diff options
| -rw-r--r-- | arch/x86/kvm/lapic.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 9aca006b2d22..814b65106057 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -3114,13 +3114,17 @@ static int kvm_lapic_msr_read(struct kvm_lapic *apic, u32 reg, u64 *data) static int kvm_lapic_msr_write(struct kvm_lapic *apic, u32 reg, u64 data) { /* - * ICR is a 64-bit register in x2APIC mode (and Hyper'v PV vAPIC) and + * ICR is a 64-bit register in x2APIC mode (and Hyper-V PV vAPIC) and * can be written as such, all other registers remain accessible only * through 32-bit reads/writes. */ if (reg == APIC_ICR) return kvm_x2apic_icr_write(apic, data); + /* Bits 63:32 are reserved in all other registers. */ + if (data >> 32) + return 1; + return kvm_lapic_reg_write(apic, reg, (u32)data); } |