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Commit fb1d8404 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Jeremy Fitzhardinge
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xen: ask the hypervisor how much space it needs reserved 



Ask the hypervisor how much space it needs reserved, since 32-on-64
doesn't need any space, and it may change in future.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
parent 74260714

arch/x86/xen/enlighten.c

+12 −1
Original line number Diff line number Diff line
@@ -1112,6 +1112,17 @@ static const struct machine_ops __initdata xen_machine_ops = { 
};





static void __init xen_reserve_top(void)

{

	unsigned long top = HYPERVISOR_VIRT_START;

	struct xen_platform_parameters pp;



	if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)

		top = pp.virt_start;



	reserve_top_address(-top + 2 * PAGE_SIZE);

}



/* First C function to be called on Xen boot */

asmlinkage void __init xen_start_kernel(void)

{
@@ -1169,7 +1180,7 @@ asmlinkage void __init xen_start_kernel(void) 
		pv_info.kernel_rpl = 0;



	/* set the limit of our address space */

	reserve_top_address(-HYPERVISOR_VIRT_START + 2 * PAGE_SIZE);

	xen_reserve_top();



	/* set up basic CPUID stuff */

	cpu_detect(&new_cpu_data);