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, 1 insertions, 0 deletions

diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
index 99381639f5..8fd439ec9b 100644
--- a/include/hw/ppc/xive.h
+++ b/include/hw/ppc/xive.h
@@ -416,6 +416,7 @@ uint64_t xive_tctx_tm_read(XiveTCTX *tctx, hwaddr offset, unsigned size);
 void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon);
 Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp);
 void xive_tctx_reset(XiveTCTX *tctx);
+void xive_tctx_destroy(XiveTCTX *tctx);
 
 static inline uint32_t xive_nvt_cam_line(uint8_t nvt_blk, uint32_t nvt_idx)
 {