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spapr_events: add support for dedicated hotplug event source

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Hotplug events were previously delivered using an EPOW interrupt
and were queued by linux guests into a circular buffer. For traditional
EPOW events like shutdown/resets, this isn't an issue, but for hotplug
events there are cases where this buffer can be exhausted, resulting
in the loss of hotplug events, resets, etc.

Newer-style hotplug event are delivered using a dedicated event source.
We enable this in supported guests by adding standard an additional
event source in the guest device-tree via /event-sources, and, if
the guest advertises support for the newer-style hotplug events,
using the corresponding interrupt to signal the available of
hotplug/unplug events.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Michael Roth 2016-10-26 21:20:26 -05:00 • committed by David Gibson
parent 9f992cca93
commit ffbb1705a3
4 changed files with 177 additions and 41 deletions
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6
include/hw/ppc/spapr.h
View file

@ -13,6 +13,7 @@ struct sPAPRPHBState;
struct sPAPRNVRAM;
typedef struct sPAPRConfigureConnectorState sPAPRConfigureConnectorState;
typedef struct sPAPREventLogEntry sPAPREventLogEntry;
typedef struct sPAPREventSource sPAPREventSource;
#define HPTE64_V_HPTE_DIRTY 0x0000000000000040ULL
#define SPAPR_ENTRY_POINT 0x100
@ -77,9 +78,10 @@ struct sPAPRMachineState {
sPAPROptionVector *ov5_cas; /* negotiated (via CAS) option vectors */
bool cas_reboot;
uint32_t check_exception_irq;
Notifier epow_notifier;
QTAILQ_HEAD(, sPAPREventLogEntry) pending_events;
bool use_hotplug_event_source;
sPAPREventSource *event_sources;
/* Migration state */
int htab_save_index;
@ -584,7 +586,7 @@ struct sPAPREventLogEntry {
};
void spapr_events_init(sPAPRMachineState *sm);
void spapr_dt_events(void *fdt, uint32_t check_exception_irq);
void spapr_dt_events(sPAPRMachineState *sm, void *fdt);
int spapr_h_cas_compose_response(sPAPRMachineState *sm,
target_ulong addr, target_ulong size,
bool cpu_update,