iommu/vt-d: Warn on out-of-range invalidation address

For guest requested IOTLB invalidation, address and mask are provided as
part of the invalidation data. VT-d HW silently ignores any address bits
below the mask. SW shall also allow such case but give warning if
address does not align with the mask. This patch relax the fault
handling from error to warning and proceed with invalidation request
with the given mask.

Fixes: 6ee1b77ba3ac0 ("iommu/vt-d: Add svm/sva invalidate function")
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20200724014925.15523-7-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 34a0ebf..0a48315 100644 (file)
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5447,13 +5447,12 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
 
                switch (BIT(cache_type)) {
                case IOMMU_CACHE_INV_TYPE_IOTLB:
+                       /* HW will ignore LSB bits based on address mask */
                        if (inv_info->granularity == IOMMU_INV_GRANU_ADDR &&
                            size &&
                            (inv_info->addr_info.addr & ((BIT(VTD_PAGE_SHIFT + size)) - 1))) {
-                               pr_err_ratelimited("Address out of range, 0x%llx, size order %llu\n",
+                               pr_err_ratelimited("User address not aligned, 0x%llx, size order %llu\n",
                                                   inv_info->addr_info.addr, size);
-                               ret = -ERANGE;
-                               goto out_unlock;
                        }
 
                        /*