x86/amd-iommu: Make sure a device is assigned in passthrough mode

When the IOMMU driver runs in passthrough mode it has to
make sure that every device not assigned to an IOMMU-API
domain must be put into the passthrough domain instead of
keeping it unassigned.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 9aa135d4453f1ef004c224509189a3e6a7c44e7a..a8e74c34dd27c917fb1b5f2fdc3b2ed1896c91f7 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1141,6 +1141,15 @@ static void __detach_device(struct protection_domain *domain, u16 devid)
 
        /* ready */
        spin_unlock(&domain->lock);
+
+       /*
+        * If we run in passthrough mode the device must be assigned to the
+        * passthrough domain if it is detached from any other domain
+        */
+       if (iommu_pass_through) {
+               struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
+               __attach_device(iommu, pt_domain, devid);
+       }
 }
 
 /*