Host memory map in a Xen-enabled kernel

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Hi All,

I'm a complete n00b to Xen. I'm trying to figure out what the
user/kernel memory split is in a Xen-enabled kernel. In a non-Xen
kernel, PAGE_OFFSET tells me where the kernel virtual address space
starts, and TASK_SIZE tells me where the user virtual-address space
ends. When Xen is installed, does it modify the memory map of the host
kernel? If yes, what kernel symbols can I use to get these values, as
applicable to a user-space app running directly on a Xen-enabled
kernel (*not* in a guest OS).

Thanks for your help!
Mayank

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