[Qemu-devel] [RFC v3 PATCH 37/45] multi-process: perform device reset in the remote process

[Jagannathan Raman]

Perform device reset in the remote process when QEMU performs
device reset. This is required to reset the internal state
(like registers, etc...) of emulated devices

Signed-off-by: Elena Ufimtseva <address@hidden>
Signed-off-by: John G Johnson <address@hidden>
Signed-off-by: Jagannathan Raman <address@hidden>
---
 New patch in v3

 hw/proxy/proxy-lsi53c895a.c   |  6 ++++++
 hw/proxy/qemu-proxy.c         | 14 ++++++++++++++
 include/hw/proxy/qemu-proxy.h |  2 ++
 include/io/proxy-link.h       |  1 +
 remote/remote-main.c          | 11 +++++++++++
 5 files changed, 34 insertions(+)

diff --git a/hw/proxy/proxy-lsi53c895a.c b/hw/proxy/proxy-lsi53c895a.c
index e8a8d36..8640749 100644
--- a/hw/proxy/proxy-lsi53c895a.c
+++ b/hw/proxy/proxy-lsi53c895a.c
@@ -128,6 +128,11 @@ static void proxy_lsi_realize(PCIProxyDev *dev, Error 
**errp)
     pci_register_bar(pci_dev, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->ram_io);
 }
 
+static void proxy_lsi_reset(DeviceState *dev)
+{
+    proxy_device_reset(dev);
+}
+
 static void proxy_lsi_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -145,6 +150,7 @@ static void proxy_lsi_class_init(ObjectClass *klass, void 
*data)
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 
     dc->desc = "LSI Proxy Device";
+    dc->reset = proxy_lsi_reset;
 }
 
 static const TypeInfo lsi_proxy_dev_type_info = {
diff --git a/hw/proxy/qemu-proxy.c b/hw/proxy/qemu-proxy.c
index db9a208..c812145 100644
--- a/hw/proxy/qemu-proxy.c
+++ b/hw/proxy/qemu-proxy.c
@@ -588,3 +588,17 @@ uint64_t proxy_default_bar_read(PCIProxyDev *dev, 
MemoryRegion *mr, hwaddr addr,
 
     return val;
 }
+
+void proxy_device_reset(DeviceState *dev)
+{
+    PCIProxyDev *pdev = PCI_PROXY_DEV(dev);
+    ProcMsg msg;
+
+    memset(&msg, 0, sizeof(ProcMsg));
+
+    msg.bytestream = 0;
+    msg.size = sizeof(msg.data1);
+    msg.cmd = DEVICE_RESET;
+
+    proxy_proc_send(pdev->proxy_link, &msg, pdev->proxy_link->com);
+}
diff --git a/include/hw/proxy/qemu-proxy.h b/include/hw/proxy/qemu-proxy.h
index a03c6cc..d88fbd4 100644
--- a/include/hw/proxy/qemu-proxy.h
+++ b/include/hw/proxy/qemu-proxy.h
@@ -100,4 +100,6 @@ void proxy_default_bar_write(PCIProxyDev *dev, MemoryRegion 
*mr, hwaddr addr,
 uint64_t proxy_default_bar_read(PCIProxyDev *dev, MemoryRegion *mr, hwaddr 
addr,
                                 unsigned size, bool memory);
 
+void proxy_device_reset(DeviceState *dev);
+
 #endif /* QEMU_PROXY_H */
diff --git a/include/io/proxy-link.h b/include/io/proxy-link.h
index 32b2c1a..eb51d29 100644
--- a/include/io/proxy-link.h
+++ b/include/io/proxy-link.h
@@ -76,6 +76,7 @@ typedef enum {
     DEVICE_DEL,
     PROXY_PING,
     MMIO_RETURN,
+    DEVICE_RESET,
     MAX,
 } proc_cmd_t;
 
diff --git a/remote/remote-main.c b/remote/remote-main.c
index 2a9ebae..a6ff338 100644
--- a/remote/remote-main.c
+++ b/remote/remote-main.c
@@ -66,6 +66,9 @@
 #include "qemu/cutils.h"
 #include "remote-opts.h"
 
+#include "monitor/monitor.h"
+#include "sysemu/reset.h"
+
 static ProxyLinkState *proxy_link;
 
 typedef struct remote_pci_devs {
@@ -302,6 +305,11 @@ fail:
     del_from_pci_devs_list((const char *)msg->id);
 }
 
+static void process_device_reset_msg(ProcMsg *msg)
+{
+    qemu_devices_reset();
+}
+
 static int init_drive(QDict *rqdict, Error **errp)
 {
     QemuOpts *opts;
@@ -520,6 +528,9 @@ static void process_msg(GIOCondition cond, ProcChannel 
*chan)
         notify_proxy(wait, (uint32_t)getpid());
         PUT_REMOTE_WAIT(wait);
         break;
+    case DEVICE_RESET:
+        process_device_reset_msg(msg);
+        break;
     default:
         error_setg(&err, "Unknown command");
         goto finalize_loop;
-- 
1.8.3.1