[PATCH v3 22/62] iommu/amd: KVM: SVM: Pass NULL @vcpu_info to indicate "not guest mode"

Sean Christopherson
2025-06-11T22:47:34Z

Pass NULL to amd_ir_set_vcpu_affinity() to communicate "don't post to a
vCPU" now that there's no need to communicate information back to KVM
about the previous vCPU (KVM does its own tracking).

Tested-by: Sairaj Kodilkar <sarunkod@amd.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/svm/avic.c | 16 ++++------------
drivers/iommu/amd/iommu.c | 10 +++++++---
2 files changed, 11 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 461300bc5608..6260bf3697ba 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -927,18 +927,10 @@ int avic_pi_update_irte(struct kvm_kernel_irqfd *irqfd, struct kvm *kvm,
}
}

- ret = 0;
- if (enable_remapped_mode) {
- /* Use legacy mode in IRTE */
- struct amd_iommu_pi_data pi;
-
- /**
- * Here, pi is used to:
- * - Tell IOMMU to use legacy mode for this interrupt.
- */
- pi.is_guest_mode = false;
- ret = irq_set_vcpu_affinity(host_irq, &pi);
- }
+ if (enable_remapped_mode)
+ ret = irq_set_vcpu_affinity(host_irq, NULL);
+ else
+ ret = 0;
out:
srcu_read_unlock(&kvm->irq_srcu, idx);
return ret;
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 512167f7aef4..5141507587e1 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3864,7 +3864,6 @@ static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
{
int ret;
struct amd_iommu_pi_data *pi_data = vcpu_info;
- struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data;
struct amd_ir_data *ir_data = data->chip_data;
struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
struct iommu_dev_data *dev_data;
@@ -3885,9 +3884,14 @@ static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
return -EINVAL;

ir_data->cfg = irqd_cfg(data);
- pi_data->ir_data = ir_data;

- if (pi_data->is_guest_mode) {
+ if (pi_data) {
+ struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data;
+
+ pi_data->ir_data = ir_data;
+
+ WARN_ON_ONCE(!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;
--
2.50.0.rc1.591.g9c95f17f64-goog