.

Ok. I will add that.

> Can't you update the table instead of ignoring the test?

I think that is not how it is handled now. The process is,

"Expected table change is then handled like this:
1. add table to diff allowed list
2. change generating code (can be combined with 1)
3. maintainer runs a script to update expected +
   blows away allowed diff list "
https://patchwork.kernel.org/patch/10967339/

Thanks,
Shameer

> 
> Thanks
> 
> Eric
> >
> > Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> > ---
> > v8 --> v9
> >  -Changes related to GED being a TYPE_SYS_BUS_DEVICE now.
> >  -Error propagation to _plug() handler.
> >  -Removed R-by by Eric for now.
> >
> > v7 --> v8
> >  -Changed no_acpi_dev to no_ged.
> >  -Fixed 'dev' reference leak by object_new().
> >  -Updated bios-tables-test-allowed-diff.h to avoid "make check"
> >   failure.
> >
> > ---
> >  hw/arm/Kconfig                        |  2 +
> >  hw/arm/virt-acpi-build.c              | 16 +++++++
> >  hw/arm/virt.c                         | 62
> ++++++++++++++++++++++++---
> >  include/hw/arm/virt.h                 |  4 ++
> >  tests/bios-tables-test-allowed-diff.h |  1 +
> >  5 files changed, 78 insertions(+), 7 deletions(-)
> >
> > diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig index
> > 84961c17ab..ad7f7c089b 100644
> > --- a/hw/arm/Kconfig
> > +++ b/hw/arm/Kconfig
> > @@ -22,6 +22,8 @@ config ARM_VIRT
> >      select ACPI_PCI
> >      select MEM_DEVICE
> >      select DIMM
> > +    select ACPI_MEMORY_HOTPLUG
> > +    select ACPI_HW_REDUCED
> >
> >  config CHEETAH
> >      bool
> > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index
> > 0afb372769..63fa845076 100644
> > --- a/hw/arm/virt-acpi-build.c
> > +++ b/hw/arm/virt-acpi-build.c
> > @@ -40,6 +40,8 @@
> >  #include "hw/acpi/aml-build.h"
> >  #include "hw/acpi/utils.h"
> >  #include "hw/acpi/pci.h"
> > +#include "hw/acpi/memory_hotplug.h"
> > +#include "hw/acpi/generic_event_device.h"
> >  #include "hw/pci/pcie_host.h"
> >  #include "hw/pci/pci.h"
> >  #include "hw/arm/virt.h"
> > @@ -705,6 +707,7 @@ static void
> >  build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState
> > *vms)  {
> >      Aml *scope, *dsdt;
> > +    MachineState *ms = MACHINE(vms);
> >      const MemMapEntry *memmap = vms->memmap;
> >      const int *irqmap = vms->irqmap;
> >
> > @@ -729,6 +732,19 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> VirtMachineState *vms)
> >                        vms->highmem, vms->highmem_ecam);
> >      acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
> >                         (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
> > +    if (vms->acpi_dev) {
> > +        build_ged_aml(scope, "\\_SB."GED_DEVICE,
> > +                      HOTPLUG_HANDLER(vms->acpi_dev),
> > +                      irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE,
> AML_SYSTEM_MEMORY,
> > +                      memmap[VIRT_ACPI_GED].base);
> > +    }
> > +
> > +    if (vms->acpi_dev && ms->ram_slots) {
> > +        build_memory_hotplug_aml(scope, ms->ram_slots, "\\_SB",
> NULL,
> > +                                 AML_SYSTEM_MEMORY,
> > +
> memmap[VIRT_PCDIMM_ACPI].base);
> > +    }
> > +
> >      acpi_dsdt_add_power_button(scope);
> >
> >      aml_append(dsdt, scope);
> > diff --git a/hw/arm/virt.c b/hw/arm/virt.c index
> > ef65e721d2..0949a227a9 100644
> > --- a/hw/arm/virt.c
> > +++ b/hw/arm/virt.c
> > @@ -66,6 +66,7 @@
> >  #include "target/arm/internals.h"
> >  #include "hw/mem/pc-dimm.h"
> >  #include "hw/mem/nvdimm.h"
> > +#include "hw/acpi/generic_event_device.h"
> >
> >  #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
> >      static void virt_##major##_##minor##_class_init(ObjectClass *oc,
> > \ @@ -136,6 +137,8 @@ static const MemMapEntry base_memmap[] = {
> >      [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
> >      [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
> >      [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
> > +    [VIRT_PCDIMM_ACPI] =        { 0x09070000,
> MEMORY_HOTPLUG_IO_LEN },
> > +    [VIRT_ACPI_GED] =           { 0x09080000,
> ACPI_GED_EVT_SEL_LEN },
> >      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
> >      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that
> size */
> >      [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
> > @@ -171,6 +174,7 @@ static const int a15irqmap[] = {
> >      [VIRT_PCIE] = 3, /* ... to 6 */
> >      [VIRT_GPIO] = 7,
> >      [VIRT_SECURE_UART] = 8,
> > +    [VIRT_ACPI_GED] = 9,
> >      [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
> >      [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
> >      [VIRT_SMMU] = 74,    /* ...to 74 + NUM_SMMU_IRQS - 1 */
> > @@ -520,6 +524,26 @@ static void fdt_add_pmu_nodes(const
> VirtMachineState *vms)
> >      }
> >  }
> >
> > +static inline DeviceState *create_acpi_ged(VirtMachineState *vms,
