[PATCH 1/7] spapr, xics: Get number of servers with a XICSFabricClass method

[Greg Kurz]

The number of servers, ie. upper bound of the highest VCPU id, is
currently only needed to generate the "interrupt-controller" node
in the DT. Soon it will be needed to inform the XICS-on-XIVE KVM
device that it can allocates less resources in the XIVE HW.

Add a method to XICSFabricClass for this purpose. Implement it
for sPAPR and use it to generate the "interrupt-controller" node.

Signed-off-by: Greg Kurz <gr...@kaod.org>
---
 hw/intc/xics.c        |    7 +++++++
 hw/intc/xics_spapr.c  |    3 ++-
 hw/ppc/spapr.c        |    8 ++++++++
 include/hw/ppc/xics.h |    2 ++
 4 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/hw/intc/xics.c b/hw/intc/xics.c
index dfe7dbd254ab..f82072935266 100644
--- a/hw/intc/xics.c
+++ b/hw/intc/xics.c
@@ -716,6 +716,13 @@ ICPState *xics_icp_get(XICSFabric *xi, int server)
     return xic->icp_get(xi, server);
 }
 
+uint32_t xics_nr_servers(XICSFabric *xi)
+{
+    XICSFabricClass *xic = XICS_FABRIC_GET_CLASS(xi);
+
+    return xic->nr_servers(xi);
+}
+
 void ics_set_irq_type(ICSState *ics, int srcno, bool lsi)
 {
     assert(!(ics->irqs[srcno].flags & XICS_FLAGS_IRQ_MASK));
diff --git a/hw/intc/xics_spapr.c b/hw/intc/xics_spapr.c
index 6e5eb24b3cca..aa568ed0dc0d 100644
--- a/hw/intc/xics_spapr.c
+++ b/hw/intc/xics_spapr.c
@@ -311,8 +311,9 @@ static void ics_spapr_realize(DeviceState *dev, Error 
**errp)
 void spapr_dt_xics(SpaprMachineState *spapr, uint32_t nr_servers, void *fdt,
                    uint32_t phandle)
 {
+    ICSState *ics = spapr->ics;
     uint32_t interrupt_server_ranges_prop[] = {
-        0, cpu_to_be32(nr_servers),
+        0, cpu_to_be32(xics_nr_servers(ics->xics)),
     };
     int node;
 
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 514a17ae74d6..b8b9796c88e4 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4266,6 +4266,13 @@ static ICPState *spapr_icp_get(XICSFabric *xi, int 
vcpu_id)
     return cpu ? spapr_cpu_state(cpu)->icp : NULL;
 }
 
+static uint32_t spapr_nr_servers(XICSFabric *xi)
+{
+    SpaprMachineState *spapr = SPAPR_MACHINE(xi);
+
+    return spapr_max_server_number(spapr);
+}
+
 static void spapr_pic_print_info(InterruptStatsProvider *obj,
                                  Monitor *mon)
 {
@@ -4423,6 +4430,7 @@ static void spapr_machine_class_init(ObjectClass *oc, 
void *data)
     xic->ics_get = spapr_ics_get;
     xic->ics_resend = spapr_ics_resend;
     xic->icp_get = spapr_icp_get;
+    xic->nr_servers = spapr_nr_servers;
     ispc->print_info = spapr_pic_print_info;
     /* Force NUMA node memory size to be a multiple of
      * SPAPR_MEMORY_BLOCK_SIZE (256M) since that's the granularity
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index 1e6a9300eb2b..e6bb1239e8f8 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -151,9 +151,11 @@ typedef struct XICSFabricClass {
     ICSState *(*ics_get)(XICSFabric *xi, int irq);
     void (*ics_resend)(XICSFabric *xi);
     ICPState *(*icp_get)(XICSFabric *xi, int server);
+    uint32_t (*nr_servers)(XICSFabric *xi);
 } XICSFabricClass;
 
 ICPState *xics_icp_get(XICSFabric *xi, int server);
+uint32_t xics_nr_servers(XICSFabric *xi);
 
 /* Internal XICS interfaces */
 void icp_set_cppr(ICPState *icp, uint8_t cppr);