From 1aa8a4184dbde5f50b70b2c706bcfb6b57da9ea7 Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Fri, 21 May 2021 11:51:53 +0200 Subject: [PATCH] KVM: x86: hyper-v: Honor HV_STIMER_DIRECT_MODE_AVAILABLE privilege bit Synthetic timers can only be configured in 'direct' mode when HV_STIMER_DIRECT_MODE_AVAILABLE bit was exposed. Signed-off-by: Vitaly Kuznetsov Signed-off-by: Paolo Bonzini Message-Id: <20210521095204.2161214-20-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini --- 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 db735692fc62c..1c70303118854 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -631,11 +631,17 @@ 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); -- 2.39.5