* Zachary Amsden ([email protected]) wrote:
> Allow compile time creation of a hole at the high end of linear address space.
> This makes accomodating a hypervisor a much more tractable problem by giving
> it ample playground to live in. Currently, the hole size is fixed at config
> time; I have experimented with dynamically sized holes, and have a later
> patch that developes this potential, but it becomes much more useful once
> the exact negotiation of linear address space with the hypervisor is defined.
>
> The fixed compile time solution is sufficient for now.
Xen moves __FIXADDR_TOP like this:
#ifdef CONFIG_X86_PAE
# define HYPERVISOR_VIRT_START (0xF5800000UL)
#else
# define HYPERVISOR_VIRT_START (0xFC000000UL)
#endif
and
#define __FIXADDR_TOP (HYPERVISOR_VIRT_START - 2 * PAGE_SIZE)
and also adds bits to fixmap.
So this proposed mechanism isn't quite good enough.
thanks,
-chris
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