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spapr: ensure device trees are always associated with DRC

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There are possible racing situations involving hotplug events and
guest migration. For cases where a hotplug event is migrated, or
the guest is in the process of fetching device tree at the time of
migration, we need to ensure the device tree is created and
associated with the corresponding DRC for devices that were
hotplugged on the source, but 'coldplugged' on the target.

Signed-off-by: Jianjun Duan <duanj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Jianjun Duan 2016-05-24 10:55:04 -07:00 committed by David Gibson
parent 41264b385c
commit 5dd5238c0b
2 changed files with 11 additions and 17 deletions
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14
hw/ppc/spapr.c
View File

@ -2136,15 +2136,6 @@ static void spapr_add_lmbs(DeviceState *dev, uint64_t addr, uint64_t size,
int i, fdt_offset, fdt_size;
void *fdt;
/*
* Check for DRC connectors and send hotplug notification to the
* guest only in case of hotplugged memory. This allows cold plugged
* memory to be specified at boot time.
*/
if (!dev->hotplugged) {
return;
}
for (i = 0; i < nr_lmbs; i++) {
drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
addr/SPAPR_MEMORY_BLOCK_SIZE);
@ -2158,7 +2149,12 @@ static void spapr_add_lmbs(DeviceState *dev, uint64_t addr, uint64_t size,
drck->attach(drc, dev, fdt, fdt_offset, !dev->hotplugged, errp);
addr += SPAPR_MEMORY_BLOCK_SIZE;
}
/* send hotplug notification to the
* guest only in case of hotplugged memory
*/
if (dev->hotplugged) {
spapr_hotplug_req_add_by_count(SPAPR_DR_CONNECTOR_TYPE_LMB, nr_lmbs);
}
}
static void spapr_memory_plug(HotplugHandler *hotplug_dev, DeviceState *dev,

2
hw/ppc/spapr_pci.c
View File

@ -1093,14 +1093,12 @@ static void spapr_phb_add_pci_device(sPAPRDRConnector *drc,
spapr_tce_set_need_vfio(tcet, true);
}
if (dev->hotplugged) {
fdt = create_device_tree(&fdt_size);
fdt_start_offset = spapr_create_pci_child_dt(phb, pdev, fdt, 0);
if (!fdt_start_offset) {
error_setg(errp, "Failed to create pci child device tree node");
goto out;
}
}
drck->attach(drc, DEVICE(pdev),
fdt, fdt_start_offset, !dev->hotplugged, errp);