From: Sairaj Kodilkar <sarunkod@amd.com>

The ats_enabled field is set using HTTUNEN, which is wrong.
Fix this by removing the field as it is never used.

MST: includes a tweak suggested by Philippe

Fixes: d29a09ca68428 ("hw/i386: Introduce AMD IOMMU")
Signed-off-by: Sairaj Kodilkar <sarunkod@amd.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Message-Id: <20250801060507.3382-3-sarunkod@amd.com>
Message-ID: <948a6ac3-ded9-475b-8c45-9d36220b442b@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/i386/amd_iommu.h | 1 -
 hw/i386/amd_iommu.c | 5 ++---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
index 8b42913ed8..67078c6f1e 100644
--- a/hw/i386/amd_iommu.h
+++ b/hw/i386/amd_iommu.h
@@ -322,7 +322,6 @@ struct AMDVIState {
     uint64_t mmio_addr;
 
     bool enabled;                /* IOMMU enabled                */
-    bool ats_enabled;            /* address translation enabled  */
     bool cmdbuf_enabled;         /* command buffer enabled       */
     bool evtlog_enabled;         /* event log enabled            */
     bool excl_enabled;
diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 7fb0bb68f0..037e78056d 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -646,7 +646,6 @@ static void amdvi_handle_control_write(AMDVIState *s)
     unsigned long control = amdvi_readq(s, AMDVI_MMIO_CONTROL);
     s->enabled = !!(control & AMDVI_MMIO_CONTROL_AMDVIEN);
 
-    s->ats_enabled = !!(control & AMDVI_MMIO_CONTROL_HTTUNEN);
     s->evtlog_enabled = s->enabled && !!(control &
                         AMDVI_MMIO_CONTROL_EVENTLOGEN);
 
@@ -1555,7 +1554,6 @@ static void amdvi_init(AMDVIState *s)
     s->excl_allow = false;
     s->mmio_enabled = false;
     s->enabled = false;
-    s->ats_enabled = false;
     s->cmdbuf_enabled = false;
 
     /* reset MMIO */
@@ -1626,7 +1624,8 @@ static const VMStateDescription vmstate_amdvi_sysbus_migratable = {
       /* Updated in  amdvi_handle_control_write() */
       VMSTATE_BOOL(enabled, AMDVIState),
       VMSTATE_BOOL(ga_enabled, AMDVIState),
-      VMSTATE_BOOL(ats_enabled, AMDVIState),
+      /* bool ats_enabled is obsolete */
+      VMSTATE_UNUSED(1), /* was ats_enabled */
       VMSTATE_BOOL(cmdbuf_enabled, AMDVIState),
       VMSTATE_BOOL(completion_wait_intr, AMDVIState),
       VMSTATE_BOOL(evtlog_enabled, AMDVIState),
-- 
MST