KVM: ensure APICv is considered inactive if there is no APIC
kvm_vcpu_apicv_active() returns false if a virtual machine has no in-kernel local APIC, however kvm_apicv_activated might still be true if there are no reasons to disable APICv; in fact it is quite likely that there is none because APICv is inhibited by specific configurations of the local APIC and those configurations cannot be programmed. This triggers a WARN: WARN_ON_ONCE(kvm_apicv_activated(vcpu->kvm) != kvm_vcpu_apicv_active(vcpu)); To avoid this, introduce another cause for APICv inhibition, namely the absence of an in-kernel local APIC. This cause is enabled by default, and is dropped by either KVM_CREATE_IRQCHIP or the enabling of KVM_CAP_IRQCHIP_SPLIT. Reported-by:Ignat Korchagin <ignat@cloudflare.com> Fixes: ee49a893 ("KVM: x86: Move SVM's APICv sanity check to common x86", 2021-10-22) Reviewed-by:
Maxim Levitsky <mlevitsk@redhat.com> Reviewed-by:
Sean Christopherson <seanjc@google.com> Tested-by:
Ignat Korchagin <ignat@cloudflare.com> Message-Id: <20211130123746.293379-1-pbonzini@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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