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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] architecture-specific stuff in xend
On Mon, 2006-08-14 at 12:40 -0500, Hollis Blanchard wrote:
> Here is the update. Special thanks to Dan Stekloff and Daniel Miles, who
> tested on HVM and IA64, respectively.
...
> @@ -349,20 +340,8 @@ class HVMImageHandler(ImageHandler):
> os.waitpid(self.pid, 0)
> self.pid = 0
>
> - def getDomainMemory(self, mem_kb):
> - """@see ImageHandler.getDomainMemory"""
> - if os.uname()[4] == 'ia64':
> - page_kb = 16
> - # ROM size for guest firmware, ioreq page and xenstore page
> - extra_pages = 1024 + 2
> - else:
> - page_kb = 4
> - # This was derived emperically:
> - # 2.4 MB overhead per 1024 MB RAM + 8 MB constant
> - # + 4 to avoid low-memory condition
> - extra_mb = (2.4/1024) * (mem_kb/1024.0) + 12;
> - extra_pages = int( math.ceil( extra_mb*1024 / page_kb ))
> - return mem_kb + extra_pages * page_kb
> + def getRequiredMemory(self, domain_kb):
> + return arch.HVMRequiredMemory(domain_kb)
>
> def register_shutdown_watch(self):
> """ add xen store watch on control/shutdown """
I'm actually not sure about this approach now. getRequiredMemory() could
more naturally be implemented in an ia64- or x86-specific HVM subclass.
Here is a totally untested patch illustrating the idea:
diff -r 8cca42e2610a tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py Thu Aug 10 14:29:04 2006 +0100
+++ b/tools/python/xen/xend/XendDomainInfo.py Mon Aug 14 19:57:38 2006 -0500
@@ -1279,23 +1279,14 @@ class XendDomainInfo:
cpu = [ int( cpus[v % len(cpus)] ) ]
xc.vcpu_setaffinity(self.domid, v, cpu)
- # set domain maxmem in KiB
- xc.domain_setmaxmem(self.domid, self.info['maxmem'] * 1024)
-
- m = self.image.getDomainMemory(self.info['memory'] * 1024)
- balloon.free(m)
-
- init_reservation = self.info['memory'] * 1024
- if os.uname()[4] in ('ia64', 'ppc64'):
- # Workaround for architectures that don't yet support
- # ballooning.
- init_reservation = m
- # Following line from xiantao.zhang@xxxxxxxxx
- # Needed for IA64 until supports ballooning -- okay for PPC64?
- xc.domain_setmaxmem(self.domid, m)
-
- xc.domain_memory_increase_reservation(self.domid, init_reservation,
- 0, 0)
+ # set memory limit
+ maxmem = self.image.getRequiredMemory(self.info['maxmem'] * 1024)
+ xc.domain_setmaxmem(self.domid, maxmem)
+
+ # initial memory allocation
+ mem_kb = self.image.getRequiredMemory(self.info['memory'] * 1024)
+ balloon.free(mem_kb)
+ xc.domain_memory_increase_reservation(self.domid, mem_kb, 0, 0)
self.createChannels()
diff -r 8cca42e2610a tools/python/xen/xend/image.py
--- a/tools/python/xen/xend/image.py Thu Aug 10 14:29:04 2006 +0100
+++ b/tools/python/xen/xend/image.py Mon Aug 14 20:52:55 2006 -0500
@@ -27,6 +27,7 @@ from xen.xend.XendLogging import log
from xen.xend.XendLogging import log
from xen.xend.server.netif import randomMAC
from xen.xend.xenstore.xswatch import xswatch
+from xen.xend import arch
xc = xen.lowlevel.xc.xc()
@@ -141,17 +142,8 @@ class ImageHandler:
raise VmError('Building domain failed: ostype=%s dom=%d err=%s'
% (self.ostype, self.vm.getDomid(), str(result)))
-
- def getDomainMemory(self, mem_kb):
- """@return The memory required, in KiB, by the domain to store the
- given amount, also in KiB."""
