[xen staging] AMD/IOMMU: also insert IVMD ranges into Dom0's page tables

[patchbot@xxxxxxx]

commit a0fe9a1e8c1f28ac528625bd3be99e14a74253ee
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Sep 22 16:15:29 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 22 16:15:29 2021 +0200

    AMD/IOMMU: also insert IVMD ranges into Dom0's page tables
    
    So far only one region would be taken care of, if it can be placed in
    the exclusion range registers of the IOMMU. Take care of further ranges
    as well. Seeing that we've been doing fine without this, make both
    insertion and removal best effort only.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Paul Durrant <paul@xxxxxxx>
---
 xen/drivers/passthrough/amd/pci_amd_iommu.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/xen/drivers/passthrough/amd/pci_amd_iommu.c 
b/xen/drivers/passthrough/amd/pci_amd_iommu.c
index 819b5a6cc3..d2678b365a 100644
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -513,6 +513,14 @@ static int amd_iommu_add_device(u8 devfn, struct pci_dev 
*pdev)
         amd_iommu_flush_device(iommu, bdf);
     }
 
+    if ( amd_iommu_reserve_domain_unity_map(
+             pdev->domain,
+             ivrs_mappings[ivrs_mappings[bdf].dte_requestor_id].unity_map,
+             0) )
+        AMD_IOMMU_DEBUG("%pd: unity mapping failed for %04x:%02x:%02x.%u\n",
+                        pdev->domain, pdev->seg, pdev->bus, PCI_SLOT(devfn),
+                        PCI_FUNC(devfn));
+
     return amd_iommu_setup_domain_device(pdev->domain, iommu, devfn, pdev);
 }
 
@@ -538,6 +546,14 @@ static int amd_iommu_remove_device(u8 devfn, struct 
pci_dev *pdev)
 
     ivrs_mappings = get_ivrs_mappings(pdev->seg);
     bdf = PCI_BDF2(pdev->bus, devfn);
+
+    if ( amd_iommu_reserve_domain_unity_unmap(
+             pdev->domain,
+             ivrs_mappings[ivrs_mappings[bdf].dte_requestor_id].unity_map) )
+        AMD_IOMMU_DEBUG("%pd: unity unmapping failed for %04x:%02x:%02x.%u\n",
+                        pdev->domain, pdev->seg, pdev->bus, PCI_SLOT(devfn),
+                        PCI_FUNC(devfn));
+
     if ( amd_iommu_perdev_intremap &&
          ivrs_mappings[bdf].dte_requestor_id == bdf &&
          ivrs_mappings[bdf].intremap_table )
--
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