From e4faae45bf93c4a79a8ae28238606290e4e9a72d Mon Sep 17 00:00:00 2001 From: Igor Mammedov Date: Mon, 1 Aug 2016 08:11:57 +0200 Subject: [PATCH 57/99] pc: cpu: Consolidate apic-id validity checks in pc_cpu_pre_plug() RH-Author: Igor Mammedov Message-id: <1470039143-24450-53-git-send-email-imammedo@redhat.com> Patchwork-id: 71668 O-Subject: [RHEV-7.3 qemu-kvm-rhev PATCH 52/78] pc: cpu: Consolidate apic-id validity checks in pc_cpu_pre_plug() Bugzilla: 1087672 RH-Acked-by: Marcel Apfelbaum RH-Acked-by: David Gibson RH-Acked-by: Eduardo Habkost Machine code knows about all possible APIC IDs so use that instead of hack which does O(n^2) complexity duplicate checks, interating over global CPUs list. As result duplicate check is done only once with O(log n) complexity. Signed-off-by: Igor Mammedov Reviewed-by: Eduardo Habkost Signed-off-by: Eduardo Habkost (cherry picked from commit 4ec60c76d5ab513e375f17b043d2b9cb849adf6c) Signed-off-by: Miroslav Rezanina --- hw/i386/pc.c | 43 +++++++++++++++++++++++++++++++------------ target-i386/cpu.c | 13 ------------- 2 files changed, 31 insertions(+), 25 deletions(-) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 762d869..f431746 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1074,18 +1074,6 @@ void pc_hot_add_cpu(const int64_t id, Error **errp) return; } - if (cpu_exists(apic_id)) { - error_setg(errp, "Unable to add CPU: %" PRIi64 - ", it already exists", id); - return; - } - - if (id >= max_cpus) { - error_setg(errp, "Unable to add CPU: %" PRIi64 - ", max allowed: %d", id, max_cpus - 1); - return; - } - if (apic_id >= ACPI_CPU_HOTPLUG_ID_LIMIT) { error_setg(errp, "Unable to add CPU: %" PRIi64 ", resulting APIC ID (%" PRIi64 ") is too large", @@ -1780,6 +1768,36 @@ static void pc_cpu_unplug_cb(HotplugHandler *hotplug_dev, error_propagate(errp, local_err); } +static void pc_cpu_pre_plug(HotplugHandler *hotplug_dev, + DeviceState *dev, Error **errp) +{ + int idx; + X86CPU *cpu = X86_CPU(dev); + PCMachineState *pcms = PC_MACHINE(hotplug_dev); + CPUArchId *cpu_slot = pc_find_cpu_slot(pcms, CPU(dev), &idx); + + if (!cpu_slot) { + error_setg(errp, "Invalid CPU index with APIC ID (%" PRIu32 + "), valid range 0:%d", cpu->apic_id, + pcms->possible_cpus->len - 1); + return; + } + + if (cpu_slot->cpu) { + error_setg(errp, "CPU[%d] with APIC ID %" PRIu32 " exists", + idx, cpu->apic_id); + return; + } +} + +static void pc_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev, + DeviceState *dev, Error **errp) +{ + if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) { + pc_cpu_pre_plug(hotplug_dev, dev, errp); + } +} + static void pc_machine_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { @@ -2078,6 +2096,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) /* 240: max CPU count for RHEL */ mc->max_cpus = 240; mc->reset = pc_machine_reset; + hc->pre_plug = pc_machine_device_pre_plug_cb; hc->plug = pc_machine_device_plug_cb; hc->unplug_request = pc_machine_device_unplug_request_cb; hc->unplug = pc_machine_device_unplug_cb; diff --git a/target-i386/cpu.c b/target-i386/cpu.c index 3279790..08a774a 100644 --- a/target-i386/cpu.c +++ b/target-i386/cpu.c @@ -1859,8 +1859,6 @@ static void x86_cpuid_set_apic_id(Object *obj, Visitor *v, const char *name, { X86CPU *cpu = X86_CPU(obj); DeviceState *dev = DEVICE(obj); - const int64_t min = 0; - const int64_t max = UINT32_MAX; Error *error = NULL; int64_t value; @@ -1875,17 +1873,6 @@ static void x86_cpuid_set_apic_id(Object *obj, Visitor *v, const char *name, error_propagate(errp, error); return; } - if (value < min || value > max) { - error_setg(errp, "Property %s.%s doesn't take value %" PRId64 - " (minimum: %" PRId64 ", maximum: %" PRId64 ")" , - object_get_typename(obj), name, value, min, max); - return; - } - - if ((value != cpu->apic_id) && cpu_exists(value)) { - error_setg(errp, "CPU with APIC ID %" PRIi64 " exists", value); - return; - } cpu->apic_id = value; } -- 1.8.3.1