vfio/type1: Cope with hardware MSI reserved regions
authorRobin Murphy <robin.murphy@arm.com>
Thu, 10 Aug 2017 19:11:49 +0000 (13:11 -0600)
committerAlex Williamson <alex.williamson@redhat.com>
Thu, 10 Aug 2017 19:11:49 +0000 (13:11 -0600)
commitdb406cc0ac2d5d8314dfceab8dce3bb4daac9268
tree8c70aa62bc16d88226fa42978b60590fe27f66fc
parentaae4e7a8bc44722fe70d58920a36916b1043195e
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>
drivers/vfio/vfio_iommu_type1.c