[Xen-devel] [v6][PATCH 7/7] xen/vtd: make USB RMRR mapping safe

[Tiejun Chen <tiejun.chen@xxxxxxxxx>]

We already reserve all RMRR mappings so USB should be safe with
RMRR.

Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>

diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index d513dba..ea5d343 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -2273,16 +2273,8 @@ static int intel_iommu_assign_device(
     if ( ret )
         goto done;
 
-    /* FIXME: Because USB RMRR conflicts with guest bios region,
-     * ignore USB RMRR temporarily.
-     */
     seg = pdev->seg;
     bus = pdev->bus;
-    if ( is_usb_device(seg, bus, pdev->devfn) )
-    {
-        ret = 0;
-        goto done;
-    }
 
     /* Setup rmrr identity mapping */
     for_each_rmrr_device( rmrr, bdf, i )
-- 
1.9.1


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