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authorRobin Murphy <robin.murphy@arm.com>2017-08-10 13:11:49 -0600
committerAlex Williamson <alex.williamson@redhat.com>2017-08-10 13:11:49 -0600
commitdb406cc0ac2d5d8314dfceab8dce3bb4daac9268 (patch)
tree8c70aa62bc16d88226fa42978b60590fe27f66fc /drivers/vfio
parentaae4e7a8bc44722fe70d58920a36916b1043195e (diff)
downloadlinux-db406cc0ac2d5d8314dfceab8dce3bb4daac9268.tar.bz2
vfio/type1: Cope with hardware MSI reserved regions
For ARM-based systems with a GICv3 ITS to provide interrupt isolation, but hardware limitations which are worked around by having MSIs bypass SMMU translation (e.g. HiSilicon Hip06/Hip07), VFIO neglects to check for the IRQ_DOMAIN_FLAG_MSI_REMAP capability, (and thus erroneously demands unsafe_interrupts) if a software-managed MSI region is absent. Fix this by always checking for isolation capability at both the IRQ domain and IOMMU domain levels, rather than predicating that on whether MSIs require an IOMMU mapping (which was always slightly tenuous logic). Signed-off-by: Robin Murphy <robin.murphy@arm.com> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio_iommu_type1.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 8549cb111627..2328be628f21 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1265,8 +1265,8 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
INIT_LIST_HEAD(&domain->group_list);
list_add(&group->next, &domain->group_list);
- msi_remap = resv_msi ? irq_domain_check_msi_remap() :
- iommu_capable(bus, IOMMU_CAP_INTR_REMAP);
+ msi_remap = irq_domain_check_msi_remap() ||
+ iommu_capable(bus, IOMMU_CAP_INTR_REMAP);
if (!allow_unsafe_interrupts && !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",