diff options
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 8a81a681836..544673304de 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1598,6 +1598,14 @@ void __init enable_IR_x2apic(void) int ret, x2apic_enabled = 0; int hardware_init_ret; + if (!IS_ENABLED(CONFIG_X86_X2APIC)) { + u64 msr; + + rdmsrl(MSR_IA32_APICBASE, msr); + if (msr & X2APIC_ENABLE) + panic("BIOS has enabled x2apic but kernel doesn't support x2apic, please disable x2apic in BIOS.\n"); + } + hardware_init_ret = irq_remapping_prepare(); if (hardware_init_ret && !x2apic_supported()) return; |