ppc: Reset the interrupt presenter from the CPU reset handler

On the sPAPR machine and PowerNV machine, the interrupt presenters are
created by a machine handler at the core level and are reset
independently. This is not consistent and it raises issues when it
comes to handle hot-plugged CPUs. In that case, the presenters are not
reset. This is less of an issue in XICS, although a zero MFFR could
be a concern, but in XIVE, the OS CAM line is not set and this breaks
the presenting algorithm. The current code has workarounds which need
a global cleanup.

Extend the sPAPR IRQ backend and the PowerNV Chip class with a new
cpu_intc_reset() handler called by the CPU reset handler and remove
the XiveTCTX reset handler which is now redundant.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191022163812.330-6-clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

4 files changed, 19 insertions, 17 deletions

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index ba32d2cc5b..20a8d8285f 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -553,6 +553,14 @@ static int spapr_xive_cpu_intc_create(SpaprInterruptController *intc,
     return 0;
 }
 
+static void spapr_xive_cpu_intc_reset(SpaprInterruptController *intc,
+                                     PowerPCCPU *cpu)
+{
+    XiveTCTX *tctx = spapr_cpu_state(cpu)->tctx;
+
+    xive_tctx_reset(tctx);
+}
+
 static void spapr_xive_set_irq(SpaprInterruptController *intc, int irq, int val)
 {
     SpaprXive *xive = SPAPR_XIVE(intc);
@@ -697,6 +705,7 @@ static void spapr_xive_class_init(ObjectClass *klass, void *data)
     sicc->activate = spapr_xive_activate;
     sicc->deactivate = spapr_xive_deactivate;
     sicc->cpu_intc_create = spapr_xive_cpu_intc_create;
+    sicc->cpu_intc_reset = spapr_xive_cpu_intc_reset;
     sicc->claim_irq = spapr_xive_claim_irq;
     sicc->free_irq = spapr_xive_free_irq;
     sicc->set_irq = spapr_xive_set_irq;
diff --git a/hw/intc/xics.c b/hw/intc/xics.c
index b5ac408f7b..6da05763f9 100644
--- a/hw/intc/xics.c
+++ b/hw/intc/xics.c
@@ -274,10 +274,8 @@ static const VMStateDescription vmstate_icp_server = {
     },
 };
 
-static void icp_reset_handler(void *dev)
+void icp_reset(ICPState *icp)
 {
-    ICPState *icp = ICP(dev);
-
     icp->xirr = 0;
     icp->pending_priority = 0xff;
     icp->mfrr = 0xff;
@@ -288,7 +286,7 @@ static void icp_reset_handler(void *dev)
     if (kvm_irqchip_in_kernel()) {
         Error *local_err = NULL;
 
-        icp_set_kvm_state(ICP(dev), &local_err);
+        icp_set_kvm_state(icp, &local_err);
         if (local_err) {
             error_report_err(local_err);
         }
@@ -351,7 +349,6 @@ static void icp_realize(DeviceState *dev, Error **errp)
         }
     }
 
-    qemu_register_reset(icp_reset_handler, dev);
     vmstate_register(NULL, icp->cs->cpu_index, &vmstate_icp_server, icp);
 }
 
@@ -360,7 +357,6 @@ static void icp_unrealize(DeviceState *dev, Error **errp)
     ICPState *icp = ICP(dev);
 
     vmstate_unregister(NULL, &vmstate_icp_server, icp);
-    qemu_unregister_reset(icp_reset_handler, dev);
 }
 
 static void icp_class_init(ObjectClass *klass, void *data)
diff --git a/hw/intc/xics_spapr.c b/hw/intc/xics_spapr.c
index 4f64b9a9fc..7418fb9f37 100644
--- a/hw/intc/xics_spapr.c
+++ b/hw/intc/xics_spapr.c
@@ -346,6 +346,12 @@ static int xics_spapr_cpu_intc_create(SpaprInterruptController *intc,
     return 0;
 }
 
+static void xics_spapr_cpu_intc_reset(SpaprInterruptController *intc,
+                                     PowerPCCPU *cpu)
+{
+    icp_reset(spapr_cpu_state(cpu)->icp);
+}
+
 static int xics_spapr_claim_irq(SpaprInterruptController *intc, int irq,
                                 bool lsi, Error **errp)
 {
@@ -433,6 +439,7 @@ static void ics_spapr_class_init(ObjectClass *klass, void *data)
     sicc->activate = xics_spapr_activate;
     sicc->deactivate = xics_spapr_deactivate;
     sicc->cpu_intc_create = xics_spapr_cpu_intc_create;
+    sicc->cpu_intc_reset = xics_spapr_cpu_intc_reset;
     sicc->claim_irq = xics_spapr_claim_irq;
     sicc->free_irq = xics_spapr_free_irq;
     sicc->set_irq = xics_spapr_set_irq;
diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index d420c6571e..f066be5eb5 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -547,10 +547,8 @@ void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon)
     }
 }
 
-static void xive_tctx_reset(void *dev)
+void xive_tctx_reset(XiveTCTX *tctx)
 {
-    XiveTCTX *tctx = XIVE_TCTX(dev);
-
     memset(tctx->regs, 0, sizeof(tctx->regs));
 
     /* Set some defaults */
@@ -607,13 +605,6 @@ static void xive_tctx_realize(DeviceState *dev, Error **errp)
             return;
         }
     }
-
-    qemu_register_reset(xive_tctx_reset, dev);
-}
-
-static void xive_tctx_unrealize(DeviceState *dev, Error **errp)
-{
-    qemu_unregister_reset(xive_tctx_reset, dev);
 }
 
 static int vmstate_xive_tctx_pre_save(void *opaque)
@@ -668,7 +659,6 @@ static void xive_tctx_class_init(ObjectClass *klass, void *data)
 
     dc->desc = "XIVE Interrupt Thread Context";
     dc->realize = xive_tctx_realize;
-    dc->unrealize = xive_tctx_unrealize;
     dc->vmsd = &vmstate_xive_tctx;
     /*
      * Reason: part of XIVE interrupt controller, needs to be wired up