On 06/09/2013 04:45 PM, Gleb Natapov wrote:
> +static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
> +{
> + struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
> + return kvm_exec_with_stopped_vcpu(vcpu->kvm,
> + emulator_fix_hypercall_cb, ctxt);
> +}
> +
> +
> /*
> * Check if userspace requested an interrupt window, and that the
> * interrupt window is open.
> @@ -5761,6 +5769,10 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
> kvm_deliver_pmi(vcpu);
> if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu))
> vcpu_scan_ioapic(vcpu);
> + if (kvm_check_request(KVM_REQ_STOP_VCPU, vcpu)){
> + mutex_lock(&vcpu->kvm->lock);
> + mutex_unlock(&vcpu->kvm->lock);
We should execute a serializing instruction here?
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -222,6 +222,18 @@ void kvm_make_scan_ioapic_request(struct kvm *kvm)
> make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
> }
>
> +int kvm_exec_with_stopped_vcpu(struct kvm *kvm, int (*cb)(void *), void
> *data)
> +{
> + int r;
> +
> + mutex_lock(&kvm->lock);
> + make_all_cpus_request(kvm, KVM_REQ_STOP_VCPU);
> + r = cb(data);
And here?
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