[Xen-devel] [PATCH 17/17] tools: nest: allow enabling nesting

[Qing He <qing.he@xxxxxxxxx>]

Add hvm config option to allow nesting

Signed-off-by: Qing He <qing.he@xxxxxxxxx>

---
 examples/xmexample.hvm            |   12 ++++++++++++
 python/xen/xend/XendConfig.py     |    4 ++++
 python/xen/xend/XendDomainInfo.py |    5 ++++-
 python/xen/xm/create.py           |    7 ++++++-
 python/xen/xm/xenapi_create.py    |    1 +
 5 files changed, 27 insertions(+), 2 deletions(-)

diff -r 3a7b55a0be9c -r 682f3d39f719 tools/examples/xmexample.hvm
--- a/tools/examples/xmexample.hvm      Thu Apr 22 22:30:10 2010 +0800
+++ b/tools/examples/xmexample.hvm      Thu Apr 22 22:39:56 2010 +0800
@@ -371,3 +371,15 @@
 #
 
 #vscsi = [ '/dev/sdx, 0:0:0:0' ]
+
+#   Enable nested virtualization
+#
+#   Turn on this option allow the guest to present virtualization
+# hardware. So that guest can use VMX or SVM to run another guest.
+# Turning off the option not only masks availability reporting, but
+# also disables all related controls, including related instructions,
+# cpuid, msr, etc. for security concerns.
+#
+# This feature is experimental, and the default is off.
+#
+#nesting=0
diff -r 3a7b55a0be9c -r 682f3d39f719 tools/python/xen/xend/XendConfig.py
--- a/tools/python/xen/xend/XendConfig.py       Thu Apr 22 22:30:10 2010 +0800
+++ b/tools/python/xen/xend/XendConfig.py       Thu Apr 22 22:39:56 2010 +0800
@@ -176,6 +176,7 @@
     'vhpt': int,
     'guest_os_type': str,
     'hap': int,
+    'nesting': int,
     'xen_extended_power_mgmt': int,
     'pci_msitranslate': int,
     'pci_power_mgmt': int,
@@ -2219,6 +2220,9 @@
     def is_hap(self):
         return self['platform'].get('hap', 0)
 
+    def is_nesting(self):
+        return self['platform'].get('nesting', 0)
+
     def is_pv_and_has_pci(self):
         for dev_type, dev_info in self.all_devices_sxpr():
             if dev_type != 'pci':
diff -r 3a7b55a0be9c -r 682f3d39f719 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py   Thu Apr 22 22:30:10 2010 +0800
+++ b/tools/python/xen/xend/XendDomainInfo.py   Thu Apr 22 22:39:56 2010 +0800
@@ -2511,9 +2511,11 @@
         self.restart_in_progress = False
 
         hap = 0
+        nesting = 0
         hvm = self.info.is_hvm()
         if hvm:
             hap = self.info.is_hap()
+            nesting = self.info.is_nesting()
             info = xc.xeninfo()
             if 'hvm' not in info['xen_caps']:
                 raise VmError("HVM guest support is unavailable: is VT/AMD-V "
@@ -2540,7 +2542,8 @@
         oos = self.info['platform'].get('oos', 1)
         oos_off = 1 - int(oos)
 
-        flags = (int(hvm) << 0) | (int(hap) << 1) | (int(s3_integrity) << 2) | 
(int(oos_off) << 3)
+        flags = (int(hvm) << 0) | (int(hap) << 1) | (int(s3_integrity) << 2) \
+              | (int(oos_off) << 3) | (int(nesting) << 4)
 
         try:
             self.domid = xc.domain_create(
diff -r 3a7b55a0be9c -r 682f3d39f719 tools/python/xen/xm/create.py
--- a/tools/python/xen/xm/create.py     Thu Apr 22 22:30:10 2010 +0800
+++ b/tools/python/xen/xm/create.py     Thu Apr 22 22:39:56 2010 +0800
@@ -643,6 +643,11 @@
           use="""Should out-of-sync shadow page tabled be enabled?
           (0=OOS is disabled; 1=OOS is enabled.""")
 
+gopts.var('nesting', val='Nesting',
+          fn=set_int, default=0,
+          use="""Nesting availability (0=nesting is forbidden;
+          1=nesting is allowed.""")
+
 gopts.var('cpuid', val="IN[,SIN]:eax=EAX,ebx=EBX,ecx=ECX,edx=EDX",
           fn=append_value, default=[],
           use="""Cpuid description.""")
@@ -1065,7 +1070,7 @@
              'device_model', 'display',
              'fda', 'fdb',
              'gfx_passthru', 'guest_os_type',
-             'hap', 'hpet',
+             'hap', 'hpet', 'nesting',
              'isa',
              'keymap',
              'localtime',
diff -r 3a7b55a0be9c -r 682f3d39f719 tools/python/xen/xm/xenapi_create.py
--- a/tools/python/xen/xm/xenapi_create.py      Thu Apr 22 22:30:10 2010 +0800
+++ b/tools/python/xen/xm/xenapi_create.py      Thu Apr 22 22:39:56 2010 +0800
@@ -1105,6 +1105,7 @@
             'guest_os_type',
             'hap',
             'oos',
+            'nesting',
             'pci_msitranslate',
             'pci_power_mgmt',
             'xen_platform_pci',

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