> > +qemu_irq *pic) {
> > +    DeviceState *dev;
> > +    int irq = vms->irqmap[VIRT_ACPI_GED];
> > +    uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT;
> > +
> > +    dev = qdev_create(NULL, TYPE_ACPI_GED);
> > +    qdev_prop_set_uint32(dev, "ged-event", event);
> > +    object_property_add_child(qdev_get_machine(), "acpi-ged",
> > +                              OBJECT(dev), NULL);
> > +    qdev_init_nofail(dev);
> > +
> > +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0,
> vms->memmap[VIRT_ACPI_GED].base);
> > +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1,
> > + vms->memmap[VIRT_PCDIMM_ACPI].base);
> > +
> > +    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, pic[irq]);
> > +
> > +    return dev;
> > +}
> > +
> >  static void create_its(VirtMachineState *vms, DeviceState *gicdev)  {
> >      const char *itsclass = its_class_name(); @@ -1483,6 +1507,7 @@
> > static void machvirt_init(MachineState *machine)
> >      MemoryRegion *ram = g_new(MemoryRegion, 1);
> >      bool firmware_loaded;
> >      bool aarch64 = true;
> > +    bool has_ged = !vmc->no_ged;
> >      unsigned int smp_cpus = machine->smp.cpus;
> >      unsigned int max_cpus = machine->smp.max_cpus;
> >
> > @@ -1697,6 +1722,10 @@ static void machvirt_init(MachineState
> > *machine)
> >
> >      create_gpio(vms, pic);
> >
> > +    if (has_ged && aarch64 && firmware_loaded && acpi_enabled) {
> > +        vms->acpi_dev = create_acpi_ged(vms, pic);
> > +    }
> > +
> >      /* Create mmio transports, so the user can create virtio backends
> >       * (which will be automatically plugged in to the transports). If
> >       * no backend is created the transport will just sit harmlessly idle.
> > @@ -1876,14 +1905,23 @@ static const CPUArchIdList
> > *virt_possible_cpu_arch_ids(MachineState *ms)  static void
> virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> >                                   Error **errp)  {
> > +    VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> > +    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev),
> TYPE_NVDIMM);
> > +    Error *local_err = NULL;
> >
> > -    /*
> > -     * The device memory is not yet exposed to the Guest either through
> > -     * DT or ACPI and hence both cold/hot plug of memory is explicitly
> > -     * disabled for now.
> > -     */
> > -    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> > -        error_setg(errp, "memory cold/hot plug is not yet supported");
> > +    if (is_nvdimm) {
> > +        error_setg(errp, "nvdimm is not yet supported");
> > +        return;
> > +    }
> > +
> > +    if (!vms->acpi_dev) {
> > +        error_setg(errp, "memory hotplug is not enabled: missing acpi
> device");
> > +        return;
> > +    }
> > +
> > +    hotplug_handler_pre_plug(HOTPLUG_HANDLER(vms->acpi_dev), dev,
> &local_err);
> > +    if (local_err) {
> > +        error_propagate(errp, local_err);
> >          return;
> >      }
> >
> > @@ -1893,11 +1931,18 @@ 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_dev);
> > +    hhc->plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
> > +out:
> >      error_propagate(errp, local_err);  }
> >
> > @@ -2104,8 +2149,11 @@ DEFINE_VIRT_MACHINE_AS_LATEST(4, 2)
> >
> >  static void virt_machine_4_1_options(MachineClass *mc)  {
> > +    VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
> > +
> >      virt_machine_4_2_options(mc);
> >      compat_props_add(mc->compat_props, hw_compat_4_1,
> > hw_compat_4_1_len);
> > +    vmc->no_ged = true;
> >  }
> >  DEFINE_VIRT_MACHINE(4, 1)
> >
> > diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h index
> > a72094204e..577ee49b4b 100644
> > --- a/include/hw/arm/virt.h
> > +++ b/include/hw/arm/virt.h
> > @@ -77,6 +77,8 @@ enum {
> >      VIRT_GPIO,
> >      VIRT_SECURE_UART,
> >      VIRT_SECURE_MEM,
> > +    VIRT_PCDIMM_ACPI,
> > +    VIRT_ACPI_GED,
> >      VIRT_LOWMEMMAP_LAST,
> >  };
> >
> > @@ -106,6 +108,7 @@ typedef struct {
> >      bool claim_edge_triggered_timers;
> >      bool smbios_old_sys_ver;
> >      bool no_highmem_ecam;
> > +    bool no_ged;   /* Machines < 4.2 has no support for ACPI GED device
> */
> >  } VirtMachineClass;
> >
> >  typedef struct {
> > @@ -133,6 +136,7 @@ typedef struct {
> >      uint32_t iommu_phandle;
> >      int psci_conduit;
> >      hwaddr highest_gpa;
> > +    DeviceState *acpi_dev;
> >  } VirtMachineState;
> >
> >  #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM :
> > VIRT_PCIE_ECAM) diff --git a/tests/bios-tables-test-allowed-diff.h
> > b/tests/bios-tables-test-allowed-diff.h
> > index dfb8523c8b..7b4adbc822 100644
> > --- a/tests/bios-tables-test-allowed-diff.h
> > +++ b/tests/bios-tables-test-allowed-diff.h
> > @@ -1 +1,2 @@
> >  /* List of comma-separated changed AML files to ignore */
> > +"tests/data/acpi/virt/DSDT",
> >
Eric Auger Sept. 2, 2019, 9:32 a.m. UTC | #4 
Hi Shameer,

