[PATCH RESEND v6 30/36] multi-process: perform device reset in the remote process

[elena . ufimtseva]

From: Elena Ufimtseva <elena.ufimts...@oracle.com>

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 <elena.ufimts...@oracle.com>
Signed-off-by: John G Johnson <john.g.john...@oracle.com>
Signed-off-by: Jagannathan Raman <jag.ra...@oracle.com>
---
 hw/proxy/qemu-proxy.c    | 25 +++++++++++++++++++++++++
 include/io/mpqemu-link.h |  1 +
 remote/remote-main.c     | 13 +++++++++++++
 3 files changed, 39 insertions(+)

diff --git a/hw/proxy/qemu-proxy.c b/hw/proxy/qemu-proxy.c
index 162014353f..cffc227acd 100644
--- a/hw/proxy/qemu-proxy.c
+++ b/hw/proxy/qemu-proxy.c
@@ -291,14 +291,39 @@ static void pci_proxy_dev_exit(PCIDevice *pdev)
     stop_hb_timer(dev);
 }
 
+static void proxy_device_reset(DeviceState *dev)
+{
+    PCIProxyDev *pdev = PCI_PROXY_DEV(dev);
+    MPQemuMsg msg;
+    int wait = -1;
+
+    memset(&msg, 0, sizeof(MPQemuMsg));
+
+    msg.bytestream = 0;
+    msg.size = sizeof(msg.data1);
+    msg.cmd = DEVICE_RESET;
+
+    wait = GET_REMOTE_WAIT;
+    msg.num_fds = 1;
+    msg.fds[0] = wait;
+
+    mpqemu_msg_send(&msg, pdev->mpqemu_link->com);
+
+    (void)wait_for_remote(wait);
+
+    PUT_REMOTE_WAIT(wait);
+}
+
 static void pci_proxy_dev_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
 
     k->realize = pci_proxy_dev_realize;
     k->exit = pci_proxy_dev_exit;
     k->config_read = pci_proxy_read_config;
     k->config_write = pci_proxy_write_config;
+    dc->reset = proxy_device_reset;
 }
 
 static const TypeInfo pci_proxy_dev_type_info = {
diff --git a/include/io/mpqemu-link.h b/include/io/mpqemu-link.h
index 45ea1fcafa..22fb234744 100644
--- a/include/io/mpqemu-link.h
+++ b/include/io/mpqemu-link.h
@@ -51,6 +51,7 @@ typedef enum {
     GET_PCI_INFO,
     RET_PCI_INFO,
     PROXY_PING,
+    DEVICE_RESET,
     MAX,
 } mpqemu_cmd_t;
 
diff --git a/remote/remote-main.c b/remote/remote-main.c
index beac591fac..562db4ccc3 100644
--- a/remote/remote-main.c
+++ b/remote/remote-main.c
@@ -39,6 +39,7 @@
 #include "exec/address-spaces.h"
 #include "remote/iohub.h"
 #include "remote-opts.h"
+#include "sysemu/reset.h"
 
 static void process_msg(GIOCondition cond, MPQemuLinkState *link,
                         MPQemuChannel *chan);
@@ -208,6 +209,15 @@ static void process_get_pci_info_msg(MPQemuLinkState 
*link, MPQemuMsg *msg)
     mpqemu_msg_send(&ret, link->dev);
 }
 
+static void process_device_reset_msg(MPQemuMsg *msg)
+{
+    qemu_devices_reset();
+
+    if (msg->num_fds == 1) {
+            notify_proxy(msg->fds[0], 0);
+    }
+}
+
 static void process_msg(GIOCondition cond, MPQemuLinkState *link,
                         MPQemuChannel *chan)
 {
@@ -274,6 +284,9 @@ static void process_msg(GIOCondition cond, MPQemuLinkState 
*link,
         wait = msg->fds[0];
         notify_proxy(wait, 0);
         break;
+    case DEVICE_RESET:
+        process_device_reset_msg(msg);
+        break;
     default:
         error_setg(&err, "Unknown command in %s", print_pid_exec(pid_exec));
         goto finalize_loop;
-- 
2.25.GIT