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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: Jeremy Fitzhardinge <jeremy@xensource.com>
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1 changed files with 12 additions and 1 deletions
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@ -1112,6 +1112,17 @@ static const struct machine_ops __initdata xen_machine_ops = {
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};
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static void __init xen_reserve_top(void)
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{
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unsigned long top = HYPERVISOR_VIRT_START;
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struct xen_platform_parameters pp;
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if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
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top = pp.virt_start;
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reserve_top_address(-top + 2 * PAGE_SIZE);
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}
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/* First C function to be called on Xen boot */
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asmlinkage void __init xen_start_kernel(void)
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{
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@ -1169,7 +1180,7 @@ asmlinkage void __init xen_start_kernel(void)
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pv_info.kernel_rpl = 0;
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/* set the limit of our address space */
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reserve_top_address(-HYPERVISOR_VIRT_START + 2 * PAGE_SIZE);
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xen_reserve_top();
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/* set up basic CPUID stuff */
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cpu_detect(&new_cpu_data);
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