[PATCH v5 06/18] kvm: x86: svm: Add support to (de)activate posted interrupts

Suravee Suthikulpanit
2019-11-14T20:16:47Z

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>
---
arch/x86/kvm/svm.c | 37 ++++++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 3395e4c..38401f9 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5134,17 +5134,52 @@ 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)
--
1.8.3.1