On 9/2/19 11:21 AM, Shameerali Kolothum Thodi wrote:
> Hi Eric,
> 
>> -----Original Message-----
>> From: Auger Eric [mailto:eric.auger@redhat.com]
>> Sent: 01 September 2019 12:19
>> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>;
>> qemu-devel@nongnu.org; qemu-arm@nongnu.org; imammedo@redhat.com
>> Cc: peter.maydell@linaro.org; shannon.zhaosl@gmail.com;
>> sameo@linux.intel.com; sebastien.boeuf@intel.com; xuwei (O)
>> <xuwei5@huawei.com>; lersek@redhat.com; ard.biesheuvel@linaro.org;
>> Linuxarm <linuxarm@huawei.com>
>> Subject: Re: [PATCH-for-4.2 v9 06/12] hw/arm/virt: Enable device memory
>> cold/hot plug with ACPI boot
>>
>> Hi Shameer,
>>
>> On 8/13/19 11:05 PM, Shameer Kolothum wrote:
>>> This initializes the GED device with base memory and irq, configures
>>> ged memory hotplug event and builds the corresponding aml code. With
>>> this, both hot and cold plug of device memory is enabled now for Guest
>>> with ACPI boot.
>>>
>>> Memory cold plug support with Guest DT boot is not yet supported.
>>
>> I think you should comment about bios-tables-test-allowed-diff.h update.
> 
> Ok. I will add that.
> 
>> Can't you update the table instead of ignoring the test?
> 
> I think that is not how it is handled now. The process is,
> 
> "Expected table change is then handled like this:
> 1. add table to diff allowed list
> 2. change generating code (can be combined with 1)
> 3. maintainer runs a script to update expected +
>    blows away allowed diff list "
> https://patchwork.kernel.org/patch/10967339/

Ok. Thanks for the link.

