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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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9
hw/ppc/spapr.c
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@ -973,7 +973,7 @@ static void *spapr_build_fdt(sPAPRMachineState *spapr,
}
/* /event-sources */
spapr_dt_events(fdt, spapr->check_exception_irq);
spapr_dt_events(spapr, fdt);
/* /rtas */
spapr_dt_rtas(spapr, fdt);
@ -1789,6 +1789,11 @@ static void ppc_spapr_init(MachineState *machine)
spapr_ovec_set(spapr->ov5, OV5_FORM1_AFFINITY);
/* advertise support for dedicated HP event source to guests */
if (spapr->use_hotplug_event_source) {
spapr_ovec_set(spapr->ov5, OV5_HP_EVT);
}
/* init CPUs */
if (machine->cpu_model == NULL) {
machine->cpu_model = kvm_enabled() ? "host" : smc->tcg_default_cpu;
@ -1912,7 +1917,7 @@ static void ppc_spapr_init(MachineState *machine)
}
g_free(filename);
/* Set up EPOW events infrastructure */
/* Set up RTAS event infrastructure */
spapr_events_init(spapr);
/* Set up the RTC RTAS interfaces */