details: Add new checkbox to control shared memory access

The virtiofs in domcapabilities is used as a proxy to tell us whether
libvirt is new enough to allow bare memory access mode=shared', So We
enable/disable this checkbox according to it.

When we configure shared memory access, If the 'memfd' is available in
domcaps, We configure VM to use it as memory backend because it doesn't
need addtional host setup for vhost-user devices, Otherwise use 'file'
as backend.

If all of numa nodes explicitly defined memAccess=shared, We mark this
checkbox as checked even if virtiofs isn't exposed in domcapabilities.
In this case:
- It doesn't matter what the value of access mode of memoryBacking is
  because access mode of memoryBacking will be overridden per numa node
  by memAccess attribute.
- Although the checkbox is disabled, the checked checkbox presents actual
  status about shared memory access to users.

Signed-off-by: Lin Ma <lma@suse.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/virtManager/object/domain.py b/virtManager/object/domain.py
index 00c990fd..f2d67e95 100644
--- a/virtManager/object/domain.py
+++ b/virtManager/object/domain.py
@@ -626,7 +626,8 @@ class vmmDomain(vmmLibvirtObject):
 
     def define_cpu(self, vcpus=_SENTINEL,
             model=_SENTINEL, secure=_SENTINEL, sockets=_SENTINEL,
-            cores=_SENTINEL, threads=_SENTINEL, clear_topology=_SENTINEL):
+            cores=_SENTINEL, threads=_SENTINEL, memAccess=_SENTINEL,
+            clear_topology=_SENTINEL):
         guest = self._make_xmlobj_to_define()
 
         if vcpus != _SENTINEL:
@@ -646,6 +647,11 @@ class vmmDomain(vmmLibvirtObject):
                 guest.cpu.set_special_mode(guest, model)
             else:
                 guest.cpu.set_model(guest, model)
+
+        if memAccess != _SENTINEL:
+            for cell in guest.cpu.cells:
+                cell.memAccess = memAccess
+
         self._redefine_xmlobj(guest)
 
     def define_memory(self, memory=_SENTINEL, maxmem=_SENTINEL):
@@ -657,6 +663,15 @@ class vmmDomain(vmmLibvirtObject):
             guest.memory = int(maxmem)
         self._redefine_xmlobj(guest)
 
+    def define_memorybacking(self, source_type=_SENTINEL, access_mode=_SENTINEL):
+        guest = self._make_xmlobj_to_define()
+
+        if source_type != _SENTINEL:
+            guest.memoryBacking.source_type = source_type
+        if access_mode != _SENTINEL:
+            guest.memoryBacking.access_mode = access_mode
+        self._redefine_xmlobj(guest)
+
     def define_overview(self, machine=_SENTINEL, description=_SENTINEL,
             title=_SENTINEL, loader=_SENTINEL,
             nvram=_SENTINEL):