[PATCH 3/5] vtd: Print originating iommu on faults

Teddy Astie <[email protected]> Wed, 29 Jul 2026 11:59:45 +0200
Newsgroups gmane.comp.emulators.xen.devel
Message-ID <1785319342.8631fc262581453bbf619ec5b2062170.19fad533fa5000e099@vates.tech>
When a fault occurs on a IOMMU, print the IOMMU the fault is coming from.

Signed-off-by: Teddy Astie <[email protected]>
---
 xen/drivers/passthrough/vtd/iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index 1005e200c1..5e9232d4b1 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -992,8 +992,8 @@ static int iommu_page_fault_do_one(struct vtd_iommu *iommu, int type,
         break;
     }
 
-    printk(XENLOG_G_WARNING VTDPREFIX "%s: reason %02x - %s\n",
-           kind, fault_reason, reason);
+    printk(XENLOG_G_WARNING VTDPREFIX "%s: reason %02x - %s on iommu:%u\n",
+           kind, fault_reason, reason, iommu->index);
 
     if ( iommu_verbose && fault_type == DMA_REMAP )
         print_vtd_entries(iommu, PCI_BUS(source_id), PCI_DEVFN(source_id),
-- 
2.54.0



-- 
Teddy Astie | Vates XCP-ng Developer

XCP-ng & Xen Orchestra - Vates solutions

web: https://vates.tech