Best Regards

Eric
> 
> Thanks,
> Shameer
> 
>>
>> Thanks
>>
>> Eric
>>>
>>> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
>>> ---
>>> v8 --> v9
>>>  -Changes related to GED being a TYPE_SYS_BUS_DEVICE now.
>>>  -Error propagation to _plug() handler.
>>>  -Removed R-by by Eric for now.
>>>
>>> v7 --> v8
>>>  -Changed no_acpi_dev to no_ged.
>>>  -Fixed 'dev' reference leak by object_new().
>>>  -Updated bios-tables-test-allowed-diff.h to avoid "make check"
>>>   failure.
>>>
>>> ---
>>>  hw/arm/Kconfig                        |  2 +
>>>  hw/arm/virt-acpi-build.c              | 16 +++++++
>>>  hw/arm/virt.c                         | 62
>> ++++++++++++++++++++++++---
>>>  include/hw/arm/virt.h                 |  4 ++
>>>  tests/bios-tables-test-allowed-diff.h |  1 +
>>>  5 files changed, 78 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig index
>>> 84961c17ab..ad7f7c089b 100644
>>> --- a/hw/arm/Kconfig
>>> +++ b/hw/arm/Kconfig
>>> @@ -22,6 +22,8 @@ config ARM_VIRT
>>>      select ACPI_PCI
>>>      select MEM_DEVICE
>>>      select DIMM
>>> +    select ACPI_MEMORY_HOTPLUG
>>> +    select ACPI_HW_REDUCED
>>>
>>>  config CHEETAH
>>>      bool
>>> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index
>>> 0afb372769..63fa845076 100644
>>> --- a/hw/arm/virt-acpi-build.c
>>> +++ b/hw/arm/virt-acpi-build.c
>>> @@ -40,6 +40,8 @@
>>>  #include "hw/acpi/aml-build.h"
>>>  #include "hw/acpi/utils.h"
>>>  #include "hw/acpi/pci.h"
>>> +#include "hw/acpi/memory_hotplug.h"
>>> +#include "hw/acpi/generic_event_device.h"
>>>  #include "hw/pci/pcie_host.h"
>>>  #include "hw/pci/pci.h"
>>>  #include "hw/arm/virt.h"
>>> @@ -705,6 +707,7 @@ static void
>>>  build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState
>>> *vms)  {
>>>      Aml *scope, *dsdt;
>>> +    MachineState *ms = MACHINE(vms);
>>>      const MemMapEntry *memmap = vms->memmap;
>>>      const int *irqmap = vms->irqmap;
>>>
>>> @@ -729,6 +732,19 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>> VirtMachineState *vms)
>>>                        vms->highmem, vms->highmem_ecam);
>>>      acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
>>>                         (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
>>> +    if (vms->acpi_dev) {
>>> +        build_ged_aml(scope, "\\_SB."GED_DEVICE,
>>> +                      HOTPLUG_HANDLER(vms->acpi_dev),
>>> +                      irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE,
>> AML_SYSTEM_MEMORY,
>>> +                      memmap[VIRT_ACPI_GED].base);
>>> +    }
>>> +
>>> +    if (vms->acpi_dev && ms->ram_slots) {
>>> +        build_memory_hotplug_aml(scope, ms->ram_slots, "\\_SB",
>> NULL,
>>> +                                 AML_SYSTEM_MEMORY,
>>> +
>> memmap[VIRT_PCDIMM_ACPI].base);
>>> +    }
>>> +
>>>      acpi_dsdt_add_power_button(scope);
>>>
>>>      aml_append(dsdt, scope);
>>> diff --git a/hw/arm/virt.c b/hw/arm/virt.c index
>>> ef65e721d2..0949a227a9 100644
>>> --- a/hw/arm/virt.c
>>> +++ b/hw/arm/virt.c
>>> @@ -66,6 +66,7 @@
>>>  #include "target/arm/internals.h"
>>>  #include "hw/mem/pc-dimm.h"
>>>  #include "hw/mem/nvdimm.h"
>>> +#include "hw/acpi/generic_event_device.h"
>>>
>>>  #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
>>>      static void virt_##major##_##minor##_class_init(ObjectClass *oc,
>>> \ @@ -136,6 +137,8 @@ static const MemMapEntry base_memmap[] = {
>>>      [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
>>>      [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
>>>      [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
>>> +    [VIRT_PCDIMM_ACPI] =        { 0x09070000,
>> MEMORY_HOTPLUG_IO_LEN },
>>> +    [VIRT_ACPI_GED] =           { 0x09080000,
>> ACPI_GED_EVT_SEL_LEN },
>>>      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
>>>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that
>> size */
>>>      [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
>>> @@ -171,6 +174,7 @@ static const int a15irqmap[] = {
>>>      [VIRT_PCIE] = 3, /* ... to 6 */
>>>      [VIRT_GPIO] = 7,
>>>      [VIRT_SECURE_UART] = 8,
>>> +    [VIRT_ACPI_GED] = 9,
>>>      [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
>>>      [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
>>>      [VIRT_SMMU] = 74,    /* ...to 74 + NUM_SMMU_IRQS - 1 */
>>> @@ -520,6 +524,26 @@ static void fdt_add_pmu_nodes(const
>> VirtMachineState *vms)
>>>      }
>>>  }
>>>
>>> +static inline DeviceState *create_acpi_ged(VirtMachineState *vms,
>>> +qemu_irq *pic) {
>>> +    DeviceState *dev;
>>> +    int irq = vms->irqmap[VIRT_ACPI_GED];
>>> +    uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT;
>>> +
>>> +    dev = qdev_create(NULL, TYPE_ACPI_GED);
