[Xen-changelog] [xen stable-4.12] VT-d: posted interrupts require interrupt remapping

[patchbot@xxxxxxx]

commit fa9d5b8beb3ff3aa0c1f0712173e2ec3bd700279
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed May 15 09:41:37 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed May 15 09:41:37 2019 +0200

    VT-d: posted interrupts require interrupt remapping
    
    Initially I had just noticed the unnecessary indirection in the call
    from pi_update_irte(). The generic wrapper having an iommu_intremap
    conditional made me look at the setup code though. So first of all
    enforce the necessary dependency.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 6c54663786d9f1ed04153867687c158675e7277d
    master date: 2019-04-09 15:12:07 +0200
---
 xen/drivers/passthrough/vtd/intremap.c | 3 ++-
 xen/drivers/passthrough/vtd/iommu.c    | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/intremap.c 
b/xen/drivers/passthrough/vtd/intremap.c
index 1d19856091..c9927e4706 100644
--- a/xen/drivers/passthrough/vtd/intremap.c
+++ b/xen/drivers/passthrough/vtd/intremap.c
@@ -988,7 +988,8 @@ int pi_update_irte(const struct pi_desc *pi_desc, const 
struct pirq *pirq,
     spin_unlock_irq(&desc->lock);
 
     ASSERT(pcidevs_locked());
-    return iommu_update_ire_from_msi(msi_desc, &msi_desc->msg);
+
+    return msi_msg_write_remap_rte(msi_desc, &msi_desc->msg);
 
  unlock_out:
     spin_unlock_irq(&desc->lock);
diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index 50a0e25224..1db1cd9f2d 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -2342,7 +2342,7 @@ int __init intel_vtd_setup(void)
          * not supported, since we count on this feature to
          * atomically update 16-byte IRTE in posted format.
          */
-        if ( !cap_intr_post(iommu->cap) || !cpu_has_cx16 )
+        if ( !cap_intr_post(iommu->cap) || !iommu_intremap || !cpu_has_cx16 )
             iommu_intpost = 0;
 
         if ( !vtd_ept_page_compatible(iommu) )
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.12

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