Re: [Qemu-devel] [Qemu-ppc] [RFC PATCH v1] spapr: Memory hot-unplug support

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Oct 26, 2015 at 03:23:05PM +0530, Bharata B Rao wrote:
> Add support to hot remove pc-dimm memory devices.

Sorry it's taken me so long to look at this.

> TODO: In response to memory hot removal operation on a DIMM device,
> guest kernel might refuse to offline a few LMBs that are part of that device.
> In such cases, we will have a DIMM device that has some LMBs online and some
> LMBs offline. To avoid this situation, drmgr could be enhanced to support
> a command line option that results in removal of all the LMBs or none.

Hm.. what would be the end result of such a situation?  We want to
handle it as gracefully as we can, even if the guest has old tools.
Is there some way we can detect this failure condition, and re-connect
the DIMM?

It does highlight the fact that the PAPR hotplug interface and the
pc-dimm model don't work together terribly well.  I think we have to
try to support it for the sake of management layers, but I do wonder
if we ought to thinkg about an alternative "lmb-pool" backend, where
the precise location of memory blocks isn't so important.  With some
thought such a backend might also be useful for paravirt x86.

Which also makes me think, I wonder if it would be possible to wire up
a PAPR compatible interface to qemu's balloon backend, since in some
ways the PAPR memory hotplug model acts more like a balloon (in that
the guest physical address of removed LMBs isn't usually important to
the host).

Still, we need to get the dimm backed model working first, I guess.

Apart from those overall considerations, the patch looks good.

> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
> ---
> Changes in v1:
> - Got rid of the patch that introduced a field in PCDIMMDevice to track
>   DIMM marked for removal since we can track that using within DRC
>   object.
> - Removed the patch that added return value to rtas_set_indicator()
>   since the required changes are already pushed by Michael Roth.
> 
> v0:
> 
>  hw/ppc/spapr.c     | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  hw/ppc/spapr_drc.c | 18 +++++++++++
>  2 files changed, 107 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index e1202ce..f5b1ac2 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -2174,6 +2174,85 @@ out:
>      error_propagate(errp, local_err);
>  }
>  
> +typedef struct sPAPRDIMMState {
> +    uint32_t nr_lmbs;
> +} sPAPRDIMMState;
> +
> +static void spapr_lmb_release(DeviceState *dev, void *opaque)
> +{
> +    sPAPRDIMMState *ds = (sPAPRDIMMState *)opaque;
> +    HotplugHandler *hotplug_ctrl = NULL;
> +    Error *local_err = NULL;
> +
> +    if (--ds->nr_lmbs) {
> +        return;
> +    }
> +
> +    g_free(ds);
> +
> +    /*
> +     * Now that all the LMBs have been removed by the guest, call the
> +     * pc-dimm unplug handler to cleanup up the pc-dimm device.
> +     */
> +    hotplug_ctrl = qdev_get_hotplug_handler(dev);
> +    hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
> +}
> +
> +static void spapr_del_lmbs(DeviceState *dev, uint64_t addr, uint64_t size,
> +                           Error **errp)
> +{
> +    sPAPRDRConnector *drc;
> +    sPAPRDRConnectorClass *drck;
> +    uint32_t nr_lmbs = size/SPAPR_MEMORY_BLOCK_SIZE;
> +    Error *local_err = NULL;
> +    int i;
> +    sPAPRDIMMState *ds = g_malloc0(sizeof(sPAPRDIMMState));
> +
> +    ds->nr_lmbs = nr_lmbs;
> +    for (i = 0; i < nr_lmbs; i++) {
> +        drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
> +                addr/SPAPR_MEMORY_BLOCK_SIZE);
> +        g_assert(drc);
> +
> +        drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
> +        drck->detach(drc, dev, spapr_lmb_release, ds, &local_err);
> +        addr += SPAPR_MEMORY_BLOCK_SIZE;
> +    }
> +    spapr_hotplug_req_remove_by_count(SPAPR_DR_CONNECTOR_TYPE_LMB, nr_lmbs);
> +}
> +
> +static void spapr_memory_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
> +                                Error **errp)
> +{
> +    sPAPRMachineState *ms = SPAPR_MACHINE(hotplug_dev);
> +    PCDIMMDevice *dimm = PC_DIMM(dev);
> +    PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
> +    MemoryRegion *mr = ddc->get_memory_region(dimm);
> +
> +    pc_dimm_memory_unplug(dev, &ms->hotplug_memory, mr);
> +    object_unparent(OBJECT(dev));
> +}
> +
> +static void spapr_memory_unplug_request(HotplugHandler *hotplug_dev,
> +                                        DeviceState *dev, Error **errp)
> +{
> +    Error *local_err = NULL;
> +    PCDIMMDevice *dimm = PC_DIMM(dev);
> +    PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
> +    MemoryRegion *mr = ddc->get_memory_region(dimm);
> +    uint64_t size = memory_region_size(mr);
> +    uint64_t addr;
> +
> +    addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP, &local_err);
> +    if (local_err) {
> +        goto out;
> +    }
> +
> +    spapr_del_lmbs(dev, addr, size, &local_err);
> +out:
> +    error_propagate(errp, local_err);
> +}
> +
>  static void spapr_machine_device_plug(HotplugHandler *hotplug_dev,
>                                        DeviceState *dev, Error **errp)
>  {
> @@ -2221,7 +2300,15 @@ static void spapr_machine_device_unplug(HotplugHandler *hotplug_dev,
>                                        DeviceState *dev, Error **errp)
>  {
>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> -        error_setg(errp, "Memory hot unplug not supported by sPAPR");
> +        spapr_memory_unplug(hotplug_dev, dev, errp);
> +    }
> +}
> +
> +static void spapr_machine_device_unplug_request(HotplugHandler *hotplug_dev,
> +                                                DeviceState *dev, Error **errp)
> +{
> +    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> +        spapr_memory_unplug_request(hotplug_dev, dev, errp);
>      }
>  }
>  
> @@ -2263,6 +2350,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
>      hc->plug = spapr_machine_device_plug;
>      hc->unplug = spapr_machine_device_unplug;
>      mc->cpu_index_to_socket_id = spapr_cpu_index_to_socket_id;
> +    hc->unplug_request = spapr_machine_device_unplug_request;
>  
>      smc->dr_lmb_enabled = false;
>      fwc->get_dev_path = spapr_get_fw_dev_path;
> diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
> index 5d6ea7c..59b6ea9 100644
> --- a/hw/ppc/spapr_drc.c
> +++ b/hw/ppc/spapr_drc.c
> @@ -11,6 +11,7 @@
>   */
>  
>  #include "hw/ppc/spapr_drc.h"
> +#include "hw/ppc/spapr.h"
>  #include "qom/object.h"
>  #include "hw/qdev.h"
>  #include "qapi/visitor.h"
> @@ -77,6 +78,23 @@ static uint32_t set_isolation_state(sPAPRDRConnector *drc,
>          }
>      }
>  
> +    /*
> +     * Fail any request to ISOLATE the LMB DRC if this LMB doesn't
> +     * belong to a DIMM device that is marked for removal.
> +     *
> +     * Currently the guest userspace tool drmgr that drives the memory
> +     * hotplug/unplug will just try to remove a set of 'removable' LMBs
> +     * in response to a hot unplug request that is based on drc-count.
> +     * If the LMB being removed doesn't belong to a DIMM device that is
> +     * actually being unplugged, fail the isolation request here.
> +     */
> +    if (drc->type == SPAPR_DR_CONNECTOR_TYPE_LMB) {
> +        if ((state == SPAPR_DR_ISOLATION_STATE_ISOLATED) &&
> +             !drc->awaiting_release) {
> +            return RTAS_OUT_HW_ERROR;
> +        }
> +    }
> +
>      drc->isolation_state = state;
>  
>      if (drc->isolation_state == SPAPR_DR_ISOLATION_STATE_ISOLATED) {

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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