>>> +    qdev_prop_set_uint32(dev, "ged-event", event);
>>> +    object_property_add_child(qdev_get_machine(), "acpi-ged",
>>> +                              OBJECT(dev), NULL);
>>> +    qdev_init_nofail(dev);
>>> +
>>> +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0,
>> vms->memmap[VIRT_ACPI_GED].base);
>>> +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1,
>>> + vms->memmap[VIRT_PCDIMM_ACPI].base);
>>> +
>>> +    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, pic[irq]);
>>> +
>>> +    return dev;
>>> +}
>>> +
>>>  static void create_its(VirtMachineState *vms, DeviceState *gicdev)  {
>>>      const char *itsclass = its_class_name(); @@ -1483,6 +1507,7 @@
>>> static void machvirt_init(MachineState *machine)
>>>      MemoryRegion *ram = g_new(MemoryRegion, 1);
>>>      bool firmware_loaded;
>>>      bool aarch64 = true;
>>> +    bool has_ged = !vmc->no_ged;
>>>      unsigned int smp_cpus = machine->smp.cpus;
>>>      unsigned int max_cpus = machine->smp.max_cpus;
>>>
>>> @@ -1697,6 +1722,10 @@ static void machvirt_init(MachineState
>>> *machine)
>>>
>>>      create_gpio(vms, pic);
>>>
>>> +    if (has_ged && aarch64 && firmware_loaded && acpi_enabled) {
>>> +        vms->acpi_dev = create_acpi_ged(vms, pic);
>>> +    }
>>> +
>>>      /* Create mmio transports, so the user can create virtio backends
>>>       * (which will be automatically plugged in to the transports). If
>>>       * no backend is created the transport will just sit harmlessly idle.
>>> @@ -1876,14 +1905,23 @@ static const CPUArchIdList
>>> *virt_possible_cpu_arch_ids(MachineState *ms)  static void
>> virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
>>>                                   Error **errp)  {
>>> +    VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
>>> +    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev),
>> TYPE_NVDIMM);
>>> +    Error *local_err = NULL;
>>>
>>> -    /*
>>> -     * The device memory is not yet exposed to the Guest either through
>>> -     * DT or ACPI and hence both cold/hot plug of memory is explicitly
>>> -     * disabled for now.
>>> -     */
>>> -    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
>>> -        error_setg(errp, "memory cold/hot plug is not yet supported");
>>> +    if (is_nvdimm) {
>>> +        error_setg(errp, "nvdimm is not yet supported");
>>> +        return;
>>> +    }
>>> +
>>> +    if (!vms->acpi_dev) {
>>> +        error_setg(errp, "memory hotplug is not enabled: missing acpi
>> device");
>>> +        return;
>>> +    }
>>> +
>>> +    hotplug_handler_pre_plug(HOTPLUG_HANDLER(vms->acpi_dev), dev,
>> &local_err);
>>> +    if (local_err) {
>>> +        error_propagate(errp, local_err);
>>>          return;
>>>      }
>>>
>>> @@ -1893,11 +1931,18 @@ 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_dev);
>>> +    hhc->plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
>>> +out:
>>>      error_propagate(errp, local_err);  }
>>>
>>> @@ -2104,8 +2149,11 @@ DEFINE_VIRT_MACHINE_AS_LATEST(4, 2)
>>>
>>>  static void virt_machine_4_1_options(MachineClass *mc)  {
>>> +    VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
>>> +
>>>      virt_machine_4_2_options(mc);
>>>      compat_props_add(mc->compat_props, hw_compat_4_1,
>>> hw_compat_4_1_len);
>>> +    vmc->no_ged = true;
>>>  }
>>>  DEFINE_VIRT_MACHINE(4, 1)
>>>
>>> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h index
>>> a72094204e..577ee49b4b 100644
>>> --- a/include/hw/arm/virt.h
>>> +++ b/include/hw/arm/virt.h
>>> @@ -77,6 +77,8 @@ enum {
>>>      VIRT_GPIO,
>>>      VIRT_SECURE_UART,
>>>      VIRT_SECURE_MEM,
>>> +    VIRT_PCDIMM_ACPI,
>>> +    VIRT_ACPI_GED,
>>>      VIRT_LOWMEMMAP_LAST,
>>>  };
>>>
>>> @@ -106,6 +108,7 @@ typedef struct {
>>>      bool claim_edge_triggered_timers;
>>>      bool smbios_old_sys_ver;
>>>      bool no_highmem_ecam;
>>> +    bool no_ged;   /* Machines < 4.2 has no support for ACPI GED device
>> */
>>>  } VirtMachineClass;
>>>
>>>  typedef struct {
>>> @@ -133,6 +136,7 @@ typedef struct {
>>>      uint32_t iommu_phandle;
>>>      int psci_conduit;
>>>      hwaddr highest_gpa;
>>> +    DeviceState *acpi_dev;
>>>  } VirtMachineState;
>>>
>>>  #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM :
>>> VIRT_PCIE_ECAM) diff --git a/tests/bios-tables-test-allowed-diff.h
>>> b/tests/bios-tables-test-allowed-diff.h
>>> index dfb8523c8b..7b4adbc822 100644
>>> --- a/tests/bios-tables-test-allowed-diff.h
>>> +++ b/tests/bios-tables-test-allowed-diff.h
>>> @@ -1 +1,2 @@
>>>  /* List of comma-separated changed AML files to ignore */
>>> +"tests/data/acpi/virt/DSDT",
>>>
Shameerali Kolothum Thodi Sept. 2, 2019, 9:34 a.m. UTC | #5 
Hi Eric,

