File 61655b5a-AMD-IOMMU-hidden-devices-flush.patch of Package xen.22516

# Commit 036432e8b27e1ef21e0f0204ba9b0e3972a031c2
# Date 2021-10-12 11:54:34 +0200
# Author Jan Beulich <jbeulich@suse.com>
# Committer Jan Beulich <jbeulich@suse.com>
AMD/IOMMU: consider hidden devices when flushing device I/O TLBs

Hidden devices are associated with DomXEN but usable by the
hardware domain. Hence they need flushing as well when all devices are
to have flushes invoked.

While there drop a redundant ATS-enabled check and constify the first
parameter of the involved function.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Paul Durrant <paul@xen.org>

--- a/xen/drivers/passthrough/amd/iommu_cmd.c
+++ b/xen/drivers/passthrough/amd/iommu_cmd.c
@@ -313,14 +313,11 @@ void amd_iommu_flush_iotlb(u8 devfn, con
     spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
-static void amd_iommu_flush_all_iotlbs(struct domain *d, daddr_t daddr,
+static void amd_iommu_flush_all_iotlbs(const struct domain *d, daddr_t daddr,
                                        unsigned int order)
 {
     struct pci_dev *pdev;
 
-    if ( !ats_enabled )
-        return;
-
     for_each_pdev( d, pdev )
     {
         u8 devfn = pdev->devfn;
@@ -351,7 +348,16 @@ static void _amd_iommu_flush_pages(struc
     }
 
     if ( ats_enabled )
+    {
         amd_iommu_flush_all_iotlbs(d, daddr, order);
+
+        /*
+         * Hidden devices are associated with DomXEN but usable by the
+         * hardware domain. Hence they need dealing with here as well.
+         */
+        if ( is_hardware_domain(d) )
+            amd_iommu_flush_all_iotlbs(dom_xen, daddr, order);
+    }
 }
 
 void amd_iommu_flush_all_pages(struct domain *d)