[PATCH v3 08/10] hw/tpm: crb: Implement tpm_ppi_uninit and use it in tpm_crb_unrealize

[Stefan Berger <stefanb@linux.ibm.com>]

Implement tpm_ppi_uninit and use it for proper teardown of the PPI in
tpm_crb_unrealize.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 hw/tpm/tpm_crb.c |  3 +++
 hw/tpm/tpm_ppi.c | 10 ++++++++++
 hw/tpm/tpm_ppi.h | 10 ++++++++++
 3 files changed, 23 insertions(+)

diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c
index cd46b2e888..5c50a79936 100644
--- a/hw/tpm/tpm_crb.c
+++ b/hw/tpm/tpm_crb.c
@@ -16,6 +16,7 @@
 
 #include "qemu/osdep.h"
 
+#include "qemu/memalign.h"
 #include "qemu/module.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
@@ -527,6 +528,8 @@ static void tpm_crb_unrealize(DeviceState *dev)
     if (s->migration_blocker) {
         migrate_del_blocker(&s->migration_blocker);
     }
+
+    tpm_ppi_uninit(&s->ppi, get_system_memory(), OBJECT(s));
 }
 
 static void tpm_crb_class_init(ObjectClass *klass, const void *data)
diff --git a/hw/tpm/tpm_ppi.c b/hw/tpm/tpm_ppi.c
index f0c34291dc..35baa083f2 100644
--- a/hw/tpm/tpm_ppi.c
+++ b/hw/tpm/tpm_ppi.c
@@ -57,3 +57,13 @@ void tpm_ppi_init(TPMPPI *tpmppi, MemoryRegion *m,
 
     memory_region_add_subregion(m, addr, &tpmppi->ram);
 }
+
+void tpm_ppi_uninit(TPMPPI *tpmppi, MemoryRegion *m, Object *obj)
+{
+    memory_region_del_subregion(m, &tpmppi->ram);
+
+    vmstate_unregister_ram(&tpmppi->ram, DEVICE(obj));
+
+    qemu_vfree(tpmppi->buf);
+    tpmppi->buf = NULL;
+}
diff --git a/hw/tpm/tpm_ppi.h b/hw/tpm/tpm_ppi.h
index 88f316ee95..c173889033 100644
--- a/hw/tpm/tpm_ppi.h
+++ b/hw/tpm/tpm_ppi.h
@@ -32,6 +32,16 @@ typedef struct TPMPPI {
 void tpm_ppi_init(TPMPPI *tpmppi, MemoryRegion *m,
                   hwaddr addr, Object *obj);
 
+/**
+ * tpm_ppi_uninit:
+ * @tpmppi: a TPMPPI
+ * @m: the address-space / MemoryRegion to use
+ * @obj: the owner object
+ *
+ * Function to unregister the TPM PPI region.
+ */
+void tpm_ppi_uninit(TPMPPI *tpmppi, MemoryRegion *m, Object *obj);
+
 /**
  * tpm_ppi_reset:
  * @tpmppi: a TPMPPI
-- 
2.55.0