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 | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index ec065177531b..12b6803de1b7 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -630,11 +630,17 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
union hv_stimer_config new_config = {.as_uint64 = config},
old_config = {.as_uint64 = stimer->config.as_uint64};
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
+ struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
if (!synic->active && !host)
return 1;
+ if (unlikely(!host && hv_vcpu->enforce_cpuid && new_config.direct_mode &&
+ !(hv_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);
--
2.31.1
