kvm: x86: svm: Add support to (de)activate posted interrupts

Introduce interface for (de)activate posted interrupts, and
implement SVM hooks to toggle AMD IOMMU guest virtual APIC mode.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b0c343f..e6118d1 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5155,17 +5155,52 @@ static void svm_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr)
 {
 }
 
+static int svm_set_pi_irte_mode(struct kvm_vcpu *vcpu, bool activate)
+{
+       int ret = 0;
+       unsigned long flags;
+       struct amd_svm_iommu_ir *ir;
+       struct vcpu_svm *svm = to_svm(vcpu);
+
+       if (!kvm_arch_has_assigned_device(vcpu->kvm))
+               return 0;
+
+       /*
+        * Here, we go through the per-vcpu ir_list to update all existing
+        * interrupt remapping table entry targeting this vcpu.
+        */
+       spin_lock_irqsave(&svm->ir_list_lock, flags);
+
+       if (list_empty(&svm->ir_list))
+               goto out;
+
+       list_for_each_entry(ir, &svm->ir_list, node) {
+               if (activate)
+                       ret = amd_iommu_activate_guest_mode(ir->data);
+               else
+                       ret = amd_iommu_deactivate_guest_mode(ir->data);
+               if (ret)
+                       break;
+       }
+out:
+       spin_unlock_irqrestore(&svm->ir_list_lock, flags);
+       return ret;
+}
+
 /* Note: Currently only used by Hyper-V. */
 static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
 {
        struct vcpu_svm *svm = to_svm(vcpu);
        struct vmcb *vmcb = svm->vmcb;
+       bool activated = kvm_vcpu_apicv_active(vcpu);
 
-       if (kvm_vcpu_apicv_active(vcpu))
+       if (activated)
                vmcb->control.int_ctl |= AVIC_ENABLE_MASK;
        else
                vmcb->control.int_ctl &= ~AVIC_ENABLE_MASK;
        mark_dirty(vmcb, VMCB_AVIC);
+
+       svm_set_pi_irte_mode(vcpu, activated);
 }
 
 static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)