intel-iommu: Flush unmaps at domain_exit

We typically batch unmaps to be lazily flushed out at
regular intervals.  When we destroy a domain, we need
to force a flush of these lazy unmaps to be sure none
reference the domain we're about to free.

Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=35062
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 4e4e0202e59d..395f253c0494 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1422,6 +1422,10 @@ static void domain_exit(struct dmar_domain *domain)
         if (!domain)
                 return;
 
+        /* Flush any lazy unmaps that may reference this domain */
+        if (!intel_iommu_strict)
+                flush_unmaps_timeout(0);
+
         domain_remove_dev_info(domain);
         /* destroy iovas */
         put_iova_domain(&domain->iovad);