From: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Date: Fri, 29 Jan 2021 16:46:21 +0000 (-0500)
Subject: multi-process: perform device reset in the remote process
X-Git-Tag: v6.0.0-rc0~94^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b6cc02d98fc6df49786608e5916f3de883a9461c;p=thirdparty%2Fqemu.git

multi-process: perform device reset in the remote process

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.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 7cb220a51f565dc0817bd76e2f540e89c2d2b850.1611938319.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---

diff --git a/hw/remote/message.c b/hw/remote/message.c
index adab040ca1e..11d729845c5 100644
--- a/hw/remote/message.c
+++ b/hw/remote/message.c
@@ -19,6 +19,7 @@
 #include "exec/memattrs.h"
 #include "hw/remote/memory.h"
 #include "hw/remote/iohub.h"
+#include "sysemu/reset.h"
 
 static void process_config_write(QIOChannel *ioc, PCIDevice *dev,
                                  MPQemuMsg *msg, Error **errp);
@@ -26,6 +27,8 @@ static void process_config_read(QIOChannel *ioc, PCIDevice *dev,
                                 MPQemuMsg *msg, Error **errp);
 static void process_bar_write(QIOChannel *ioc, MPQemuMsg *msg, Error **errp);
 static void process_bar_read(QIOChannel *ioc, MPQemuMsg *msg, Error **errp);
+static void process_device_reset_msg(QIOChannel *ioc, PCIDevice *dev,
+                                     Error **errp);
 
 void coroutine_fn mpqemu_remote_msg_loop_co(void *data)
 {
@@ -69,6 +72,9 @@ void coroutine_fn mpqemu_remote_msg_loop_co(void *data)
         case MPQEMU_CMD_SET_IRQFD:
             process_set_irqfd_msg(pci_dev, &msg);
             break;
+        case MPQEMU_CMD_DEVICE_RESET:
+            process_device_reset_msg(com->ioc, pci_dev, &local_err);
+            break;
         default:
             error_setg(&local_err,
                        "Unknown command (%d) received for device %s"
@@ -206,3 +212,19 @@ fail:
                       getpid());
     }
 }
+
+static void process_device_reset_msg(QIOChannel *ioc, PCIDevice *dev,
+                                     Error **errp)
+{
+    DeviceClass *dc = DEVICE_GET_CLASS(dev);
+    DeviceState *s = DEVICE(dev);
+    MPQemuMsg ret = { 0 };
+
+    if (dc->reset) {
+        dc->reset(s);
+    }
+
+    ret.cmd = MPQEMU_CMD_RET;
+
+    mpqemu_msg_send(&ret, ioc, errp);
+}
diff --git a/hw/remote/proxy.c b/hw/remote/proxy.c
index a082709881a..4fa4be079d7 100644
--- a/hw/remote/proxy.c
+++ b/hw/remote/proxy.c
@@ -26,6 +26,7 @@
 #include "util/event_notifier-posix.c"
 
 static void probe_pci_info(PCIDevice *dev, Error **errp);
+static void proxy_device_reset(DeviceState *dev);
 
 static void proxy_intx_update(PCIDevice *pci_dev)
 {
@@ -202,6 +203,8 @@ static void pci_proxy_dev_class_init(ObjectClass *klass, void *data)
     k->config_read = pci_proxy_read_config;
     k->config_write = pci_proxy_write_config;
 
+    dc->reset = proxy_device_reset;
+
     device_class_set_props(dc, proxy_properties);
 }
 
@@ -358,3 +361,19 @@ static void probe_pci_info(PCIDevice *dev, Error **errp)
         }
     }
 }
+
+static void proxy_device_reset(DeviceState *dev)
+{
+    PCIProxyDev *pdev = PCI_PROXY_DEV(dev);
+    MPQemuMsg msg = { 0 };
+    Error *local_err = NULL;
+
+    msg.cmd = MPQEMU_CMD_DEVICE_RESET;
+    msg.size = 0;
+
+    mpqemu_msg_send_and_await_reply(&msg, pdev, &local_err);
+    if (local_err) {
+        error_report_err(local_err);
+    }
+
+}
diff --git a/include/hw/remote/mpqemu-link.h b/include/hw/remote/mpqemu-link.h
index 71d206f00e1..4ec09158851 100644
--- a/include/hw/remote/mpqemu-link.h
+++ b/include/hw/remote/mpqemu-link.h
@@ -40,6 +40,7 @@ typedef enum {
     MPQEMU_CMD_BAR_WRITE,
     MPQEMU_CMD_BAR_READ,
     MPQEMU_CMD_SET_IRQFD,
+    MPQEMU_CMD_DEVICE_RESET,
     MPQEMU_CMD_MAX,
 } MPQemuCmd;