[Xen-devel] [PATCH] increase initial memory reservation for stubdom based HVM domains

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Hi all,
this patch requests 32 additional MB of free RAM from dom0 when an HVM
domain is started, if the device model for the domain is provided by a
stubdom.
This way there is no risk that a stubdom fails to populate the videoram
because the RAM freed for the videoram by dom0 has already been used to
create the stubdom.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

diff -r 10a8fae412c5 tools/python/xen/xend/image.py
--- a/tools/python/xen/xend/image.py    Wed Jan 14 13:43:17 2009 +0000
+++ b/tools/python/xen/xend/image.py    Thu Jan 15 16:33:26 2009 +0000
@@ -838,6 +838,7 @@
         HVMImageHandler.configure(self, vmConfig)
         self.vhpt = int(vmConfig['platform'].get('vhpt',  0))
         self.vramsize = int(vmConfig['platform'].get('videoram',4)) * 1024
+        self.use_stubdom = 
(vmConfig['platform'].get('device_model').find('stubdom-dm') >= 0)
 
     def buildDomain(self):
         xc.nvram_init(self.vm.getName(), self.vm.getDomid())
@@ -853,6 +854,8 @@
         extra_pages = 1024 + 5
         mem_kb += extra_pages * page_kb
         mem_kb += self.vramsize
+        if self.use_stubdom :
+            mem_kb += 32 * 1024 
         return mem_kb
 
     def getRequiredInitialReservation(self):
@@ -888,6 +891,7 @@
         HVMImageHandler.configure(self, vmConfig)
         self.pae = int(vmConfig['platform'].get('pae',  0))
         self.vramsize = int(vmConfig['platform'].get('videoram',4)) * 1024
+        self.use_stubdom = 
(vmConfig['platform'].get('device_model').find('stubdom-dm') >= 0)
 
     def buildDomain(self):
         xc.hvm_set_param(self.vm.getDomid(), HVM_PARAM_PAE_ENABLED, self.pae)
@@ -896,7 +900,10 @@
         return rc
 
     def getRequiredAvailableMemory(self, mem_kb):
-        return mem_kb + self.vramsize
+        mem_kb += self.vramsize
+        if self.use_stubdom :
+            mem_kb += 32 * 1024
+        return mem_kb
 
     def getRequiredInitialReservation(self):
         return self.vm.getMemoryTarget()

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