> -----Original Message-----
> From: Auger Eric [mailto:eric.auger@redhat.com]
> Sent: 01 September 2019 12:23
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>;
> qemu-devel@nongnu.org; qemu-arm@nongnu.org; imammedo@redhat.com
> Cc: peter.maydell@linaro.org; sameo@linux.intel.com;
> ard.biesheuvel@linaro.org; Linuxarm <linuxarm@huawei.com>; xuwei (O)
> <xuwei5@huawei.com>; shannon.zhaosl@gmail.com;
> sebastien.boeuf@intel.com; lersek@redhat.com
> Subject: Re: [Qemu-devel] [PATCH-for-4.2 v9 06/12] hw/arm/virt: Enable device
> memory cold/hot plug with ACPI boot
> 
> Hi Shameer,
> On 9/1/19 1:18 PM, Auger Eric wrote:
> > Hi Shameer,
> >
> > On 8/13/19 11:05 PM, Shameer Kolothum wrote:
> >> This initializes the GED device with base memory and irq, configures
> >> ged memory hotplug event and builds the corresponding aml code. With
> >> this, both hot and cold plug of device memory is enabled now for
> >> Guest with ACPI boot.
> >>
> >> Memory cold plug support with Guest DT boot is not yet supported.
> >
> > I think you should comment about bios-tables-test-allowed-diff.h update.
> > Can't you update the table instead of ignoring the test?
> >
> > Thanks
> >
> > Eric
> >>
> >> Signed-off-by: Shameer Kolothum
> >> <shameerali.kolothum.thodi@huawei.com>
> >> ---
> >> v8 --> v9
> >>  -Changes related to GED being a TYPE_SYS_BUS_DEVICE now.
> >>  -Error propagation to _plug() handler.
> >>  -Removed R-by by Eric for now.
> >>
> >> v7 --> v8
> >>  -Changed no_acpi_dev to no_ged.
> >>  -Fixed 'dev' reference leak by object_new().
> >>  -Updated bios-tables-test-allowed-diff.h to avoid "make check"
> >>   failure.
> >>
> >> ---
> >>  hw/arm/Kconfig                        |  2 +
> >>  hw/arm/virt-acpi-build.c              | 16 +++++++
> >>  hw/arm/virt.c                         | 62
> ++++++++++++++++++++++++---
> >>  include/hw/arm/virt.h                 |  4 ++
> >>  tests/bios-tables-test-allowed-diff.h |  1 +
> >>  5 files changed, 78 insertions(+), 7 deletions(-)
> >>
> >> diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig index
> >> 84961c17ab..ad7f7c089b 100644
> >> --- a/hw/arm/Kconfig
> >> +++ b/hw/arm/Kconfig
> >> @@ -22,6 +22,8 @@ config ARM_VIRT
> >>      select ACPI_PCI
> >>      select MEM_DEVICE
> >>      select DIMM
> >> +    select ACPI_MEMORY_HOTPLUG
> >> +    select ACPI_HW_REDUCED
> >>
> >>  config CHEETAH
> >>      bool
> >> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> >> index 0afb372769..63fa845076 100644
> >> --- a/hw/arm/virt-acpi-build.c
> >> +++ b/hw/arm/virt-acpi-build.c
> >> @@ -40,6 +40,8 @@
> >>  #include "hw/acpi/aml-build.h"
> >>  #include "hw/acpi/utils.h"
> >>  #include "hw/acpi/pci.h"
> >> +#include "hw/acpi/memory_hotplug.h"
> >> +#include "hw/acpi/generic_event_device.h"
> >>  #include "hw/pci/pcie_host.h"
> >>  #include "hw/pci/pci.h"
> >>  #include "hw/arm/virt.h"
> >> @@ -705,6 +707,7 @@ static void
> >>  build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState
> >> *vms)  {
> >>      Aml *scope, *dsdt;
> >> +    MachineState *ms = MACHINE(vms);
> >>      const MemMapEntry *memmap = vms->memmap;
> >>      const int *irqmap = vms->irqmap;
> >>
> >> @@ -729,6 +732,19 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> VirtMachineState *vms)
> >>                        vms->highmem, vms->highmem_ecam);
> >>      acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
> >>                         (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
> >> +    if (vms->acpi_dev) {
> >> +        build_ged_aml(scope, "\\_SB."GED_DEVICE,
> >> +                      HOTPLUG_HANDLER(vms->acpi_dev),
> >> +                      irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE,
> AML_SYSTEM_MEMORY,
> >> +                      memmap[VIRT_ACPI_GED].base);
> >> +    }
> >> +
> >> +    if (vms->acpi_dev && ms->ram_slots) {
> >> +        build_memory_hotplug_aml(scope, ms->ram_slots, "\\_SB",
> NULL,
> >> +                                 AML_SYSTEM_MEMORY,
> >> +
> memmap[VIRT_PCDIMM_ACPI].base);
> >> +    }
> >> +
> >>      acpi_dsdt_add_power_button(scope);
> >>
> >>      aml_append(dsdt, scope);
> >> diff --git a/hw/arm/virt.c b/hw/arm/virt.c index
> >> ef65e721d2..0949a227a9 100644
> >> --- a/hw/arm/virt.c
> >> +++ b/hw/arm/virt.c
> >> @@ -66,6 +66,7 @@
> >>  #include "target/arm/internals.h"
> >>  #include "hw/mem/pc-dimm.h"
> >>  #include "hw/mem/nvdimm.h"
> >> +#include "hw/acpi/generic_event_device.h"
> >>
> >>  #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
> >>      static void virt_##major##_##minor##_class_init(ObjectClass *oc,
> >> \ @@ -136,6 +137,8 @@ static const MemMapEntry base_memmap[] = {
> >>      [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
> >>      [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
> >>      [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
> >> +    [VIRT_PCDIMM_ACPI] =        { 0x09070000,
> MEMORY_HOTPLUG_IO_LEN },
> >> +    [VIRT_ACPI_GED] =           { 0x09080000,
> ACPI_GED_EVT_SEL_LEN },
> >>      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
> >>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that
> size */
> >>      [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
> >> @@ -171,6 +174,7 @@ static const int a15irqmap[] = {
> >>      [VIRT_PCIE] = 3, /* ... to 6 */
> >>      [VIRT_GPIO] = 7,
> >>      [VIRT_SECURE_UART] = 8,
> >> +    [VIRT_ACPI_GED] = 9,
> >>      [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
> >>      [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
> >>      [VIRT_SMMU] = 74,    /* ...to 74 + NUM_SMMU_IRQS - 1 */
> >> @@ -520,6 +524,26 @@ static void fdt_add_pmu_nodes(const
> VirtMachineState *vms)
> >>      }
> >>  }
> >>
> >> +static inline DeviceState *create_acpi_ged(VirtMachineState *vms,
> >> +qemu_irq *pic) {
> >> +    DeviceState *dev;
> >> +    int irq = vms->irqmap[VIRT_ACPI_GED];
> >> +    uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT;
> >> +
> >> +    dev = qdev_create(NULL, TYPE_ACPI_GED);
> >> +    qdev_prop_set_uint32(dev, "ged-event", event);
> >> +    object_property_add_child(qdev_get_machine(), "acpi-ged",
> >> +                              OBJECT(dev), NULL);
> Out of curiosity, what is the object_property_add_child() used for?

