File xsa400-02.patch of Package xen.27500

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File xsa400-02.patch of Package xen.27500

VT-d: fix add/remove ordering when RMRRs are in use

In the event that the RMRR mappings are essential for device operation,
they should be established before updating the device's context entry,
while they should be torn down only after the device's context entry was
successfully cleared.

Fixes: fa88cfadf918 ("vt-d: Map RMRR in intel_iommu_add_device() if the device has RMRR")
Fixes: 8b99f4400b69 ("VT-d: fix RMRR related error handling")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>

--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1863,14 +1863,6 @@ static int intel_iommu_add_device(u8 dev
     if ( !pdev->domain )
         return -EINVAL;
 
-    ret = domain_context_mapping(pdev->domain, devfn, pdev);
-    if ( ret )
-    {
-        dprintk(XENLOG_ERR VTDPREFIX, "d%d: context mapping failed\n",
-                pdev->domain->domain_id);
-        return ret;
-    }
-
     for_each_rmrr_device ( rmrr, bdf, i )
     {
         if ( rmrr->segment == pdev->seg &&
@@ -1892,7 +1884,12 @@ static int intel_iommu_add_device(u8 dev
         }
     }
 
-    return 0;
+    ret = domain_context_mapping(pdev->domain, devfn, pdev);
+    if ( ret )
+        dprintk(XENLOG_ERR VTDPREFIX, "d%d: context mapping failed\n",
+                pdev->domain->domain_id);
+
+    return ret;
 }
 
 static int intel_iommu_enable_device(struct pci_dev *pdev)
@@ -1914,11 +1911,15 @@ static int intel_iommu_remove_device(u8
 {
     struct acpi_rmrr_unit *rmrr;
     u16 bdf;
-    int i;
+    int ret, i;
 
     if ( !pdev->domain )
         return -EINVAL;
 
+    ret = domain_context_unmap(pdev->domain, devfn, pdev);
+    if ( ret )
+        return ret;
+
     for_each_rmrr_device ( rmrr, bdf, i )
     {
         if ( rmrr->segment != pdev->seg ||
@@ -1934,7 +1935,7 @@ static int intel_iommu_remove_device(u8
                                rmrr->end_address, 0);
     }
 
-    return domain_context_unmap(pdev->domain, devfn, pdev);
+    return 0;
 }
 
 static int __hwdom_init setup_hwdom_device(u8 devfn, struct pci_dev *pdev)

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File xsa400-02.patch of Package xen.27500

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