intel-iommu: Disallow interrupt remapping if not all ioapics covered
Current kernel enable interrupt remapping only when all the vt-d unit support
interrupt remapping. So it is reasonable we should also disallow enabling
intr-remapping if there any io-apics that are not listed under vt-d units.
Otherwise we can run into issues.
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Youquan Song <youquan.song@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 3264b62..fba4f68 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -570,9 +570,6 @@
printk(KERN_INFO PREFIX "No ATSR found\n");
#endif
-#ifdef CONFIG_INTR_REMAP
- parse_ioapics_under_ir();
-#endif
return 0;
}
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 4f5b871..ebfa47b 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -626,6 +626,11 @@
struct dmar_drhd_unit *drhd;
int setup = 0;
+ if (parse_ioapics_under_ir() != 1) {
+ printk(KERN_INFO "Not enable interrupt remapping\n");
+ return -1;
+ }
+
for_each_drhd_unit(drhd) {
struct intel_iommu *iommu = drhd->iommu;
