[PATCH v2 08/13] accel/tcg: Move @iommu_notifiers from CPUState to TCG AccelCPUState

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

@iommu_notifiers is specific to TCG system emulation, move it to
AccelCPUState.

Restrict TCG specific code in system/physmem.c, adding an empty
stub for tcg_register_iommu_notifier().

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240428221450.26460-20-philmd@linaro.org>
---
 accel/tcg/vcpu-state.h |  3 +++
 include/hw/core/cpu.h  |  3 ---
 system/physmem.c       | 37 ++++++++++++++++++++++++++++---------
 3 files changed, 31 insertions(+), 12 deletions(-)

diff --git a/accel/tcg/vcpu-state.h b/accel/tcg/vcpu-state.h
index 5b09279140..51e54ca535 100644
--- a/accel/tcg/vcpu-state.h
+++ b/accel/tcg/vcpu-state.h
@@ -19,6 +19,9 @@ struct AccelCPUState {
 
 #ifdef CONFIG_USER_ONLY
     TaskState *ts;
+#else
+    /* track IOMMUs whose translations we've cached in the TCG TLB */
+    GArray *iommu_notifiers;
 #endif /* !CONFIG_USER_ONLY */
 
 #ifdef CONFIG_PLUGIN
diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index 97a0baf874..f3cbb944eb 100644
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -539,9 +539,6 @@ struct CPUState {
     /* Used for user-only emulation of prctl(PR_SET_UNALIGN). */
     bool prctl_unalign_sigbus;
 
-    /* track IOMMUs whose translations we've cached in the TCG TLB */
-    GArray *iommu_notifiers;
-
     /*
      * MUST BE LAST in order to minimize the displacement to CPUArchState.
      */
diff --git a/system/physmem.c b/system/physmem.c
index 44e477a1a5..1e003e42bb 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -27,6 +27,8 @@
 #include "qemu/madvise.h"
 
 #ifdef CONFIG_TCG
+#include "exec/translate-all.h"
+#include "accel/tcg/vcpu-state.h"
 #include "hw/core/tcg-cpu-ops.h"
 #endif /* CONFIG_TCG */
 
@@ -578,6 +580,8 @@ MemoryRegion *flatview_translate(FlatView *fv, hwaddr addr, hwaddr *xlat,
     return mr;
 }
 
+#ifdef CONFIG_TCG
+
 typedef struct TCGIOMMUNotifier {
     IOMMUNotifier n;
     MemoryRegion *mr;
@@ -614,17 +618,20 @@ static void tcg_register_iommu_notifier(CPUState *cpu,
     TCGIOMMUNotifier *notifier = NULL;
     int i;
 
-    for (i = 0; i < cpu->iommu_notifiers->len; i++) {
-        notifier = g_array_index(cpu->iommu_notifiers, TCGIOMMUNotifier *, i);
+    for (i = 0; i < cpu->accel->iommu_notifiers->len; i++) {
+        notifier = g_array_index(cpu->accel->iommu_notifiers,
+                                 TCGIOMMUNotifier *, i);
         if (notifier->mr == mr && notifier->iommu_idx == iommu_idx) {
             break;
         }
     }
-    if (i == cpu->iommu_notifiers->len) {
+    if (i == cpu->accel->iommu_notifiers->len) {
         /* Not found, add a new entry at the end of the array */
-        cpu->iommu_notifiers = g_array_set_size(cpu->iommu_notifiers, i + 1);
+        cpu->accel->iommu_notifiers = g_array_set_size(cpu->accel->iommu_notifiers,
+                                                       i + 1);
         notifier = g_new0(TCGIOMMUNotifier, 1);
-        g_array_index(cpu->iommu_notifiers, TCGIOMMUNotifier *, i) = notifier;
+        g_array_index(cpu->accel->iommu_notifiers,
+                      TCGIOMMUNotifier *, i) = notifier;
 
         notifier->mr = mr;
         notifier->iommu_idx = iommu_idx;
@@ -656,19 +663,31 @@ void tcg_iommu_free_notifier_list(CPUState *cpu)
     int i;
     TCGIOMMUNotifier *notifier;
 
-    for (i = 0; i < cpu->iommu_notifiers->len; i++) {
-        notifier = g_array_index(cpu->iommu_notifiers, TCGIOMMUNotifier *, i);
+    for (i = 0; i < cpu->accel->iommu_notifiers->len; i++) {
+        notifier = g_array_index(cpu->accel->iommu_notifiers,
+                                 TCGIOMMUNotifier *, i);
         memory_region_unregister_iommu_notifier(notifier->mr, &notifier->n);
         g_free(notifier);
     }
-    g_array_free(cpu->iommu_notifiers, true);
+    g_array_free(cpu->accel->iommu_notifiers, true);
 }
 
 void tcg_iommu_init_notifier_list(CPUState *cpu)
 {
-    cpu->iommu_notifiers = g_array_new(false, true, sizeof(TCGIOMMUNotifier *));
+    cpu->accel->iommu_notifiers = g_array_new(false, true,
+                                              sizeof(TCGIOMMUNotifier *));
 }
 
+#else
+
+static void tcg_register_iommu_notifier(CPUState *cpu,
+                                        IOMMUMemoryRegion *iommu_mr,
+                                        int iommu_idx)
+{
+}
+
+#endif
+
 /* Called from RCU critical section */
 MemoryRegionSection *
 address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr orig_addr,
-- 
2.41.0