Right. That is an artifact from the previous versions where GED used to be
inherited from DEVICE type. IIUIC, the purpose was to link it explicitly with
machine object. Now that we are back to SYSBUS, I think we can get rid of it.

Thanks,
Shameer
 
> Thanks
> 
> Eric
> >> +    qdev_init_nofail(dev);
> >> +
> >> +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0,
> vms->memmap[VIRT_ACPI_GED].base);
> >> +    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1,
> >> + vms->memmap[VIRT_PCDIMM_ACPI].base);
> >> +
> >> +    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, pic[irq]);
> >> +
> >> +    return dev;
> >> +}
> >> +
> >>  static void create_its(VirtMachineState *vms, DeviceState *gicdev)
> >> {
> >>      const char *itsclass = its_class_name(); @@ -1483,6 +1507,7 @@
> >> static void machvirt_init(MachineState *machine)
> >>      MemoryRegion *ram = g_new(MemoryRegion, 1);
> >>      bool firmware_loaded;
> >>      bool aarch64 = true;
> >> +    bool has_ged = !vmc->no_ged;
> >>      unsigned int smp_cpus = machine->smp.cpus;
> >>      unsigned int max_cpus = machine->smp.max_cpus;
> >>
> >> @@ -1697,6 +1722,10 @@ static void machvirt_init(MachineState
> >> *machine)
> >>
> >>      create_gpio(vms, pic);
> >>
> >> +    if (has_ged && aarch64 && firmware_loaded && acpi_enabled) {
> >> +        vms->acpi_dev = create_acpi_ged(vms, pic);
> >> +    }
> >> +
> >>      /* Create mmio transports, so the user can create virtio backends
> >>       * (which will be automatically plugged in to the transports). If
> >>       * no backend is created the transport will just sit harmlessly idle.
> >> @@ -1876,14 +1905,23 @@ static const CPUArchIdList
> >> *virt_possible_cpu_arch_ids(MachineState *ms)  static void
> virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> >>                                   Error **errp)  {
> >> +    VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> >> +    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev),
> TYPE_NVDIMM);
> >> +    Error *local_err = NULL;
> >>
> >> -    /*
> >> -     * The device memory is not yet exposed to the Guest either through
> >> -     * DT or ACPI and hence both cold/hot plug of memory is explicitly
> >> -     * disabled for now.
> >> -     */
> >> -    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> >> -        error_setg(errp, "memory cold/hot plug is not yet supported");
> >> +    if (is_nvdimm) {
> >> +        error_setg(errp, "nvdimm is not yet supported");
> >> +        return;
> >> +    }
> >> +
> >> +    if (!vms->acpi_dev) {
> >> +        error_setg(errp, "memory hotplug is not enabled: missing acpi
> device");
> >> +        return;
> >> +    }
> >> +
> >> +    hotplug_handler_pre_plug(HOTPLUG_HANDLER(vms->acpi_dev), dev,
> &local_err);
> >> +    if (local_err) {
> >> +        error_propagate(errp, local_err);
> >>          return;
> >>      }
> >>
> >> @@ -1893,11 +1931,18 @@ 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_dev);
> >> +    hhc->plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
> >> +out:
> >>      error_propagate(errp, local_err);  }
> >>
> >> @@ -2104,8 +2149,11 @@ DEFINE_VIRT_MACHINE_AS_LATEST(4, 2)
> >>
> >>  static void virt_machine_4_1_options(MachineClass *mc)  {
> >> +    VirtMachineClass *vmc =
> VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
> >> +
> >>      virt_machine_4_2_options(mc);
> >>      compat_props_add(mc->compat_props, hw_compat_4_1,
> >> hw_compat_4_1_len);
> >> +    vmc->no_ged = true;
> >>  }
> >>  DEFINE_VIRT_MACHINE(4, 1)
> >>
> >> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h index
> >> a72094204e..577ee49b4b 100644
> >> --- a/include/hw/arm/virt.h
> >> +++ b/include/hw/arm/virt.h
> >> @@ -77,6 +77,8 @@ enum {
> >>      VIRT_GPIO,
> >>      VIRT_SECURE_UART,
> >>      VIRT_SECURE_MEM,
> >> +    VIRT_PCDIMM_ACPI,
> >> +    VIRT_ACPI_GED,
> >>      VIRT_LOWMEMMAP_LAST,
> >>  };
> >>
> >> @@ -106,6 +108,7 @@ typedef struct {
> >>      bool claim_edge_triggered_timers;
> >>      bool smbios_old_sys_ver;
> >>      bool no_highmem_ecam;
> >> +    bool no_ged;   /* Machines < 4.2 has no support for ACPI GED
> device */
> >>  } VirtMachineClass;
> >>
> >>  typedef struct {
> >> @@ -133,6 +136,7 @@ typedef struct {
> >>      uint32_t iommu_phandle;
> >>      int psci_conduit;
> >>      hwaddr highest_gpa;
> >> +    DeviceState *acpi_dev;
> >>  } VirtMachineState;
> >>
> >>  #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM :
> >> VIRT_PCIE_ECAM) diff --git a/tests/bios-tables-test-allowed-diff.h
> >> b/tests/bios-tables-test-allowed-diff.h
> >> index dfb8523c8b..7b4adbc822 100644
> >> --- a/tests/bios-tables-test-allowed-diff.h
> >> +++ b/tests/bios-tables-test-allowed-diff.h
> >> @@ -1 +1,2 @@
> >>  /* List of comma-separated changed AML files to ignore */
> >> +"tests/data/acpi/virt/DSDT",
> >>
> >
diff mbox series

Patch

diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 84961c17ab..ad7f7c089b 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -22,6 +22,8 @@  config ARM_VIRT
     select ACPI_PCI
     select MEM_DEVICE
     select DIMM
+    select ACPI_MEMORY_HOTPLUG
+    select ACPI_HW_REDUCED
 
 config CHEETAH
     bool
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 0afb372769..63fa845076 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -40,6 +40,8 @@ 
 #include "hw/acpi/aml-build.h"
 #include "hw/acpi/utils.h"
 #include "hw/acpi/pci.h"
+#include "hw/acpi/memory_hotplug.h"
+#include "hw/acpi/generic_event_device.h"
 #include "hw/pci/pcie_host.h"
 #include "hw/pci/pci.h"
 #include "hw/arm/virt.h"
@@ -705,6 +707,7 @@  static void
 build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
 {
     Aml *scope, *dsdt;
+    MachineState *ms = MACHINE(vms);
     const MemMapEntry *memmap = vms->memmap;
     const int *irqmap = vms->irqmap;
 
@@ -729,6 +732,19 @@  build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
                       vms->highmem, vms->highmem_ecam);
     acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
                        (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
+    if (vms->acpi_dev) {
+        build_ged_aml(scope, "\\_SB."GED_DEVICE,
+                      HOTPLUG_HANDLER(vms->acpi_dev),
+                      irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE, AML_SYSTEM_MEMORY,
+                      memmap[VIRT_ACPI_GED].base);
+    }
+
+    if (vms->acpi_dev && ms->ram_slots) {
+        build_memory_hotplug_aml(scope, ms->ram_slots, "\\_SB", NULL,
+                                 AML_SYSTEM_MEMORY,
+                                 memmap[VIRT_PCDIMM_ACPI].base);
+    }
+
     acpi_dsdt_add_power_button(scope);
 
     aml_append(dsdt, scope);
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index ef65e721d2..0949a227a9 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -66,6 +66,7 @@ 
 #include "target/arm/internals.h"
 #include "hw/mem/pc-dimm.h"
 #include "hw/mem/nvdimm.h"
+#include "hw/acpi/generic_event_device.h"
 
