[Qemu-devel] [RFC v3 PATCH 43/45] multi-process: prevent duplicate memory initialization in remote

[Jagannathan Raman <jag.raman@oracle.com>]

When multiple controllers are configured in a remote process,
it's better for the memory to be managed by only one of the proxy
objects for that process, in order to conserve file descriptors. Added
"mem_int" flag for this purpose.

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>
---
 New patch in v3

 hw/proxy/qemu-proxy.c         | 13 ++++++++++++-
 include/hw/proxy/qemu-proxy.h |  1 +
 qdev-monitor.c                |  2 +-
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/hw/proxy/qemu-proxy.c b/hw/proxy/qemu-proxy.c
index c812145..8b820cf 100644
--- a/hw/proxy/qemu-proxy.c
+++ b/hw/proxy/qemu-proxy.c
@@ -363,6 +363,13 @@ static void pci_proxy_write_config(PCIDevice *d, uint32_t addr, uint32_t val,
                    PCI_PROXY_DEV(d)->dev_id, CONF_WRITE);
 }
 
+static void pci_proxy_dev_inst_init(Object *obj)
+{
+    PCIProxyDev *dev = PCI_PROXY_DEV(obj);
+
+    dev->mem_init = false;
+}
+
 static void pci_proxy_dev_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
@@ -377,6 +384,7 @@ static const TypeInfo pci_proxy_dev_type_info = {
     .name          = TYPE_PCI_PROXY_DEV,
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PCIProxyDev),
+    .instance_init = pci_proxy_dev_inst_init,
     .abstract      = true,
     .class_size    = sizeof(PCIProxyDevClass),
     .class_init    = pci_proxy_dev_class_init,
@@ -483,7 +491,10 @@ static void init_proxy(PCIDevice *dev, char *command, bool need_spawn, Error **e
     proxy_link_init_channel(pdev->proxy_link, &pdev->proxy_link->mmio,
                             pdev->mmio_sock);
 
-    configure_memory_sync(pdev->sync, pdev->proxy_link);
+    if (!pdev->mem_init) {
+        pdev->mem_init = true;
+        configure_memory_sync(pdev->sync, pdev->proxy_link);
+    }
 }
 
 static void pci_proxy_dev_realize(PCIDevice *device, Error **errp)
diff --git a/include/hw/proxy/qemu-proxy.h b/include/hw/proxy/qemu-proxy.h
index d88fbd4..610695f 100644
--- a/include/hw/proxy/qemu-proxy.h
+++ b/include/hw/proxy/qemu-proxy.h
@@ -51,6 +51,7 @@ typedef struct PCIProxyDev {
     ProxyLinkState *proxy_link;
 
     RemoteMemSync *sync;
+    bool mem_init;
     struct kvm_irqfd irqfd;
 
     EventNotifier intr;
diff --git a/qdev-monitor.c b/qdev-monitor.c
index f1065af..3b08e23 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -712,10 +712,10 @@ DeviceState *qdev_proxy_add(const char *rid, const char *id, char *bus,
         pdev->socket = old_pdev->socket;
         pdev->mmio_sock = old_pdev->mmio_sock;
         pdev->remote_pid = old_pdev->remote_pid;
+        pdev->mem_init = true;
     } else {
         pdev->rsocket = managed ? rsocket : -1;
         pdev->socket = managed ? rsocket : -1;
-
     }
     pdev->managed = managed;
 
-- 
1.8.3.1