From 6a91cf04a1177f47a18d3c25873513a1ebfc2fcb Mon Sep 17 00:00:00 2001 From: Igor Mammedov Date: Wed, 19 Oct 2016 14:05:34 +0200 Subject: [PATCH] pc: Leave max apic_id_limit only in legacy cpu hotplug code That's enough to make old code that depends on it to prevent QEMU starting with more than 255 CPUs. Signed-off-by: Igor Mammedov Reviewed-by: Eduardo Habkost Signed-off-by: Eduardo Habkost --- hw/acpi/cpu_hotplug.c | 7 ++++++- hw/i386/pc.c | 6 ------ 2 files changed, 6 insertions(+), 7 deletions(-) diff --git a/hw/acpi/cpu_hotplug.c b/hw/acpi/cpu_hotplug.c index c2ab9b8b2c..f15a2402fc 100644 --- a/hw/acpi/cpu_hotplug.c +++ b/hw/acpi/cpu_hotplug.c @@ -15,6 +15,7 @@ #include "qapi/error.h" #include "qom/cpu.h" #include "hw/i386/pc.h" +#include "qemu/error-report.h" #define CPU_EJECT_METHOD "CPEJ" #define CPU_MAT_METHOD "CPMA" @@ -236,7 +237,11 @@ void build_legacy_cpu_hotplug_aml(Aml *ctx, MachineState *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(pcms->apic_id_limit <= ACPI_CPU_HOTPLUG_ID_LIMIT); + if (pcms->apic_id_limit > ACPI_CPU_HOTPLUG_ID_LIMIT) { + error_report("max_cpus is too large. APIC ID of last CPU is %u", + pcms->apic_id_limit - 1); + exit(1); + } /* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */ dev = aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE)); diff --git a/hw/i386/pc.c b/hw/i386/pc.c index fb8f29c34c..b1f863807b 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1190,12 +1190,6 @@ void pc_cpus_init(PCMachineState *pcms) * This is used for FW_CFG_MAX_CPUS. See comments on bochs_bios_init(). */ pcms->apic_id_limit = x86_cpu_apic_id_from_index(max_cpus - 1) + 1; - if (pcms->apic_id_limit > ACPI_CPU_HOTPLUG_ID_LIMIT) { - error_report("max_cpus is too large. APIC ID of last CPU is %u", - pcms->apic_id_limit - 1); - exit(1); - } - pcms->possible_cpus = g_malloc0(sizeof(CPUArchIdList) + sizeof(CPUArchId) * max_cpus); for (i = 0; i < max_cpus; i++) { -- 2.30.2