[Qemu-devel] [PULL 38/53] pc: acpi: create Processor and Notify objects only for valid lapics

[Michael S. Tsirkin]

From: Igor Mammedov <address@hidden>

do not assume that all lapics in range 0..apic_id_limit
are valid and do not create Processor and Notify objects
for not possible lapics.

Signed-off-by: Igor Mammedov <address@hidden>
Reviewed-by: Eduardo Habkost <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
 hw/i386/acpi-build.c | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index e852075..e94f9fb 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -965,7 +965,7 @@ static Aml *build_crs(PCIHostState *host,
     return crs;
 }
 
-static void build_processor_devices(Aml *sb_scope, unsigned acpi_cpus,
+static void build_processor_devices(Aml *sb_scope, MachineState *machine,
                                     AcpiCpuInfo *cpu, AcpiPmInfo *pm)
 {
     int i;
@@ -975,11 +975,14 @@ static void build_processor_devices(Aml *sb_scope, 
unsigned acpi_cpus,
     Aml *field;
     Aml *ifctx;
     Aml *method;
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
+    CPUArchIdList *apic_ids = mc->possible_cpu_arch_ids(machine);
+    PCMachineState *pcms = PC_MACHINE(machine);
 
     /* The current AML generator can cover the APIC ID range [0..255],
      * inclusive, for VCPU hotplug. */
     QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256);
-    g_assert(acpi_cpus <= ACPI_CPU_HOTPLUG_ID_LIMIT);
+    g_assert(pcms->apic_id_limit <= ACPI_CPU_HOTPLUG_ID_LIMIT);
 
     /* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */
     dev = aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE));
@@ -1004,22 +1007,26 @@ static void build_processor_devices(Aml *sb_scope, 
unsigned acpi_cpus,
     aml_append(sb_scope, field);
 
     /* build Processor object for each processor */
-    for (i = 0; i < acpi_cpus; i++) {
-        dev = aml_processor(i, 0, 0, "CP%.02X", i);
+    for (i = 0; i < apic_ids->len; i++) {
+        int apic_id = apic_ids->cpus[i].arch_id;
+
+        assert(apic_id < ACPI_CPU_HOTPLUG_ID_LIMIT);
+        dev = aml_processor(apic_id, 0, 0, "CP%.02X", apic_id);
 
         method = aml_method("_MAT", 0, AML_NOTSERIALIZED);
         aml_append(method,
-            aml_return(aml_call1(CPU_MAT_METHOD, aml_int(i))));
+            aml_return(aml_call1(CPU_MAT_METHOD, aml_int(apic_id))));
         aml_append(dev, method);
 
         method = aml_method("_STA", 0, AML_NOTSERIALIZED);
         aml_append(method,
-            aml_return(aml_call1(CPU_STATUS_METHOD, aml_int(i))));
+            aml_return(aml_call1(CPU_STATUS_METHOD, aml_int(apic_id))));
         aml_append(dev, method);
 
         method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
         aml_append(method,
-            aml_return(aml_call2(CPU_EJECT_METHOD, aml_int(i), aml_arg(0)))
+            aml_return(aml_call2(CPU_EJECT_METHOD, aml_int(apic_id),
+                aml_arg(0)))
         );
         aml_append(dev, method);
 
@@ -1031,10 +1038,12 @@ static void build_processor_devices(Aml *sb_scope, 
unsigned acpi_cpus,
      */
     /* Arg0 = Processor ID = APIC ID */
     method = aml_method(AML_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
-    for (i = 0; i < acpi_cpus; i++) {
-        ifctx = aml_if(aml_equal(aml_arg(0), aml_int(i)));
+    for (i = 0; i < apic_ids->len; i++) {
+        int apic_id = apic_ids->cpus[i].arch_id;
+
+        ifctx = aml_if(aml_equal(aml_arg(0), aml_int(apic_id)));
         aml_append(ifctx,
-            aml_notify(aml_name("CP%.02X", i), aml_arg(1))
+            aml_notify(aml_name("CP%.02X", apic_id), aml_arg(1))
         );
         aml_append(method, ifctx);
     }
@@ -1047,14 +1056,15 @@ static void build_processor_devices(Aml *sb_scope, 
unsigned acpi_cpus,
      * ith up to 255 elements. Windows guests up to win2k8 fail when
      * VarPackageOp is used.
      */
-    pkg = acpi_cpus <= 255 ? aml_package(acpi_cpus) :
-                             aml_varpackage(acpi_cpus);
+    pkg = pcms->apic_id_limit <= 255 ? aml_package(pcms->apic_id_limit) :
+                                       aml_varpackage(pcms->apic_id_limit);
 
-    for (i = 0; i < acpi_cpus; i++) {
+    for (i = 0; i < pcms->apic_id_limit; i++) {
         uint8_t b = test_bit(i, cpu->found_cpus) ? 0x01 : 0x00;
         aml_append(pkg, aml_int(b));
     }
     aml_append(sb_scope, aml_name_decl(CPU_ON_BITMAP, pkg));
+    g_free(apic_ids);
 }
 
 static void build_memory_devices(Aml *sb_scope, int nr_mem,
@@ -2327,7 +2337,7 @@ build_dsdt(GArray *table_data, GArray *linker,
 
     sb_scope = aml_scope("\\_SB");
     {
-        build_processor_devices(sb_scope, pcms->apic_id_limit, cpu, pm);
+        build_processor_devices(sb_scope, machine, cpu, pm);
 
         build_memory_devices(sb_scope, nr_mem, pm->mem_hp_io_base,
                              pm->mem_hp_io_len);
-- 
MST