spapr, xics, xive: Move SpaprIrq::reset hook logic into activate/deactivate

It turns out that all the logic in the SpaprIrq::reset hooks (and some in
the SpaprIrq::post_load hooks) isn't really related to resetting the irq
backend (that's handled by the backends' own reset routines).  Rather its
about getting the backend ready to be the active interrupt controller or
stopping being the active interrupt controller - reset (and post_load) is
just the only time that changes at present.

To make this flow clearer, move the logic into the explicit backend
activate and deactivate hooks.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>

1 files changed, 3 insertions, 64 deletions

diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
index 7cd18e5b15..f70b331f44 100644
--- a/hw/ppc/spapr_irq.c
+++ b/hw/ppc/spapr_irq.c
@@ -65,9 +65,9 @@ void spapr_irq_msi_free(SpaprMachineState *spapr, int irq, uint32_t num)
     bitmap_clear(spapr->irq_map, irq - SPAPR_IRQ_MSI, num);
 }
 
-static int spapr_irq_init_kvm(int (*fn)(SpaprInterruptController *, Error **),
-                              SpaprInterruptController *intc,
-                              Error **errp)
+int spapr_irq_init_kvm(int (*fn)(SpaprInterruptController *, Error **),
+                       SpaprInterruptController *intc,
+                       Error **errp)
 {
     MachineState *machine = MACHINE(qdev_get_machine());
     Error *local_err = NULL;
@@ -112,11 +112,6 @@ static int spapr_irq_post_load_xics(SpaprMachineState *spapr, int version_id)
     return 0;
 }
 
-static void spapr_irq_reset_xics(SpaprMachineState *spapr, Error **errp)
-{
-    spapr_irq_init_kvm(xics_kvm_connect, SPAPR_INTC(spapr->ics), errp);
-}
-
 SpaprIrq spapr_irq_xics = {
     .nr_xirqs    = SPAPR_NR_XIRQS,
     .nr_msis     = SPAPR_NR_MSIS,
@@ -124,7 +119,6 @@ SpaprIrq spapr_irq_xics = {
     .xive        = false,
 
     .post_load   = spapr_irq_post_load_xics,
-    .reset       = spapr_irq_reset_xics,
 };
 
 /*
@@ -136,26 +130,6 @@ static int spapr_irq_post_load_xive(SpaprMachineState *spapr, int version_id)
     return spapr_xive_post_load(spapr->xive, version_id);
 }
 
-static void spapr_irq_reset_xive(SpaprMachineState *spapr, Error **errp)
-{
-    CPUState *cs;
-
-    CPU_FOREACH(cs) {
-        PowerPCCPU *cpu = POWERPC_CPU(cs);
-
-        /* (TCG) Set the OS CAM line of the thread interrupt context. */
-        spapr_xive_set_tctx_os_cam(spapr_cpu_state(cpu)->tctx);
-    }
-
-    if (spapr_irq_init_kvm(kvmppc_xive_connect,
-                           SPAPR_INTC(spapr->xive), errp) < 0) {
-        return;
-    }
-
-    /* Activate the XIVE MMIOs */
-    spapr_xive_mmio_set_enabled(spapr->xive, true);
-}
-
 SpaprIrq spapr_irq_xive = {
     .nr_xirqs    = SPAPR_NR_XIRQS,
     .nr_msis     = SPAPR_NR_MSIS,
@@ -163,7 +137,6 @@ SpaprIrq spapr_irq_xive = {
     .xive        = true,
 
     .post_load   = spapr_irq_post_load_xive,
-    .reset       = spapr_irq_reset_xive,
 };
 
 /*
@@ -187,37 +160,9 @@ static SpaprIrq *spapr_irq_current(SpaprMachineState *spapr)
 
 static int spapr_irq_post_load_dual(SpaprMachineState *spapr, int version_id)
 {
-    /*
-     * Force a reset of the XIVE backend after migration. The machine
-     * defaults to XICS at startup.
-     */
-    if (spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
-        if (kvm_irqchip_in_kernel()) {
-            xics_kvm_disconnect(SPAPR_INTC(spapr->ics));
-        }
-        spapr_irq_xive.reset(spapr, &error_fatal);
-    }
-
     return spapr_irq_current(spapr)->post_load(spapr, version_id);
 }
 
-static void spapr_irq_reset_dual(SpaprMachineState *spapr, Error **errp)
-{
-    /*
-     * Deactivate the XIVE MMIOs. The XIVE backend will reenable them
-     * if selected.
-     */
-    spapr_xive_mmio_set_enabled(spapr->xive, false);
-
-    /* Destroy all KVM devices */
-    if (kvm_irqchip_in_kernel()) {
-        xics_kvm_disconnect(SPAPR_INTC(spapr->ics));
-        kvmppc_xive_disconnect(SPAPR_INTC(spapr->xive));
-    }
-
-    spapr_irq_current(spapr)->reset(spapr, errp);
-}
-
 /*
  * Define values in sync with the XIVE and XICS backend
  */
@@ -228,7 +173,6 @@ SpaprIrq spapr_irq_dual = {
     .xive        = true,
 
     .post_load   = spapr_irq_post_load_dual,
-    .reset       = spapr_irq_reset_dual,
 };
 
 
@@ -512,10 +456,6 @@ void spapr_irq_reset(SpaprMachineState *spapr, Error **errp)
     assert(!spapr->irq_map || bitmap_empty(spapr->irq_map, spapr->irq_map_nr));
 
     spapr_irq_update_active_intc(spapr);
-
-    if (spapr->irq->reset) {
-        spapr->irq->reset(spapr, errp);
-    }
 }
 
 int spapr_irq_get_phandle(SpaprMachineState *spapr, void *fdt, Error **errp)
@@ -651,7 +591,6 @@ SpaprIrq spapr_irq_xics_legacy = {
     .xive        = false,
 
     .post_load   = spapr_irq_post_load_xics,
-    .reset       = spapr_irq_reset_xics,
 };
 
 static void spapr_irq_register_types(void)