Hi Shameer,
On 3/21/19 11:47 AM, Shameer Kolothum wrote:
> From: Eric Auger <eric.au...@redhat.com>
>
> This patch adds the the memory hot-plug/hot-unplug infrastructure
s/the the/the (sorry my fault)
> in machvirt. It is still not enabled as device memory is not yet
> reported to guest.
s/ reported to guest / exposed to the guest either through DT or ACPI.
Note even cold-plug would not work yet.
>
> Signed-off-by: Eric Auger <eric.au...@redhat.com>
> Signed-off-by: Kwangwoo Lee <kwangwoo....@sk.com>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.th...@huawei.com>
> ---
> default-configs/arm-softmmu.mak | 3 +++
> hw/arm/virt.c | 53
> ++++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 55 insertions(+), 1 deletion(-)
>
> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
> index 2a7efc1..795cb89 100644
> --- a/default-configs/arm-softmmu.mak
> +++ b/default-configs/arm-softmmu.mak
> @@ -159,3 +159,6 @@ CONFIG_MUSICPAL=y
>
> # for realview and versatilepb
> CONFIG_LSI_SCSI_PCI=y
> +
> +CONFIG_MEM_DEVICE=y
> +CONFIG_DIMM=y
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index ce2664a..d0ff20d 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -61,6 +61,8 @@
> #include "hw/arm/smmuv3.h"
> #include "hw/acpi/acpi.h"
> #include "target/arm/internals.h"
> +#include "hw/mem/pc-dimm.h"
> +#include "hw/mem/nvdimm.h"
>
> #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
> static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
> @@ -1806,6 +1808,42 @@ static const CPUArchIdList
> *virt_possible_cpu_arch_ids(MachineState *ms)
> return ms->possible_cpus;
> }
>
> +static void virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState
> *dev,
> + Error **errp)
> +{
> + const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
> +
> + if (dev->hotplugged) {
> + error_setg(errp, "memory hotplug is not supported");
> + }
> +
> + if (is_nvdimm) {
> + error_setg(errp, "nvdimm is not yet supported");
> + return;
> + }
Maybe this patch should be moved at the end since from this patch
onwards, it becomes possible to instantiate a DIMM slot (with cold-plug
qemu command line) that won't work properly. Of we simply disable
cold-plug for PCDIMM as well at the moment?
Thanks
Eric
> +
> + pc_dimm_pre_plug(PC_DIMM(dev), MACHINE(hotplug_dev), NULL, errp);
> +}
> +
> +static void virt_memory_plug(HotplugHandler *hotplug_dev,
> + DeviceState *dev, Error **errp)
> +{
> + VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> + Error *local_err = NULL;
> +
> + pc_dimm_plug(PC_DIMM(dev), MACHINE(vms), &local_err);
> +
> + error_propagate(errp, local_err);
> +}
> +
> +static void virt_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
> + DeviceState *dev, Error **errp)
> +{
> + if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> + virt_memory_pre_plug(hotplug_dev, dev, errp);
> + }
> +}
> +
> static void virt_machine_device_plug_cb(HotplugHandler *hotplug_dev,
> DeviceState *dev, Error **errp)
> {
> @@ -1817,12 +1855,23 @@ static void
> virt_machine_device_plug_cb(HotplugHandler *hotplug_dev,
> SYS_BUS_DEVICE(dev));
> }
> }
> + if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> + virt_memory_plug(hotplug_dev, dev, errp);
> + }
> +}
> +
> +static void virt_machine_device_unplug_request_cb(HotplugHandler
> *hotplug_dev,
> + DeviceState *dev, Error **errp)
> +{
> + error_setg(errp, "device unplug request for unsupported device"
> + " type: %s", object_get_typename(OBJECT(dev)));
> }
>
> static HotplugHandler *virt_machine_get_hotplug_handler(MachineState
> *machine,
> DeviceState *dev)
> {
> - if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE)) {
> + if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE) ||
> + (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM))) {
> return HOTPLUG_HANDLER(machine);
> }
>
> @@ -1886,7 +1935,9 @@ static void virt_machine_class_init(ObjectClass *oc,
> void *data)
> mc->kvm_type = virt_kvm_type;
> assert(!mc->get_hotplug_handler);
> mc->get_hotplug_handler = virt_machine_get_hotplug_handler;
> + hc->pre_plug = virt_machine_device_pre_plug_cb;
> hc->plug = virt_machine_device_plug_cb;
> + hc->unplug_request = virt_machine_device_unplug_request_cb;
> }
>
> static void virt_instance_init(Object *obj)
>
