[PACTH v3 3/5] tpm_spapr: Support suspend and resume

[Stefan Berger]

Extend the tpm_spapr frontend with VM suspend and resume support.

Signed-off-by: Stefan Berger <address@hidden>
---
 hw/tpm/tpm_spapr.c | 42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/hw/tpm/tpm_spapr.c b/hw/tpm/tpm_spapr.c
index c4a67e2403..d9153bd95c 100644
--- a/hw/tpm/tpm_spapr.c
+++ b/hw/tpm/tpm_spapr.c
@@ -87,6 +87,8 @@ typedef struct {
     TPMVersion be_tpm_version;
 
     size_t be_buffer_size;
+
+    bool deliver_response; /* whether to deliver response after VM resume */
 } SPAPRvTPMState;
 
 static void tpm_spapr_show_buffer(const unsigned char *buffer,
@@ -339,9 +341,47 @@ static enum TPMVersion tpm_spapr_get_version(TPMIf *ti)
     return tpm_backend_get_tpm_version(s->be_driver);
 }
 
+/* persistent state handling */
+
+static int tpm_spapr_pre_save(void *opaque)
+{
+    SPAPRvTPMState *s = opaque;
+
+    s->deliver_response = tpm_backend_finish_sync(s->be_driver);
+    /*
+     * we cannot deliver the results to the VM since DMA would touch VM memory
+     */
+
+    return 0;
+}
+
+static int tpm_spapr_post_load(void *opaque, int version_id)
+{
+    SPAPRvTPMState *s = opaque;
+
+    if (s->deliver_response) {
+        /* deliver the results to the VM via DMA */
+        tpm_spapr_request_completed(TPM_IF(s), 0);
+    }
+
+    return 0;
+}
+
 static const VMStateDescription vmstate_spapr_vtpm = {
     .name = "tpm-spapr",
-    .unmigratable = 1,
+    .version_id = 1,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .pre_save = tpm_spapr_pre_save,
+    .post_load = tpm_spapr_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_SPAPR_VIO(vdev, SPAPRvTPMState),
+
+        VMSTATE_UINT8(state, SPAPRvTPMState),
+        VMSTATE_BUFFER(buffer, SPAPRvTPMState),
+        VMSTATE_BOOL(deliver_response, SPAPRvTPMState),
+        VMSTATE_END_OF_LIST(),
+    }
 };
 
 static Property tpm_spapr_properties[] = {
-- 
2.21.0