[xen staging] AMD/IOMMU: consider hidden devices when flushing device I/O TLBs

[patchbot@xxxxxxx]

commit 036432e8b27e1ef21e0f0204ba9b0e3972a031c2
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Oct 12 11:54:34 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 12 11:54:34 2021 +0200

    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@xxxxxxxx>
    Reviewed-by: Paul Durrant <paul@xxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_cmd.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_cmd.c 
b/xen/drivers/passthrough/amd/iommu_cmd.c
index 4db8e1651f..a73830386b 100644
--- a/xen/drivers/passthrough/amd/iommu_cmd.c
+++ b/xen/drivers/passthrough/amd/iommu_cmd.c
@@ -308,14 +308,11 @@ void amd_iommu_flush_iotlb(u8 devfn, const struct pci_dev 
*pdev,
     flush_command_buffer(iommu, iommu_dev_iotlb_timeout);
 }
 
-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;
@@ -343,7 +340,16 @@ static void _amd_iommu_flush_pages(struct domain *d,
     }
 
     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)
--
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