git: c6f76e9d5561 - stable/15 - amd_iommu: Honor disabled interrupt remapping

The branch stable/15 has been updated by kbowling:

URL: https://cgit.FreeBSD.org/src/commit/?id=c6f76e9d5561626fddc6656b4a0f5f70afc88458

commit c6f76e9d5561626fddc6656b4a0f5f70afc88458
Author:     Kevin Bowling <kbowling@FreeBSD.org>
AuthorDate: 2026-08-06 06:43:47 +0000
Commit:     Kevin Bowling <kbowling@FreeBSD.org>
CommitDate: 2026-08-22 00:26:38 +0000

    amd_iommu: Honor disabled interrupt remapping
    
    Do not instantiate an interrupt-remapping context for a unit whose IRTE
    support is disabled. In that mode the caller must retain the ordinary
    interrupt path.
    
    Reviewed by:    kib
    Differential Revision:  https://reviews.freebsd.org/D58725
    
    (cherry picked from commit 9f4df9fc1ba8841a28584ed1323fc8cc9e54c9bc)
---
 sys/x86/iommu/amd_intrmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/x86/iommu/amd_intrmap.c b/sys/x86/iommu/amd_intrmap.c
index cce4f57ca323..3e48281d1931 100644
--- a/sys/x86/iommu/amd_intrmap.c
+++ b/sys/x86/iommu/amd_intrmap.c
@@ -254,7 +254,7 @@ amdiommu_ir_find(device_t src, uint16_t *ridp, bool *is_iommu)
 	} else {
 		error = amdiommu_find_unit(src, &unit, &rid, &dte, &edte,
 		    bootverbose);
-		if (error == 0) {
+		if (error == 0 && unit->irte_enabled) {
 			ioctx = iommu_instantiate_ctx(AMD2IOMMU(unit), src, false);
 			if (ioctx != NULL)
 				ctx = IOCTX2CTX(ioctx);