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xen: ask the hypervisor how much space it needs reserved

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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: Jeremy Fitzhardinge <jeremy@xensource.com>
This commit is contained in:
Jeremy Fitzhardinge 2007-10-16 11:51:31 -07:00 committed by Jeremy Fitzhardinge
parent 74260714c5
commit fb1d84043c
1 changed files with 12 additions and 1 deletions
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13
arch/x86/xen/enlighten.c
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@ -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 */ /* First C function to be called on Xen boot */
asmlinkage void __init xen_start_kernel(void) asmlinkage void __init xen_start_kernel(void)
{ {
@ -1169,7 +1180,7 @@ asmlinkage void __init xen_start_kernel(void)
pv_info.kernel_rpl = 0; pv_info.kernel_rpl = 0;
/* set the limit of our address space */ /* set the limit of our address space */
reserve_top_address(-HYPERVISOR_VIRT_START + 2 * PAGE_SIZE); xen_reserve_top();
/* set up basic CPUID stuff */ /* set up basic CPUID stuff */
cpu_detect(&new_cpu_data); cpu_detect(&new_cpu_data);