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[PATCH] xen/amd/iommu: Skip IO-APICs missing from the IVRS in shared IRT mode
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Stefano Stabellini <stefano.stabellini@xxxxxxx>
- Date: Tue, 20 Oct 2026 14:59:41 -0700
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- Delivery-date: Tue, 20 Oct 2026 22:00:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
When an IO-APIC with entries isn't described by the IVRS,
ioapic_id_to_index() returns MAX_IO_APICS. With per-device interrupt
remapping tables this is fatal, but in shared mode parse_ivrs_table()
only logs it and then uses MAX_IO_APICS as an index, reading and writing
one past the end of ioapic_sbdf[].
Skip such an IO-APIC instead. It is left without interrupt remapping,
which is what the rest of the code already assumes for an IO-APIC with
no index.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
---
xen/drivers/passthrough/amd/iommu_acpi.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c
b/xen/drivers/passthrough/amd/iommu_acpi.c
index 39ae637959..4688908824 100644
--- a/xen/drivers/passthrough/amd/iommu_acpi.c
+++ b/xen/drivers/passthrough/amd/iommu_acpi.c
@@ -1132,6 +1132,7 @@ static int __init cf_check parse_ivrs_table(struct
acpi_table_header *table)
IO_APIC_ID(apic));
if ( amd_iommu_perdev_intremap )
return -ENXIO;
+ continue;
}
/* SB IO-APIC is always on this device in AMD systems. */
--
2.43.0
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