[PATCH 26/67] iommu/amd: KVM: SVM: Delete now-unused cached/previous GA tag fields

[Sean Christopherson <seanjc@xxxxxxxxxx>]

Delete the amd_ir_data.prev_ga_tag field now that all usage is
superfluous.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
 arch/x86/kvm/svm/avic.c             |  2 --
 drivers/iommu/amd/amd_iommu_types.h |  1 -
 drivers/iommu/amd/iommu.c           | 10 ----------
 include/linux/amd-iommu.h           |  1 -
 4 files changed, 14 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 9024b9fbca53..7f0f6a9cd2e8 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -943,9 +943,7 @@ int avic_pi_update_irte(struct kvm_kernel_irqfd *irqfd, struct kvm *kvm,
 		/**
 		 * Here, pi is used to:
 		 * - Tell IOMMU to use legacy mode for this interrupt.
-		 * - Retrieve ga_tag of prior interrupt remapping data.
 		 */
-		pi.prev_ga_tag = 0;
 		pi.is_guest_mode = false;
 		ret = irq_set_vcpu_affinity(host_irq, &pi);
 	} else {
diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 23caea22f8dc..319a1b650b3b 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -1060,7 +1060,6 @@ struct irq_2_irte {
 };
 
 struct amd_ir_data {
-	u32 cached_ga_tag;
 	struct amd_iommu *iommu;
 	struct irq_2_irte irq_2_irte;
 	struct msi_msg msi_entry;
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 635774642b89..3c40bc9980b7 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3858,23 +3858,13 @@ static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
 	ir_data->cfg = irqd_cfg(data);
 	pi_data->ir_data = ir_data;
 
-	pi_data->prev_ga_tag = ir_data->cached_ga_tag;
 	if (pi_data->is_guest_mode) {
 		ir_data->ga_root_ptr = (vcpu_pi_info->pi_desc_addr >> 12);
 		ir_data->ga_vector = vcpu_pi_info->vector;
 		ir_data->ga_tag = pi_data->ga_tag;
 		ret = amd_iommu_activate_guest_mode(ir_data);
-		if (!ret)
-			ir_data->cached_ga_tag = pi_data->ga_tag;
 	} else {
 		ret = amd_iommu_deactivate_guest_mode(ir_data);
-
-		/*
-		 * This communicates the ga_tag back to the caller
-		 * so that it can do all the necessary clean up.
-		 */
-		if (!ret)
-			ir_data->cached_ga_tag = 0;
 	}
 
 	return ret;
diff --git a/include/linux/amd-iommu.h b/include/linux/amd-iommu.h
index 4f433ef39188..deeefc92a5cf 100644
--- a/include/linux/amd-iommu.h
+++ b/include/linux/amd-iommu.h
@@ -19,7 +19,6 @@ struct amd_iommu;
  */
 struct amd_iommu_pi_data {
 	u32 ga_tag;
-	u32 prev_ga_tag;
 	bool is_guest_mode;
 	struct vcpu_data *vcpu_data;
 	void *ir_data;
-- 
2.49.0.504.g3bcea36a83-goog