[Qemu-devel] [PATCH 2/7] spapr: Move handling of special NVLink numa node from reset to init

[David Gibson]

The number of NUMA nodes in the system is fixed from the command line.
Therefore, there's no need to recalculate it at reset time, and we can
determine the special gpu_numa_id value used for NVLink2 devices at init
time.

This simplifies the reset path a bit which will make further improvements
easier.

Signed-off-by: David Gibson <address@hidden>
---
 hw/ppc/spapr.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index c551001f86..e03e874d94 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1737,16 +1737,6 @@ static void spapr_machine_reset(MachineState *machine)
         spapr_setup_hpt_and_vrma(spapr);
     }
 
-    /*
-     * NVLink2-connected GPU RAM needs to be placed on a separate NUMA node.
-     * We assign a new numa ID per GPU in spapr_pci_collect_nvgpu() which is
-     * called from vPHB reset handler so we initialize the counter here.
-     * If no NUMA is configured from the QEMU side, we start from 1 as GPU RAM
-     * must be equally distant from any other node.
-     * The final value of spapr->gpu_numa_id is going to be written to
-     * max-associativity-domains in spapr_build_fdt().
-     */
-    spapr->gpu_numa_id = MAX(1, machine->numa_state->num_nodes);
     qemu_devices_reset();
 
     /*
@@ -2885,6 +2875,17 @@ static void spapr_machine_init(MachineState *machine)
 
     }
 
+    /*
+     * NVLink2-connected GPU RAM needs to be placed on a separate NUMA node.
+     * We assign a new numa ID per GPU in spapr_pci_collect_nvgpu() which is
+     * called from vPHB reset handler so we initialize the counter here.
+     * If no NUMA is configured from the QEMU side, we start from 1 as GPU RAM
+     * must be equally distant from any other node.
+     * The final value of spapr->gpu_numa_id is going to be written to
+     * max-associativity-domains in spapr_build_fdt().
+     */
+    spapr->gpu_numa_id = MAX(1, machine->numa_state->num_nodes);
+
     if ((!kvm_enabled() || kvmppc_has_cap_mmu_radix()) &&
         ppc_type_check_compat(machine->cpu_type, CPU_POWERPC_LOGICAL_3_00, 0,
                               spapr->max_compat_pvr)) {
-- 
2.21.0