On Thu, Jul 30, 2015 at 10:21:54AM +0200, Paolo Bonzini wrote:
> Please review this diff:
>
> diff --git b/arch/x86/kvm/irq.h a/arch/x86/kvm/irq.h
> index 72af5a989a2e..975cf33ef306 100644
> --- b/arch/x86/kvm/irq.h
> +++ a/arch/x86/kvm/irq.h
> @@ -93,11 +90,11 @@ static inline int irqchip_split(struct kvm *kvm)
> bool ret;
> struct kvm_pic *vpic = pic_irqchip(kvm);
>
> - /* Read vpic before kvm->irq_routing. */
> - smp_rmb();
> ret = (vpic != NULL);
> ret |= irqchip_split(kvm);
>
> + /* Read vpic before kvm->irq_routing. */
> + smp_rmb();
> return ret;
> }
>
> diff --git b/arch/x86/kvm/lapic.c a/arch/x86/kvm/lapic.c
> index 2f486d8ecdae..a86324ca9cc3 100644
> --- b/arch/x86/kvm/lapic.c
> +++ a/arch/x86/kvm/lapic.c
> @@ -209,7 +209,7 @@ out:
> if (old)
> kfree_rcu(old, rcu);
>
> - if (!irqchip_split(kvm))
> + if (ioapic_in_kernel(kvm))
> kvm_vcpu_request_scan_ioapic(kvm);
> }
>
> @@ -1846,7 +1846,7 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
> kvm_x86_ops->hwapic_isr_update(vcpu->kvm,
> apic_find_highest_isr(apic));
> kvm_make_request(KVM_REQ_EVENT, vcpu);
> - if (!ioapic_in_kernel(vcpu->kvm))
> + if (ioapic_in_kernel(vcpu->kvm))
> kvm_rtc_eoi_tracking_restore_one(vcpu);
> }
>
> diff --git b/arch/x86/kvm/x86.c a/arch/x86/kvm/x86.c
> index 49a98608e3f6..5d2b8695732c 100644
> --- b/arch/x86/kvm/x86.c
> +++ a/arch/x86/kvm/x86.c
> @@ -3573,16 +3573,14 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
> r = -EEXIST;
> if (irqchip_in_kernel(kvm))
> goto split_irqchip_unlock;
> - if (!irqchip_split(kvm)) {
> - if (atomic_read(&kvm->online_vcpus))
> - goto split_irqchip_unlock;
> - r = kvm_setup_empty_irq_routing(kvm);
> - if (r)
> - goto split_irqchip_unlock;
> - /* Pairs with irqchip_in_kernel. */
> - smp_wmb();
> - kvm->arch.irqchip_split = true;
> - }
> + if (atomic_read(&kvm->online_vcpus))
> + goto split_irqchip_unlock;
> + r = kvm_setup_empty_irq_routing(kvm);
> + if (r)
> + goto split_irqchip_unlock;
> + /* Pairs with irqchip_in_kernel. */
> + smp_wmb();
> + kvm->arch.irqchip_split = true;
This looks a bit non-sensical, but is overprepared for the introduction
IOAPIC hotplug, which two patches down the line. Changing it is fine,
you'll just need to merge the very same change back.
> r = 0;
> split_irqchip_unlock:
> mutex_unlock(&kvm->lock);
> @@ -3701,7 +3699,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
> }
>
> r = -ENXIO;
> - if (!irqchip_in_kernel(kvm) || !ioapic_in_kernel(kvm))
> + if (!irqchip_in_kernel(kvm) || irqchip_split(kvm))
> goto get_irqchip_out;
> r = kvm_vm_ioctl_get_irqchip(kvm, chip);
> if (r)
> @@ -3725,7 +3723,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
> }
>
> r = -ENXIO;
> - if (!irqchip_in_kernel(kvm) || !ioapic_in_kernel(kvm))
> + if (!irqchip_in_kernel(kvm) || irqchip_split(kvm))
> goto set_irqchip_out;
> r = kvm_vm_ioctl_set_irqchip(kvm, chip);
> if (r)
>
> No need to resend.
>
> Paolo
Looks good.
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