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[v5,16/17] vfio/type1: Check MSI remapping at irq domain level

Message ID 1483536746-2725-17-git-send-email-eric.auger@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Eric Auger Jan. 4, 2017, 1:32 p.m. UTC 
In case the IOMMU does not bypass MSI transactions (typical
case on ARM), we check all MSI controllers are IRQ remapping
capable. If not the IRQ assignment may be unsafe.

At this stage the arm-smmu-(v3) still advertise the
IOMMU_CAP_INTR_REMAP capability at IOMMU level. This will be
removed in subsequent patches.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 drivers/vfio/vfio_iommu_type1.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index b473ef80..efcf7c3 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -40,6 +40,7 @@ 
 #include <linux/mdev.h>
 #include <linux/notifier.h>
 #include <linux/dma-iommu.h>
+#include <linux/irqdomain.h>
 
 #define DRIVER_VERSION  "0.2"
 #define DRIVER_AUTHOR   "Alex Williamson <alex.williamson@redhat.com>"
@@ -1285,7 +1286,8 @@  static int vfio_iommu_type1_attach_group(void *iommu_data,
 	list_add(&group->next, &domain->group_list);
 
 	if (!allow_unsafe_interrupts &&
-	    !iommu_capable(bus, IOMMU_CAP_INTR_REMAP)) {
+	    !iommu_capable(bus, IOMMU_CAP_INTR_REMAP) &&
+	    (resv_msi && !irq_domain_check_msi_remap())) {
 		pr_warn("%s: No interrupt remapping support.  Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
 		       __func__);
 		ret = -EPERM;