[PATCH v6 19/20] intel_iommu: Introduce a property to control FS1GP cap bit setting

[Zhenzhong Duan]

This gives user flexibility to turn off FS1GP for debug purpose.

It is also useful for future nesting feature. When host IOMMU doesn't
support FS1GP but vIOMMU does, nested page table on host side works
after turning FS1GP off in vIOMMU.

This property has no effect when vIOMMU is in legacy mode or x-flts=off
in scalable modme.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Clément Mathieu--Drif<clement.mathieu--drif@eviden.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
 include/hw/i386/intel_iommu.h | 1 +
 hw/i386/intel_iommu.c         | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index 72428fefa4..9e92bffd5a 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -307,6 +307,7 @@ struct IntelIOMMUState {
     bool dma_drain;                 /* Whether DMA r/w draining enabled */
     bool dma_translation;           /* Whether DMA translation supported */
     bool pasid;                     /* Whether to support PASID */
+    bool fs1gp;                     /* First Stage 1-GByte Page Support */
 
     /* Transient Mapping, Reserved(0) since VTD spec revision 3.2 */
     bool stale_tm;
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index e234b5c234..2247194341 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3834,6 +3834,7 @@ static Property vtd_properties[] = {
     DEFINE_PROP_BOOL("dma-drain", IntelIOMMUState, dma_drain, true),
     DEFINE_PROP_BOOL("dma-translation", IntelIOMMUState, dma_translation, 
true),
     DEFINE_PROP_BOOL("stale-tm", IntelIOMMUState, stale_tm, false),
+    DEFINE_PROP_BOOL("fs1gp", IntelIOMMUState, fs1gp, true),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -4562,7 +4563,9 @@ static void vtd_cap_init(IntelIOMMUState *s)
     /* TODO: read cap/ecap from host to decide which cap to be exposed. */
     if (s->flts) {
         s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_FLTS;
-        s->cap |= VTD_CAP_FS1GP;
+        if (s->fs1gp) {
+            s->cap |= VTD_CAP_FS1GP;
+        }
     } else if (s->scalable_mode) {
         s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_SRS | VTD_ECAP_SLTS;
     }
-- 
2.34.1