 #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
     static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
@@ -136,6 +137,8 @@  static const MemMapEntry base_memmap[] = {
     [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
     [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
     [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
+    [VIRT_PCDIMM_ACPI] =        { 0x09070000, MEMORY_HOTPLUG_IO_LEN },
+    [VIRT_ACPI_GED] =           { 0x09080000, ACPI_GED_EVT_SEL_LEN },
     [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
     /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
     [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
@@ -171,6 +174,7 @@  static const int a15irqmap[] = {
     [VIRT_PCIE] = 3, /* ... to 6 */
     [VIRT_GPIO] = 7,
     [VIRT_SECURE_UART] = 8,
+    [VIRT_ACPI_GED] = 9,
     [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
     [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
     [VIRT_SMMU] = 74,    /* ...to 74 + NUM_SMMU_IRQS - 1 */
@@ -520,6 +524,26 @@  static void fdt_add_pmu_nodes(const VirtMachineState *vms)
     }
 }
 
+static inline DeviceState *create_acpi_ged(VirtMachineState *vms, qemu_irq *pic)
+{
+    DeviceState *dev;
+    int irq = vms->irqmap[VIRT_ACPI_GED];
+    uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT;
+
+    dev = qdev_create(NULL, TYPE_ACPI_GED);
+    qdev_prop_set_uint32(dev, "ged-event", event);
+    object_property_add_child(qdev_get_machine(), "acpi-ged",
+                              OBJECT(dev), NULL);
+    qdev_init_nofail(dev);
+
+    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, vms->memmap[VIRT_ACPI_GED].base);
+    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1, vms->memmap[VIRT_PCDIMM_ACPI].base);
+
+    sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, pic[irq]);
+
+    return dev;
+}
+
 static void create_its(VirtMachineState *vms, DeviceState *gicdev)
 {
     const char *itsclass = its_class_name();
@@ -1483,6 +1507,7 @@  static void machvirt_init(MachineState *machine)
     MemoryRegion *ram = g_new(MemoryRegion, 1);
     bool firmware_loaded;
     bool aarch64 = true;
+    bool has_ged = !vmc->no_ged;
     unsigned int smp_cpus = machine->smp.cpus;
     unsigned int max_cpus = machine->smp.max_cpus;
 
@@ -1697,6 +1722,10 @@  static void machvirt_init(MachineState *machine)
 
     create_gpio(vms, pic);
 
+    if (has_ged && aarch64 && firmware_loaded && acpi_enabled) {
+        vms->acpi_dev = create_acpi_ged(vms, pic);
+    }
+
     /* Create mmio transports, so the user can create virtio backends
      * (which will be automatically plugged in to the transports). If
      * no backend is created the transport will just sit harmlessly idle.
@@ -1876,14 +1905,23 @@  static const CPUArchIdList *virt_possible_cpu_arch_ids(MachineState *ms)
 static void virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
                                  Error **errp)
 {
+    VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
+    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
+    Error *local_err = NULL;
 
-    /*
-     * The device memory is not yet exposed to the Guest either through
-     * DT or ACPI and hence both cold/hot plug of memory is explicitly
-     * disabled for now.
-     */
-    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
-        error_setg(errp, "memory cold/hot plug is not yet supported");
+    if (is_nvdimm) {
+        error_setg(errp, "nvdimm is not yet supported");
+        return;
+    }
+
+    if (!vms->acpi_dev) {
+        error_setg(errp, "memory hotplug is not enabled: missing acpi device");
+        return;
+    }
+
+    hotplug_handler_pre_plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
         return;
     }
 
@@ -1893,11 +1931,18 @@  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_dev);
+    hhc->plug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
+out:
     error_propagate(errp, local_err);
 }
 
@@ -2104,8 +2149,11 @@  DEFINE_VIRT_MACHINE_AS_LATEST(4, 2)
 
 static void virt_machine_4_1_options(MachineClass *mc)
 {
+    VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
+
     virt_machine_4_2_options(mc);
     compat_props_add(mc->compat_props, hw_compat_4_1, hw_compat_4_1_len);
+    vmc->no_ged = true;
 }
 DEFINE_VIRT_MACHINE(4, 1)
 
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index a72094204e..577ee49b4b 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -77,6 +77,8 @@  enum {
     VIRT_GPIO,
     VIRT_SECURE_UART,
     VIRT_SECURE_MEM,
+    VIRT_PCDIMM_ACPI,
+    VIRT_ACPI_GED,
     VIRT_LOWMEMMAP_LAST,
 };
 
@@ -106,6 +108,7 @@  typedef struct {
     bool claim_edge_triggered_timers;
     bool smbios_old_sys_ver;
     bool no_highmem_ecam;
+    bool no_ged;   /* Machines < 4.2 has no support for ACPI GED device */
 } VirtMachineClass;
 
 typedef struct {
@@ -133,6 +136,7 @@  typedef struct {
     uint32_t iommu_phandle;
     int psci_conduit;
     hwaddr highest_gpa;
+    DeviceState *acpi_dev;
 } VirtMachineState;
 
 #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
diff --git a/tests/bios-tables-test-allowed-diff.h b/tests/bios-tables-test-allowed-diff.h
index dfb8523c8b..7b4adbc822 100644
--- a/tests/bios-tables-test-allowed-diff.h
+++ b/tests/bios-tables-test-allowed-diff.h
@@ -1 +1,2 @@ 
 /* List of comma-separated changed AML files to ignore */
+"tests/data/acpi/virt/DSDT",