[PATCH rfcv1 05/23] intel_iommu: add a placeholder variable for scalable modern mode

[Zhenzhong Duan]

Add an new element scalable_mode in IntelIOMMUState to mark scalable
modern mode, this element will be exposed as an intel_iommu property
finally.

For now, it's only a placehholder and used for cap/ecap initialization,
parameter compatibility check, etc.

No need to zero this element separately as IntelIOMMUState is zeroed
when creation.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu_internal.h |  3 +++
 include/hw/i386/intel_iommu.h  |  1 +
 hw/i386/intel_iommu.c          | 13 +++++++++++--
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index f8cf99bddf..ee4a784a35 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -192,9 +192,11 @@
 #define VTD_ECAP_SC                 (1ULL << 7)
 #define VTD_ECAP_MHMV               (15ULL << 20)
 #define VTD_ECAP_SRS                (1ULL << 31)
+#define VTD_ECAP_EAFS               (1ULL << 34)
 #define VTD_ECAP_PASID              (1ULL << 40)
 #define VTD_ECAP_SMTS               (1ULL << 43)
 #define VTD_ECAP_SLTS               (1ULL << 46)
+#define VTD_ECAP_FLTS               (1ULL << 47)
 
 /* CAP_REG */
 /* (offset >> 4) << 24 */
@@ -211,6 +213,7 @@
 #define VTD_CAP_SLLPS               ((1ULL << 34) | (1ULL << 35))
 #define VTD_CAP_DRAIN_WRITE         (1ULL << 54)
 #define VTD_CAP_DRAIN_READ          (1ULL << 55)
+#define VTD_CAP_FL1GP               (1ULL << 56)
 #define VTD_CAP_DRAIN               (VTD_CAP_DRAIN_READ | VTD_CAP_DRAIN_WRITE)
 #define VTD_CAP_CM                  (1ULL << 7)
 #define VTD_PASID_ID_SHIFT          20
diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index b8abbcce12..006cec116b 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -270,6 +270,7 @@ struct IntelIOMMUState {
 
     bool caching_mode;              /* RO - is cap CM enabled? */
     bool scalable_mode;             /* RO - is Scalable Mode supported? */
+    bool scalable_modern;           /* RO - is modern SM supported? */
     bool snoop_control;             /* RO - is SNP filed supported? */
 
     dma_addr_t root;                /* Current root table pointer */
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index be03fcbf52..1d007c33a8 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -4095,8 +4095,11 @@ static void vtd_cap_init(IntelIOMMUState *s)
     }
 
     /* TODO: read cap/ecap from host to decide which cap to be exposed. */
-    if (s->scalable_mode) {
+    if (s->scalable_mode && !s->scalable_modern) {
         s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_SRS | VTD_ECAP_SLTS;
+    } else if (s->scalable_mode && s->scalable_modern) {
+        s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_SRS | VTD_ECAP_EAFS | 
VTD_ECAP_FLTS;
+        s->cap |= VTD_CAP_FL1GP;
     }
 
     if (s->snoop_control) {
@@ -4271,12 +4274,18 @@ static bool vtd_decide_config(IntelIOMMUState *s, Error 
**errp)
 
     /* Currently only address widths supported are 39 and 48 bits */
     if ((s->aw_bits != VTD_HOST_AW_39BIT) &&
-        (s->aw_bits != VTD_HOST_AW_48BIT)) {
+        (s->aw_bits != VTD_HOST_AW_48BIT) &&
+        !s->scalable_modern) {
         error_setg(errp, "Supported values for aw-bits are: %d, %d",
                    VTD_HOST_AW_39BIT, VTD_HOST_AW_48BIT);
         return false;
     }
 
+    if ((s->aw_bits != VTD_HOST_AW_48BIT) && s->scalable_modern) {
+        error_setg(errp, "Supported values for aw-bits are: %d",
+                   VTD_HOST_AW_48BIT);
+        return false;
+    }
     if (s->scalable_mode && !s->dma_drain) {
         error_setg(errp, "Need to set dma_drain for scalable mode");
         return false;
-- 
2.34.1