[PATCH v5 16/17] vfio/type1: Check MSI remapping at irq domain level
From: eric.auger@redhat.com (Eric Auger)
Date: 2017-01-04 13:33:53
Also in:
kvm, linux-iommu, lkml
Subsystem:
the rest, vfio driver · Maintainers:
Linus Torvalds, Alex Williamson
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(-)
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;
--
1.9.1