Re: [Qemu-devel] [PATCH v2 06/11] hw/arm/virt: Add ACPI support for device memory cold-plug

[Shameerali Kolothum Thodi]

> -----Original Message-----
> From: Auger Eric [mailto:address@hidden
> Sent: 11 March 2019 13:32
> To: Shameerali Kolothum Thodi <address@hidden>;
> address@hidden; address@hidden; address@hidden;
> address@hidden; address@hidden;
> address@hidden; address@hidden
> Cc: Linuxarm <address@hidden>; xuwei (O) <address@hidden>
> Subject: Re: [PATCH v2 06/11] hw/arm/virt: Add ACPI support for device
> memory cold-plug
> 
> Hi Shameer,
> 
> On 3/8/19 12:42 PM, Shameer Kolothum wrote:
> > This adds support to build the aml code so that Guest can see the
> s/Guest/the guest
> > cold-plugged device memory.
> 
> Isn't the colplug part only related to acpi_dsdt_add_memory_hotplug()? I
> understand the patch also adds some hotplug infra?

Hmm..build_memory_hotplug_aml() doesn’t do much if io_base address
Is not initialized. So we need the acpi_memory_hotplug_init().

Also, I think acpi_memory_plug_cb() needs to be called for cold-plugged dimm
otherwise the scan wont detect it.
 
> Can't you just keerp the dsdt additions here, move the virt-acpi changes
> in the original patch and move the virt-acpi instantiation in a
> subsequent patch?

Ok, will take look if there is any scope for reordering this.

Thanks,
Shameer
 
> Thanks
> 
> Eric
> >
> > Signed-off-by: Shameer Kolothum <address@hidden>
> > ---
> >  default-configs/arm-softmmu.mak |  1 +
> >  hw/arm/virt-acpi-build.c        |  9 +++++++++
> >  hw/arm/virt-acpi.c              | 23 +++++++++++++++++++++++
> >  hw/arm/virt.c                   | 11 +++++++++++
> >  include/hw/arm/virt.h           |  2 ++
> >  5 files changed, 46 insertions(+)
> >
> > diff --git a/default-configs/arm-softmmu.mak
> b/default-configs/arm-softmmu.mak
> > index fbc4564..b3bac25 100644
> > --- a/default-configs/arm-softmmu.mak
> > +++ b/default-configs/arm-softmmu.mak
> > @@ -167,3 +167,4 @@ CONFIG_HIGHBANK=y
> >  CONFIG_MUSICPAL=y
> >  CONFIG_MEM_DEVICE=y
> >  CONFIG_DIMM=y
> > +CONFIG_ACPI_MEMORY_HOTPLUG=y
> > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> > index d7e2e48..87d66da 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-acpi.c b/hw/arm/virt-acpi.c
> > index df8a02b..18ebe94 100644
> > --- a/hw/arm/virt-acpi.c
> > +++ b/hw/arm/virt-acpi.c
> > @@ -26,9 +26,11 @@
> >  #include "hw/arm/virt.h"
> >
> >  #include "hw/acpi/acpi.h"
> > +#include "hw/acpi/memory_hotplug.h"
> >
> >  typedef struct VirtAcpiState {
> >      SysBusDevice parent_obj;
> > +    MemHotplugState memhp_state;
> >  } VirtAcpiState;
> >
> >  #define TYPE_VIRT_ACPI "virt-acpi"
> > @@ -44,6 +46,16 @@ static const VMStateDescription vmstate_acpi = {
> >  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_device_unplug_request_cb(HotplugHandler *hotplug_dev,
> > @@ -62,6 +74,15 @@ static void virt_send_ged(AcpiDeviceIf *adev,
> AcpiEventStatusBits ev)
> >
> >  static void virt_device_realize(DeviceState *dev, Error **errp)
> >  {
> > +    VirtMachineState *vms = VIRT_MACHINE(qdev_get_machine());
> > +    const MemMapEntry *memmap = vms->memmap;
> > +    VirtAcpiState *s = VIRT_ACPI(dev);
> > +
> > +    if (s->memhp_state.is_enabled) {
> > +        acpi_memory_hotplug_init(get_system_memory(), OBJECT(dev),
> > +                                 &s->memhp_state,
> > +
> memmap[VIRT_PCDIMM_ACPI].base);
> > +    }
> >  }
> >
> >  DeviceState *virt_acpi_init(void)
> > @@ -70,6 +91,8 @@ DeviceState *virt_acpi_init(void)
> >  }
> >
> >  static Property virt_acpi_properties[] = {
> > +    DEFINE_PROP_BOOL("memory-hotplug-support", VirtAcpiState,
> > +                     memhp_state.is_enabled, true),
> >      DEFINE_PROP_END_OF_LIST(),
> >  };
> >
> > diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> > index 40a1273..9427f4f 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 },
> > @@ -1648,6 +1649,8 @@ static void machvirt_init(MachineState *machine)
> >
> >      create_platform_bus(vms, pic);
> >
> > +    vms->acpi = virt_acpi_init();
> > +
> >      vms->bootinfo.ram_size = machine->ram_size;
> >      vms->bootinfo.kernel_filename = machine->kernel_filename;
> >      vms->bootinfo.kernel_cmdline = machine->kernel_cmdline;
> > @@ -1832,11 +1835,19 @@ 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);
> >
> > +out:
> >      error_propagate(errp, local_err);
> >  }
> >
> > diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
> > index 6076167..e46a051 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)
> >