diff mbox series

[06/67] iommu/amd: WARN if KVM attempts to set vCPU affinity without posted intrrupts

Message ID 20250404193923.1413163-7-seanjc@google.com (mailing list archive)
State New
Headers show
Series KVM: iommu: Overhaul device posted IRQs support | expand

Commit Message

Sean Christopherson April 4, 2025, 7:38 p.m. UTC 
WARN if KVM attempts to set vCPU affinity when posted interrupts aren't
enabled, as KVM shouldn't try to enable posting when they're unsupported,
and the IOMMU driver darn well should only advertise posting support when
AMD_IOMMU_GUEST_IR_VAPIC() is true.

Note, KVM consumes is_guest_mode only on success.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 drivers/iommu/amd/iommu.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index b3a01b7757ee..4f69a37cf143 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3852,19 +3852,12 @@  static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
 	if (!dev_data || !dev_data->use_vapic)
 		return -EINVAL;
 
+	if (WARN_ON_ONCE(!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)))
+		return -EINVAL;
+
 	ir_data->cfg = irqd_cfg(data);
 	pi_data->ir_data = ir_data;
 
-	/* Note:
-	 * SVM tries to set up for VAPIC mode, but we are in
-	 * legacy mode. So, we force legacy mode instead.
-	 */
-	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
-		pr_debug("%s: Fall back to using intr legacy remap\n",
-			 __func__);
-		pi_data->is_guest_mode = false;
-	}
-
 	pi_data->prev_ga_tag = ir_data->cached_ga_tag;
 	if (pi_data->is_guest_mode) {
 		ir_data->ga_root_ptr = (pi_data->base >> 12);