fd38804b38
In racing situations between hotplug events and migration operation, a rtas hotplug event could have not yet be delivered to the source guest when migration is started. In this case the pending_events of spapr state need be transmitted to the target so that the hotplug event can be finished on the target. To achieve the minimal VMSD possible to migrate the pending_events list, this patch makes the changes in spapr_events.c: - 'log_type' of sPAPREventLogEntry struct deleted. This information can be derived by inspecting the rtas_error_log summary field. A new function called 'spapr_event_log_entry_type' was added to retrieve the type of a given sPAPREventLogEntry. - sPAPREventLogEntry, epow_log_full and hp_log_full were redesigned. The only data we're going to migrate in the VMSD is the event log data itself, which can be divided in two parts: a rtas_error_log header and an extended event log field. The rtas_error_log header contains information about the size of the extended log field, which can be used inside VMSD as the size parameter of the VBUFFER_ALOC field that will store it. To allow this use, the header.extended_length field must be exposed inline to the VMSD instead of embedded into a 'data' field that holds everything. With this in mind, the following changes were done: * a new 'header' field was added to sPAPREventLogEntry. This field holds a a struct rtas_error_log inline. * the declaration of the 'rtas_error_log' struct was moved to spapr.h to be visible to the VMSD macros. * 'data' field of sPAPREventLogEntry was renamed to 'extended_log' and now holds only the contents of the extended event log. * 'struct rtas_error_log hdr' were taken away from both epow_log_full and hp_log_full. This information is now available at the header field of sPAPREventLogEntry. * epow_log_full and hp_log_full were renamed to epow_extended_log and hp_extended_log respectively. This rename makes it clearer to understand the new purpose of both structures: hold the information of an extended event log field. * spapr_powerdown_req and spapr_hotplug_req_event now creates a sPAPREventLogEntry structure that contains the full rtas log entry. * rtas_event_log_queue and rtas_event_log_dequeue now receives a sPAPREventLogEntry pointer as a parameter instead of a void pointer. - the endianess of the sPAPREventLogEntry header is now native instead of be32. We can use the fields in native endianess internally and write them in be32 in the guest physical memory inside 'check_exception'. This allows the VMSD inside spapr.c to read the correct size of the entended_log field. - inside spapr.c, pending_events is put in a subsection in the spapr state VMSD to make sure migration across different versions is not broken. A small change in rtas_event_log_queue and rtas_event_log_dequeue were also made: instead of calling qdev_get_machine(), both functions now receive a pointer to the sPAPRMachineState. This pointer is already available in the callers of these functions and we don't need to waste resources calling qdev() again. Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> |
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fdt.h | ||
mac_dbdma.h | ||
openpic.h | ||
pnv_core.h | ||
pnv_lpc.h | ||
pnv_occ.h | ||
pnv_psi.h | ||
pnv_xscom.h | ||
pnv.h | ||
ppc4xx.h | ||
ppc_e500.h | ||
ppc.h | ||
spapr_cpu_core.h | ||
spapr_drc.h | ||
spapr_ovec.h | ||
spapr_rtas.h | ||
spapr_vio.h | ||
spapr.h | ||
xics.h |