[PATCH for-5.0 v5 14/23] ppc/spapr: Implement the XiveFabric interface

["Cédric Le Goater" <clg@kaod.org>]

The CAM line matching sequence in the pseries machine does not change
much apart from the use of the new QOM interfaces. There is an extra
indirection because of the sPAPR IRQ backend of the machine. Only the
XIVE backend implements the new 'match_nvt' handler.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/ppc/spapr.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 94f9d27096af..a8f5850f65bb 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4270,6 +4270,39 @@ static void spapr_pic_print_info(InterruptStatsProvider *obj,
                    kvm_irqchip_in_kernel() ? "in-kernel" : "emulated");
 }
 
+static int spapr_xive_match_nvt(XiveFabric *xfb, uint8_t format,
+                                uint8_t nvt_blk, uint32_t nvt_idx,
+                                bool cam_ignore, uint8_t priority,
+                                uint32_t logic_serv, XiveTCTXMatch *match)
+{
+    SpaprMachineState *spapr = SPAPR_MACHINE(xfb);
+    XivePresenter *xptr = XIVE_PRESENTER(spapr->xive);
+    XivePresenterClass *xpc = XIVE_PRESENTER_GET_CLASS(xptr);
+    int count;
+
+    count = xpc->match_nvt(xptr, format, nvt_blk, nvt_idx, cam_ignore,
+                           priority, logic_serv, match);
+    if (count < 0) {
+        return count;
+    }
+
+    /*
+     * When we implement the save and restore of the thread interrupt
+     * contexts in the enter/exit CPU handlers of the machine and the
+     * escalations in QEMU, we should be able to handle non dispatched
+     * vCPUs.
+     *
+     * Until this is done, the sPAPR machine should find at least one
+     * matching context always.
+     */
+    if (count == 0) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVT %x/%x is not dispatched\n",
+                      nvt_blk, nvt_idx);
+    }
+
+    return count;
+}
+
 int spapr_get_vcpu_id(PowerPCCPU *cpu)
 {
     return cpu->vcpu_id;
@@ -4366,6 +4399,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
     PPCVirtualHypervisorClass *vhc = PPC_VIRTUAL_HYPERVISOR_CLASS(oc);
     XICSFabricClass *xic = XICS_FABRIC_CLASS(oc);
     InterruptStatsProviderClass *ispc = INTERRUPT_STATS_PROVIDER_CLASS(oc);
+    XiveFabricClass *xfc = XIVE_FABRIC_CLASS(oc);
 
     mc->desc = "pSeries Logical Partition (PAPR compliant)";
     mc->ignore_boot_device_suffixes = true;
@@ -4442,6 +4476,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
     smc->linux_pci_probe = true;
     smc->smp_threads_vsmt = true;
     smc->nr_xirqs = SPAPR_NR_XIRQS;
+    xfc->match_nvt = spapr_xive_match_nvt;
 }
 
 static const TypeInfo spapr_machine_info = {
@@ -4460,6 +4495,7 @@ static const TypeInfo spapr_machine_info = {
         { TYPE_PPC_VIRTUAL_HYPERVISOR },
         { TYPE_XICS_FABRIC },
         { TYPE_INTERRUPT_STATS_PROVIDER },
+        { TYPE_XIVE_FABRIC },
         { }
     },
 };
-- 
2.21.0