commit d54bd7f80a5cf7dc5242f745d4c9542c822a81f3
author Peter Xu <peterx@redhat.com> Thu Jul 14 13:56:16 2016 +0800
committer Michael S. Tsirkin <mst@redhat.com> Wed Jul 20 19:30:27 2016 +0300
tree 898bc1e3f20aef72e5342adbf9906e8d2223d657
parent b79104722fc77974a222929f5590c3bea2941dd7

intel_iommu: set IR bit for ECAP register

Enable IR in IOMMU Extended Capability register.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/i386/intel_iommu.c

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 26e322a..9c7a084 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1956,6 +1956,8 @@
  */
 static void vtd_init(IntelIOMMUState *s)
 {
+    X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s);
+
     memset(s->csr, 0, DMAR_REG_SIZE);
     memset(s->wmask, 0, DMAR_REG_SIZE);
     memset(s->w1cmask, 0, DMAR_REG_SIZE);
@@ -1977,6 +1979,10 @@
              VTD_CAP_SAGAW | VTD_CAP_MAMV | VTD_CAP_PSI | VTD_CAP_SLLPS;
     s->ecap = VTD_ECAP_QI | VTD_ECAP_IRO;
 
+    if (x86_iommu->intr_supported) {
+        s->ecap |= VTD_ECAP_IR;
+    }
+
     vtd_reset_context_cache(s);
     vtd_reset_iotlb(s);
 

hw/i386/intel_iommu_internal.h

diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index b648e69..5b98a11 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -176,6 +176,8 @@
 /* (offset >> 4) << 8 */
 #define VTD_ECAP_IRO                (DMAR_IOTLB_REG_OFFSET << 4)
 #define VTD_ECAP_QI                 (1ULL << 1)
+/* Interrupt Remapping support */
+#define VTD_ECAP_IR                 (1ULL << 3)
 
 /* CAP_REG */
 /* (offset >> 4) << 24 */