APIC vectors used for direct mode stimers should be valid for lAPIC and just like genuine Hyper-V we should #GP when an illegal one is specified. Add the appropriate check to stimer_set_config() Suggested-by: Roman Kagan <rkagan@xxxxxxxxxxxxx> Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> --- arch/x86/kvm/hyperv.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 0a16a77e6ac3..8723a802e9b7 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -549,6 +549,11 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config, trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id, stimer->index, config, host); + /* Valid vectors for Direct Mode are 16..255. */ + if (new_config.enable && new_config.direct_mode && + new_config.apic_vector < HV_SYNIC_FIRST_VALID_VECTOR) + return 1; + stimer_cleanup(stimer); if (old_config.enable && !new_config.direct_mode && new_config.sintx == 0) -- 2.19.2
