slight UML config simplification.

Since -tt mode is going to go the way of the dodo when -skas0 stabilizies (and -skas0 "works for me"), start making options that only affect -tt mode depend on -tt mode (and group them together).

Start with "nesting level".

Rob

@@ -63,6 +63,23 @@
 	chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
 	here.
 
+config NEST_LEVEL
+	int "Nesting level"
+	default "0"
+	depends on MODE_TT
+	help
+        This is set to the number of layers of UMLs that this UML will be run
+        in.  Normally, this is zero, meaning that it will run directly on the
+        host.  Setting it to one will build a UML that can run inside a UML
+        that is running on the host.  Generally, if you intend this UML to run
+        inside another UML, set CONFIG_NEST_LEVEL to one more than the host
+        UML.
+
+        Note that if the hosting UML has its CONFIG_KERNEL_HALF_GIGS set to
+        greater than one, then the guest UML should have its CONFIG_NEST_LEVEL
+        set to the host's CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS.
+        Only change this if you are running nested UMLs.
+
 config MODE_SKAS
 	bool "Separate Kernel Address Space support"
 	default y

@@ -223,22 +240,6 @@
 	depends on SMP
 	default "32"
 
-config NEST_LEVEL
-	int "Nesting level"
-	default "0"
-	help
-        This is set to the number of layers of UMLs that this UML will be run
-        in.  Normally, this is zero, meaning that it will run directly on the
-        host.  Setting it to one will build a UML that can run inside a UML
-        that is running on the host.  Generally, if you intend this UML to run
-        inside another UML, set CONFIG_NEST_LEVEL to one more than the host
-        UML.
-
-        Note that if the hosting UML has its CONFIG_KERNEL_HALF_GIGS set to
-        greater than one, then the guest UML should have its CONFIG_NEST_LEVEL
-        set to the host's CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS.
-        Only change this if you are running nested UMLs.
-
 config KERNEL_HALF_GIGS
 	int "Kernel address space size (in .5G units)"
 	default "1"

Applied, thanks. There's a bunch more that need similar treatment.

Jeff

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My limiting factor is learning what they are. :)

Rob

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Actually, I just took care of the rest of them.

Jeff

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Actually, NEST_LEVEL is needed for skas0 because of the stub pages. They need to be relocated in a nested UML. So, I'm dropping this patch.

BTW, the other config options which needed to be made dependent on MODE_TT now are.

Jeff

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Understood. Is there any way to autodetect this at runtime?

Rob

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I do not think it means what you think it means.


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Not sure, that would be nice.

It would have to look at its own maps and figure out that two pages mapped at the top of memory are the stub pages of the outer UML. That seems a bit ad-hoc to me.

Although maybe we could just say that any two pages there (as long as they are not stack) cause the stub pages to be relocated simply to avoid a collision. Here, we're not explicitly looking for an outer UML, just pages that we are about to stomp on.

Jeff

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