Synthetic timers can only be configured in 'direct' mode when HV_STIMER_DIRECT_MODE_AVAILABLE bit was exposed. 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 1299847c89ba..0df18187d908 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -646,6 +646,11 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config, HV_MSR_SYNTIMER_AVAILABLE)))) return 1; + if (unlikely(!host && new_config.direct_mode && + !(to_hv_vcpu(vcpu)->cpuid_cache.features_edx & + HV_STIMER_DIRECT_MODE_AVAILABLE))) + return 1; + trace_kvm_hv_stimer_set_config(hv_stimer_to_vcpu(stimer)->vcpu_id, stimer->index, config, host); -- 2.30.2