- if os.uname()[4] != 'ia64':
- # A little extra because auto-ballooning is broken w.r.t. HVM
- # guests. Also, slack is necessary for live migration since that
- # uses shadow page tables.
- if 'hvm' in xc.xeninfo()['xen_caps']:
- mem_kb += 4*1024;
- return mem_kb
+ def getRequiredMemory(self, domain_kb):
+ return domain_kb
def buildDomain(self):
"""Build the domain. Define in subclass."""
@@ -192,8 +184,6 @@ class LinuxImageHandler(ImageHandler):
features = self.vm.getFeatures())
class HVMImageHandler(ImageHandler):
-
- ostype = "hvm"
def configure(self, imageConfig, deviceConfig):
ImageHandler.configure(self, imageConfig, deviceConfig)
@@ -349,21 +339,6 @@ class HVMImageHandler(ImageHandler):
os.waitpid(self.pid, 0)
self.pid = 0
- def getDomainMemory(self, mem_kb):
- """@see ImageHandler.getDomainMemory"""
- if os.uname()[4] == 'ia64':
- page_kb = 16
- # ROM size for guest firmware, ioreq page and xenstore page
- extra_pages = 1024 + 2
- else:
- page_kb = 4
- # This was derived emperically:
- # 2.4 MB overhead per 1024 MB RAM + 8 MB constant
- # + 4 to avoid low-memory condition
- extra_mb = (2.4/1024) * (mem_kb/1024.0) + 12;
- extra_pages = int( math.ceil( extra_mb*1024 / page_kb ))
- return mem_kb + extra_pages * page_kb
-
def register_shutdown_watch(self):
""" add xen store watch on control/shutdown """
self.shutdownWatch = xswatch(self.vm.dompath + "/control/shutdown", \
@@ -400,15 +375,42 @@ class HVMImageHandler(ImageHandler):
return 1 # Keep watching
-"""Table of image handler classes for virtual machine images. Indexed by
-image type.
-"""
-imageHandlerClasses = {}
-
-
-for h in LinuxImageHandler, HVMImageHandler:
- imageHandlerClasses[h.ostype] = h
-
+class IA64_HVM_ImageHandler(HVMImageHandler):
+
+ ostype = "hvm"
+
+ def getRequiredMemory(self):
+ page_kb = 16
+ # ROM size for guest firmware, ioreq page and xenstore page
+ extra_pages = 1024 + 2
+ return mem_kb + extra_pages * page_kb
+
+class X86_HVM_ImageHandler(HVMImageHandler):
+
+ ostype = "hvm"
+
+ def getRequiredMemory(self):
+ page_kb = 4
+ # This was derived emperically:
+ # 2.4 MB overhead per 1024 MB RAM + 8 MB constant
+ # + 4 to avoid low-memory condition
+ extra_mb = (2.4/1024) * (mem_kb/1024.0) + 12;
+ extra_pages = int( math.ceil( extra_mb*1024 / page_kb ))
+ return mem_kb + extra_pages * page_kb
+
+_handlers = {
+ "powerpc": {
+ "linux": LinuxImageHandler,
+ },
+ "ia64": {
+ "linux": LinuxImageHandler,
+ "hvm": IA64_HVM_ImageHandler,
+ }
+ "x86": {
+ "linux": LinuxImageHandler,
+ "hvm": X86_HVM_ImageHandler,
+ },
+}
def findImageHandlerClass(image):
"""Find the image handler class for an image config.
