xen: add configurable max domain size
Add a config option to set the max size of a Xen domain. This is used
to scale the size of the physical-to-machine array; it ends up using
around 1 page/GByte, so there's no reason to be very restrictive.
For a 32-bit guest, the default value of 8GB is probably sufficient;
there's not much point in giving a 32-bit machine much more memory
than that.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 525b108..d0f1c7c 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -11,3 +11,13 @@
This is the Linux Xen port. Enabling this will allow the
kernel to boot in a paravirtualized environment under the
Xen hypervisor.
+
+config XEN_MAX_DOMAIN_MEMORY
+ int "Maximum allowed size of a domain in gigabytes"
+ default 8
+ depends on XEN
+ help
+ The pseudo-physical to machine address array is sized
+ according to the maximum possible memory size of a Xen
+ domain. This array uses 1 page per gigabyte, so there's no
+ need to be too stingy here.
\ No newline at end of file