[Qemu-devel] [PATCH v4 05/10] pc: acpi: SRAT: create only valid processor lapic entries

[Igor Mammedov]

When APIC IDs are sparse*, in addition to valid LAPIC
entries the SRAT is also filled invalid ones for non
possible APIC IDs.
Fix it by asking machine for all possible APIC IDs
instead of wrongly assuming that all APIC IDs in
range 0..apic_id_limit are possible.

* sparse lapic topology CLI:
     -smp x,sockets=2,cores=3,maxcpus=6
Signed-off-by: Igor Mammedov <address@hidden>
Reviewed-by: Eduardo Habkost <address@hidden>
---
 hw/i386/acpi-build.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index c750435..54d2f92 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2376,6 +2376,8 @@ build_srat(GArray *table_data, GArray *linker, 
MachineState *machine)
     uint64_t curnode;
     int srat_start, numa_start, slots;
     uint64_t mem_len, mem_base, next_base;
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
+    CPUArchIdList *apic_ids = mc->possible_cpu_arch_ids(machine);
     PCMachineState *pcms = PC_MACHINE(machine);
     ram_addr_t hotplugabble_address_space_size =
         object_property_get_int(OBJECT(pcms), PC_MACHINE_MEMHP_REGION_SIZE,
@@ -2387,12 +2389,14 @@ build_srat(GArray *table_data, GArray *linker, 
MachineState *machine)
     srat->reserved1 = cpu_to_le32(1);
     core = (void *)(srat + 1);
 
-    for (i = 0; i < pcms->apic_id_limit; ++i) {
+    for (i = 0; i < apic_ids->len; i++) {
+        int apic_id = apic_ids->cpus[i].arch_id;
+
         core = acpi_data_push(table_data, sizeof *core);
         core->type = ACPI_SRAT_PROCESSOR;
         core->length = sizeof(*core);
-        core->local_apic_id = i;
-        curnode = pcms->node_cpu[i];
+        core->local_apic_id = apic_id;
+        curnode = pcms->node_cpu[apic_id];
         core->proximity_lo = curnode;
         memset(core->proximity_hi, 0, 3);
         core->local_sapic_eid = 0;
@@ -2457,6 +2461,7 @@ build_srat(GArray *table_data, GArray *linker, 
MachineState *machine)
                  (void *)(table_data->data + srat_start),
                  "SRAT",
                  table_data->len - srat_start, 1, NULL, NULL);
+    g_free(apic_ids);
 }
 
 static void
-- 
1.8.3.1