ppc: Add intc_destroy() handlers to SpaprInterruptController/PnvChip

SpaprInterruptControllerClass and PnvChipClass have an intc_create() method
that calls the appropriate routine, ie. icp_create() or xive_tctx_create(),
to establish the link between the VCPU and the presenter component of the
interrupt controller during realize.

There aren't any symmetrical call to be called when the VCPU gets unrealized
though. It is assumed that object_unparent() is the only thing to do.

This is questionable because the parenting logic around the CPU and
presenter objects is really an implementation detail of the interrupt
controller. It shouldn't be open-coded in the machine code.

Fix this by adding an intc_destroy() method that undoes what was done in
intc_create(). Also NULLify the presenter pointers to avoid having
stale pointers around. This will allow to reliably check if a vCPU has
a valid presenter.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157192724208.3146912.7254684777515287626.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/hw/ppc/spapr_irq.h b/include/hw/ppc/spapr_irq.h
index 09232999b0..ff814d13de 100644
--- a/include/hw/ppc/spapr_irq.h
+++ b/include/hw/ppc/spapr_irq.h
@@ -53,6 +53,7 @@ typedef struct SpaprInterruptControllerClass {
     int (*cpu_intc_create)(SpaprInterruptController *intc,
                             PowerPCCPU *cpu, Error **errp);
     void (*cpu_intc_reset)(SpaprInterruptController *intc, PowerPCCPU *cpu);
+    void (*cpu_intc_destroy)(SpaprInterruptController *intc, PowerPCCPU *cpu);
     int (*claim_irq)(SpaprInterruptController *intc, int irq, bool lsi,
                      Error **errp);
     void (*free_irq)(SpaprInterruptController *intc, int irq);
@@ -70,6 +71,7 @@ void spapr_irq_update_active_intc(SpaprMachineState *spapr);
 int spapr_irq_cpu_intc_create(SpaprMachineState *spapr,
                               PowerPCCPU *cpu, Error **errp);
 void spapr_irq_cpu_intc_reset(SpaprMachineState *spapr, PowerPCCPU *cpu);
+void spapr_irq_cpu_intc_destroy(SpaprMachineState *spapr, PowerPCCPU *cpu);
 void spapr_irq_print_info(SpaprMachineState *spapr, Monitor *mon);
 void spapr_irq_dt(SpaprMachineState *spapr, uint32_t nr_servers,
                   void *fdt, uint32_t phandle);