diff options
Diffstat (limited to 'xen/arch/x86/hvm/svm/intr.c')
| -rw-r--r-- | xen/arch/x86/hvm/svm/intr.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/xen/arch/x86/hvm/svm/intr.c b/xen/arch/x86/hvm/svm/intr.c index d2ba799a42..17a9c3bc7b 100644 --- a/xen/arch/x86/hvm/svm/intr.c +++ b/xen/arch/x86/hvm/svm/intr.c @@ -94,6 +94,46 @@ static void enable_intr_window(struct vcpu *v, struct hvm_intack intack) vmcb->general1_intercepts |= GENERAL1_INTERCEPT_VINTR; } +static void svm_dirq_assist(struct vcpu *v) +{ + unsigned int irq; + uint32_t device, intx; + struct domain *d = v->domain; + struct hvm_irq_dpci *hvm_irq_dpci = d->arch.hvm_domain.irq.dpci; + struct dev_intx_gsi_link *digl; + + if ( !amd_iommu_enabled || (v->vcpu_id != 0) || (hvm_irq_dpci == NULL) ) + return; + + for ( irq = find_first_bit(hvm_irq_dpci->dirq_mask, NR_IRQS); + irq < NR_IRQS; + irq = find_next_bit(hvm_irq_dpci->dirq_mask, NR_IRQS, irq + 1) ) + { + stop_timer(&hvm_irq_dpci->hvm_timer[irq_to_vector(irq)]); + clear_bit(irq, &hvm_irq_dpci->dirq_mask); + + list_for_each_entry ( digl, &hvm_irq_dpci->mirq[irq].digl_list, list ) + { + device = digl->device; + intx = digl->intx; + hvm_pci_intx_assert(d, device, intx); + spin_lock(&hvm_irq_dpci->dirq_lock); + hvm_irq_dpci->mirq[irq].pending++; + spin_unlock(&hvm_irq_dpci->dirq_lock); + } + + /* + * Set a timer to see if the guest can finish the interrupt or not. For + * example, the guest OS may unmask the PIC during boot, before the + * guest driver is loaded. hvm_pci_intx_assert() may succeed, but the + * guest will never deal with the irq, then the physical interrupt line + * will never be deasserted. + */ + set_timer(&hvm_irq_dpci->hvm_timer[irq_to_vector(irq)], + NOW() + PT_IRQ_TIME_OUT); + } +} + asmlinkage void svm_intr_assist(void) { struct vcpu *v = current; @@ -102,6 +142,7 @@ asmlinkage void svm_intr_assist(void) /* Crank the handle on interrupt state. */ pt_update_irq(v); + svm_dirq_assist(v); do { intack = hvm_vcpu_has_pending_irq(v); |