[RFC PATCH 01/20] intel_iommu: add "ecs" option

["Liu, Yi L" <yi.l.liu@xxxxxxxxxxxxxxx>]

Report ecap.ECS=1 to guest by "-deivce intel-iommu, ecs=on" in QEMU Cmd

Signed-off-by: Liu, Yi L <yi.l.liu@xxxxxxxxxxxxxxx>
---
 hw/i386/intel_iommu.c          | 5 +++++
 hw/i386/intel_iommu_internal.h | 1 +
 include/hw/i386/intel_iommu.h  | 1 +
 3 files changed, 7 insertions(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 4b7d90d..400d0d1 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2409,6 +2409,7 @@ static Property vtd_properties[] = {
                             ON_OFF_AUTO_AUTO),
     DEFINE_PROP_BOOL("x-buggy-eim", IntelIOMMUState, buggy_eim, false),
     DEFINE_PROP_BOOL("caching-mode", IntelIOMMUState, caching_mode, FALSE),
+    DEFINE_PROP_BOOL("ecs", IntelIOMMUState, ecs, FALSE),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -2925,6 +2926,10 @@ static void vtd_init(IntelIOMMUState *s)
         s->ecap |= VTD_ECAP_PT;
     }
 
+    if (s->ecs) {
+        s->ecap |= VTD_ECAP_ECS;
+    }
+
     if (s->caching_mode) {
         s->cap |= VTD_CAP_CM;
     }
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index b96884e..ec1bd17 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -190,6 +190,7 @@
 #define VTD_ECAP_EIM                (1ULL << 4)
 #define VTD_ECAP_PT                 (1ULL << 6)
 #define VTD_ECAP_MHMV               (15ULL << 20)
+#define VTD_ECAP_ECS                (1ULL << 24)
 
 /* CAP_REG */
 /* (offset >> 4) << 24 */
diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index 3e51876..fa5963e 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -266,6 +266,7 @@ struct IntelIOMMUState {
     uint32_t version;
 
     bool caching_mode;          /* RO - is cap CM enabled? */
+    bool ecs;                       /* Extended Context Support */
 
     dma_addr_t root;                /* Current root table pointer */
     bool root_extended;             /* Type of root table (extended or not) */
-- 
1.9.1