[PATCH 2 of 7 V4] amd iommu: Add a new flag to indication iommuv2 feature enabled or not

[Wei Wang <wei.wang2@amd.com>]

# HG changeset patch
# User Wei Wang <wei.wang2@amd.com>
# Date 1327066820 -3600
# Node ID ea3af8fa078c07d357de79931a102450b59156ea
# Parent  978e61814be49ec544151803be3e3b2717551316
amd iommu: Add a new flag to indication iommuv2 feature enabled or not.
Hypercalls should return early on non-iommuv2 systems.

Signed-off-by: Wei Wang <wei.wang2@amd.com>

diff -r 978e61814be4 -r ea3af8fa078c 
xen/drivers/passthrough/amd/iommu_guest.c
--- a/xen/drivers/passthrough/amd/iommu_guest.c	Fri Jan 20 14:40:11 2012 
+0100
+++ b/xen/drivers/passthrough/amd/iommu_guest.c	Fri Jan 20 14:40:20 2012 
+0100
@@ -825,6 +825,9 @@ int guest_iommu_set_base(struct domain *
      if ( !iommu )
          return -EACCES;

+    if ( !is_hvm_domain(d) || !iommuv2_enabled )
+        return 1;
+
      iommu->mmio_base = base;
      base >>= PAGE_SHIFT;

@@ -884,7 +887,7 @@ int guest_iommu_init(struct domain* d)
      struct guest_iommu *iommu;
      struct hvm_iommu *hd  = domain_hvm_iommu(d);

-    if ( !is_hvm_domain(d) )
+    if ( !is_hvm_domain(d) || !iommuv2_enabled )
          return 0;

      iommu = xzalloc(struct guest_iommu);
@@ -916,6 +919,9 @@ void guest_iommu_destroy(struct domain *
      iommu = domain_iommu(d);
      if ( !iommu )
          return;
+
+    if ( !iommuv2_enabled )
+        return;

      tasklet_kill(&iommu->cmd_buffer_tasklet);
      xfree(iommu);
@@ -944,7 +950,7 @@ int iommu_bind_bdf(struct domain* d, uin
      struct pci_dev *pdev;
      int ret = -ENODEV;

-    if ( !iommu_found() )
+    if ( !iommu_found() || !iommuv2_enabled )
          return 0;

      spin_lock(&pcidevs_lock);
@@ -970,7 +976,7 @@ void iommu_set_msi(struct domain* d, uin
  {
      struct guest_iommu *iommu = domain_iommu(d);

-    if ( !iommu_found() )
+    if ( !iommu_found() || !iommuv2_enabled )
          return;

      iommu->msi.vector = vector;
diff -r 978e61814be4 -r ea3af8fa078c 
xen/drivers/passthrough/amd/iommu_init.c
--- a/xen/drivers/passthrough/amd/iommu_init.c	Fri Jan 20 14:40:11 2012 
+0100
+++ b/xen/drivers/passthrough/amd/iommu_init.c	Fri Jan 20 14:40:20 2012 
+0100
@@ -38,6 +38,7 @@ unsigned short ivrs_bdf_entries;
  static struct radix_tree_root ivrs_maps;
  struct list_head amd_iommu_head;
  struct table_struct device_table;
+bool_t iommuv2_enabled;

  static int iommu_has_ht_flag(struct amd_iommu *iommu, u8 mask)
  {
@@ -799,6 +800,10 @@ static void enable_iommu(struct amd_iomm
          amd_iommu_flush_all_caches(iommu);

      iommu->enabled = 1;
+
+    if ( iommu->features )
+        iommuv2_enabled = 1;
+
      spin_unlock_irqrestore(&iommu->lock, flags);

  }
diff -r 978e61814be4 -r ea3af8fa078c xen/include/asm-x86/amd-iommu.h
--- a/xen/include/asm-x86/amd-iommu.h	Fri Jan 20 14:40:11 2012 +0100
+++ b/xen/include/asm-x86/amd-iommu.h	Fri Jan 20 14:40:20 2012 +0100
@@ -182,4 +182,6 @@ struct guest_iommu {
      struct guest_iommu_msi  msi;
  };

+extern bool_t iommuv2_enabled;
+
  #endif /* _ASM_X86_64_AMD_IOMMU_H */
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