@@ -416,10 +418,10 @@ def findImageHandlerClass(image):
@param image config
@return ImageHandler subclass or None
"""
- ty = sxp.name(image)
- if ty is None:
+ type = sxp.name(image)
+ if type is None:
raise VmError('missing image type')
- imageClass = imageHandlerClasses.get(ty)
- if imageClass is None:
- raise VmError('unknown image type: ' + ty)
- return imageClass
+ try:
+ return _handlers[arch.type][type]
+ except KeyError:
+ raise VmError('unknown image type: ' + type)
diff -r 8cca42e2610a tools/python/xen/xend/arch.py
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/python/xen/xend/arch.py Mon Aug 14 20:45:42 2006 -0500
@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of version 2.1 of the GNU Lesser General Public
+# License as published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+# Copyright (C) IBM Corp. 2006
+#
+# Authors: Hollis Blanchard <hollisb@xxxxxxxxxx>
+
+import os
+
+_types = {
+ "i386": "x86",
+ "i486": "x86",
+ "i586": "x86",
+ "i686": "x86",
+ "ia64": "ia64",
+ "ppc": "powerpc",
+ "ppc64": "powerpc",
+}
+type = _types.get(os.uname()[4], "unknown")
Notice that findImageHandlerClass() had to change because we now have
two "hvm" handlers.
The PowerPC builder will layer on top of that patch:
diff -r acb9e95d892b tools/python/xen/xend/image.py
--- a/tools/python/xen/xend/image.py Mon Aug 14 20:53:11 2006 -0500
+++ b/tools/python/xen/xend/image.py Mon Aug 14 21:11:55 2006 -0500
@@ -28,6 +28,7 @@ from xen.xend.server.netif import random
from xen.xend.server.netif import randomMAC
from xen.xend.xenstore.xswatch import xswatch
from xen.xend import arch
+from xen.xend import FlatDeviceTree
xc = xen.lowlevel.xc.xc()
@@ -182,6 +183,38 @@ class LinuxImageHandler(ImageHandler):
cmdline = self.cmdline,
ramdisk = self.ramdisk,
features = self.vm.getFeatures())
+
+class PPC_LinuxImageHandler(LinuxImageHandler):
+
+ ostype = "linux"
+
+ def configure(self, imageConfig, deviceConfig):
+ LinuxImageHandler.__init__(self, imageConfig, deviceConfig)
+ self.imageConfig = imageConfig
+
+ def buildDomain(self):
+ store_evtchn = self.vm.getStorePort()
+ console_evtchn = self.vm.getConsolePort()
+
+ log.debug("dom = %d", self.vm.getDomid())
+ log.debug("image = %s", self.kernel)
+ log.debug("store_evtchn = %d", store_evtchn)
+ log.debug("console_evtchn = %d", console_evtchn)
+ log.debug("cmdline = %s", self.cmdline)
+ log.debug("ramdisk = %s", self.ramdisk)
+ log.debug("vcpus = %d", self.vm.getVCpuCount())
+ log.debug("features = %s", self.vm.getFeatures())
+
+ devtree = FlatDeviceTree.build(self.imageConfig)
+
+ return xc.linux_build(dom = self.vm.getDomid(),
+ image = self.kernel,
+ store_evtchn = store_evtchn,
+ console_evtchn = console_evtchn,
+ cmdline = self.cmdline,
+ ramdisk = self.ramdisk,
+ features = self.vm.getFeatures()
+ arch_args = devtree.to_bin())
class HVMImageHandler(ImageHandler):
@@ -400,7 +433,7 @@ class X86_HVM_ImageHandler(HVMImageHandl
_handlers = {
"powerpc": {
- "linux": LinuxImageHandler,
+ "linux": PPC_LinuxImageHandler,
},
"ia64": {
"linux": LinuxImageHandler,
PowerPC needs to convert 'imageConfig' into a special data structure, as
you can see here. (I haven't attached FlatDeviceTree.py because it's
large and irrelevant for now.) Also, the xc.linux_build() stuff is going
to be changed drastically per Keir's preference, but you get the idea:
PowerPC needs extra communication with libxc..
This approach would locate xend architecture-specific code wherever it's
used, rather than in an architecture-specific module. That could
probably be changed if desired, but I think it will require mastering
__import__().
Thoughts?
--
Hollis Blanchard
IBM Linux Technology Center
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